Different types of methods can be used for the preparation of Magnetic Nanoparticles, their advantages and disadvantages and applications of the materials in various fields are given in the presentation
Nanoparticles are solid colloidal particles ranging in size from 10 to 1000 nm.
Nanoparticles are made of a macromolecular material which can be of synthetic or natural origin.
the presentation gives brief description about magnetic nanoparticles, types of magnetic nanoparticles, magnetic nanocomposite and application of magnetic nanoparticles.
These slides use concepts from my (Jeff Funk) course entitled analyzing hi-tech opportunities to show how nanotechnology for drug deliver is becoming economically feasible.
Nanoparticles are defined as particulate dispersions or solid particles drug
carrier that may or may not be biodegradable. Several techniques are used for preparation of
nanoparticles like Solvent Evaporation, Double Emulsification method, Emulsions - Diffusion
Method, Nanoprecipitation, Coacervation method, Salting Out Method, Dialysis and
Supercritical fluid technology. Nanoparticles are subjected to several evaluation parameters
such as yield of nanoparticles, Drug Content / Surface entrapment / Drug entrapment, Particle
Size and Zeta Potential , Surface Morphology, Polydispersity index, In-vitro release Study,
Kinetic Study, Stability of nanoparticles
NANOTECHNOLOGY comprises technological developments on the nanometer scale, usually 0.1 to 100 nm. Nanotechnology, the science of the small. Nano is Greek for dwarf, and nanoscience deals with the study of molecular and atomic particles.
Different types of methods can be used for the preparation of Magnetic Nanoparticles, their advantages and disadvantages and applications of the materials in various fields are given in the presentation
Nanoparticles are solid colloidal particles ranging in size from 10 to 1000 nm.
Nanoparticles are made of a macromolecular material which can be of synthetic or natural origin.
the presentation gives brief description about magnetic nanoparticles, types of magnetic nanoparticles, magnetic nanocomposite and application of magnetic nanoparticles.
These slides use concepts from my (Jeff Funk) course entitled analyzing hi-tech opportunities to show how nanotechnology for drug deliver is becoming economically feasible.
Nanoparticles are defined as particulate dispersions or solid particles drug
carrier that may or may not be biodegradable. Several techniques are used for preparation of
nanoparticles like Solvent Evaporation, Double Emulsification method, Emulsions - Diffusion
Method, Nanoprecipitation, Coacervation method, Salting Out Method, Dialysis and
Supercritical fluid technology. Nanoparticles are subjected to several evaluation parameters
such as yield of nanoparticles, Drug Content / Surface entrapment / Drug entrapment, Particle
Size and Zeta Potential , Surface Morphology, Polydispersity index, In-vitro release Study,
Kinetic Study, Stability of nanoparticles
NANOTECHNOLOGY comprises technological developments on the nanometer scale, usually 0.1 to 100 nm. Nanotechnology, the science of the small. Nano is Greek for dwarf, and nanoscience deals with the study of molecular and atomic particles.
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
Acute scrotum is a general term referring to an emergency condition affecting the contents or the wall of the scrotum.
There are a number of conditions that present acutely, predominantly with pain and/or swelling
A careful and detailed history and examination, and in some cases, investigations allow differentiation between these diagnoses. A prompt diagnosis is essential as the patient may require urgent surgical intervention
Testicular torsion refers to twisting of the spermatic cord, causing ischaemia of the testicle.
Testicular torsion results from inadequate fixation of the testis to the tunica vaginalis producing ischemia from reduced arterial inflow and venous outflow obstruction.
The prevalence of testicular torsion in adult patients hospitalized with acute scrotal pain is approximately 25 to 50 percent
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
- ARTIFICIAL INTELLIGENCE AND ETHICS
- GENE THERAPY
- BEYOND BORDERS: GLOBAL INITIATIVES FOR DEMOCRATIZING LIFE SCIENCE TECHNOLOGIES AND PROMOTING ACCESS TO HEALTHCARE
- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
2. 1. Particle size
2. Zeta potential
3. Structure and crystallinity
4. Nanoparticle yield
5. Drug entrapment efficiency
6. In-vitro release
7. FDA Considerations For Regulation Of Nanomaterial Containing
Products
8. References
Evaluation of Nanoparticles :
3. SIZE & SHAPE ANALYSIS :
I. MICROSCOPIC TECHNIQUES :1
a. Optical microscopy : useful in evaluating particle > 1µm.
Limitation : Tedious and less resolution.
b. Electron microscopy: Particle shape and morphology is
determined.
• Have greater resolution(10A - 1µm).
• Aqueous samples do not survive high vacuum, hence
special techniques of sample preparation are necessary
prior to electron microscopy to prevent microstructure
changes.
4. i. Scanning electron microscopy (SEM) :
• Principle : SEM images the sample surface by scanning
with a high energy beam of electrons, under high
vacuum.
• Electrons interact with the atoms that make up the
sample producing signals that contain information about
surface topography, composition, electrical conductivity
etc.
• Procedure : Samples are coated with electrically
conductive materials like gold, platinum, osmium,
graphite etc.
• Coating prevents static electric charge accumulation on
specimen during electron irradiation.
5. Alternative to coating is to increase the bulk conductivity
by impregnation with osmium.
• Size range : 1-5nm in size.
• Disadvantages :
Sample must be dry.
Coating agent may change the morphology and size of the
particle.
Provides only 2D projection.
9. ii. Transmission electron microscopy (TEM) :
• Principle : Beam of electrons is transmitted through an
ultra thin specimen, interacting with specimen as it passes
through it.
• An image formed from electrons transmitted through it is
magnified and focused by objective lens.
Graphene, a carbon nanomaterial, one atom thick, is used
as platform.
It is transparent to electrons.
• TEM is of two types:
Negative stain TEM
Cryo – TEM
10. •Negative stain TEM : In this method, liposomes are embedded in
thin film of electron dense heavy metal stain.
• Negative stains used are ammonium molybdate, phosphotungstic
acid in case of liposomes composed of neutral or negatively
charged phospholipids.
• Uranyl acetate is used for positively charged lipids.
•
•Cryo -TEM : Sample can be viewed directly in TEM (at temp of -
196oC)
• Sufficient contrast is given to frozen sample by osmium
tetroxide.
• At such temperature, vapour pressure is low; hence, preservation
of microstructure is possible despite high vacuum.
• Disadvantages :
• Due to fluid property of dispersion, prior to freezing, thickness of
sample various from center (thin) to outside (thick film).
• Hence, actual size distribution cannot be known.
13. Coulter counter :
• In this technique , fine particles to be characterized are
placed in an electrolyte and a stream of suspension is
passed through an orifice between two electrodes.
• Size of fine particles is deduced from measured resistance
change between
electrodes.
• The resistance causes a voltage pulse, directly proportional
to particle volume of individual particle.
• When concentration is low, each voltage pulse corresponds
to an individual particle. Hence, size distribution can be
established.
14. Limitations :
Only particle size > 400 nm are detected.
Particles must be spherical for accurate
volume measurements.
Particles that are non-spherical or porous
will give volumes larger than their actual
volumes.
15. II. DIFFRACTION AND SCATTERING TECHNIQUES :
Laser light scattering technique :
• It is quick method for determination of size.
• Applied for particles < 1 µm.
• Rayleigh’s theory holds good for particles < 200nm, which
considers scattering intensity is proportional to sixth potency
of particle diameter.
•Diffraction technique:Laser diffraction can be applied for
particles >1µm
• Fraunhofer theory refers to proportionality between intensity
of diffraction and square of particle diameter.
• Scattering intensity depends on scattering angle, absorption ,
size of particles as well as refractive indices of both particles
and dispersion medium.
16. SURFACE CHARGE :1,3
• It is determined by zeta potential.
•Definition : zeta potential is the potential between tightly
bound surface liquid layer of particle and electroneutral layer.
•It provides the measure of net surface charge on the particle and
potential distribution at the interface.
•It is calculated using Helmholtz- Smoluchowski equation,
4ƞПµ
ζ = X 103
ɛE
•where ζ = zeta potential
ƞ = viscosity of dispersion medium.
µ = migration velocity.
ɛ = dielectric constant.
E = potential gradient between electrodes.
17.
18.
19. Surface Hydrophobicity :
Important influence on intraction of nanoparticles with
biological environment.
Several methods have been used,
1. Hydrophobic interaction chromatography.
2. Two phase partition.
3. contact angle measurement.
20. Nanoparticle yield :
% yield = Actual weight of product *100
Total weight of excipient & Drug
21. ENTRAPMENT EFFICIENCY 2
Centrifugation :
•Nanoparticle dispersion is to be centrifuged at 20,000 rpm
for 1hr to collect the supernatant liquid
•The collected liquid was filtered to measure the free
drug concentration after suitable dilution with a fresh
buffer and can be analyzed using HPLC or UV
Spectrophotometric.
•Entrapment efficiency = Wt. of drug incorporated/Wt.
of drug initially taken × 100
22. Protamine aggregation method :
•It is used for negatively charged or neutral liposomes.
•Dispersion is precipitated with protamine solution and
subsequently centrifuged at 2000 rpm.
•By analysing material in supernatant and liposomal pellet,
encapsulation efficiency can be determined.
23. CRYSTAL STRUCTURE :-1) Differential
scanning calorimetry :1,3
•It quantifies the enthalpic changes during endothermic and
exothermic phase transitions.
•Two aluminium plates are compared, one empty and the other
containing sample.
•Heat input of sample is adjusted so that its temperature
matches those of the reference pan.
•At the phase transition point, extra heat is required to
maintain the rise in temperature of the sample pan equal to that
of reference and is recorded directly.
Differential thermal analysis :
•It measures the temperature differences between reference and
sample.
24.
25. 2) X-ray diffraction : 1,3
•When a monochromatic x-ray beam is focused on a crystal,
atoms scatter the x-ray beam, in specific pattern.
Bragg’s equation : nλ = 2d sinθ
λ - wavelength of x-rays
θ - angle of incidence
d - interatomic distance
•A typical interference pattern arises due to specific repeat
distances of the associated interlayer spacing, d.
•Larger terms for d in the region of long range order are
registered by the small angle x-ray diffraction technique.
•For short range order, registered by wide angle x-ray
diffraction technique.
•Interferences are detected in two ways, film detection and
registration of x-ray counts with scintillation counters.
26. 3) FTIR Spectroscopic Analysis:-
•The infrared spectra are recorded on Fourier Transform
Spectrometer in the mid–infrared region (MIR) within the
range (400-4500 cm-1).
•Due to the complex interaction of atoms within the molecule,
IR absorption of the functional groups may vary over a wide
range.
•However, it has been found that many functional groups give
characteristic IR absorption at specific narrow frequency
range. Multiple functional groups may absorb at one particular
frequency range but a functional group often gives rise to
several characteristic absorptions.
•Stretching & bending vibrations are varied after formulation
can be observed. Thus, the spectral interpretations should not
be confined to one or two bands only actually the whole
spectrum should be examined.
27. INVITRO RELEASE5:
▪ The key objectives of in vitro release testing are one or more of
the following:
(a) assessing the effect of formulation factors and manufacturing
methods on the drug product,
(b) routine assessment of quality control to support batch release,
(c) substantiating product label claims,
(d) establishing an in vitro in vivo correlation/relationship
(IVIVC/R),
(e) assuring product sameness under the SUPAC guidelines,
(f) as a compendial requirement
28. ▪ In vitro Dissolution:-
(a) USP I (basket): 900 mL buffer at 100 rpm;
(b) USP II (paddle): 900 mL buffer at 100 rpm;
(c) USP IV (flow through cell): 900 mL buffer at a flow
rate of 1.6 mL/min (peristaltic pump, closed loop)
through a cell (internal diameter = 25 mm) and 0.2 𝜇m
membrane disc filter;
(d) dialysis bag (MWCO 12 kDa, inner volume = 7 mL)
placed into a USP II (paddle) in vitro release tester
(outer volume = 900 mL, paddle rpm = 100).
29. •Invitro release profile can be determined using standard dialysis,
diffusion cell or ultrafiltration technique.
Dialysis Method:
• In this method, physical separation of the dosage forms is
achieved by usage of a dialysis membrane which allows for ease of
sampling at periodic intervals. As with the other methods, several
adaptations of the DM have been reported in literature with key
differences in set-up, container size, and molecular weight cut-off
(MWCO) .
With the regular dialysis technique, the nanoparticles are
introduced into a dialysis bag containing release media (inner
media/compartment) that is subsequently sealed and placed in a
larger vessel containing release media (outer media/compartment),
agitated to minimize unstirred water layer effects.
30. In general, the volume enclosed in a dialysis bag (inner media) is
significantly smaller than the outer media. For instance, inner
media volumes reported in literature range from 1 to 10 mL,
whereas the outer media volume is much greater, typically around
40– 90 mL.
Thus, container size will depend on the total volume of release
media required for the in vitro release study. In the regular dialysis
technique, drug released from the nanoparticles diffuses through
the dialysis membrane to the outer compartment from where it is
sampled for analysis
31. Diffusion cell : evaluated in phosphate buffer utilizing
double chamber diffusion cells on a shaker stand.
•A millipore hydrophillic low-protein binding membrane
is placed between two chambers.
Ultrafiltration : Nanoparticle suspension is added
directly into a stirred ultrafiltration cell containing buffer.
• Samples are collected through ultrafiltration membrane
using less than 2 bar positive nitrogen pressure and
assayed for the released drug using standard procedure.
32. FDA Considerations For Regulation Of
Nanomaterial Containing Products4
▪ General considerations for nanotechnology
products:-
■ Characterization
■ Safety
■ Environmental impact
33. Characterization Considerations
■ What are the forms in which particles are
presented to host, cells and organelles?
□ Soluble vs. insoluble particles
□ Organic vs. inorganic molecules
□ Nanoemulsions, nanocrystal colloid dispersions
□ Liposomes
□ Nanoparticles that are combination products (drug-
device, drug-biologic, drug-device-biologic)
34. ■ What are the standard tools used for characterization
of nanoparticle properties?
■ What are validated assays to detect and quantify
nanoparticles in drug product and in tissues?
■ How do we determine long and short-term stability
of nanomaterials (in various environments)?
■ What are the critical physical and chemical properties,
including residual solvents, processing variables,
impurities and excipients?
■ How do physical characteristics impact product
quality and performance?
35. ■ What are the critical steps in the scale-up and
manufacturing process for nanotechnology products?
■ How are characterization and manufacturing
procedures assessed for “personalized therapies”?
□ What is the level of characterization needed?
□ Preclinical: ADME, toxicology?
□ CMC: extent of physical characterization?
36. Safety Considerations
■ As particle size gets smaller, there may be size-
specific effects on activity, such as:
□ Will nanoparticles gain access to tissues and cells that
normally would be bypassed by larger particles?
□ Once nanoparticles enter tissues, how long do they
remain there?
□ How are they cleared from tissues and blood?
□ If nanoparticles enter cells, what effects do they have on
cellular and tissue functions (transient and/or permanent)?
□ Might there be different effects in different cells types?
37. ■ Route-specific issues:
□ Inhalation
■ Local respiratory toxicity
■ Distribution in respiratory tissues
■ Systemic bioavailability
□ Sub-cutaneous
■ Sensitization
□ Ocular
■ Intravitreal retention
□ Oral
■ Increased bioavailability
□ Dermal
■ Increased dermal and systemic bioavailability
■ Increased follicule retention
■ Distribution to local lymph nodes
■ Phototoxicity
□ IV
■ Hemocompatibility
■ Sterility
■ Different tissue distribution and half-life of API (with targeted
delivery and liposomes)
38. ■ ADME
□ What are the differences in the ADME profile, for
nanoparticles versus larger particles of the same drug?
□ Are current methods used for measuring drug levels in
blood and tissues adequate for assessing levels of
nanoparticles (appropriateness of method, limits of
detection)?
□ How accurate are mass balance studies, especially if
levels of drug administered are very low; i.e. can 100%
of the amount of drug administered be accounted for?
■ How is clearance of targeted nanoparticles
accurately assessed? If nanoparticles
concentrate in a particular tissue, how will
clearance be assessed accurately?
■ Can nanoparticles be successfully labeled
for ADME studies?
39. Environmental Considerations
■ Can nanoparticles be released into the environment
following human and animal use?
■ What methodologies would identify the nature, and
quantify the extent, of nanoparticle release in the
environment?
■ What might be the environmental impact on
other species (animals, fish, plants,
microorganisms)?
40. Current Preclinical Tests for
Safety Evaluation
■ Pharmacology
■ Safety pharmacology
■ Toxicology (including clinical pathology and histopathologic
analysis)
■ ADME
■ Genotoxicity
■ Developmental toxicity
■ Immunotoxicity
■ Carcinogenicity
■ Other
41. Adequacy of Current Preclinical
System?
■ Existing battery of preclinical tests is currently
believed to be adequate.
■ Why?
□ High dose multiples used
□ At least 2 animal species used
□ Extensive histopathology on most organs
□ Functional tests (cardiac, neurologic, respiratory,
reproductive, immune system, etc/…)
□ Extended treatment periods (up to 2 years for
carcinogenicity studies)
42. Future Testing Considerations
■ Types of preclinical screening tests that may be useful in
identifying potential risks (Screening IND?):
□ In vitro assays
□ In vivo assays
■ Role of new technologies to help identify potential toxicities:
□ Omics
□ Imaging (qualitative/quantitative)
■ What is the role of modeling:
□ In predicting exposure?
□ In predicting safety concerns?
□ In helping design of personalized therapies?
43. Are There Special Testing Requirements for
Nanotechnology Products?
■ Currently there are no testing requirements
that are specific to nanotechnology products.
■ CDER/FDA’s current requirements for
safety testing of products is very rigorous.
■ However if research identifies toxicological
risks that are unique to nanomaterials,
additional testing requirements may become
necessary.
44. •REFERENCES :
1. Vyas S.P. , Khar R.K. Targeted & Controlled Drug Delivery,
Novel Carrier Systems, CBS Publication ,2002 ,Page No.249-
277,331-387
2. Nanoparticles –A Review by VJ Mohanraj & Chen Y, Tropical
Journal of Pharmaceutical Research 2006; 5(1): 561-573
3. Jain N. K., Controlled and novel Drug Delivery, 1st edition
2001, CBS Publication; 292 - 301.
4. www.FDA.GOV/NANOTECHNOLOGY
5. X. Cao,W.W.Deng, M. Fu et al., “In vitro release and in vitroin
vivo correlation for silybin meglumine incorporated into
Hollow-type mesoporous silica nanoparticles,” International
Journal of Nanomedicine, vol. 7, pp. 753–762, 2012.
6. Google.com(images)