The chapter deals with the preformulation studies that have to be considered while designing a dosage form and developing a formulation that is suitable for a patient. Here, physical and chemical properties of a drug substance are studied along with biopharmaceutical classification of drugs. Also a detailed study on the application of preformulation studies in different dosage forms are also studied.
Preformulation Studies: Introduction to preformulation, goals and objectives, study of
physicochemical characteristics of drug substances.
a. Physical properties: Physical form (crystal & amorphous), particle size, shape, flow
properties, solubility profile (pKa, pH, partition coefficient), polymorphism.
b. Chemical Properties: Hydrolysis, oxidation, reduction, racemisation, polymerization
BCS classification of drugs & its significant
Application of preformulation considerations in the development of solid, liquid oral and
parenteral dosage forms and its impact on stability of dosage forms.
The chapter deals with the preformulation studies that have to be considered while designing a dosage form and developing a formulation that is suitable for a patient. Here, physical and chemical properties of a drug substance are studied along with biopharmaceutical classification of drugs. Also a detailed study on the application of preformulation studies in different dosage forms are also studied.
Preformulation Studies: Introduction to preformulation, goals and objectives, study of
physicochemical characteristics of drug substances.
a. Physical properties: Physical form (crystal & amorphous), particle size, shape, flow
properties, solubility profile (pKa, pH, partition coefficient), polymorphism.
b. Chemical Properties: Hydrolysis, oxidation, reduction, racemisation, polymerization
BCS classification of drugs & its significant
Application of preformulation considerations in the development of solid, liquid oral and
parenteral dosage forms and its impact on stability of dosage forms.
Direct compression is the most advanced technology. It involves only blending and compression. Thus offering advantage particularly in terms of speedy production. Because it requires fewer unit operations, less machinery, reduced number of personnel and considerably less processing time along with increased product stability.
Decomposition and stabilization of pharmaceutical productsArshad Khan
Drug stability:Stabilization of medicinal agents against common reactions like hydrolysis & oxidation. Accelerated stability testing in expiration dating of pharmaceutical dosage forms. Photolytic degradation and its prevention.
Hard gelatin capsules - a detailed studyTeny Thomas
The presentation involves a descriptive study on hard gelatin capsules which includes the production of the hard gelatin capsule shell, size of the capsules, capsule filling machines and the finishing techniques. The presentation also involves the special techniques of capsule formulation and the quality control tests of hard gelatin capsules
Direct compression is the most advanced technology. It involves only blending and compression. Thus offering advantage particularly in terms of speedy production. Because it requires fewer unit operations, less machinery, reduced number of personnel and considerably less processing time along with increased product stability.
Decomposition and stabilization of pharmaceutical productsArshad Khan
Drug stability:Stabilization of medicinal agents against common reactions like hydrolysis & oxidation. Accelerated stability testing in expiration dating of pharmaceutical dosage forms. Photolytic degradation and its prevention.
Hard gelatin capsules - a detailed studyTeny Thomas
The presentation involves a descriptive study on hard gelatin capsules which includes the production of the hard gelatin capsule shell, size of the capsules, capsule filling machines and the finishing techniques. The presentation also involves the special techniques of capsule formulation and the quality control tests of hard gelatin capsules
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
Comparative structure of adrenal gland in vertebrates
Flow properties of powders
1. FLOW PROPERTIES OF POWDERS
By-Dr. Smita D. More
Dept of Pharmaceutics
PES, Moedren College of Pharmacy (For Ladies), Moshi
2. • Powders may be free-flowing or cohesive (Sticky).
• Many common manufacturing problems are attributes to
powder flow.
1. Powder transfer through large equipment such as hopper.
2. Uneven powder flow excess entrapped air within
powders capping or lamination.
3. Uneven powder flow increase particle’s friction with
die wall causing lubrication problems and increase dust
contamination risks during powder transfer.
3. 4. Powder storage, which for example result in
caking tendencies within a vial or bag after
shipping or storage time.
5. Separation of small quantity of the powder
from the bulk-specifically just before the
creation of individual doses such as during
tableting, encapsulation and vial filling which
affect the weight uniformity of the dose (under
or over dosage).
5. • Tests to evaluate the flowability of a powder.
1. Carr’s compressibility index.
2. Hausner ratio.
3. The angle of repose ().
6. Carr’s compressibility index
• A volume of powder is filled into a graduated glass
cylinder and repeatedly tapped for a known
duration. The volume of powder after tapping is
measure.
Tapped density- Poured or bulk density
Carr’s index (%)= X 100
Tapped density
Bulk density= weight/bulk volume
Tapped density=weight/true volume
7. Carr’s compressibility index
Flow description % Compressibility
Excellent flow 5 – 15
Good 16 – 18
Fair 19 – 21
Poor 22 – 35
Very Poor 36 -40
Extremely poor 40
Relationship between powder flowability and % compressibility
8. Hausner ratio
Tapped density
Hausner ratio =
Poured or bulk density
Hausner ratio was related to interparticle friction:
• Value less than 1.25 indicates good flow (=20% Carr).
9. Hausner ratio
• The powder with low interparticle friction, such as
coarse spheres.
• Value greater than 1.5 indicates poor flow (= 33%
Carr’s Compressibility Index)).
• More cohesive, less free-flowing powders such as
flakes.
• Between 1.25 and 1.5 added glidant normally
improves flow.
• 1.5 added glidant doesn’t improve flow.
10. The angle of repose ()
• The sample is poured onto the
horizontal surface and the angle
of the resulting pyramid is
measured.
• The user normally selects the
funnel orifice through which the
powder flows slowly and
reasonably constantly.
11. The angle of repose ()
1. Angle of repose less than 20 (Excellent flow).
2. Angle of repose between20-30 (Good flow).
3. Angle of repose between 30-40 (Pass flow).
4. Angle of repose greater than 40 (Poor flow).
• The rougher and more irregular the surface of
the particles, the higher will be the angle of
repose.
12. Factors affecting the flow
properties of powder
Improvement
of
Powder Flowabilty
Particle’s
size &
Distribution
Particle
Shape &
texture
Surface
forces
Flow
Activators
13. Factors affecting the flow
properties of powder
1. Alteration of Particle’s size & Distribution
2. Alteration of Particle shape & texture
3. Alteration of Surface Forces
4. Formulation additives (Flow activators)
14. Factors affecting the flow
properties of powder
Alteration of Particle’s size & Distribution
• There is certain particle size at which powder’s flow
ability is optimum.
• Coarse particles are more preferred than fine ones as
they are less cohesive.
• The size distribution can also be altered to improve
flowability by removing a proportion of the fine
particle fraction or by increasing the proportion of
coarser particle’s such as occurs in granulation.
15. Factors affecting the flow
properties of powder
Alteration of Particle shape & texture
Particle’s Shape
• Generally, more spherical particles have better flow
properties than more irregular particles.
• Spherical particles are obtained by spray drying, or
by temperature cycling crystallization.
16. Factors affecting the flow
properties of powder
Alteration of Particle shape & texture
Particle’s texture
• Particles with very rough surfaces will be more
cohesive and have a greater tendency to
interlock than smooth surfaced particles.
17. Factors affecting the flow
properties of powder
Alteration of Surface Forces
• Reduction of electrostatic charges can improve powder
flowability.
• Electrostatic charges can be reduced by altering process
conditions to reduce frictional contacts.
• Moisture content of particle greatly affects powder’s flowability.
• Adsorbed surface moisture films tend to increase bulk density
and reduce porosity.
• Drying the particles will reduce the cohesiveness and improve
the flow.
• Hygroscopic powder’s stored and processed under low humidity
conditions.
18. Factors affecting the flow
properties of powder
Formulation additives (Flow activators)
• Flow activators are commonly referred as a
glidants.
• Flow activators improve the flowability of
powders by reducing adhesion and cohesion.
e. g. Talc, maize starch and magnesium stearate.