This document provides an overview of fundamentals of high performance liquid chromatography (HPLC). It explains that HPLC involves injecting a liquid sample into a column packed with tiny particles and using a liquid mobile phase to separate the sample components. The major components of an HPLC system are identified as the pump, injector, column, detector and computer. Common applications of HPLC include qualitative analysis to identify compounds, quantitative analysis to measure amounts, and trace analysis to detect very low concentration compounds.
Instrumentation of HPLC, principle by kk sahuKAUSHAL SAHU
INTRODUCTION
Instrumentation of HPLC
TYPES OF HPLC
PARAMETERS
APPLICATION
CONCLUSION
REFERENCE
High-performance liquid chromatography ( HPLC) is a specific form of column chromatography generally used in biochemistry and analysis to separate, identify, and quantify the active compounds.
HPLC mainly utilizes a column that holds packing material (stationary phase), a pump that moves the mobile phase(s) through the column, and a detector that shows the retention times of the molecules.
Chromatography is a laboratory technique for the separation of a mixture. The mixture is dissolved in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase.
Instrumentation of HPLC, principle by kk sahuKAUSHAL SAHU
INTRODUCTION
Instrumentation of HPLC
TYPES OF HPLC
PARAMETERS
APPLICATION
CONCLUSION
REFERENCE
High-performance liquid chromatography ( HPLC) is a specific form of column chromatography generally used in biochemistry and analysis to separate, identify, and quantify the active compounds.
HPLC mainly utilizes a column that holds packing material (stationary phase), a pump that moves the mobile phase(s) through the column, and a detector that shows the retention times of the molecules.
Chromatography is a laboratory technique for the separation of a mixture. The mixture is dissolved in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase.
A brief review on development and validation of hplc method.adhirajain
the slides in the ppt gives a brief review on product development and its validation in HPLC method. Contents are with advantages, disadvantages, application , classification and methods for development.
An introduction to HPLC(High Performance LIquid Chromatography) was depicted in the presentation.
Simultaneously, the each and every component of HPLC was explained by depicting with a diagram in the slide.
The key notes are also included in the presentation.
Content include basic introduction to chromatography. Brief view of Liquid Chromatography. HPLC introduction, other names, types of HPLC, detailed instrumentation with image of each part, and applications. Sources of content described in 'References' entitled slide. This presentation was prepared for the partial fulfillment of Master of Pharmacy.
HPLC
Chromatography
Mobile Phase & Stationary Phase
CLASSIFICATION OF CHROMATOGRAPHY
Characteristics of HPLC
Purpose
Superiority of HPLC
TYPES OF HPLC TECHNIQYES
Principle
PHASING SYSTEM & (normal vs reversed phase)
INSTRUMENTATION
Flow diagram of HPLC instrument
Advantages of HPLC
HPLC Principle,Instrumentation and ApplicationAlakesh Pradhan
HPLC Chromatography and its principle
Liquid chromatography
High Performance Liquid Chromatography ( HPLC )
The components of the high performance liquid chromatograph (HPLC).
The separation process.
The chromatogram
One of the most developed cities of India, the city of Chennai is the capital of Tamilnadu and many people from different parts of India come here to earn their bread and butter. Being a metropolitan, the city is filled with towering building and beaches but the sad part as with almost every Indian city
A brief review on development and validation of hplc method.adhirajain
the slides in the ppt gives a brief review on product development and its validation in HPLC method. Contents are with advantages, disadvantages, application , classification and methods for development.
An introduction to HPLC(High Performance LIquid Chromatography) was depicted in the presentation.
Simultaneously, the each and every component of HPLC was explained by depicting with a diagram in the slide.
The key notes are also included in the presentation.
Content include basic introduction to chromatography. Brief view of Liquid Chromatography. HPLC introduction, other names, types of HPLC, detailed instrumentation with image of each part, and applications. Sources of content described in 'References' entitled slide. This presentation was prepared for the partial fulfillment of Master of Pharmacy.
HPLC
Chromatography
Mobile Phase & Stationary Phase
CLASSIFICATION OF CHROMATOGRAPHY
Characteristics of HPLC
Purpose
Superiority of HPLC
TYPES OF HPLC TECHNIQYES
Principle
PHASING SYSTEM & (normal vs reversed phase)
INSTRUMENTATION
Flow diagram of HPLC instrument
Advantages of HPLC
HPLC Principle,Instrumentation and ApplicationAlakesh Pradhan
HPLC Chromatography and its principle
Liquid chromatography
High Performance Liquid Chromatography ( HPLC )
The components of the high performance liquid chromatograph (HPLC).
The separation process.
The chromatogram
One of the most developed cities of India, the city of Chennai is the capital of Tamilnadu and many people from different parts of India come here to earn their bread and butter. Being a metropolitan, the city is filled with towering building and beaches but the sad part as with almost every Indian city
R3 Stem Cells and Kidney Repair A New Horizon in Nephrology.pptxR3 Stem Cell
R3 Stem Cells and Kidney Repair: A New Horizon in Nephrology" explores groundbreaking advancements in the use of R3 stem cells for kidney disease treatment. This insightful piece delves into the potential of these cells to regenerate damaged kidney tissue, offering new hope for patients and reshaping the future of nephrology.
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Leading the Way in Nephrology: Dr. David Greene's Work with Stem Cells for Ki...Dr. David Greene Arizona
As we watch Dr. Greene's continued efforts and research in Arizona, it's clear that stem cell therapy holds a promising key to unlocking new doors in the treatment of kidney disease. With each study and trial, we step closer to a world where kidney disease is no longer a life sentence but a treatable condition, thanks to pioneers like Dr. David Greene.
Antibiotic Stewardship by Anushri Srivastava.pptxAnushriSrivastav
Stewardship is the act of taking good care of something.
Antimicrobial stewardship is a coordinated program that promotes the appropriate use of antimicrobials (including antibiotics), improves patient outcomes, reduces microbial resistance, and decreases the spread of infections caused by multidrug-resistant organisms.
WHO launched the Global Antimicrobial Resistance and Use Surveillance System (GLASS) in 2015 to fill knowledge gaps and inform strategies at all levels.
ACCORDING TO apic.org,
Antimicrobial stewardship is a coordinated program that promotes the appropriate use of antimicrobials (including antibiotics), improves patient outcomes, reduces microbial resistance, and decreases the spread of infections caused by multidrug-resistant organisms.
ACCORDING TO pewtrusts.org,
Antibiotic stewardship refers to efforts in doctors’ offices, hospitals, long term care facilities, and other health care settings to ensure that antibiotics are used only when necessary and appropriate
According to WHO,
Antimicrobial stewardship is a systematic approach to educate and support health care professionals to follow evidence-based guidelines for prescribing and administering antimicrobials
In 1996, John McGowan and Dale Gerding first applied the term antimicrobial stewardship, where they suggested a causal association between antimicrobial agent use and resistance. They also focused on the urgency of large-scale controlled trials of antimicrobial-use regulation employing sophisticated epidemiologic methods, molecular typing, and precise resistance mechanism analysis.
Antimicrobial Stewardship(AMS) refers to the optimal selection, dosing, and duration of antimicrobial treatment resulting in the best clinical outcome with minimal side effects to the patients and minimal impact on subsequent resistance.
According to the 2019 report, in the US, more than 2.8 million antibiotic-resistant infections occur each year, and more than 35000 people die. In addition to this, it also mentioned that 223,900 cases of Clostridoides difficile occurred in 2017, of which 12800 people died. The report did not include viruses or parasites
VISION
Being proactive
Supporting optimal animal and human health
Exploring ways to reduce overall use of antimicrobials
Using the drugs that prevent and treat disease by killing microscopic organisms in a responsible way
GOAL
to prevent the generation and spread of antimicrobial resistance (AMR). Doing so will preserve the effectiveness of these drugs in animals and humans for years to come.
being to preserve human and animal health and the effectiveness of antimicrobial medications.
to implement a multidisciplinary approach in assembling a stewardship team to include an infectious disease physician, a clinical pharmacist with infectious diseases training, infection preventionist, and a close collaboration with the staff in the clinical microbiology laboratory
to prevent antimicrobial overuse, misuse and abuse.
to minimize the developme
Navigating the Health Insurance Market_ Understanding Trends and Options.pdfEnterprise Wired
From navigating policy options to staying informed about industry trends, this comprehensive guide explores everything you need to know about the health insurance market.
The dimensions of healthcare quality refer to various attributes or aspects that define the standard of healthcare services. These dimensions are used to evaluate, measure, and improve the quality of care provided to patients. A comprehensive understanding of these dimensions ensures that healthcare systems can address various aspects of patient care effectively and holistically. Dimensions of Healthcare Quality and Performance of care include the following; Appropriateness, Availability, Competence, Continuity, Effectiveness, Efficiency, Efficacy, Prevention, Respect and Care, Safety as well as Timeliness.
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CHAPTER 1 SEMESTER V - ROLE OF PEADIATRIC NURSE.pdfSachin Sharma
Pediatric nurses play a vital role in the health and well-being of children. Their responsibilities are wide-ranging, and their objectives can be categorized into several key areas:
1. Direct Patient Care:
Objective: Provide comprehensive and compassionate care to infants, children, and adolescents in various healthcare settings (hospitals, clinics, etc.).
This includes tasks like:
Monitoring vital signs and physical condition.
Administering medications and treatments.
Performing procedures as directed by doctors.
Assisting with daily living activities (bathing, feeding).
Providing emotional support and pain management.
2. Health Promotion and Education:
Objective: Promote healthy behaviors and educate children, families, and communities about preventive healthcare.
This includes tasks like:
Administering vaccinations.
Providing education on nutrition, hygiene, and development.
Offering breastfeeding and childbirth support.
Counseling families on safety and injury prevention.
3. Collaboration and Advocacy:
Objective: Collaborate effectively with doctors, social workers, therapists, and other healthcare professionals to ensure coordinated care for children.
Objective: Advocate for the rights and best interests of their patients, especially when children cannot speak for themselves.
This includes tasks like:
Communicating effectively with healthcare teams.
Identifying and addressing potential risks to child welfare.
Educating families about their child's condition and treatment options.
4. Professional Development and Research:
Objective: Stay up-to-date on the latest advancements in pediatric healthcare through continuing education and research.
Objective: Contribute to improving the quality of care for children by participating in research initiatives.
This includes tasks like:
Attending workshops and conferences on pediatric nursing.
Participating in clinical trials related to child health.
Implementing evidence-based practices into their daily routines.
By fulfilling these objectives, pediatric nurses play a crucial role in ensuring the optimal health and well-being of children throughout all stages of their development.
VERIFICATION AND VALIDATION TOOLKIT Determining Performance Characteristics o...
hPLC NEW ONE.pptx
1. Fundamentals of High
Performance Liquid
Chromatography (HPLC)
HPLC Basics
This course will enable you to:
• Explain the general principles of HPLC analyses
• Know the major application areas of HPLC
• Identify the major components of an HPLC system
and explain their principles of operation
3. First, What is Liquid
Chromatography?
HPLC Basics
• Liquid chromatography is a separation technique that involves:
• the placement (injection) of a small volume of liquid sample
• into a tube packed with porous particles (stationary phase)
• where individual components of the sample are transported along
the packed tube (column) by a liquid moved by gravity.
• The components of the sample are separated from one another by the column
packing that involves various chemical and/or physical interactions between their
molecules and the packing particles.
• The separated components are collected at the exit of this column and identified
by an external measurement technique, such as a spectrophotometer that
measures the intensity of the color, or by another device that can measure their
amount.
5. • HPLC is an abbreviation for
High Performance Liquid Chromatography
(It has also been referred to as High Pressure LC)
• HPLC has been around for about 35 years and is the largest
separations technique used
• The history of HPLC:
• Beginning of the 60’s: start of HPLC as High Pressure
Liquid Chromatography
• End of the 70’s improvements of column material and
instrumentation – High Performance Liquid
Chromatography
• Since beginning of the 80’s: “boom” in HPLC started
• Since 2006 new terms popped up like UPLC
Then, What is
HPLC?
HPLC Basics
HPLC in 1973
HPLC in 2022
6. What is
HPLC?
HPLC Basics
• HPLC is a separation technique that involves:
• the injection of a small volume of liquid sample
• into a tube packed with tiny particles (3 to 5 micron (µm) in diameter called
the stationary phase)
• where individual components of the sample are moved down the packed tube
(column) with a liquid (mobile phase) forced through the column by high
pressure delivered by a pump.
• These components are separated from one another by the column packing that
involves various chemical and/or physical interactions between their molecules
and the packing particles.
• These separated components are detected at the exit of this tube (column) by a
flow-through device (detector) that measures their amount. An output from this
detector is called a “liquid chromatogram”.
In principle, LC and HPLC work the same way except the speed,
efficiency, sensitivity and ease of operation of HPLC is vastly superior.
7. 0 2 4 6 8 10 12 14 min
Time after injection
This is the chromatogram resulting from the injection of a small volume of liquid
extracted from a vitamin E capsule that was dissolved in an organic solvent. Modern
HPLC separations usually require 10- to 30-minutes each.
Point of sample injection
into the column
These are called chromatographic
peaks and each one represents a
separated compound
Compound A
What Does a Liquid Chromatogram
Look Like?
HPLC Basics
Compound B
Compound C
8. What does a high pressure LC
look like?
HPLC Basics
(1) Describing the 5 major HPLC components and their functions …
1. Pump:
• The role of the pump is to force a liquid (called the mobile phase) through the liquid
chromatograph at a specific flow rate, expressed in milliliters per min(mL/min).
• Normal flow rates in HPLC are in the 1- to 2-mL/minrange.
• Typical pumps can reach pressures in the range of 6000-9000 psi (400- to 600-bar).
• During the chromatographic experiment, a pump can deliver a constant mobile phasecomposition
(isocratic) or an increasing mobile phase composition(gradient).
2. Injector:
• The injector serves to introduce the liquid sample into the flow stream of the mobile phase.
• Typical sample volumes are 5- to 20-microliters(µL).
• The injector must also be able to withstand the high pressures of the liquid system.
• An autosampler is the automatic version for when the user has many samples to analyzeor
when manual injection is not practical.
1
2
5
Solvent reservoirs
and degassing
3
4
9. (2) Describing the 5 major HPLC components and their functions …
HPLC Basics
3. Column:
• Considered the “heart of the chromatograph” the column’s stationary phase separates the
sample components of interest using various physical and chemicalparameters.
• The small particles inside the column are what cause the high backpressureat normal
flow rates.
• The pump must push hard to move the mobile phase through the column andthis
resistance causes a high pressure within thechromatograph.
4. Detector:
• The detector can see (detect) the individual molecules that come out (elute) from the column.
• A detector serves to measure the amount of those molecules so that the chemist can
quantitatively analyze the sample components.
• The detector provides an output to a recorder or computer that results in the liquid
chromatogram (i.e., the graph of the detectorresponse).
5. Computer:
• Frequently called the data system, the computer not only controls all the modules of the
HPLC instrument but it takes the signal from the detector and uses it to determine the time of
elution (retention time) of the sample components (qualitative analysis) and the amount of
sample (quantitative analysis).
1
2
5
Solvent reservoirs
and degassing
3
4
10. What is HPLC used for?
Separation and analysis of non-volatile or thermally-unstable compounds
HPLC Basics
HPLC is optimum for the separation of chemical and biological compounds
that are non-volatile
NOTE: If a compound is volatile (i.e. a gas, fragrance, hydrocarbon ingasoline,
etc.), gas chromatography is a better separationtechnique.
Typical non-volatile compounds are:
Pharmaceuticals like aspirin, ibuprofen, or acetaminophen (Tylenol)
Salts like sodium chloride and potassium phosphate
Proteins like egg white or blood protein
Organic chemicals like polymers (e.g. polystyrene, polyethylene)
Heavy hydrocarbons like asphalt or motor oil
Many natural products such as ginseng, herbal medicines, plant extracts
Thermally unstable compounds such as trinitrotoluene (TNT), enzymes
11. min
0 2.5 15
Retention time
of compoundA
Injection point
(time zero)
The identification (ID) of individual compounds in the sample;
• the most common parameter for compound ID is its retention time (the time it takes for that
specific compound to elute from the column afterinjection);
• depending on the detector used, compound ID is also based on the chemical structure,molecular
weight or some other molecular parameter.
Retention time
of compoundB
5 7.5 10 12.5
Time after injection
What is HPLC used
for?
Qualitative analysis
HPLC Basics
12. What is HPLC used
for?
QuantitativeAnalysis
HPLC Basics
The measurement of the amount of a compound in a sample (concentration); meaning,
how much is there?;
There are two main ways to interpret a chromatogram (i.e. perform quantification):
1. determinationof the peak height of a chromatographic peak as measured from the baseline;
2. determination of the peak area (see figurebelow);
In order to make a quantitative assessment of the compound, a sample with a known
amount of the compound of interest is injected and its peak height or peak area is
measured. In many cases, there is a linear relationship between the height or area and
the amount of sample.
0 2 4 6 8 10 12 14 min
A
B
C
D
Peak area of CompoundA
Peak area of CompoundA
Peak area of CompoundA
Peak area of CompoundA
Peak height
of
CompoundA
13. What is HPLC used
for?
Trace analysis
HPLC Basics
0 2 4 6 12 14 min
8 10
Time after injection
A trace compound is a compound that is of interest to the analyst but it’s concentration is
very low, usually less than 1% by weight, often parts per million (ppm) or lower;
• the determination of trace compounds is very important in pharmaceutical, biological,
toxicology, and environmental studies since even a trace substance can be harmfulor
poisonous;
• in a chromatogram trace substances can be difficult to separate or detect;
• high resolution separations and very sensitive detectors arerequired.
These are themain
substances in the
sample
These are the trace
substances in the sample
14. Modular HPLC System –
basic configuration with
isocratic pump, manual
injector, variable
wavelength detector, and
hand-held controller
Modular HPLC System –
high-end configuration with
quaternary pump,
autosampler, column
thermostat, diode array
detector, and computerwith
control and data analysis
SW
Integrated HPLC System
“all parts in one box” –
different configurations
possible, here with
gradient pump,
autosampler, column oven,
VWD, and computer with
control and data analysis
SW (not shown on picture)
Examples of Different
Instruments and
Configurations
HPLC Basics
15. Let’s Look at Individual
Modules…
HPLC Basics
Pump Module – types:
• Isocratic pump - delivers constant mobile phase composition;
• solvent must be pre-mixed;
• lowest cost pump
• Gradient pump - delivers variable mobile phase composition;
• can be used to mix and deliver an isocratic mobile phase or a gradient mobile phase
– Binary gradient pump – delivers two solvents
– Quaternary gradient pump – four solvents
Pump
16. Gradient vs. Isocratic
Conditions
HPLC Basics
Isocratic
mobile phase solventcomposition
remains constant with time
• Best for simple separations
• Often used in quality control applicationsthat
support and are in close proximity to a
manufacturing process
Gradient
mobile phase solvent (“B”) composition
increases with time
• Best for the analysis of complex samples
• Often used in method developmentfor
unknown mixtures
• Linear gradients are most popular
(for example, the “gradient” shown atright)
70
60
50
40
30
20
10
0
0 5 10 15
Time, minutes
20 25
%
of
Solvent
B
in
Mobile
Phase
Isocratic Gradient
Pump
17. 2
0 2
5
5
0
7
5
15
Time
(min)
0 5 1
0
2
0
2
5
3
0
Time
(min)
1,
2
3
4
5
6
7
8
1
3
4
5
6
7
8
Separation of Herbicides on ZORBAX StableBond-C18
Column: ZORBAX SB-C18
4.6 x 150 mm, 5 µm
A: H2O with 0.1% TFA, pH 2
B: Acetonitrile
1.0 mL/min
35°C
1. Tebuthiuron
2. Prometon
3. Prometryne
4. Atrazine
5. Bentazon
6. Propazine
7. Propanil
8. Metolachlor
Mobile Phase:
Flow Rate:
Temperature:
Sample:
Isocratic Elution
70% water/30% Acetonitrile
Gradient Elution
20 – 60% Acetonitrile in water
in 30 min.
Note:
last peak eluted in
~70 minutes
Note:
last peak eluted
in ~ 28 minutes
and it is sharper
Why Are Mobile Phase
Gradients Used in HPLC?
HPLC Basics
Pump
18. Manual Injector:
1. User manually loads sample into the injector usinga
syringe
2. and then turns the handle to inject sample into the
flowing mobile phase
… which transports the sample into the beginning
(head) of the column, which is at highpressure
Autosampler:
1. User loads vials filled with sample solution into the
autosampler tray (100 samples)
2. and the autosampler automatically
1. measures the appropriate sample volume,
2. injects the sample,
3. then flushes the injector to be ready for the next
sample, etc., until all sample vials are processed…
… for unattended automatic operation
Sample Injection
… how is a sample actually put into an LC system
HPLC Basics
19. Injection System
• The injector is located on the high pressure side of the pump.
• Sample injection valves allow effective sample introduction without interrupting the
flow or altering the system pressure.
Components of the sample injection valve
A needle or syringe to pierce the vial septum
A metering device to measure the aspirated amount of sample liquid
A loop or holding device to retain the sample prior to injection
A valve which is used to alter the hydraulic path of the eluent
through the device in order to affect direct injection of the sample plug into the
eluent stream under pressure
HPLC Basics
20. Steps in a manual injection
process.
HPLC Basics
20
There are mainly 3steps
Step 1:
The sample is introduced using a
syringe into the sample loop via a
port on the injection valve.
Depending upon the injection type
the loop will either partially or
completely filled.
21. Step 2:
Once the sample is loaded
the valve is turned to the
‘inject’ position.
The rotor seal channels move
and connect different ports on
the stator. The pump is now
able to push mobile phase
through the sample loop,
transferring the sample onto
the column.
HPLC Basics
21
22. 22
Step 3:
Once the injection has been made the
valve is returned to the ‘load’ position.
This enables loop filling for the next injection.
Some people prefer to leave in the inject
position until the next injection is required to
completely flush the loop and reduce
‘carryover’
HPLC Basics
23. HPLC
Columns
HPLC Basics
Within the Column is where separation occurs.
Key Point – Proper choice of column is critical for success in HPLC
Types of columns in HPLC:
• Analytical [internal diameter (i.d.) 1.0 - 4.6-mm; lengths 15 – 250 mm]
• Preparative (i.d. > 4.6 mm; lengths 50 – 250 mm)
• Capillary (i.d. 0.1 - 1.0 mm; various lengths)
• Nano (i.d. < 0.1 mm, or sometimes stated as < 100 µm)
Materials of construction for the tubing
• Stainless steel (the most popular; gives high pressure capabilities)
• Glass (mostly for biomolecules)
• PEEK polymer (biocompatible and chemically inert to most solvents)
LC Columns
LC Columns - analytical
24. • Columns are packed with small diameter porous particles.
– The most popular sizes are: 5-μm, 3.5- μm and1.8-μm
HPLC Columns Packing
Materials
Columns are packed using high-pressure to ensure that
they are stable during use
most users purchase pre-packedcolumns to use in their liquid
chromatographs
These porous particles in the column usually have a
chemically bonded phase on their surface which interacts
with the sample components to separate them from one
another
for example, C18 is a popular bondedphase
The process of retention of the sample components (often
called analytes) is determined by the choice of column
packing and the selection of the mobile phase to push the
analytes through the packed column.
HPLC Basics
LC column
packing material
LC Columns
25. Silica
Base Packing
Chemically bonded phase
Analyte molecules are attracted
to the chemically bonded phase
Typical Mechanism of an HPLC
Separation
HPLC Basics
LC Columns
26. Separation Modes of
HPLC
HPLC Basics
Key Point to Remember:
The correct selection of the column packing and the mobile phase arethe
most important factors in successful HPLC.
There are four major separation modes that are used to separate most compounds:
1. Reversed-phase chromatography
2. Normal-phase and adsorption chromatography
3. Ion exchange chromatography
4. Size exclusion chromatography
….Let’s briefly look at each mode
LC Columns
27. (1) Reversed-Phase Chromatography
(RPC)
HPLC Basics
• The column packing is non-polar (e.g. C18, C8,
C3, phenyl, etc.) and the mobile phase is water
(buffer) + water-miscible organicsolvent
(e.g. methanol, acetonitrile)
• RPC is, by far, the most popular mode…
• over 90% of chromatographers use this mode
• The technique can be used for non-polar,polar,
ionizable and ionic molecules …
• making RPC very versatile
• For samples containing a wide range of
compounds, gradient elution is often used…
• One begins with a predominantly water-based mobile
phase and then adds organic solvent as a function of
time.
• The organic solvent increases the solvent strength
and elutes compounds that are very strongly retained
on the RPC packing
4 5
m
i
n
0 1 2 3
m
A
U
0
5
1
0
1
5
1. LacticAcid
2. Acetic Acid
3. CitricAcid
4. FumaricAcid
5. SuccinicAcid
1
2
3 4
5
LC Columns
28. (2) Normal Phase or Adsorption
Chromatography
HPLC Basics
• In this mode, the column packing is polar (e.g. silica
gel, cyanopropyl-bonded, amino-bonded, etc.) and
the mobile phase is non-polar (e.g. hexane, iso-
octane, methylene chloride, ethyl acetate)
• Normal phase separations are performed less than
10% of the time.
• The technique is useful for:
• water-sensitive compounds
• geometric isomers
• cis-trans isomers
• class separations
• and chiral compounds.
LC Columns
29. (3) Ion Exchange
Chromatography
HPLC Basics
• In ion exchange, the column packing contains ionic groups (e.g.
sulfonic, tetraalkylammonium) and the mobile phase is an
aqueous buffer (e.g. phosphate, formate, etc.).
• Ion exchange is used by about 20% of the liquid
chromatographers
• The technique is well suited for:
• the separation of inorganic and organic anions and cationsin
aqueous solution.
• Ionic dyes, amino acids, and proteins can be separated byion
exchange because such compounds are salt in brinewater,
Application Example of Ion Exchange Chromatography
3
Basic proteins on strong cation exchanger (-SO -)
1. RNApolymerase
2. Chymotrypsinogen
3. Lysozyme
LC Columns
30. (4) Size Exclusion Chromatography
(SEC)
HPLC Basics
Gel Permeation Chromatogram of
Polybutadiene polymer on non-aqueous
SEC (GPC) column;
The monomers elute after the polymer;
column: PLgel mixed-D gel
LC Columns
• In SEC, there is no interaction between the sample compounds and the column packing
material. Instead, molecules diffuse into pores of a porous medium. Depending on their
size relative to the pore size, molecules are separated. Molecules larger than the pore
opening do not diffuse into the particles, while molecules smaller than the pore opening
enter the particle and are separated. Large molecules elute first. Smaller molecules
elute later
• The SEC technique is used by 10-15% of chromatographers, mainly for polymer
characterization and for proteins.
• There are two modes:
• non-aqueous SEC [sometimes termed Gel Permeation Chromatography (GPC)]and
• aqueous SEC [sometimes referred to an Gel FiltrationChromatography (GFC)].
31. Temperature Control in
HPLC
Why is it needed?
HPLC Basics
Reproducibility
• Retention in HPLC is temperature-dependent
• If temperature varies, then it is difficult to assign “peaks” to specific compounds in
the chromatogram and the peak areas/heights may vary
Solubility
Certain chemical compounds may have low solubility in the HPLC mobile phase
If they are injected into the flow stream they may precipitate or other difficulties
may arise
Stability
Certain chemical compounds, especially biological compounds such as enzymes
or proteins, may not be stable at room temperature or higher
The temperature needs to be much lower down to 4°C
32. Detection in
HPLC
HPLC Basics
There are many detection principles used to detect the compounds
eluting from an HPLC column.
The most common are:
• Spectroscopic Detection
• Refractive Index Detection
• Fluorescence Detection
33. Spectroscopic
Detection
HPLC Basics
Ultraviolet (UV) Absorption
• An ultraviolet light beam is directed through a flow cell and a sensor measures the light passing through the cell.
• If a compound elutes from the column that absorbs this light energy, it will change the amount of light energy falling on
the sensor.
• The resulting change in this electrical signal is amplified and directed to a recorder or data system.
• A UV spectrum is sometimes also obtained which may aid in the identification of a compound or series ofcompounds.
Variable Wavelength Detector Diode ArrayDetector
34. Spectroscopic
Detection
HPLC Basics
Mass Spectroscopy (MS)
• An MS detector senses a compound eluting from the HPLC column first by ionizing it then by
measuring it’s mass and/or fragmenting the molecule into smaller pieces that are unique to the
compound.
• The MS detector can sometimes identify the compound directly since its mass spectrum is like a
fingerprint and is quite unique to thatcompound.
Here is a mass spectrum of a simple
chemical compound, toluene.
The pattern of lines is very unique to this
compound. The largest peak in the
spectrum occurs at a mass of 91, which
is a fragment ion generated by loss of a
hydrogen atom.
35. Refractive Index (RI)
Detection
HPLC Basics
• The ability of a compound or solvent to deflect light provides a way to detect it.
• The RI is a measure of molecule’s ability to deflect light in a flowing mobile phase in a
flow cell relative to a static mobile phase contained in a reference flow cell.
• The amount of deflection is proportional to concentration.
• The RI detector is considered to be a universal detector but it is not very sensitive.
Schematic of a Deflection Type of RIDetector
36. Fluorescence
Detection
HPLC Basics
• Compared to UV-Vis detectors fluorescence detectors offer a higher sensitivity and
selectivity that allows to quantify and identify compounds and impurities in complex matrices
at extremely low concentration levels (trace level analysis).
• Fluorescence detectors sense only those substances that fluoresce
37. Summary HPLC
Basics
HPLC Basics
In this course, you were introduced to the:
General principles of HPLC and application uses of HPLC
Components of HPLC instrument configurations
Major separation modes in HPLC
Overview of HPLC columns