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Ultra Performance Liquid Chromatography


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P.VENKATESH A Seminar Report on Ultra Performance Liquid Chromatography (081C1R0046) DHANVANTHRI COLLEGE OF PHARMACEUTICAL SCIENCES MAHABOOB NAGAR Guide: Kamini Sethy , M.Pharm

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Introduction to chromatography Mikhail Tswett (1906), i n his experiment, a leaf extract sample in petroleum ether was allowed to pass through a column of CaCO 3 , pure ether was continued to flow through the column as a result of which various chlorophyll pigments, etc., were separated into a series of differently coloured and easily distinguished zones. Chromatography is regarded as an analytical technique employed for the purification and separation of organic and inorganic substances.

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Classification in chromatography Chromatography is divided into two classes: 1. Gas chromatography 2. Solution chromatography Chromatography can also be divided into the following general areas: 1. Adsorption chromatography 2. Partition chromatography 3. Exclusion chromatography 4. Ion exchange chromatography

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About UPLC By using smaller particles, speed and peak capacity can be extended to new limits. It also provides good resolution . According to Van Deemter , decrease in particle size less than 2.5 mm, a significant gain in efficiency is achieved.

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Van Deemter plot illustrating the evolution of particle sizes

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I:It is an overlay of both conventional (3 µm) HPLCand 1.7 µm UPLC for a five component sample mixture. II:It is an expansion of the first 0.6 minutes of the overlay to show the increased speed of UPLC, while resolution is still maintained.

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Principle Reducing the particle diameter of a packing material, column length. The back pressure requred for the use of the small particle column. 3. Monolithic columns provide lower flow resistance than conventional columns. 4. Columns can be operated at high flow rates.

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Theory of separations using small particles The fundamental resolution equation Efficiency is proportional to column length and inversely proportional to the particle size:

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Method optimization on UPLC Applying the scaling factor to the mobile phase. 2. The mobile phase flow rate was increased until limited by column back-pressure. 3. Reducing the total run time by increasing organic solvent content was more economical.

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HPLC Assay UPLC Assay Column C18, 50 x 4.6 mm, 4 µm particles BEH C18, 50 x 2.1 mm, 1.7 µm particles Flow rate 3.0 ml / min 0.6 ml / min Needle wash Methanol Methanol Injection volume 20 µl 3 µl partial loop fill OR 5 µl full loop fill. Gradient (time in min) ACN:H 2 O T0 (25:75), T6.5 (25:75), T7.5 (95:5), T9 (25:75), T10 (25:75) T0 (36:64), T1.1 (95:5), T1.3 (36:64) Total run time 10min 1.5min Total solvent consumption (including 0.5 min of delay time in between injections) Acetinitril:10.5ml Water: 21.0 ml Acetinitril:0.53ml Water: 0.66 ml Plate count 2000 7500 USP resolution 3.2 3.4 Lower limit of quantitation (LOQ) ~ 0.2 µg/ml ~ 0.054 µg/ml Delay volume ~ 720 µl ~ 110 µl

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Separation Modes of UPLC 1. Reversed-phase chromatography 2. Normal-phase and adsorption chromatography 3. Ion exchange chromatography 4. Size exclusion chromatography

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Temperature Control in UPLC Temperature control is needed to get Reproducibility Solubility Stability

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Temperature control system 1. Oven 2. Heater Block 3. Water bath Temperature control system

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Instrumentation I. Pump II. Solvent system III. Sample injector IV. Column V. Detector

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Schematic diagram of instrumentation of UPLC

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UPLC (Ultra Performance Liquid Chromatography)

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I. Pumps The most important advantages of pumps are: higher resolution, faster analyses, and increased sample load capacity. Pump Module – types • Isocratic pump - delivers constant mobile phase composition; solvent must be pre-mixed • Gradient pump - delivers variable mobile phase composition; a. Binary gradient pump b. Quaternary gradient pump

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Gradient vs. Isocratic Conditions Isocratic • Best for simple separations • Often used in quality control applications that support and are in close proximity to a manufacturing process. Gradient • Best for the analysis of complex samples • Often used in method development for unknown mixtures. • Linear gradients are most popular

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II. Solvent system A. Mobile phases several common properties: a . Purity b. Detector compatibility c. Chemical inertness B. Mobile phase reservoir The most common type of solvent reservoir is a glass bottle. Most of the manufacturers supply these bottles with special caps, Teflon tubing and filters to connect to the pump inlet and to the purge gas (helium) used to remove dissolved air.

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III. Sample Injection Manual Injector: User manually loads sample into the injector using a 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 high pressure.

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Auto sampler: User loads vials filled with sample solution into the auto sampler tray (100 samples) 2. And the auto sampler automatically a. Measures the appropriate sample volume, b. Injects the sample, c. Then flushes the injector to be ready for the next sample, etc., until all sample vials are processed for unattended automatic operation

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IV. The columns Types of columns in UPLC 1. Analytical column [internal diameter ( i.d .) 1.0 - 4.6-mm; lengths 15 – 250 mm] 2. Preparative column ( i.d . > 4.6 mm; lengths 50 – 250 mm) 3. Capillary column ( i.d . 0.1 - 1.0 mm; various lengths) 4. Nano column ( i.d . < 0.1 mm, or sometimes stated as < 100 µm)

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Column packing a. Porous, polymeric beds: b. Porous layer beds: based on styrene- divinyl benzene co-polymer. silica or modified silica on an spherical inert core (e.g. glass beds). c. Totally porous silica particles: (diameter < 10 µm) with narrow size range. Particles of diameter > 20 µ m are usually dry packed , while particles of diameter < 20 µ m are slurry packed , in which particles are suspended in a suitable solvent and the slurry so obtained is driven into column under pressure.

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V. Detector 1. Spectroscopic Detection 2. Refractive Index Detection 3. Fluorescence Detection

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1. 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.

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2. Refractive Index (RI) Detection The ability of a compound or solvent to deflect light provides a way to detect it.

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3. Fluorescence Detection Compared to UV-Vis detectors fluorescence detectors offer a higher sensitivity and selectivity that allows quantifying and identifying compounds and impurities in complex matrices at extremely low concentration levels (trace level analysis).

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VI. Data system Since the detector signal is electronic, using modern data collection techniques can aid the signal analysis. In addition, some systems can store data in a retrievable form for highly sophisticated computer analysis at a later time.

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9. Advantages of UPLC High resolution High speed It is up to 9 times faster, has up to twice the resolution and three times the sensitivity than that of HPLC . Quick and ease of instrument handling High sensitivity. Even neon particles can be separated easily. UPLC ( BH3 columns) can be used at broad range of pH ranging from 2 to 12.

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10. Applications One of the most common compromises in HPLC is sacrificing resolution for speed. The UPLC increase the resolution in shorter run times and it generates more information faster without sacrificing resolution. These newer technique fulfils the market needs. B. Together with an UPLC System merged with a mass spectrometer, it enables scientists to attain more information about the identity of pharmaceutical, biological, industrial and environmental compounds than conventional UV/Vis-based detector systems

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C. UPLC overcomes such problems, as illustrated in Figure 6, which shows a separation of eight diuretics in less than 1.6 minutes. The same separation on a 2.1 by 100mm 5µm C18 HPLC column yields almost identical resolution, but takes ten minutes. For some analyses, however, speed is of a secondary importance, and peak capacity and resolution are the priority.

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11. Other applications From injection of a poly-drug reference standard and whole blood extract, separation and identification of amphetamine, methamphetamine, ephedrine, pseudoephedrine, phentermine and ketamine in less than 3 min using the UPLC method. Determination of Coumarone in UPLC-Electro spray-Tandem Mass Spectrometry. UPLC used in bioanalysis , metabolite identification and method development.

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12. Conclusion Now a day’s various pharmaceutical companies are going to use HPLC and UPLC as separation techniques to increase the marketing needs. The new technology in chemistry and instrumentation provides more information per unit of work as UPLC begins to fulfill the promise of increased speed, resolution and sensitivity predicted for liquid chromatography

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THANK YOU ( Special thanks to my guide Kamini madam and Bala Tripura Sundari madam)

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