c h r o m a t o g r a p h y HyPURITY HPLC Columns Technical Guide The PURE Choice for Method Development Analyze Detect Measure Control
HyPURITY HPLC Columns The HyPURITY Family of Columns The best choice for superior chromatography Introduction to the HyPURITY Family Thermo Electron Corporation is dedicated to the design and manufacture of high quality HPLC media and columns. Over 0 years of experience has resulted in the development of an excellent quality program and certification with ISO 900:000. The HyPURITY family of columns has set new standards in column performance, characterization and validation. The quality assurance program has been designed to probe a number of diagnostic chromatographic tests. They ensure exceptional column-to-column and batch-to-batch reproducibility. The range of stationary phases bonded to the HyPURITY silica includes C8, C8, C, Cyano and the unique HyPURITY ADVANCE and HyPURITY AQUASTAR phases. This range of phases offers a wide spectrum of selectivity allowing the operator to resolve compounds at high and low ph and at extremes of polarity with excellent peak shape and outstanding column performance time after time. HyPURITY C8 columns: one of the most rugged and reliable columns available HyPURITY ADVANCE columns for alternative selectivity and exceptional peak shape of bases HyPURITY AQUASTAR columns for optimum aqueous stability and polar retention Ultra-pure, stable silica giving enhanced column lifetime, performance and reliability Superior efficiency and peak shape across a wide range of analyte types 90Å pore size provides extensive chromatographic options from small molecule to large peptide analyses Phase Particle Size Pore Size Carbon Load End-Capping Silica Type High Purity HyPURITY C8 and µm 90Å % Yes High purity base deactivated HyPURITY C8 µm 90Å 8% Yes High purity base deactivated HyPURITY C µm 90Å.% Yes High purity base deactivated HyPURITY Cyano µm 90Å % Yes High purity base deactivated HyPURITY ADVANCE and µm 90Å 0% - High purity base deactivated HyPURITY AQUASTAR and µm 90Å 0% Polar End-Capped High purity base deactivated Table : HyPURITY phase specifications Outstanding Silica Quality HyPURITY silica is manufactured in our state-of-the-art dedicated facility by a team of highly experienced chemists to bring you the highest quality silica available. The silica is essentially metal-free and the C8 is exceptionally stable at high and low ph. The rugged and robust manufacturing process ensures reproducibility and optimum quality, batch after batch. Within the manufacturing process, extra care is taken to ensure an extensively homogenous silica surface. This surface is a key precursor in the preparation of uniform bonded phases. Increased Stability and Lifetime The advanced manufacturing process generates outstanding chromatographic performance across a wide ph range and gives superior column reliability and lifetime. Silica-based reversed phase columns are generally stable in the ph range to 8. At ph values below, the bond holding the alkyl chain to the silica surface starts to dissociate and at ph values higher than 8, silica dissolution occurs. Analyses outside the ph range to 8 have therefore previously resulted in decreased column lifetime and performance. Each HyPURITY C8 batch has undergone rigorous stability trials at ph 0.9 and 0.6 to ensure that demanding analyses at extremes of ph and high temperature can be performed with confidence. This extension to the stable operating range at both high and low ph enhances column lifetime and enables columns to be used with conditions that would previously have resulted in a rapid deterioration of performance and lifetime. Example of the stability of HyPURITY C8 media are shown in Figures and. HyPURITY C8, µm, 0x.6mm Part No.: 0-60 Eluent: 60% ACN / 0% 0.0M KH PO, ph. Flow Rate:. ml/min Detector: UV @. Uracil. Pyridine. Methylaniline. Dimethylaniline After Before 6 MIN Figure : Analysis of Bases Before and After Exposure to.8l of ph 0.9 at 90 C
Highly Reproducible Columns Six physical properties are monitored for each batch of silica and bonded phase manufactured to ensure reproducibility of retention and column efficiency, as shown in Figures and. Surface area Pore size Carbon load Mean particle size Particle size distribution Full BET adsorption and desorption isotherm A series of chromatographic tests are also run on the base silica as well as bonded phases to ensure reproducibility. The HyPURITY C8 media has a total of six chromatographic tests probing the nature of the surface, and are further explained on page 7. α Acetylprocainamide / Propionylprocainamide α Diazepam / Oxazepam α Di-n-Propylphthalate / Di-isopropylphthalate figure. Enhanced Column Stability at ph 0.6 Figure : Enhanced Column Stability at ph 0.6 HyPURITY C8, µm, 0x.6mm Part No.: 0-60 Gradient: - 00% B in min. A: 0.% Ammonia in H O B: 0.% Ammonia in ACN Carbon Load Break Down by Year Figure : Excellent Reproducibility of Carbon Load on µm HyPURITY C8 media Pore Diameter Break Down by Year Figure : Median Pore Diameter for HyPURITY Silica (Å)
HyPURITY HPLC Columns HyPURITY Column Selection Table : Choosing the Appropriate HyPURITY Column The choice of the appropriate column for a particular application can be a daunting task. With a range of bonded phases offering different selectivity, the HyPURITY family includes columns to meet most separation needs, including LC/MS compatibility. The chart (Table ) will help you choose the best HyPURITY column for a particular application. The HyPURITY column chosen for a particular analysis will depend very much on the analytes present in the sample, operating conditions, and the selectivity required. Selectivity is controlled by the nature of the stationary phase and the interactions of analytes with the media surface and mobile phase. If you change the surface chemistry of the stationary phase, the selectivity changes. For example, an acidic polar analyte that shows little to no retention using a traditional alkyl chain column may be retained using a column with enhanced polar character where polar groups in the stationary phase offer another type of interaction, such as seen with HyPURITY ADVANCE columns. Selectivity changes between column packing materials due to changes in the interaction mechanisms predominantly manifest in two ways; either by a change in elution order, by a change in peak separation, or both. In most cases, selectivity changes are a combination of both these factors. This is illustrated in Figure where the peak elution and separation between peaks is changed by moving from a C8 to a polar embedded phase. The different selectivity achievable from six HyPURITY column chemistries is demonstrated in Figure 6. The same dimension of column, test mix and analysis conditions were used with each column. The test mix components are steroids with similar structure. By polar end-capping the alkyl C8 chain, the resolution between peaks HyPURITY ADVANCE, µm, 0x.6mm Part No.: 00-60 Eluent: 98% mm Acetic Acid / % MeOH Flow Rate: ml/min Detector: UV @ Temperature: C and is drastically improved as seen in the comparison of HyPURITY C8 and HyPURITY AQUASTAR columns. By adding a polar embedded group to the alkyl chain, changes in selectivity are possible as illustrated by comparing HyPURITY C8 and HyPURITY ADVANCE columns. HyPURITY C8, µm, 0x.6mm Part No.: 0-60 Eluent: 98% 0.7mM Acetic Acid / % MeOH Flow Rate: ml/min Detector: UV @ Temperature: C. Isonicotinic acid amide Nicotinic acid amine. Nicotinic acid Isonicotinic acid Figure : Elution Order Changes Possible using Phases with Alternative Selectivity
Selectivity Changes HyPURITY C8 Part No.: 0-60 6 HyPURITY AQUASTAR Part No.: 0-60 6 7 7 Increased Retention HyPURITY C8 Part No.: 0-60 HyPURITY C Part No.: 0-60 6 6 7 HyPURITY ADVANCE Part No.: 00-60, HyPURITY Cyano Part No.: 80-60 6 6 7 Selectivity Changes 7 7 Solutes:. Cortisone. Hydrocortisone. Hydrocortisone Acetate. -a-hydroxyprogesterone. 7-a-Hydroxyprogesterone 6. Progesterone 7. Unknown All Columns µm, 0x.6mm Gradient: A: H O + 0.% formic acid B: MeOH to 00%B in min., hold min. Flow Rate:.0mL/min Detector: 0nm (scan 0 to 00nm) Injection Vol.: µl (0ng/L solution in H O/ACN) System: Finnigan Surveyor HPLC with column switcher Figure 6: Selectivity and Retention Time Differences with Various HyPURITY Phases Alternative selectivity, including a change in peak elution order, is something that can prove of benefit when two peaks of a chromatogram coelute or elute very closely. Often the separation of such peaks requires that chromatographic conditions be drastically changed and/or the column chemistry modified. The examples shown in Figures 7 and 8 demonstrate the usefulness of alternative selectivity. Alternative selectivity, which may reduce retention, may offer an opportunity to achieve higher sample throughput by means of a decrease in analysis times.
HyPURITY HPLC Columns. Dinitolmide. -amino-,-dinitrobenzamide. Nitromide. Ethopabate HyPURITY AQUASTAR, µm, 0x.6mm Part No.: 0-60 Eluent: A: H O B: MeOH Gradient: to 80% B over 0 minutes Flow Rate: ml/min Detection: UV @ 60 nm Temperature: C. Benzoic Acid. Sorbic Acid Peaks & resolved HyPURITY C8, 80:0 mm KH PO ph.:acn HyPURITY ADVANCE, 80:0 mm KH PO ph.:acn Flow Rate: ADVANCE:.mL/min C8:.0mL/min Wavelength: nm Temperature: C Peaks & co-elute / 0. 7. min HyPURITY ADVANCE 0 0 min HyPURITY C8 Figure 7: Enhanced Separation of Structurally Similar Drugs Figure 8: Separation of Analytes Improved by Adding Polar Character to the Column Increased Sensitivity with µm Columns Quantitation of trace components in complex mixtures is generally performed by measurement of peak height, so the chromatographic separation needs to produce sharp, efficient peaks. The accuracy and sensitivity of the analysis is therefore determined by parameters such as particle size. Peak efficiency increases with a decrease in the particle diameter. Figure 9 illustrates the effect of the particle size (µm versus µm HyPURITY C8) for the analysis of a parent drug and three related substances. Maintaining all the analysis conditions constant, the increase in peak height with the µm column is, and % for peaks, and respectively. Therefore, the related substances present at trace levels in this drug were more accurately quantified when the µm column was used. HyPURITY C8, µm, 0x.mm Part No.: 0-0 HyPURITY C8, µm, 0x.mm Part No.: 0-0 Eluent: A: 0 mm KH PO, ph., in 0/90 v/v ACN/H O B: 0 mm KH PO, ph. in 60/0 v/v ACN/H O Gradient: Time (min) %B 0 0 0 0 70 00 Flow Rate: 0.mL/min Figure 9: Increased Sensitivity using a Smaller Particle Size 6
HyPURITY C8 Columns Introduction HyPURITY C8 columns are based on the latest in silica technology HyPURITY silica, which has less than 0ppm total metals and is exceptionally stable at low ph. The HyPURITY silica manufacturing process ensures reproducibility and quality. The homogeneous surface leads to uniform bonding coverage and eliminates silanolanalyte interactions that cause poor peak shapes for bases, acids and chelating compounds. The 90Å pore size and excellent mass transfer properties of HyPURITY C8 makes it ideal for chromatography of large peptides, as well as small molecules, with unbeatable peak shape for all sample types. The ultimate in chromatographic validation Rigorously quality tested throughout manufacturing process First-class efficiency and performance Highly reproducible, rugged and robust Ideal for LC/MS applications Extensive Chromatographic Testing HyPURITY silica and bonded phases are subject to extensive quality assurance testing to probe the chemical, physical and chromatographic nature of the media. The physical testing of the media reveals only some of the characteristics of the column. The actual chromatography obtained on a wide range of analytes fully characterizes the chromatographic surface of the HyPURITY C8 media. The chromatographic probes employed are designed to cover the broad range of possible analyte/stationary phase surface interactions, and have been chosen only after an in-depth literature survey and extensive consultation.table lists the tests performed on each batch of HyPURITY C8 after the final media production stage to ensure full characterization and ultimate performance. This wide range of tests ensures the outstanding reproducibility of both the base silica and bonded phase. Test Characteristic Tested Method Steric Selectivity Polyaromatics Bonded Phase Uniformity Relative Retention of Shape Differentiated Hydrophobicity Hydrophobic Character & Surface Coverage Retention & Selectivity of Non-Polar of Bonded Phase Hydrocarbons Hydrogen Bonding Capacity Measure of Activity of Residual Silanols Selectivity of Caffeine Relative to Phenol at Silica Surface Ion Exchange Capacity at ph.7 Presence of Active Ion Exchange Sites Benzylamine Retention Ion Exchange Capacity at ph 7. Presence of Active Ion Exchange Sites Benzylamine Retention & Dissociated Silanol Sites Analysis of Bases at ph 7 Effect of Dissociated Silanols on Basic Peak Shape & Selectivity Parameters of Tricyclic Analytes Antidepressants Analysis of Acids & Chelators Metal/Silanol Sites & Analyte Selectivity Peak Shape & Selectivity Parameters of Acids & Sensitivity to Changes in Surface Silanol Chelators Content Table : Chromatographic Validation Tests Conducted on HyPURITY C8 columns Hydrophobic Parameters Hydrophobic Retention = k (Amylbenzene) Hydrophobic Selectivity = 0. (α / / α / ) Hydrophobicity Index = k (Amylbenzene) x %C Specific Surface Area Steric Parameters Ratio of capacity factors α = k (Triphenylene) k (o-terphenyl) HyPURITY C8, µm, 0x.6mm Part No. 0-60 Eluent: 80% MeOH / 0% H O Flow Rate:.0 ml/min Detector: UV @ Steric Selectivity Break Down by Year Figure : Reproducibility of HyPURITY C8 Columns as shown by Steric Selectivity 6. Uracil. Propylbenzene. Butylbenzene. o-terphenyl. Amylbenzene 6. Triphenylene H-00 Steric Selectivity and Hydrophobicity Steric selectivity is the ability of the stationary phase to recognize and differentiate between molecules with similar molecular formulas but different shapes. It is often indicative of the surface coverage of the bonding chemistry and also provides a characteristic by which different HPLC packings can be compared. The hydrophobicity index provides an indication of the hydrophobic character of the column per unit area. Figure 0: Hydrophobic Retention Reliability on a Lot-to-Lot Basis 7
HyPURITY HPLC Columns Hydrogen Bonding Capacity The function of this test is to provide a measure of the activity of the residual silanol groups on the silica surface. Residual silanol groups are not shielded by the C8 alkyl ligand and are available to form hydrogen bonds with analytes. Caffeine is prone to such bonding and is therefore used as the test probe (Figure ). HyPURITY C8 columns have an exceptionally low hydrogen bonding capacity, indicating that there are minimal residual silanols present on the silica surface that are available for unwanted secondary interactions. Ion Exchange Capacity The retention of protonated amines at ph.7 is used to determine the level of ion exchange sites on the silica surface. The majority of the silanol groups (Si-OH) are undissociated at this ph and therefore do not contribute to the retention of protonated amines. Acidic silanols remaining on the silica surface will be in the ionized form (SiO-). These acidic silanols contribute to the retention of protonated amines by an ion exchange mechanism. At ph 7.6, all of the surface silanol groups are dissociated to form ion exchange sites that increase the retention of protonated amines. To accurately determine the ion exchange capacity of a bonded phase, retention of amines should be measured at both high and low ph. HyPURITY C8 columns possess minimal ion exchange sites at both high and low ph and so are ideal for use at extended ph and with analytes in the protonated form. The careful monitoring of ion exchange capacity ensures reproducible column performance. HyPURITY C8, µm, 0x.6mm Part No. 0-60 Eluent:70% H O / 0% MeOH Flow Rate:.0 ml/min Detector:UV @. Uracil. Caffeine. Phenol Hydrogen Bonding α Break Down by Year Figure : Hydrogen Bonding Capacity on HyPURITY C8 Columns Measured as the Separation Factor between Caffeine and Phenol H-00 0. 7. MIN Figure : Hydrogen Bonding Capacity HyPURITY C8, µm, 0x.6mm Part No. 0-60 Eluent: 70% 0mM KH PO / 0% MeOH Flow Rate:.0 ml/min ph.7 Detector: UV @ ph 7.6 0 6 8 MIN. Uracil. Benzylamine. Phenol H-00 H-00 0 6 9 MIN Analysis of Bases at ph 7 Tricyclic antidepressants (TCAs) are difficult to chromatograph with good peak shape. They are highly basic compounds that can often produce severe peak tailing or irreversibly adsorb to the media surface, particularly at ph 7. The use of this sensitive test on HyPURITY C8 columns ensures the highest standard of reproducibility for selectivity and peak shape for the analysis of basic compounds. The high surface coverage of the bonded phase and minimal ion exchange interactions contribute to the outstanding peak shape and chromatographic performance as illustrated in Figure. Figure : Ion Exchange Tests at ph.7 and 7.6 8
HyPURITY C8, µm, 0x.6mm Part No. 0-60 Eluent: 0% mm K HPO, ph 7/0% ACN Flow Rate:.0 ml/min Detector: UV @ 6 HyPURITY C8, µm, 0x.6mm Part No. 0-60 Eluent: 70% 0.M H PO / 0% ACN Flow Rate:.0 ml/min Detector: UV @ HyPURITY C8, µm, 0x.mm Part No. 0-00 Eluent: A: ACN, B: H O Gradient: to 0% ACN over 0 minutes Flow Rate:.mL/min Detection: MS, 00 C,.kV, 8V Scan: 0-0.min +APCI, 0.-min -APCI. Uracil. Protriptyline. Nortriptyline. Doxepin. Imipramine 6. Amitriptyline 7. Trimipramine H-009. Uracil. Benzyl Alcohol.,7-Dihydroxynaphthalene. -Nitrobenzoic Acid.,-Dihydroxynaphthalene 6. Chlorocinnamic Acid. Serotonin. Dopamine. Dopac. -HIAA 7 6 H-000 0 0 MIN Figure : Excellent Peak Shape of Basic Compounds 0 0 0 MIN Figure 6: Outstanding Peak Shape for Acids, Alcohols and Chelating Compounds Figure 7: High Throughput Fast Analysis using Short Columns Analysis of Acids, Alcohols and Chelators Surface metal interactions can cause changes in selectivity or peak shape for chelating solutes. The presence of metal ions can be attributed not only to the base silica but also can be traced to the column hardware, such as frits. This only happens if the column is stored in a solvent that will promote leaching such as a strong acid or base. This test probes the variability of the HyPURITY surface by determining the presence of metal ions. Comparison of peak symmetry of two regioisomers,,- and,7- dihydroxynapthalene is monitored. The former chelates while the latter does not. Acids and alcohols are also included in this test mixture to illustrate the applicability of the HyPURITY C8 media to a range of analytes where both chelating and hydrogen bonding secondary interactions are possible. Without careful control of the media surface, these interactions can change the overall selectivity and performance in terms of peak shape. This test gives the chromatographer confidence in the lot-to-lot reproducibility of the HyPURITY C8 media. The excellent peak shapes achievable make HyPURITY C8 columns the ideal choice for use with demanding LC/MS applications (Figure 8). Mobile phase modifier compatibility and its enhanced stability and lifetime make HyPURITY C8 columns the best all-round choice for LC/MS method development. (i) 0(S)-protopanaxadiols (ii) 0(S)-protopanaxatriols Figure 9: Structure of Ginsenosides HyPURITY C8, µm, 00x.mm Part No. 0-00 Instrument: Finnigan TSQ Quantum Discovery Triple Quadrupole MS and Finnigan Surveyor Detection / MS Pump Eluent: A: 0.% Formic Acid (aq) B: 0.% Formic Acid (ACN) Gradient: 0 to 70% B over 0 min Flow Rate: 00µL / min different 0(S)- protopanaxadiols and 0(S)- protopanaxatriols (active ginsenosides) Figure 8: Analysis of Ginseng Ginsenoside R R Mass Ginsenoside R R Mass Rb Glc(β-)Glc Glc(β-6)Glc 08.6 Re Rha(α-)Glc Glc 96. Rb Glc(β-)Glc Ara(pyr)(α-6)Glc 078.6 Rf Glc(β-)Glc HY 800. Rc Glc(β-)Glc Ara(fur)(α-6)Glc 078.6 Rg Glc Glc 800. Rd Glc(β-)Glc Glc 96. 9
HyPURITY HPLC Columns HyPURITY ADVANCE Columns Introduction HyPURITY ADVANCE media is a reversed phase material with polar embedded groups close to the silica surface. These groups block surface silanols from interacting with polar analytes, and also provide alternative selectivity compared to C8 and C8 phases. HyPURITY ADVANCE columns offer improved chromatographic performance with broad applicability and improved peak shape. A polar embedded stationary phase for alternate selectivity Ideal for high throughput fast analyses Enhanced aqueous stability Exceptional peak shape for acids, bases and chelators Silica surface Polar Group C8 Chain Hydrophobic Interaction Dipole Dipole N' R Positive Repulsion Alternative Selectivity through Alternative Retention Mechanisms Multiple interactions occur between analytes and the HyPURITY ADVANCE bonded phase to determine selectivity. The C8 chain portion of the HyPURITY ADVANCE media retains analytes according to the hydrophobic interactions that occur in standard reversed phase chromatography. In addition, dipoledipole interactions occur between the polar embedded group and the polar compounds. Retention mechanisms for HyPURITY ADVANCE columns are illustrated in Figure 0. The unique polar embedded chemistry of HyPURITY ADVANCE columns can also act to positively repel ionized basic species, resulting in excellent peak shape for these typically problematic compounds. The additional interactions shown may result in a change of elution order for some compounds when compared to a C8 or C8 phase. Figure 0: HyPURITY ADVANCE Retention Mechanisms. Doxepin. Imipramine. Amitriptyline. Nortriptyline Eluent: 0mM K HPO ph7 : ACN Detection: UV @ mm Flow Rate:.0mL/min Temperature: C 60:0 0mM KH PO ph7:acn HyPURITY ADVANCE 0:0 0mM KH PO ph7:acn HyPURITY C8 Figure : Improved Selectivity using HyPURITY ADVANCE Columns 0
Changes in elution order can also result from changing the organic solvent in the mobile phase. As in the example shown in Figure, using methanol causes the coelution of peaks and, but by changing to acetonitrile, peaks and separate. Outstanding Sample Throughput HyPURITY ADVANCE columns are designed to provide high sample throughput. Fast analyses use less solvent and their turnaround time is shorter, therefore providing an overall decrease in the real cost per sample analysis. Mobile Phase: 6:8 0.% H PO :AOH HyPURITY ADVANCE using methanol Mobile Phase: 6:8 0.% H PO :ACN HyPURITY ADVANCE using acetonitrile Flow:.0mL/min Wavelength: nm Temperature: C. T o. Furizolidone. Oxolinic acid. Nalidixic acid Figure : Selectivity Changes by Changing Organic Solvent Not all polar embedded phases are the same. The polar group and the attached alkyl ligand often differ and so result in different elution profiles for the same analytes under the same. Using a HyPURITY ADVANCE column, the analysis time for a basic analyte mixture can be reduced by almost 0% without compromising baseline resolution and performance. Figure : Similar Polar Embedded Chemistries Generate Markedly Different Results
HyPURITY HPLC Columns Enhanced Peak Shape The embedded polar group within the alkyl chain in HyPURITY ADVANCE columns inhibits secondary interactions between the analyte and any silanol groups present at the silica surface. This results in exceptional peaks shapes for a wide variety of compounds as shown in Figures and. This polar group also inhibits water molecules from collapsing the alkyl chains and causing a loss of column performance in highly aqueous mobile phases. Guard Column: HyPURITY C8, µm, 0xmm Analytical Column: HyPURITY ADVANCE, µm, 0x.6mm Eluent: A: ACN B: mm NaH PO, ph.8 with H PO Gradient: Time: %B 0 90 6. 70 0 Flow Rate:.0mL/min. Cocaine Detection: UV @ 0nm Temperature: C Courtesy: Laboratoire Ace, 708, Paris Figure : Excellent Peak Shape for Basic Compounds HyPURITY ADVANCE Part No.: 00-60 Eluent: 6: 0mM KH PO ph.:meoh Flow Rate:.0mL/min Detection: UV @: 0nm Temperature: C Competitor. Maleic acid. Phthalic acid. -Hydroxybenzoic acid. Isophthalic acid. Salicylic acid Figure : Excellent Peak Shape for Acidic Compounds
HyPURITY AQUASTAR Columns Introduction HyPURITY AQUASTAR columns are a silicabased polar end-capped C8 that is designed to offer superior retention of polar compounds and increased sensitivity in 00% aqueous conditions. The robust nature of the bonded phase results in a column that is ideal for HPLC and LC/MS applications. This next generation column also offers unmatched batch reproducibility over previous polar end-capped columns. Increased retention of polar compounds Chromatographic improvements over end-capped C8 Optimized for LC/MS applications Unaffected by 00% aqueous conditions Ideal for critical pairs analyses Increased Polar Analyte Retention Dispersive interactions are the primary mechanism of retention in traditional alkyl chain columns. Secondary interactions are usually associated with residual silanols and can be reduced by the use of end-capping, high purity silica and increased density of the derivatized ligand. With HyPURITY AQUASTAR columns, dispersive interactions are reduced but still play a major role in retention of both polar and non polar compounds. The additional of polar end-capping provides a controlled level of secondary interaction to give an additional mechanism by which polar compounds can be retained. This additional mechanism often will result in quite different selectivity or retention behavior over the more traditional C8 packing materials. Chromatographic Improvements Changing to an MS-friendly buffer allows analyses to easily transfer from UV detection to MS detection. The analysis time on HyPURITY AQUASTAR is roughly 0% of that on HyPURITY C8, allowing higher sample throughput and reduced solvent costs as seen in Figure 7. Compounds that are rich in nitrogen and chlorine such as pesticides, often exhibit poor peak shape on traditional C8 columns. The peak shape is dramatically improved using HyPURITY AQUASTAR and the requirement for complex gradients diminished (Figure 8). HyPURITY AQUASTAR, µm, 0x.6mm Part No. 0-60 Eluent: 0% 0mM KH PO, ph / 60% ACN Flow Rate:. ml/min Detector: UV @ nm Temperature: C HyPURITY AQUASTAR, µm, 0x.6mm Part No. 0-60 Eluent: 6% H O + 0.% Formic Acid / 8% ACN Flow Rate:.0 ml/min Detection: UV @ nm Temperature: C HyPURITY C8, µm, 0x.6mm Part No.: 0-60 Eluent: 6% 0.% H PO / 8% MeOH Flow Rate:.0 ml/min Detection: UV @ nm Temperature: C. Acetylsalicylic Acid. Naproxen. Fenoprofen. Ibuprofen. Furazolidone. Oxolinic acid. Nalidixic acid H-00 0 MIN Figure 6: Impressive Polar Analyte Retention on a Silica-Based Column H-0 H-0008 0. MIN 0 6 9 MIN Figure 7: Higher Productivity Achievable using a Polar End-Capped Column HyPURITY AQUASTAR, µm, 0x.6mm Part No.: 0-60 Eluent : 97% MeOH / % H O + 0.% TFA Flow Rate: 0.7 ml/min Detection: UV @ nm Temperature: C. Prometryn. Tebuthiuron. Atrazine. Propazine. Propanil 6. Chlorthal Dimethyl 6 H-008 0 0 MIN Figure 8: Good Peak Shape for Nitrogen and Chlorine Rich Analytes
HyPURITY HPLC Columns Structurally similar analytes such as cephalosporin antibiotics can be separated using a simple solvent mixture on HyPURITY AQUASTAR columns as shown in Figure 9. HyPURITY AQUASTAR, µm, 0x.6mm Part No.: 0-60 Eluent : 6% H O + 0.% Formic Acid / 8% ACN Flow Rate:.0 ml/min Detection: UV @ nm Temperature: C H-0 0. 7. MIN Figure 9: Enhanced Performance in Separation of Closely Related Analytes Analyses in 00% Aqueous Conditions The wetting characteristic of a media in highly aqueous conditions can be increased by the addition of polar functionality. The polar end-capping of the HyPURITY AQUASTAR phase allows it to be used for routine analysis in 00% aqueous conditions without the risk of phase collapse, and the resulting decrease in performance. Sample. Deoxycytidine. Hypoxanthine. Xanthine. Inosine. Deoxyinosine 6. Xanthosine HyPURITY AQUASTAR, µm, 0x.6mm Part No.: 0-60 Eluent: 0mM KH PO, ph. Flow Rate:.0 ml/min Detection: UV @ nm Temperature: C H-00 6 0 0 0 min Figure 0: No Phase Collapse in 00% Aqueous Conditions
µm HyPURITY Columns Description Length (mm).6 mm ID.0 mm ID.0 mm ID. mm ID.0 mm ID HyPURITY C8 0 0-060 0-000 0-000 0-00 0-000 0 0-060 0-000 0-000 0-00 0-000 00 0-060 0-000 0-000 0-00 0-000 0-60 0-00 0-00 0-0 0-00 0 0-60 0-00 0-00 0-0 0-00 00 0-060 0-000 0-000 0-00 0-000 0 0-60 0-00 0-00 0-0 0-00 HyPURITY C8 0 0-060 0-000 0-000 0-00 0-000 00 0-060 0-000 0-000 0-00 0-000 0 0-60 0-00 0-00 0-0 0-00 0 0-60 0-00 0-00 0-0 0-00 HyPURITY C 0 0-060 0-000 0-000 0-00 0-000 00 0-060 0-000 0-000 0-00 0-000 0 0-60 0-00 0-00 0-0 0-00 0 0-60 0-00 0-00 0-0 0-00 HyPURITY Cyano 0 80-060 80-000 80-000 80-00 80-000 00 80-060 80-000 80-000 80-00 80-000 0 80-60 80-00 80-00 80-0 80-00 0 80-60 80-00 80-00 80-0 80-00 HyPURITY ADVANCE 0 00-060 00-000 00-000 00-00 00-000 00 00-060 00-000 00-000 00-00 00-000 0 00-60 00-00 00-00 00-0 00-00 0 00-60 00-00 00-00 00-0 00-00 HyPURITY AQUASTAR 0 0-060 0-000 0-000 0-00 0-000 00 0-060 0-000 0-000 0-00 0-000 0 0-60 0-00 0-00 0-0 0-00 0 0-60 0-00 0-00 0-0 0-00 Other column dimensions and hardware designs are available. Please call Customer Service for more information. To order standard columns with intergral guard (COLUMNPLUS Guard or CPG), please change the last digits of the part number above to. µm HyPURITY Drop-In Guard Cartridges Description Length (mm).6 mm ID.0 mm ID.0 mm ID. mm ID.0 mm ID HyPURITY C8 0 0-000 0-000 0-000 0-00 0-000 HyPURITY C8 0 0-000 0-000 0-000 0-00 0-000 HyPURITY C 0 0-000 0-000 0-000 0-00 0-000 HyPURITY Cyano 0 80-000 80-000 80-000 80-00 80-000 HyPURITY ADVANCE 0 00-000 00-000 00-000 00-00 00-000 HyPURITY AQUASTAR 0 0-000 0-000 0-000 0-00 0-000 UNIGUARD Direct-Connect Drop-in Guard Cartridge Holder 80-00 80-00 8-00 8-00 8-00 µm HyPURITY Columns Description Length (mm).6 mm ID.0 mm ID.0 mm ID. mm ID.0 mm ID HyPURITY C8 0 0-060 0-000 0-000 0-00 0-000 0 0-060 0-000 0-000 0-00 0-000 00 0-060 0-000 0-000 0-00 0-000 0-60 0-00 0-00 0-0 0-00 0 0-60 0-00 0-00 0-0 0-00 HyPURITY ADVANCE 0 00-060 00-000 00-000 00-00 00-000 0 00-060 00-000 00-000 00-00 00-000 00 00-060 00-000 00-000 00-00 00-000 0 00-60 00-00 00-00 00-0 00-00 HyPURITY AQUASTAR 0 0-060 0-000 0-000 0-00 0-000 0 0-060 0-000 0-000 0-00 0-000 00 0-060 0-000 0-000 0-00 0-000 0 0-60 0-00 0-00 0-0 0-00 Other column dimensions are available. Please call customer service for more information. To order standard columns with intergral guard (COLUMNPLUS Guard or CPG), please change the last digits of the part number above to. µm HyPURITY Drop-In Guard Cartridges Description Length (mm).6 mm ID.0 mm ID.0 mm ID. mm ID.0 mm ID HyPURITY C8 0 0-000 0-000 0-000 0-00 0-000 HyPURITY ADVANCE 0 00-000 00-000 00-000 00-00 00-000 HyPURITY AQUASTAR 0 0-000 0-000 0-000 0-00 0-000 UNIGUARD Direct-Connect Drop-in Guard Cartridge Holder 80-00 80-00 8-00 8-00 8-00
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