HPLC for food analysis
HPLC for food analysis
... used for various purposes in modern food processing. For example, citric acid adds a fresh, acidic flavor, whereassuccinic acid gives food a more salty, bitter taste. Inaddition to rendering foods ... Di Pietra et al., HPLC analysis of aspartame and saccharin in pharmaceutical and dietary formulations”; Chromatographia, 1990, 30, 215–219.4. Official Methods of Analysis, Food Compositions; ... characteristic. Maxima start at approximately 400 nm for yellow colors,500 nm for red colors, and 600–700 nm for green, blue, and black colors. For the analysis of all colors at maximumsensitivity...
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IMPROVEMENT OF BIOLOGICAL SOLUBILIZATION AND MINERALIZATION PROCESS FOR FOOD WASTE
... temperature. Food Wastes Artificial food waste was used to keep its properties constant. The composition of artificial food waste was determined based on a typical composition of food waste ... oxygen for the solubilization of food waste. The circulating water did not contain oxygen when aeration was not carried out in the circulation tank. Therefore, oxygen would be deficient for the ... was supplied in Run 3 than in Run 2 for the biodegradation of SS, DO was not detected just after feeding food waste while DO concentrations just before feeding food waste were less than 2 mg/l....
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Tài liệu HPLC for Pharmaceutical Scientists 2007 (Part 7A) pptx
... the most widely used systems for analysis of large bio-molecules. For a continuous ion source, the ions can be stored for a shortperiod of time and pulsed out for analysis. In the case of ESI, ... isomer differenti-ation, protein sequencing, and mixture analysis. MS/MS experiments are oftenperformed in combination with HPLC for analysis of complex mixtures.7.4 ROLE OF INSTRUMENTAL PARAMETERS ... capability of multiple-stageMS analysis for complex molecules (see the section on tandem MS). Recentinstrument development also allows facile integration of HPLC with FT-ICR for LC/MS and LC/MSnapplications...
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Tài liệu HPLC for Pharmaceutical Scientists 2007 (Part 7B) pptx
... 102].The use of MRM methods for quantitative bioanalysis often reduces samplepreparation and analysis time. The MRM method that used LC/ESI-MS/MS for the quantitative analysis of an anticancer ... metabolites areimportant biotransformation pathways for many drugs and xenobiotics [127,132, 133]. For example, the formation of acyl glucuronide conjugate forced thewithdrawal of four marketed ... intermediates for formation of the keto acid, were also observed in the radiochromatogramof rat plasma (spectrum not shown) [131].PRACTICAL APPLICATIONS 335Scheme 11. Mechanism for the formation...
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Tài liệu HPLC for Pharmaceutical Scientists 2007 (Part 8A) ppt
... veryimportant to understand the aim of analysis and the requirements for a par-ticular method to be developed. The aim of analysis of each HPLC methodmay vary for each developmental area in the ... the ACD prediction of the solubil-ity for the ionized form of bases and acids shows greater deviation than for the solubility predicted for the neutral form of the molecules.Reaction of the ... different solutions prepared at the different pHvalues. For example, in Figure 8-7 if the target concentration for the HPLC assay is 1 mg/mL for this basic compound, then the sample at pH 1 (8 mg/mL356...
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Tài liệu HPLC for Pharmaceutical Scientists 2007 (Part 8B) pdf
... in theirionic form or neutral form. This may be dependent on the type of analysis thatis required. If fast analysis is required, then analysis of the component in itsionized form may be acceptable ... by the pressure limitationof the HPLC equipment. For more information on gradient separation anddeveloping fast HPLC methods, see Chapter 17 and Practical HPLC MethodDevelopment from Synder ... determined first before exploring the retentivity and selectivity of differ-ent columns. The strategy and choice of the optimal pH for analysis was dis-cussed in Chapter 4 and is further reinforced in...
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Tài liệu HPLC for Pharmaceutical Scientists 2007 (Part 8C) pdf
... The experiments for wwpH 2–4 were performed on day1, and those for wwpH 5–7 were performed on day 2 (≈36 hr after initial prepa-ration).A further investigation was performed by preparing ... height) for peak B ≤ 1.5•Tailing factor (5% peak height) for peak A ≤ 1.5•Rt for peak A must be 12.0 ± 1.3 min•Rt for peak B must be 21 ± 1.0 min•The S/N of the LOQ solution (0.05%) for both ... degradation for generation of a systemsuitability sample is given in the literature [24].8.5.4 Case Study 1: Method Development for a Zwitterionic CompoundMethod development for the analysis...
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Tài liệu HPLC for Pharmaceutical Scientists 2007 (Part 8D) pdf
... Figure 8-40A for thesample stored in the acidic diluent for 4 days at room temperature shows somedegradation compared to Figure 8-40B for the sample stored in the acidicdiluent for one day ... analyte pKashift) for both basic ionization centers. Therefore this cor-relates with a sspKaof 2.7 for pyridinal nitrogen (i.e., 3.3 − 0.6 = 2.7) and withasspKaof 4.7 for the morpholinal ... 3.8limit plateau is observed where the analyte would be in its fully ionized form.Therefore, further analysis for this compound should be carried out at pHvalues >sspH 6.1 using no less...
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Tài liệu HPLC for Pharmaceutical Scientists 2007 (Part 8E) docx
... that was optimized by Drylab, a forced degrada-tion sample was run that was stressed at 50°C for 1 week in pH 1 diluent. Itwas noted that a major impurity was formed (Figure 8-49) and was determinedto ... isocratic conditions for deter-mining the most suitable pH for the method. The retention behavior of activeas a function of pH (isocratic) was determined. The best mobile-phase pH for further gradient ... canΠΠrLrLrr23024630460425.....-i.d.column-i.d.column-i.d.column2-i.d.column2==METHOD DEVELOPMENT APPROACHES 425be performed for further structural elucidation of the impurities. Deuteratedexperiments can be performed to support structural assignments.8.5.7 Case...
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