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Development of a rapid and sensitive method for determination of cysteine/cystine ratio in chemically defined media
- Source :
- Journal of Chromatography A. 1217:3863-3870
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
Abstract
- Two rapid, sensitive and quantitative methods for the determination of the cysteine and cystine ratio in complex defined media feedstock using monolithic reversed-phase liquid chromatography (RPLC) and RPLC-MS are presented. Cysteine is pre-derivatised with purified 2-chloro-1-methylquinolinium tetrafluoroborate (CMQT) and separated from other derivatisation products on a narrow-bore 50mmx2mm I.D. monolithic C(18) column with UV detection at 355nm. For reversed-phase LC (RPLC) the separation is carried out isocratically using a mobile phase of 50mM trichloroacetic acid (TCA) adjusted to pH 2.5 with lithium hydroxide (LiOH) and acetonitrile (83:14) pumped at 1.5mL/min with an elevated column temperature. For RPLC-MS an ammonium acetate and acetonitrile gradient method was developed with a reduced flow rate of 0.3mL/min. The treatment of the samples consisted of dividing them into two aliquots, the first aliquot is analysed for cysteine and the second aliquot is analysed for cystine after its quantitative reduction to cysteine using tris(2-carboxyethyl)phosphine (TCEP). Both methods are linear, with R(2)>0.999 for 0.25-500microM for cysteine and 0.25-250microM for cystine using the LC-UV method, sensitive, with detection limit of 36nM for cysteine, and precise, with < or =1.1% RSD for both retention time and peak area (n=6). Samples (n=31) of an industry standard and supplied chemically defined media feedstock were analysed, finding cysteine ranging from 1.56 to 2.26microg/mL and cystine from 1062.02 to 1348.13microg/mL.
- Subjects :
- Detection limit
Chromatography, Reverse-Phase
Spectrometry, Mass, Electrospray Ionization
Chromatography
Quinolinium Compounds
Electrospray ionization
Organic Chemistry
Cystine
Reproducibility of Results
General Medicine
Hydrogen-Ion Concentration
Sensitivity and Specificity
Biochemistry
Lithium hydroxide
Culture Media
Analytical Chemistry
chemistry.chemical_compound
chemistry
Linear Models
Cysteine
Acetonitrile
Ammonium acetate
Phosphine
Subjects
Details
- ISSN :
- 00219673
- Volume :
- 1217
- Database :
- OpenAIRE
- Journal :
- Journal of Chromatography A
- Accession number :
- edsair.doi.dedup.....2cdeca18ef24334ca59f1c5b9ecbddef