کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1185800 | 963413 | 2012 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Comparison of polarimetry and crown ether-based HPLC chiral stationary phase method to determine (l)-amino acid optical purity Comparison of polarimetry and crown ether-based HPLC chiral stationary phase method to determine (l)-amino acid optical purity](/preview/png/1185800.png)
Although various pharmacopoeias provide titration methods to assay (l)-amino acid content, none of these methods distinguish between (l)- and (d)-amino acids and do not consider the presence of enantiomeric impurities. Consequently, these methods are limited in scope to describe the relationship between content and specific rotation, [α]. In this study, the US Pharmacopoeia method was compared with the crown ether-based high performance liquid chromatographic (HPLC) chiral stationary phase (CSP) method to determine (l)-amino acid content and specific rotation. The (l)-amino acid content specified by the US Pharmacopoeia method was not consistent with the specific rotation in the presence of enantiomeric impurities, whereas the HPLC-CSP method was very effective for determining the (l)-amino acid content and the optical purity. The other advantage is that the HPLC-CSP method requires amino acid samples of quite low concentration (as low as 1 μg/mL), whereas the pharmacopoeia method requires higher concentrations (20–110 mg/mL).
► HPLC-CSP method was developed for the determination of optical purity of amino acids.
► HPLC-CSP method was compared with the polarimetry method of the US Pharmacopoeia.
► HPLC-CSP method was more effective than the polarimetry method of the US Pharmacopoeia.
► HPLC-CSP method requires amino acid samples of low concentration (as low as 1 μg/mL).
Journal: Food Chemistry - Volume 135, Issue 2, 15 November 2012, Pages 343–347