Xem 1-6 trên 6 kết quả Enantiomer analysis
  • Although the technologies on chiral/enantiomer separation and stereoselective analysis have matured in the past ca. 20 years, the development of new, even more advanced chiral separation materials, mechanisms and methods still belong to the more challenging tasks in separation science and analytical chemistry. An analysis of recent trends indicates that capillary electrophoresis (CE) can show real advantages over chromatographic methods in ultratrace chiral determination of biologically active ionogenic compounds in complex matrices, including mostly biological ones....

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  • the beginning, medicinal therapy consisteodf concoctions coadministered with incantations. Little thought was given to dissecting out the contributions of the pharmacology of the concoction from the spiritual consequences of the incantations. Eventually, potions and extracts were recognized to have predictable activity that could be observed and described objectively. Then came the capacity to estimate potency,t o l eading concentration and purification.

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  • Tham khảo sách 'drug stereochemistry analytical methods and f'hannacology second edition_1', y tế - sức khoẻ, y học thường thức phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The increasing awareness of the importance of chirality in the context of biological activity has stimulated a growing demand for efficient methods for industrial synthesis of pure enantiomers including chiral antiinflammatory drugs such as naproxen (Xin et al., 2001) and ibuprofen (Lee et al., 1995; Ducret et al., 1998; Xie et al., 1998; Arroyo et al., 1999; Chen and Tsai, 2000); antihypertensive agents such as angiotensin-converting enzyme (ACE) inhibitors (e.g., captopril, enalapril, ceranopril, zofenapril, and lisinopril); and the calcium channel- blocking drugs such as diltiazem.

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  • The substrate selectivity and enantioselectivity of Solanum tuberosum epoxide hydrolase 1 (StEH1) have been explored by steady-state and pre-steady-state measurements on a series of styrene oxide derivatives. A prefer-ence for the (S)- or (S,S)-enantiomers of styrene oxide, 2-methylstyrene oxide andtrans-stilbene oxide was established, with E-values of 43, 160 and 2.9, respectively.

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  • Recombinant glycerol dehydratase ofKlebsiella pneumoniae was purified to homogeneity. The subunit composition of the enzyme was most probablya2b2c2 .When(R)- and (S)-propane-1,2-diolswere used independently as substrates, the rate with the (R)-enantiomer was 2.5 times faster than that with the (S)-isomer. In contrast to diol dehydratase,an iso-functional enzyme,the affinity of the enzyme for the (S)-isomer was essentially the same or only slightly higher than that for the (R)-isomer (Km(R) /Km(S) ¼1.5). ...

    pdf11p research12 23-04-2013 9 1   Download

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