Add time:08/16/2019         Source:sciencedirect.com

The stereospecificity of chloramphenicol isomers on the inhibition of several plant systems was investigated. l-Threo, d-erythro, l-erythro and the antibiotic d-threo-chloramphenicol were effective inhibitors of auxin-induced elongation, 14C-leucine uptake and 14C-leucine incorporation into the protein fraction of coleoptiles from Avena sativa and Triticum vulgare. The isomers also inhibited Avena coleoptile uptake of 14C-α-aminoisobutyric acid and the de novo synthesis of α-amylase by aleurone layers from Hordeum vulgare seeds. All four compounds inhibited these processes to about the same extent and over a similar high concentration range (5 × 10−4 to 5 × 10−3 M). Bioassay of extracts from Avena coleoptiles treated with the non-antibiotic isomers revealed no tissue conversion into d-threo-chloramphenicol.

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