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Astragali is a herbal medicine used as an adjuvant extensively in the treatment of various cancers of lung, digestive tract, urinary system, etc. Statistics-based experimental designs were applied to optimize the extraction conditions for Astragalus polysaccharides (AP). The optimum conditions were found to be: the values of extraction time 3h, ratio of liquid to solid 4 and particle size 33.8 mesh...
In order to prevent the browning of the chitooligomer product prepared from enzymatic hydrolysis, the chitooligomers were reduced by potassium borohydride. The chemical structures and physical properties of the reduced chitooligomers were characterized by magnetic resonance spectra, X-ray diffraction, UV-spectrophotometry, thermogravimetric analysis, differential thermal analysis. The chemical stability...
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