Effect of heat processing on the chemical constituents and NO-suppressing activity of Bletilla Tuber

In this study, we compared the chemical constituents of well-processed Bletilla Tuber (BT1) and normally processed Bletilla Tuber (BT2) derived from the same origin. In addition, as an indicator of the hemostatic activity of Bletilla Tuber, the NO inhibitory activities of extracts obtained from BT1 and BT2 and the isolated compounds were examined. As a result of LC –MS analysis, three types of compounds, glucosyloxybenzyl 2-isobutylmalates, bibenzyl derivatives and phenanthrene derivatives, were detected. Comparison of the chemical profiles of the extracts indicated that the relative contents of glucosyloxybenzyl 2-isobutylmalates had changed by heat process ing, whereas the relative contents of bibenzyls and phenanthrenes had not changed. The extracts of BT1 and BT2 showed similar IC50 values on NO production suppressing activity. Furthermore, phenanthrenes and bibenzyls were identified as the compounds responsible for suppressing the NO activity. These results suggest that the biological activities, such as the anti-inflammatory and hemostatic activities, of Bletilla Tuber are not affected by heat processing.
Source: Journal of Natural Medicines - Category: Drugs & Pharmacology Source Type: research

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