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Natural Product Research
Formerly Natural Product Letters
Volume 33, 2019 - Issue 5
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Short Communication

Assessment of the bioactive compounds, antioxidant and antibacterial activities of Isodon rubescens as affected by drying methods

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Pages 746-749 | Received 01 Jun 2017, Accepted 09 Nov 2017, Published online: 26 Nov 2017
 

Abstract:

The influence of natural drying (ND), hot-air drying (HD), vacuum drying (VD), infrared drying (ID) and freeze drying (FD) on bioactive compounds and bioactivities of Isodon rubescens (Hemsl.) was investigated in this study. The results showed that different drying methods resulted in the differences in bioactive compositions’ content, antioxidant and antibacterial activities of extracts from I. rubescens. FD sample possessed the highest content of total phenolics, total flavonoids and several main phenolic compounds, as well as the stronger antioxidant and antibacterial activities, followed by ND, HD and VD, the lowest for ID samples. For this reason, freeze drying would seem to be more advisable for the drying I. rubescens, and future studies could focus on the quality evaluation and optimising various drying parameters.

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