Polysaccharides from Tetrastigma hemsleyanum Diels et Gilg: optimum extraction, monosaccharide compositions, and antioxidant activity

Abstract

The optimization of extraction of Tetrastigma hemsleyanum Diels et Gilg polysaccharides (THP) using ultrasonic with enzyme method and its monosaccharide compositions and antioxidant activity were investigated in this work. Single-factor experiments and response surface methodology (RSM) were performed to optimize conditions for extraction, and the independent variables were (X_A) dosage of cellulase, (X_B) extraction time, (X_C) ultrasonic power, and (X_D) ratio of water to the material. The extraction rate of THP was increased effectively under the optimum conditions, and the maximum (4.692 ± 0.059%) was well-matched the predicted value from RSM. THP was consisted of mannose, glucuronic acid, rhamnose, galacturonic acid, glucose, galactose, and arabinose, while glucose was the dominant (26.749 ± 0.634%). According to the total antioxidant capacity assay with the FRAP method, DPPH, and hydroxyl radical scavenging assay, THP showed strong antioxidant activity with a dose-dependent behavior. The results indicated that THP has the potential to be a novel antioxidant and could expand its application in food and medicine.

Graphical Abstract

Keywords:

• Tetrastigma hemsleyanum Diels et Gilg
• polysaccharides
• response surface methodology
• optimization
• monosaccharide compositions
• antioxidant activity

Acknowledgments

We appreciate the technical and experimental support from the Public Platform of Medical Research Center, Academy of Chinese Medical Science, Zhejiang Chinese Medical University.

Disclosure statement

The authors declare no competing financial interest.

Additional information

Funding

This work was supported by the Key Research Projects of Zhejiang Traditional Chinese Medicine under Grant No. 2019ZZ009 and Zhejiang Medical Science and Technology Project under Grant No. 2020RC084.