Physicochemical characterization and antioxidant activity of polysaccharides from Chlorella sp. by microwave-assisted enzymatic extraction

Hao Peng; Xiangjin Xv; Xiangwei Cui; Yongxiang Fu; Shuqi Zhang; Guanhao Wang; Xue Chen; Wenlu Song

doi:10.3389/fbioe.2023.1264641

Physicochemical characterization and antioxidant activity of polysaccharides from Chlorella sp. by microwave-assisted enzymatic extraction

Front Bioeng Biotechnol. 2023 Aug 10:11:1264641. doi: 10.3389/fbioe.2023.1264641. eCollection 2023.

Authors

Hao Peng¹, Xiangjin Xv², Xiangwei Cui¹, Yongxiang Fu¹, Shuqi Zhang¹, Guanhao Wang¹, Xue Chen¹, Wenlu Song¹

Affiliations

¹ New Energy Research Institute, Jining University, Jining, China.
² School of Life Sciences, Yunnan University, Kunming, China.

Abstract

Microwave-assisted enzymatic extraction (MAEE) was used for the separation of polysaccharides from micro-Chlorella. The extraction condition of MAEE was optimized by Box-Behnken design and response surface methodology. Results showed that the optimal condition for the extraction of Chlorella sp. crude polysaccharides (CSCP) was at 50°C for 2.3 h with 380 W of microwave power and 0.31% of enzyme dosage. Under the optimal extraction condition, the extraction yield of CSCP reached 0.72%. Similarly, the α-amylase modification conditions of the CSCP were also optimized, in which the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging rate was used as the response value. The scavenging rate of DPPH free radicals was 17.58% when enzyme dosage was 271 U/g at 51°C for 14 min. Moreover, the enzyme-modified CSCP presented a typical heteropolysaccharide mainly including glucose (48.84%), ribose (13.57%) and mannose (11.30%). MAEE used in this work achieved a high extraction yield of CSCP, which provides an efficient method for the extraction of CSCP from Chlorella sp.

Keywords: Chlorella sp.; microwave-assisted enzymatic extraction; physicochemical characterization; polysaccharides; response surface methodology.

Grants and funding

The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was supported by the Science and Technology Support Plan for Youth Innovation of Colleges and Universities of Shandong Province (Grant Number, 2021KJ109).