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Antioxidant Activity Improvement and Evaluation of Structure Changes of SHECN Treated by Pulsed Electric Field (PEF) Technology

  • Songyi Lin , Rong Liang , Jie Xing , Xingfang Li , Yali Yu EMAIL logo and Jia Wang
Published/Copyright: February 9, 2017

Abstract

The purpose of the study was to evaluate the relationship between antioxidant activity improvement and structure changes of peptide (Ser-His-Glu-Cys-Asn (SHECN) isolated from soybean treated by pulsed electric field (PEF). The two-factor-at-a–time (TFAT) was performed to investigate interaction of electric field intensity (5, 10, 15 and 20 kV/cm) and pulse frequency (1,800 and 2,400 Hz) on antioxidant activity improvement and structure changes. Compared with untreated peptide, DPPH radical inhibition of SHECN was significantly increased to 95.54 ± 0.16 % at optimal conditions (electric field intensity 15 kV/cm, pulse frequency 1,800 Hz and a retention time of 2 h). Results showed that the primary structure of SHECN had not been changed based on the nuclear magnetic resonance analysis. However, the secondary structure of peptide, especially α-helix can be changed. These results suggested that mechanism of antioxidant activity improvement is related to secondary structure changes.

Funding statement: Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-Year Plan Period, (Grant/Award Number: ‘2012BAD34B07’).

Acknowledgements

The authors acknowledge the financial support provided by the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-Year Plan Period (2012BAD34B07).

All authors participated in the design, interpretation of the studies and analysis of the data and review of the manuscript; Songyi Lin, Rong Liang, Jie Xing, Xingfang Li, Yali Yu and Jia Wang conducted the experiments, Rong Liang and Yali Yu wrote the manuscript.

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Published Online: 2017-2-9
Published in Print: 2017-3-1

© 2017 Walter de Gruyter GmbH, Berlin/Boston

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