Volume 46, Issue 3 e16411
ORIGINAL ARTICLE

Purification, characterization, and antioxidant activity of polysaccharides from Okara

Yanbo Hu

Yanbo Hu

School of Food Sciences and Engineering, Chang Chun University, Changchun, P.R. China

Contribution: Conceptualization, Data curation, Funding acquisition, Writing - original draft, Writing - review & editing

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Siqi Wang

Siqi Wang

School of Food Sciences and Engineering, Chang Chun University, Changchun, P.R. China

Contribution: Data curation, Formal analysis, ​Investigation, Methodology

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Zenghui Shi

Zenghui Shi

School of Food Sciences and Engineering, Chang Chun University, Changchun, P.R. China

Contribution: Methodology, Validation

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Liyuan Zhai

Liyuan Zhai

School of Food Sciences and Engineering, Chang Chun University, Changchun, P.R. China

Contribution: ​Investigation, Methodology, Resources

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Jingyi Fu

Jingyi Fu

School of Food Sciences and Engineering, Chang Chun University, Changchun, P.R. China

Contribution: ​Investigation, Methodology

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Jun Zhao

Corresponding Author

Jun Zhao

School of Food Sciences and Engineering, Chang Chun University, Changchun, P.R. China

Correspondence

School of Food Sciences and Engineering, Chang Chun University, Changchun, P.R. China.

Email: [email protected]

Contribution: Conceptualization, Funding acquisition, Resources, Supervision, Writing - review & editing

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First published: 27 January 2022
Citations: 9

Yanbo Hu and Siqi Wang contributed equally to this work.

Abstract

A neutral polysaccharide (SSPS-N) and an acidic polysaccharide (SSPS-A) were isolated from Okara by anion-exchange chromatography. The physical and chemical properties of polysaccharides were studied by HPLC, FT-IR, and SEM. The results showed that SSPS-N might be a galactomannans with a lamella-like structure, and SSPS-A might be an arabinogalactan with a complete porous structure. Furthermore, a new neutral soybean soluble polysaccharide (SSPS-N-b) with a molecular weight of 8.6 kDa was isolated from SSPS-N, and its fine structure was analyzed by GC–MS, enzymatic analysis, and NMR. The results showed that SSPS-N-b was a mixture of β-1,4-galactan and glucomannan, which (1→4)-β-d-linked mannose and (1→4)-β-d-linked glucose were connected alternately, and it was in parallel with β-1,4-galactan. The antioxidant activity results showed that β-1,4-Galactan in SSPS-N-b was identified as the main activity domain. This result will be utilized for the development of SSPS as novel functional foods and medicine.

Practical applications

Soluble soybean polysaccharide is considered to be a functional component in food because of their biological activities. The physical and chemical properties and antioxidant activity of polysaccharides from Okara show potential applications in novel functional foods and medicine.

CONFLICT OF INTEREST

The authors have declared no conflicts of interest for this article.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.