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Seabuckthorn seed meal (SSM) is a waste of oil extraction industry that rich in protein. In order to seek suitable protein extraction method, three different deep eutectic solvents (DESs) (including choline chloride-glycerol, choline chloride-oxalic acid and choline chloride-urea) were developed for extracting protein from SSM and compared with alkaline. Result indicated that alkaline could effectively extract 56.9% protein from SSM and its protein content was 73.1%, higher than DES at 31.0%‒41.4% and 64.3%‒67.5%, respectively. However, compared to alkali, DES led to a product with less β-sheet, more β-turn, more essential amino acids, higher total amino acid content, especially choline chloride-urea which extracted protein showing an integrated and similar protein weight distribution compared to SSM. Also, this protein extracted chloride-urea showed a highest digestibility in vitro (by pepsin) (54.2%). These results indicated that choline chloride-urea extraction is better than alkaline extraction for SSM.


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Deep eutectic solvents and alkaline extraction of protein from seabuckthorn seed meal: a comparison study

Show Author's information Junjie LinaHuan XiangaDongxiao Sun-WaterhouseaChun Cuia,b( )Wei Wanga
College of Food Science and Technology, South China University of Technology, Guangzhou 510640, China
Guangdong Wei-Wei Biotechnology Co., Ltd, Guangzhou 510640, China

Peer review under responsibility of KeAi Communications Co., Ltd.

Abstract

Seabuckthorn seed meal (SSM) is a waste of oil extraction industry that rich in protein. In order to seek suitable protein extraction method, three different deep eutectic solvents (DESs) (including choline chloride-glycerol, choline chloride-oxalic acid and choline chloride-urea) were developed for extracting protein from SSM and compared with alkaline. Result indicated that alkaline could effectively extract 56.9% protein from SSM and its protein content was 73.1%, higher than DES at 31.0%‒41.4% and 64.3%‒67.5%, respectively. However, compared to alkali, DES led to a product with less β-sheet, more β-turn, more essential amino acids, higher total amino acid content, especially choline chloride-urea which extracted protein showing an integrated and similar protein weight distribution compared to SSM. Also, this protein extracted chloride-urea showed a highest digestibility in vitro (by pepsin) (54.2%). These results indicated that choline chloride-urea extraction is better than alkaline extraction for SSM.

Keywords: Amino acids, Deep eutectic solvent, Seabuckthorn seed meal, Protein extraction, Alkaline extraction and acid precipitation

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Publication history

Received: 17 November 2020
Revised: 04 January 2021
Accepted: 03 February 2021
Published: 28 April 2022
Issue date: July 2022

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© 2022 Beijing Academy of Food Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

Acknowledgements

Acknowledgements

The authors are grateful for the financial support from the National Natural Science Foundation of China (No. 31201416) and Science and Technology Research Program of Guangdong Province (No. 2017A01010502).

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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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