Gelation potential of oat protein isolate: Influence of extraction method, gelling conditions, and enzymatic modification

IF 8.5 1区农林科学 Q1 CHEMISTRY, APPLIED Food Chemistry Pub Date : 2025-03-21 DOI:10.1016/j.foodchem.2025.143968

Miikka Laitinen, Tiina Kokkonen, Xin Huang, Kirsi Jouppila, Ndegwa H. Maina, Noora Mäkelä-Salmi

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Abstract

The poor technological functionality of oat protein presents a challenge in food applications. This study investigated the effect of extraction method, gelling conditions (pH and NaCl concentration), and enzymatic modification on heat-induced gelation of oat protein isolate (OPI). Fairly strong gels (G′ = 5000 Pa, tan δ = 0.26) were formed from OPI, but gelation was highly sensitive to pH and NaCl concentration. Extraction at pH ~10 negatively affected the gelation properties compared to extraction at pH 8. Partial hydrolysis with alcalase, bromelain, or papain increased the solubility of OPI but was detrimental to gelation, leading to liquid expulsion from the gel. After enzymatic deamidation with protein glutaminase, up to 87 % solubility of OPI at pH 7 was achieved, and it formed soft, elastic, and slightly translucent gels (G′ = 1100 Pa, tan δ = 0.21). The extraction process and modifications of oat proteins have a great impact on their techno-functionality and need optimization for food applications.

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来源期刊

Food Chemistry 工程技术-食品科技

CiteScore

16.30

自引率

10.20%

发文量

3130

审稿时长

122 days

期刊介绍： Food Chemistry publishes original research papers dealing with the advancement of the chemistry and biochemistry of foods or the analytical methods/ approach used. All papers should focus on the novelty of the research carried out.