期刊
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
卷 56, 期 4, 页码 1641-1648出版社
WILEY
DOI: 10.1111/ijfs.14784
关键词
Acidified systems; cold-set gelation; glucone-delta-lactone; Salvia hispanica L.
资金
- CONICET
- ANPCyT [PICT 2017-0937, PICT 2018-02872]
- UNR [80020190100129UR, 80020180300 078UR]
This study investigated the acid-induced aggregation and gelation of heat-treated chia protein isolates obtained at different pH levels, revealing differences in protein aggregation state and gel structure.
This work studied for the first time the acid-induced aggregation and gelation of heat-treated chia protein isolates obtained by extraction at pH 10 or 12 (CPI10 and CPI12, respectively). The aggregation state of proteins was modified during acidification. The size of the aggregates was reduced for both samples when the pH decreased but below pH 4.5 further protein aggregation took place for CPI12. Gelation of CPI12 was completed after about 30 min of acidification with glucone-delta-lactone. By contrast, this period was not enough to reach a constant value inG ' for CPI10. When gelation was ensured, confocal laser scanning micrographs from those gels revealed a coarse and irregular structure with large pores (median size of diameters: 30 mu m). Instead, micrographs from CPI12 cold gels showed a more regular and interconnected network, with smaller pores (median size of diameters: 9 mu m). These differences are consistent with a higher elastic behaviour (G(max)' = 13.6 +/- 0.1 Pa).
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