Effects of high hydrostatic pressure on physicochemical and functional properties of soybean protein isolate

Abstract

Impacts of high hydrostatic pressure (HHP) pretreatment on the physicochemical, functional and antioxidant properties of soybean protein isolate (SPI) were investigated. Changes in the secondary and tertiary structures were determined by Fourier transform infrared spectra and fluorescence spectra. The particle sizes reduced from 217.20 nm to 192.70 nm while the zeta potential increased. It's revealed by scanning electron microscopy that the HHP treatment could result in the formation of large aggregation, leaving the SPI with irregular and uneven surface. Moreover, hollow spheres were also observed in SPI by means of dynamic and static light scattering. As a result, the foaming capacity of HHP-treated SPI and antioxidant activity of the HHP-treated SPI hydrolysates were improved significantly.

Exploring the Immunomodulatory Properties of Red Onion (Allium cepa L.) Skin: Isolation, Structural Elucidation, and Bioactivity Study of Novel Onion Chalcones Targeting the A2A Adenosine Receptor

“…Their structures were elucidated through the analysis of HR-ESI−MS, as well as 1D and two-dimensional (2D) NMR spectroscopic data. The known compounds were identified as furano[4″,5″:3,4]chalcone (4), quercetin (5), kaempferol (6), isorhamnetin (7), myricetin (8), isoquercitrin (9), quercetin 3,4′-O-β-Ddiglucopyranoside (10), quercetin 4′-O-β-D-glucopyranoside (11), quercimeritrin (12), quercetin 7,4′-O-β-D-diglucopyranoside (13), quercetin 3,7-O-β-D-diglucopyranoside ( 14), quercetin 3-O-β-D-rhamnoside (15), rutin (16), astragaline (17), kaempferol 4′-O-β-D-glucopyranoside (18), kaempferol 3,4′-O-β-D-diglucopyranoside (19), 3′-O-methylquercetin 3glucoside (20), isorhamnetin 4′-glucopyranoside ( 21), (2S)naringenin (22), taxifolin ( 23 (38), protocatechuic acid (39), vanillic acid (40), caffeic acid (41), ferulic acid (42), syringaresinol (43), and sinapinic acid (44) (Figure 1).…”

“…The constituents of onions vary based on their species, growth environment, and cultivation methods . Our group has long engaged in the exploration and reutilization of wastes and byproducts from the food industry. , In our continuing endeavor for bioactive substances with health benefits from red onion skin, an in-depth chemical investigation using various chromatographic techniques was carried out. As a result, three previously undescribed chalcones ( 1 – 3 ) with immunomodulatory properties targeting A 2A adenosine receptor (A 2A AR), together with 41 known compounds ( 4 – 44 ), were isolated from red onion skin.…”