title: Effect of ultrasonic pretreatment on physicochemical characteristics and rheological properties of soy protein/sugar Maillard reaction products.
abstract: Maillard reaction products (MRPs) of soybean protein isolate (SPI) and sugars (glucose and maltose) were prepared by heating in the aqueous dispersion at 95 °C for 15 min with ultrasonic pretreatment (ultrasonic power of 200 W) for 20 min. Effect of ultrasonic pretreatment on physicochemical characteristics and rheological properties of SPI/sugar MRPs was investigated. SPI/sugar MRPs prepared with ultrasonic pretreatment had higher degree of glycation (DG), lower browning and less compact tertiary conformation than that with non-ultrasonic pretreatment. Surface hydrophobicity (H0), particle size and rheological properties were measured by fluorescence spectrophotometry, laser particle size analysis and dynamic oscillatory rheometry, respectively. Glycation reduced H0 and particle size as well as weaken the gel network formed by the acidification of GDL. However, ultrasound increased H0 and decreased particle size. This is desirable for the formation of acid-induced gel structure. The ultrasonic pretreatments reduced/eliminate the weakening effect of glycation on the gel network of SPI/sugar MRPs, and even improved the gel properties.
authors.affiliation: Department of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030 China.
authors.forename: Cheng-Bin
authors.initials: CB
authors.lastname: Zhao
authors.affiliation: Department of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030 China.
authors.forename: Lin-Yi
authors.initials: LY
authors.lastname: Zhou
authors.affiliation: Department of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030 China.
authors.forename: Jin-Yang
authors.initials: JY
authors.lastname: Liu
authors.affiliation: Department of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030 China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030 China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030 China.
authors.forename: Fei
authors.initials: F
authors.lastname: Wu
keywords: Maillard reaction; Rheological properties; Soybean protein; Sugar; Ultrasonic pretreatment