title: Dynamics of water mobility and distribution in soybean antioxidant peptide powders monitored by LF-NMR.
abstract: In this study, we aimed to elucidate the characteristics of water mobility and distribution in soybean antioxidant peptide powders (SAPPs) using low-field nuclear magnetic resonance (LF-NMR). SAPPs of three different molecular weights (MWs) were exposed to a room temperature environment with a relative humidity of 45%, and the dynamics of water mobility and distribution were monitored by LF-NMR. Results revealed that there were four transverse relaxation time fractions in SAPPs. The major (over 90%) fraction was bound water, and the distribution of water in samples with different MWs was different. The moisture absorption capacity of SAPPs with MWs of less than 1 kDa was the strongest, and all T2 fractions/water population contents in SAPPs with MWs of 1-3 kDa were the lowest. This study provided an effective real-time monitoring method for water mobility and distribution in SAPPs and may have applications for promoting peptides quality assurance.
authors.affiliation: Laboratory of Nutrition and Functional Food, Jilin University, Changchun 130062, PR China.
authors.forename: Songyi
authors.initials: S
authors.lastname: Lin
authors.affiliation: Laboratory of Nutrition and Functional Food, Jilin University, Changchun 130062, PR China.
authors.forename: Shuailing
authors.initials: S
authors.lastname: Yang
authors.affiliation: Laboratory of Nutrition and Functional Food, Jilin University, Changchun 130062, PR China.
authors.forename: Xingfang
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Food, Nutrition and Packaging Sciences, Clemson University, Clemson, SC 29634, USA.
authors.forename: Feng
authors.initials: F
authors.lastname: Chen
authors.affiliation: Laboratory of Nutrition and Functional Food, Jilin University, Changchun 130062, PR China. Electronic address: zhangmdjlu@163.com.
authors.forename: Mingdi
authors.initials: M
authors.lastname: Zhang
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008970:Molecular Weight; D010455:Peptides / Q000737:chemistry*; D011208:Powders; D030262:Soybean Proteins / Q000737:chemistry*; D013025:Glycine max / Q000737:chemistry*; D014867:Water / Q000032:analysis / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D010455:Peptides; D011208:Powders; D030262:Soybean Proteins; D014867:Water
keywords: Low-field nuclear magnetic resonance; Quality assurance; Soybean antioxidant peptide powder; Transverse relaxation time; Water distribution