title: Moisture-Absorption and Water Dynamics in the Powder of Egg Albumen Peptide, Met-Pro-Asp-Ala-His-Leu.
abstract: Moisture absorbed into the powder of Met-Pro-Asp-Ala-His-Leu (MPDAHL)-a novel egg albumen antioxidant peptide-profoundly affects its properties. In this study, we elucidated water dynamics in MPDAHL using DVS, DSC, and low-field1H NMR. Based on the DVS data, we found that MPDAHL sorption kinetics obey a parallel exponential model. DSC results indicated that both water and heating could change the microstructure of MPDAHL. The T2parameters of NMR reflected the different phases of moisture absorption revealed that there were 4 categories of water with different states or mobility in the MPDAHL during the moisture absorption process. The fastest fraction T2bmainly dominated the hygroscopicity of MPDAHL and the absorbed water significantly changed the proton distribution and structure of MPDAHL. Thus, this study shows that DVS, DSC, and low-field1H NMR are effective methods for monitoring water mobility and distribution in synthetic peptides. It can be used to improve the quality assurance of functional peptides.
authors.affiliation: College of Food Science & Engineering, Jilin Univ, Changchun, 130062, P. R. China.
authors.forename: Shuailing
authors.initials: S
authors.lastname: Yang
authors.affiliation: College of Food Science & Engineering, Jilin Univ, Changchun, 130062, P. R. China.
authors.forename: Xuye
authors.initials: X
authors.lastname: Liu
authors.affiliation: College of Food Science & Engineering, Jilin Univ, Changchun, 130062, P. R. China.
authors.forename: Mingdi
authors.initials: M
authors.lastname: Zhang
authors.affiliation: College of Food Science & Engineering, Jilin Univ, Changchun, 130062, P. R. China.|School of Food Science and Technology, Dalian Polytechnic Univ, Engineering Research Center of Seafood of Ministry of Education, Dalian, 116034, P. R., China.
authors.forename: Songyi
authors.initials: S
authors.lastname: Lin
authors.affiliation: Dept. of Food, Nutrition and Packaging Sciences, Clemson Univ, Clemson, S.C., 29634, U.S.A.
authors.forename: Feng
authors.initials: F
authors.lastname: Chen
mesh_terms: D000418:Albumins / Q000737:chemistry*; D000818:Animals; D002152:Calorimetry, Differential Scanning; D002645:Chickens; D017666:Deuterium Oxide / Q000737:chemistry; D004151:Dipeptides / Q000737:chemistry; D004531:Eggs / Q000032:analysis*; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D010455:Peptides / Q000737:chemistry*; D011208:Powders; D011786:Quality Control; D014867:Water / Q000737:chemistry*
chemical_list: D000418:Albumins; D004151:Dipeptides; D010455:Peptides; D011208:Powders; D014867:Water; C038123:alanylproline; C038047:alanylaspartic acid; C061116:alanylhistidine; C070752:aspartyl-proline; D017666:Deuterium Oxide
keywords: differential scanning calorimetry; dynamic vapor sorption; egg albumen peptide; low-field nuclear magnetic resonance; water dynamics