title: Composition, structure and functional properties of protein concentrates and isolates produced from walnut (Juglans regia L.).
abstract: In this study, composition, structure and the functional properties of protein concentrate (WPC) and protein isolate (WPI) produced from defatted walnut flour (DFWF) were investigated. The results showed that the composition and structure of walnut protein concentrate (WPC) and walnut protein isolate (WPI) were significantly different. The molecular weight distribution of WPI was uniform and the protein composition of DFWF and WPC was complex with the protein aggregation. H(0) of WPC was significantly higher (p < 0.05) than those of DFWF and WPI, whilst WPI had a higher H(0) compared to DFWF. The secondary structure of WPI was similar to WPC. WPI showed big flaky plate like structures; whereas WPC appeared as a small flaky and more compact structure. The most functional properties of WPI were better than WPC. In comparing most functional properties of WPI and WPC with soybean protein concentrate and isolate, WPI and WPC showed higher fat absorption capacity (FAC). Emulsifying properties and foam properties of WPC and WPI in alkaline pH were comparable with that of soybean protein concentrate and isolate. Walnut protein concentrates and isolates can be considered as potential functional food ingredients.
authors.affiliation: State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, Jiangsu Province, China.|Food College of Shihezi University, Shihezi, 832003, Xinjiang Province, China.
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Mao
authors.affiliation: State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, Jiangsu Province, China.
authors.forename: Yufei
authors.initials: Y
authors.lastname: Hua
mesh_terms: D005223:Fats / Q000737:chemistry*; D031324:Juglans / Q000737:chemistry*; D010940:Plant Proteins / Q000737:chemistry*; D066329:Protein Aggregates
chemical_list: D005223:Fats; D010940:Plant Proteins; D066329:Protein Aggregates