title: Synergy of licorice extract and pea protein hydrolysate for oxidative stability of soybean oil-in-water emulsions.
abstract: Previously developed radical-scavenging pea protein hydrolysates (PPHs) prepared with Flavourzyme (Fla-PPH) and Protamex (Pro-PPH) were used as cosurfactants with Tween 20 to produce soybean oil-in-water (O/W) emulsions, and the suppression of lipid oxidation was investigated. Both PPHs significantly retarded oxidation (P < 0.05) of the emulsions when stored at 37 °C for 14 days. Electron microscopy revealed an interfacial peptidyl membrane around oil droplets, which afforded steric restrictions to oxidation initiators. When licorice extract (LE) was also used in emulsion preparation, a remarkable synergistic oxidation inhibition was observed with both PPHs. LE adsorbed onto oil droplets either directly or through associating with PPH to produce a thick and compact interfacial membrane enabling the defense against oxygen species. Liquiritin apioside, neolicuroside, glabrene, and 18β-glycyrrhetic acid were the predominant phenolic derivatives partitioning at the interface and most likely the major contributors to the notable synergistic antioxidant activity when coupled with PPHs.
authors: State Key Laboratory of Food Science and Technology and School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, China.
authors: Xin
authors: X
authors: Zhang
authors: Youling L
authors: YL
authors: Xiong
authors: Jie
authors: J
authors: Chen
authors: Lirong
authors: L
authors: Zhou
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D045703:Emulsifying Agents / Q000819:agonists / Q000737:chemistry / Q000378:metabolism; D004655:Emulsions; D010450:Endopeptidases / Q000378:metabolism; D005419:Flavonoids / Q000819:agonists / Q000737:chemistry; D005520:Food Preservatives / Q000737:chemistry / Q000378:metabolism; D061353:Food Storage; D005960:Glucosides / Q000819:agonists / Q000737:chemistry; D006035:Glycyrrhiza / Q000737:chemistry*; D010084:Oxidation-Reduction; D018532:Pisum sativum / Q000737:chemistry*; D010936:Plant Extracts / Q000819:agonists / Q000737:chemistry*; D014674:Plant Proteins, Dietary / Q000819:agonists / Q000737:chemistry* / Q000378:metabolism; D018517:Plant Roots / Q000737:chemistry; D011492:Protein Hydrolysates / Q000819:agonists / Q000737:chemistry*; D055550:Protein Stability; D055314:Seed Storage Proteins / Q000819:agonists / Q000737:chemistry / Q000378:metabolism; D012639:Seeds / Q000737:chemistry; D013024:Soybean Oil / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000975:Antioxidants; D045703:Emulsifying Agents; D004655:Emulsions; D005419:Flavonoids; D005520:Food Preservatives; D005960:Glucosides; D010936:Plant Extracts; D014674:Plant Proteins, Dietary; D011492:Protein Hydrolysates; D055314:Seed Storage Proteins; D013024:Soybean Oil; D010450:Endopeptidases; C412470:flavourzyme