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Functionalization of sodium carboxymethylated yeast β‐glucan by epigallocatechin gallate: Antioxidant activity and color stability
Author(s) -
Chen Meiling,
Ji Tianchen,
Hong Jianquan,
Zheng Changge
Publication year - 2021
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.202000550
Subject(s) - chemistry , glucan , thermogravimetric analysis , dpph , epigallocatechin gallate , abts , nuclear chemistry , antioxidant , gallate , thermal stability , polyphenol , food science , organic chemistry
Abstract Sodium carboxymethylated yeast β‐glucan (SC‐GLUCAN) was functionalized with epigallocatechin gallate (EGCG) by esterification. EGCG was first succinylized and then grafted onto SC‐GLUCAN through an N , N ′ carbonyldiimidazole mediated reaction. The graft of EGCG with SC‐GLUCAN (SC‐GLUCAN‐g‐EGCG) was verified by spectroscopic (UV, FTIR) and thermal (derivative thermogravimetric [DTG] and thermogravimetric analysis [TGA]) analyses. The grafting ratio of SC‐GLUCAN‐g‐EGCG was determined by the Folin–Ciocalteu procedure and up to 100.25 mg/g SC‐GLUCAN‐g‐EGCG. The antioxidant activity of SC‐GLUCAN‐g‐EGCG was evaluated by scavenging activity of DPPH and ABTS radical, reducing power, and iron chelating ability. SC‐GLUCAN‐g‐EGCG exhibited dramatical increases in DPPH and ABTS radical scavenging activity. In addition, the color development of SC‐GLUCAN‐g‐EGCG solution was studied through sun irradiation. SC‐GLUCAN‐g‐EGCG solutions presented better color stability at 0.2 and 0.4 mg/mL, especially within 4 hr of the sun. TGA and DTG showed that SC‐GLUCAN‐g‐EGCG had good thermal stability. Therefore, SC‐GLUCAN‐g‐EGCG might show potential in active food packaging, and could be further used as cosmetics ingredient.