Modulation of gastrointestinal digestion of β-lactoglobulin and micellar casein following binding by (-)-epigallocatechin-3-gallate (EGCG) and green tea flavanols
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Modulation of gastrointestinal digestion of β-lactoglobulin and micellar casein following binding by (-)-epigallocatechin-3-gallate (EGCG) and green tea flavanols. / Dönmez, Özge; Mogol, Burçe Ataç; Gökmen, Vural; Tang, Ning; Andersen, Mogens Larsen; Chatterton, Dereck E. W.
In: Food & Function, Vol. 11, No. 7, 2020, p. 6038-6053.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Modulation of gastrointestinal digestion of β-lactoglobulin and micellar casein following binding by (-)-epigallocatechin-3-gallate (EGCG) and green tea flavanols
AU - Dönmez, Özge
AU - Mogol, Burçe Ataç
AU - Gökmen, Vural
AU - Tang, Ning
AU - Andersen, Mogens Larsen
AU - Chatterton, Dereck E. W.
PY - 2020
Y1 - 2020
N2 - The effect of binding of flavonoids, (-)-epigallocatechin-3-gallate (EGCG) and green tea extract (GTE), to beta-lactoglobulin (β-Lg) and micellar casein (micellar casein isolate, MCI) on protein digestibility was investigated. β-Lg resisted digestion by pepsin, but in the presence of EGCG the digestion of β-Lg was enhanced. Binding of EGCG to β-Lg was identified by nitro blue tetrazolium (NBT) staining and found, by isothermal titration calorimetry, to be an enthalpy-driven exothermic process, with a binding constant of 19 950 L mol-1. Binding promoted a more rapid digestion of β-Lg during simulated upper duodenal digestion. NBT staining indicated a loss of binding of EGCG to β-Lg during combined gastric and distal small intestinal digestion and correlated with the cleavage of β-Lg. However, increased β-Lg heteromer formation and reduced β-Lg monomer digestibility were observed for the β-Lg-GTE complex. MCI was more digestible than β-Lg during pepsin digestion, but reduced digestibility was observed for both MCI-EGCG and MCI-GTE complexes, with loss of binding during intestinal digestion. The free radical scavenging capacity (FRSC) of EGCG remained stable for the β-Lg-EGCG complex throughout the gastric and intestinal phases of digestion, but this was significantly lowered for the MCI-EGCG complex. These results indicated that polyphenols bind to milk proteins modulating the in vitro digestibility and FRSC of β-Lg and MCI as a result of the formation of complexes.
AB - The effect of binding of flavonoids, (-)-epigallocatechin-3-gallate (EGCG) and green tea extract (GTE), to beta-lactoglobulin (β-Lg) and micellar casein (micellar casein isolate, MCI) on protein digestibility was investigated. β-Lg resisted digestion by pepsin, but in the presence of EGCG the digestion of β-Lg was enhanced. Binding of EGCG to β-Lg was identified by nitro blue tetrazolium (NBT) staining and found, by isothermal titration calorimetry, to be an enthalpy-driven exothermic process, with a binding constant of 19 950 L mol-1. Binding promoted a more rapid digestion of β-Lg during simulated upper duodenal digestion. NBT staining indicated a loss of binding of EGCG to β-Lg during combined gastric and distal small intestinal digestion and correlated with the cleavage of β-Lg. However, increased β-Lg heteromer formation and reduced β-Lg monomer digestibility were observed for the β-Lg-GTE complex. MCI was more digestible than β-Lg during pepsin digestion, but reduced digestibility was observed for both MCI-EGCG and MCI-GTE complexes, with loss of binding during intestinal digestion. The free radical scavenging capacity (FRSC) of EGCG remained stable for the β-Lg-EGCG complex throughout the gastric and intestinal phases of digestion, but this was significantly lowered for the MCI-EGCG complex. These results indicated that polyphenols bind to milk proteins modulating the in vitro digestibility and FRSC of β-Lg and MCI as a result of the formation of complexes.
U2 - 10.1039/d0fo00783h
DO - 10.1039/d0fo00783h
M3 - Journal article
C2 - 32558864
VL - 11
SP - 6038
EP - 6053
JO - Food & Function
JF - Food & Function
SN - 2042-6496
IS - 7
ER -
ID: 244281520