Addition of either gastric lipase or cholesterol esterase to improve both beta-cryptoxanthin ester hydrolysis and micellarization during in vitro digestion of fruit pulps

Author(s)

Petry, Fabiane C. ^[1] ; Mercadante, Adriana Z. ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Fac Food Engn, Dept Food Sci, Food Res Ctr FoRC, Rua Monteiro Lobato 80, BR-13083862 Campinas, SP - Brazil

• Document type: Journal article
• Source: Food Research International; v. 137, NOV 2020.
• Web of Science Citations: 0

Abstract

Using the INFOGEST in vitro digestion protocol adapted to carotenoids, the impact of additional rabbit gastric lipase (RGL) on the hydrolysis extent of beta-cryptoxanthin esters was evaluated for the first time, and compared with the addition of porcine cholesterol esterase (CEL). Both the modifications increased the hydrolysis of (all-E)beta-cryptoxanthin esters from mandarin and peach pulps, although the outcomes were different. Addition of RGL consistently increased the average hydrolysis extent from 55.2% to 59.5% in mandarin pulp and from 22.7% to 48.8% in peach pulp (p < 0.05). The addition of CEL produced lower hydrolysis extents, i.e., 58.5% in mandarin (not statistically significant) and 28.4% in peach (p < 0.05), compared to those obtained with RGL. The hydrolysis extent positively correlated with the carotenoid ester concentration in both matrices. Bioaccessibility values were higher in mandarin pulp (range 32-34%) compared to those in peach pulp (range 16-21%), and were associated with the hydrolysis extent of the carotenoid esters during digestion. Addition of RGL and CEL produced no significant (p < 0.05) effect on the overall carotenoid bioaccessibility values of mandarin, while positively affected those in peach. Altogether these results corroborate that the hydrolysis extent of xanthophyll esters limits bioaccessibility. Additionally, hydrophobicity of the carotenoid inversely correlates with micellarization, as free (all-E)-xanthophylls micellarized in a higher extent compared to (all-E)-beta-carotene and xanthophyll esters. The new information of our results is that the addition of rabbit gastric lipase substantially contributes to the hydrolysis of beta-cryptoxanthin esters from fruit pulps, and consequently, to increase carotenoid bioaccessibility, being even more effective than CEL. (AU)

• FAPESP's process: 17/08648-0 - Study of alterations in the INFOGEST in vitro digestion protocol and of exogenous lipid addition on the bioaccessibility and hydrolysis of carotenoid esters
• Grantee: Fabiane Cristina Petry
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/23752-1 - Multi0user equipment approved in grant 2013/07914-8: high-speed liquid chromatography coupled to arrangement of diodes, fluorescence and masses
• Grantee: Adriana Zerlotti Mercadante
• Support Opportunities: Multi-user Equipment Program