The study of curcumin interaction with micellar casein and lactic acid bacteria cell envelope

The study of curcumin interaction with micellar casein and lactic acid bacteria cell envelope Curcumin interaction with micellar caseins (MC), Lactobacillus delbrueckii bulgaricus (Lb) and Streptococcus thermophilus (St) and its influence on the acid gelation were investigated. Epifluorescence microscopy evidenced the adsorption of curcumin on bacteria surfaces and its transfer from MC to bacteria. Fluorescence spectroscopy of curcumin and fluorescence quenching of caseins variations in presence of bacteria and MC were evaluated. The interaction between curcumin and St and Lb was confirmed due to the decrease of curcumin fluorescence intensity from 1.7 A.U to 1.20 A.U and to 1.40 A.U, respectively. The transfer of curcumin between MC and bacteria was confirmed. The curcumin interacted more with St than with Lb envelope with a fluorescence intensity decrease from 6.20 ± 0.02 A.U to 5.20 ± 0.08 A.U and to 4.60 ± 0.08 A.U, respectively. It also showed that St was more hydrophobic than Lb bacterial envelope leading curcumin to interact more with Streptococcus surface. Curcumin adsorption did not affect Lb and St growth nor its acidification rate of milk. The acid gelation study led to a typical gel yoghurt-like formation. For the first time, it was demonstrated that curcumin interacted with lactic bacteria without modifying its growth and milk acidic gelation property. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png LWT - Food Science and Technology Elsevier

The study of curcumin interaction with micellar casein and lactic acid bacteria cell envelope

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0023-6438
D.O.I.
10.1016/j.lwt.2018.01.067
Publisher site
See Article on Publisher Site

Abstract

Curcumin interaction with micellar caseins (MC), Lactobacillus delbrueckii bulgaricus (Lb) and Streptococcus thermophilus (St) and its influence on the acid gelation were investigated. Epifluorescence microscopy evidenced the adsorption of curcumin on bacteria surfaces and its transfer from MC to bacteria. Fluorescence spectroscopy of curcumin and fluorescence quenching of caseins variations in presence of bacteria and MC were evaluated. The interaction between curcumin and St and Lb was confirmed due to the decrease of curcumin fluorescence intensity from 1.7 A.U to 1.20 A.U and to 1.40 A.U, respectively. The transfer of curcumin between MC and bacteria was confirmed. The curcumin interacted more with St than with Lb envelope with a fluorescence intensity decrease from 6.20 ± 0.02 A.U to 5.20 ± 0.08 A.U and to 4.60 ± 0.08 A.U, respectively. It also showed that St was more hydrophobic than Lb bacterial envelope leading curcumin to interact more with Streptococcus surface. Curcumin adsorption did not affect Lb and St growth nor its acidification rate of milk. The acid gelation study led to a typical gel yoghurt-like formation. For the first time, it was demonstrated that curcumin interacted with lactic bacteria without modifying its growth and milk acidic gelation property.

Journal

LWT - Food Science and TechnologyElsevier

Published: May 1, 2018

References

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