Velez_2023_Food.Res.Int_169_112861

Reference

Title : Study of volatile compounds profiles in milk matrices using Enterococcus faecalis EstA and Rhizomucor miehei lipase - Velez_2023_Food.Res.Int_169_112861
Author(s) : Velez MA , Wolf VI , Espariz M , Acciarri G , Magni C , Hynes E , Perotti MC
Ref : Food Res Int , 169 :112861 , 2023
Abstract :

The use of esterase/lipase enzymes of different origins in food industry is a widely employed strategy to enhance the formation of characteristic aromatic compounds derived from fat and diversify flavour. In the present work, we studied EstA enzyme of Enterococcus faecalis and a high purity Rhizomucor miehei lipase (Palatase). EstA was obtained recombinantly in Escherichia coli BL21 (DE3), and optimum esterase activity was detected at pH 6.75 and 40 degreesC. We evaluated the effect of the enzymes on milk mixtures prepared with different fat contents (2.8 and 6%) and structure (native or homogenized) on volatile compounds profiles. The milk fat structure before and after the application of low homogenization was characterized by dynamic light dispersion and microscopy. Native milk fat mixtures presented particles of 4.6 microm and 184 nm and homogenized mixtures had particles of 1.4 microm and 258 nm; microscopy images were in concordance with these results. Fifteen volatile compounds were identified, including ketones, esters, alcohols, and acids. We showed the key role of milk fat levels and microstructure in the nature of the volatile compounds produced by the R. miehei enzyme. Both in native or homogenized states, the highest content of fat favored a higher production of acids whereas the lowest fat level favored a higher esters production along with a more balanced volatile profile. For EstA enzyme, results showed a limited action on fat, as biosynthesis of esters only increased with the highest fat level homogenized.

PubMedSearch : Velez_2023_Food.Res.Int_169_112861
PubMedID: 37254435
Gene_locus related to this paper: entfa-EF2728 , rhimi-lipas

Related information

Gene_locus entfa-EF2728    rhimi-lipas

Citations formats

Velez MA, Wolf VI, Espariz M, Acciarri G, Magni C, Hynes E, Perotti MC (2023)
Study of volatile compounds profiles in milk matrices using Enterococcus faecalis EstA and Rhizomucor miehei lipase
Food Res Int 169 :112861

Velez MA, Wolf VI, Espariz M, Acciarri G, Magni C, Hynes E, Perotti MC (2023)
Food Res Int 169 :112861