Enzymes indigenous to milk | lipases and esterases

Deeth, H. C. (2011). Enzymes indigenous to milk | lipases and esterases. In John W. Fuquay, Patrick F. Fox and Paul L. H. McSweeney (Ed.), Encyclopedia of dairy sciences 2nd ed. (pp. 304-307) Amsterdam, Netherlands: Academic Press. doi:10.1016/B978-0-12-374407-4.00157-6


Author Deeth, H. C.
Title of chapter Enzymes indigenous to milk | lipases and esterases
Title of book Encyclopedia of dairy sciences
Place of Publication Amsterdam, Netherlands
Publisher Academic Press
Publication Year 2011
Sub-type Chapter in reference work, encyclopaedia, manual or handbook
DOI 10.1016/B978-0-12-374407-4.00157-6
Open Access Status
Edition 2nd
ISBN 9780123744029
0123744024
9780123744043
0123744040
Editor John W. Fuquay
Patrick F. Fox
Paul L. H. McSweeney
Volume number 2
Start page 304
End page 307
Total pages 4
Collection year 2012
Language eng
Abstract/Summary Bovine milk contains a native lipoprotein lipase (LPL) that preferentially acts on emulsified substrates at water–oil interfaces and several esterases that preferentially act on soluble ester substrates. The lipase is by far the most abundant, most studied, best characterized, and of most practical significance. It is synthesized in the mammary gland and transported to the milk where, under certain circumstances, it catalyzes the hydrolysis of triacylglycerols to free fatty acids and mono- and diacylglycerols. It is mostly bound to the casein micelles but can move to the milk fat globule membrane under conditions that induce lipolysis of the globular fat. It is a glycoprotein of molecular mass ∼100 kDa and requires lipoproteins or apolipoproteins for full activity. By contrast, the esterases in milk are not well characterized. They are present in low concentrations except in abnormal milks such as colostrum and mastitic milks. The types reported include arylesterases, carboxylesterases, and cholinesterases. They seem to have no significant technological importance in milk. Human milk contains a relatively high concentration of a bile salt-stimulated lipase, in addition to LPL, which does not appear to be present in bovine milk. It has a role in the digestion of milk fat in neonates.
Keyword Arylesterase
Bile salt-stimulated lipase
Carboxylesterase
Cholinesterase
Q-Index Code BX
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Book Chapter
Collection: School of Agriculture and Food Sciences
 
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Created: Mon, 13 Feb 2012, 12:15:57 EST by Dr Hilton Deeth on behalf of School of Agriculture and Food Sciences