An investigation of lipolysis in the bovine rumen : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science in Animal Science.
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Date
1969
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Massey University
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Abstract
1.1. Lipases 1.1.1. Terminology Lipolytic enzymes may be considered as a special class of carboxyl esterases, as they catalyse the hydrolysis of ester link-ages in lipids with the formation of alcohol and fatty acid moieties. In mammalian systems lipolytic enzymes are generally subdivided into three classes; those acting on fats (lipases); those acting on fats in the form of lipoprotein (lipoprotein lipases); and those acting on the ester bonds in phospholipids (phospholipases). However this classification based on substrate specifity is of limited value only, as many of the enzymes that hydrolyse carboxyl esters, exhibit a very wide substrate specificity. Consequently a review of lipases is complicated by the general confusion centred around the exact meaning of the term 'lipase'. With a natural triglyceride, e.g. triolein, specificity of the enzyme may be referred to the alcohol glycerol, so that enzymes hydrolyzing fatty acids from glycerol are lipases. Alternatively specificity may be referred to the long chain fatty acid, and enzymes hydrolysing long-chain fatty acids from esters of several different alcohols may be regarded as lipases (Balls and Matlack, 1938). [FROM INTRODUCTION]
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Lipolysis, Rumen