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Conversion of cholesterol into coprostanol

Transformation of cholesterol in to coprostanol using intestinal bacteria was initially presented in the 1930s. The bacteria belonging to the genus of Eubacterium sp., Bacteroides sp., and Bifidobacterium sp were found to reduce cholesterol to coprostanol. These microorganisms residing in the small intestine can change cholesterol in to coprostanol leading to its straight elimination through faecal material. Due to this reduction process, a fall in cholesterol absorption may occur. Which may cause a decrease in the over-all physiological cholesterol concentration. This reduction process may also lead to the decreased serum cholesterol levels. The processing of colonic cholesterol by colonic bacteria generates 4-cholesten-3-one and coprostanone as intermediate species and the end product is the coprostanol. Cholesterol dehydrogenase developed by strains of Sterolibacterium denitrificans has been stated to be accountable for catalysing cholesterol to 4-cholesten-3-one transformation. Studies shows that cholesterol was perhaps changed to coprostanol by both intracellular and extracellular way.

Importance of coprostanol
Coprostanol has been commonly employed as a gauge for human manure in oceans and rivers (or other fresh water sources). Normal sterol quantities in human faecal stuff are approximately equal to \sim 5.6\,\,{\rm{mg/g}}âˆ¼5.6mg/gout of which about sixty percentage is observed to be coprostanol. Many other higher species and birds also create coprostanol. However, it is there in a low concentration. This various sources of coprostanol can turn the analysis in complicated in areas where other sources of agrarian slurries are present. Because of the plant based food trend of these species, it has been observed that they generate the 24-ethyl variety of coprostanol in larger quantity when compared to humans. The proportion of coprostanol to 24-ethyl coprostanol is approximately 2.8 in humans while it is approximately 0{\rm{ – }}1.20âˆ’1.2in other animals. In certain situations, this is enough to differentiate between the diverse sources. However, in complicated environments high level methods are required.

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Conversion of cholesterol into coprostanol
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