Cholesterol Esters
Cholesterol Esters - Related Videos
04:10
Hydrolysis of an Ester - Concepts
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2020
Triglycerides Triglycerides are triester molecules composed of a glycerol backbone that is bound to 3 fatty acids. These form the basis of many biological lipids that are found in vegetable oils and fats. Lipids that are isolated from plant material are the basis of vegetable oils, whereas lipids extracted from animals are used as lard or general sources of fats. A fatty acid molecule has a long carbon chain — between 12 and 20 carbons — with a weak organic acid at one end. Some fatty acids...
11:04
Hydrolysis of an Ester - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Preparation of SoapExpand Soap is prepared using a saponification reaction, where a base catalyzes the hydrolysis of three ester groups of an oil, such as coconut oil. During saponification, hydroxide ions from the base attack the carbonyl group on the oil to form a ratio of three molecules of soap to one molecule of glycerol. The resulting soap molecule is a long carbon chain, which is...
11:07
Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans
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Cited by 21 •
2014
In this article, a protocol for infection of macrophages with Cryptococcus neoformans is described. Also, a method for sterol depletion from the macrophages is explained. These protocols provide a guide to study fungal infections in vitro and examine the role of sterols in such infections.
01:29
Cholesterol: Significance and Regulation
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2024
Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces. Considering cholesterol and...
07:54
Cholesterol Efflux Assay
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Cited by 74 •
2012
The cholesterol assay is designed to quantitate the rate of cholesterol efflux from cultured cells and the capacity of plasma acceptors to accept cholesterol released from cells. The assay consists of labelling cells with cholesterol, equilibration of cholesterol among intracellular pools and release of cholesterol to an extracellular acceptor.
FAQs
The hydroxyl group provides the reactive site where a fatty acid becomes linked to cholesterol through an ester bond. This transformation changes the molecule’s chemical behavior without removing the cholesterol framework. In chemical analysis, focusing on this functional-group conversion helps explain why the resulting lipid behaves differently from cholesterol itself.
Esterification reduces the polarity associated with cholesterol’s hydroxyl group, producing a highly hydrophobic molecule. Because of this change, cholesterol esters favor nonpolar lipid environments rather than more polar surroundings. They can therefore accumulate in lipid droplets or occupy the hydrophobic core of lipoprotein particles, influencing lipid partitioning.
Unesterified cholesterol retains a free hydroxyl group, whereas cholesterol esters contain that group within an ester bond. The esterified form is neutral and substantially more hydrophobic, so it contributes differently to lipid organization. This distinction is important when interpreting membrane composition, storage pools, and lipoprotein structure.
Formation and breakdown determine how much cholesterol is held in an esterified storage or transport form rather than remaining in other lipid pools. Changes in this balance can alter cellular lipid composition and cholesterol homeostasis. For chemistry and biochemistry research, the balance provides a way to connect molecular structure with overall lipid regulation.
A useful study distinguishes cholesterol esters from cholesterol by comparing their polarity, hydrophobicity, and location within lipid environments. Researchers can then examine whether the material is associated with lipid droplets, lipoprotein particles, or membrane-related composition. This framework links a functional-group change to measurable differences in lipid organization and transport.
Two important settings are lipid droplets and lipoprotein particles. Lipid droplets provide a storage environment, while cholesterol esters occupy the hydrophobic core of lipoproteins involved in transport. Examining both settings helps researchers relate molecular hydrophobicity to the movement and retention of cholesterol within biological lipid systems.
Altered formation or breakdown of cholesterol esters can influence cellular lipid balance and cholesterol homeostasis. These changes make cholesterol ester metabolism relevant to disease research, where investigators examine how disrupted lipid handling may affect biological systems. The chemistry provides context for connecting ester structure and hydrophobic storage with broader cellular consequences.