What is interesterification reaction?
In the food industry and biochemistry, interesterification (IE) is a process that rearranges the fatty acids of a fat product, typically a mixture of triglyceride. The process implies breaking and reforming the ester bonds C–O–C that connect the fatty acid chains to the glycerol hubs of the fat molecules.
What is the difference between interesterification and transesterification?
Esterification is any reaction (typically between an fatty acid and an alcohol) that results in the production of an ester, while transesterification is the reaction of an ester with an alcohol in order to replace the alkoxy group; it is used in the synthesis of polyesters and in the production of biodiesel.
What is the difference between hydrogenation and interesterification?
Hydrogenation is used to improve the oxidative stability of oil and to modify the physical characteristics by reducing the double bonds ( 2). Interesterification changes the distribution and positions of fatty acids within and among triglycerides to change the physical properties and behaviors of oil ( 2).
What is directed interesterification?
Introduction. Interesterification can be defined as a redistribution of the fatty acid moieties present in a triglyceride oil over its glycerol moieties. This can be random when the reaction is carried out in a single, liquid phase. This is called ‘directed interesterification’.
What is random interesterification?
Random interesterification, however, simply aims to randomize the distribution of the available fatty acid groups on the glycerol molecule and thereby to alter the melting properties of the fat or oil blend.
What happens during transesterification?
The transesterification of vegetable oils, animal fats or waste cooking oils is the process behind conventional biodiesel. In the transesterification process a glyceride reacts with an alcohol (typically methanol or ethanol) in the presence of a catalyst forming fatty acid alkyl esters and an alcohol.
What are the stages for biodiesel production process?
The major steps required to synthesize biodiesel are as follows:
- Feedstock pretreatment.
- Reactions.
- Product purification.
- Transesterification.
- Base-catalysed transesterification mechanism.
- Supercritical process.
- Ultra- and high-shear in-line and batch reactors.
- Ultrasonic reactor method.
What oils can be winterized?
Winterization is used to refine oil in salad dressings, mayonnaise, cooking oils like sunflower oil, and botanical oils. Rice bran oil is one of the most commonly winterized oils, as it has a high content of waxes, fatty acids and lipids.
What is the importance of interesterification in the food industry?
The commercial interesterification process used by the food industry for spreads, bakery and confectionary products reduces the saturated fatty acid content of the fat by approximately 10% compared to a non‐IE fat with a similar solid content.
How is hydrogenation done?
The process of hydrogenation involves the use of hydrogen molecules to saturate organic compounds, in the presence of a catalyst. Catalysts are species that are used to speed up the rate of a reaction without being consumed during the process. Keep in mind that catalysts are essential to running this reaction.
What is interesterification in lard?
Interesterification can be defined as a redistribution of the fatty acid moieties present in a triglyceride oil over its glycerol moieties. It will continue to redistribute these residual fatty acids and thereby form further higher-melting triglycerides that then also crystallize.
