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Triacylglycerols Questions

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1. There are some notable exceptions to the generalization that vegetable triacylglycerols
are liquids while animal triacylglycerols are solids. Coconut and palm oils are solids while
fish oils are liquids. Explain.
Triacylglycerol is the major form of dietary lipid in fats and oils, whether derived from plants or
animals. The properties of the fatty acids, fats have a predominance of saturated fatty acids, and
oils are composed largely of unsaturated acids. Thus, the melting points of triglycerides reflect
their composition. Natural mixed triglycerides have somewhat lower melting points, the melting
point of lard being near 30 º C, whereas olive oil melts near -6 º C. Vegetable oils are converted
to solid triglycerides by partial hydrogenation of their unsaturated components. In animals, the
carbon atoms in the fatty acids are saturated with hydrogen atoms. This allows them to lie
straight and the molecules will pack neatly into a solid arrangement. In plants, missing hydrogen
atoms cause kinks in the fatty acids. This reduces the amount of intermolecular bonding that can
occur and keeps the molecules liquid at room temperature.
In general, liquid fats come from plant oils and are unsaturated fats while fats that are solid come
from animals and are saturated fats, exceptions where saturated fats are found in plant foods.
And these include coconut oil, which contain some saturated fat along with mostly
mono-unsaturated fat. These are plant oils that behave like saturated fats because their building
blocks have been altered and can stack tightly to be solid at room temperature.
2. Medical practitioner advise that we increase the proportions of triglycerol intake that is
unsaturated. The manufacturer of margarine by partial hydrogenation of corn or other
vegetable oils decreases the unsaturated content of the product. Explain.
Fats are an essential part of the diet. An unsaturated fat is a fat or fatty acid in which there is one
or more double bond in the fatty acid chain. All dietary fat and oils are a mixture of fatty acids
packaged as triglycerides. Some foods, have a higher proportion of a certain type of fatty acid.
When a food is said to be high in saturated fat like for example butter, it means it has a high
percentage of saturated fatty acids compared to the other types of fatty acids. Hydrogenated oils
can be sold directly as 'spreads', but are also used in the food industry in the manufacture of
many foodstuffs such as biscuits and cakes. Since the process of hydrogenation adds hydrogen

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1. There are some notable exceptions to the generalization that vegetable triacylglycerols are liquids while animal triacylglycerols are solids. Coconut and palm oils are solids while fish oils are liquids. Explain. Triacylglycerol is the major form of dietary lipid in fats and oils, whether derived from plants or animals. The properties of the fatty acids, fats have a predominance of saturated fatty acids, and oils are composed largely of unsaturated acids. Thus, the melting points of triglycerides reflect their composition. Natural mixed triglycerides have somewhat lower melting points, the ...
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