Lipids

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Steroids (derived from steranes)
They are divided into: sterols (like cholesterol, vit D, ac.biliares)
and lasts steroid that there are two groups: adrenal hormones and sex hormones.
Prostaglandins, which is the basic molecule prostanato.
Glyceride
They are simple lipids belonging to the group of saponifiable lipids formed by the esterification of 1.2, o3 fatty acid and 1 molecule of glycerol (propanetriol)
The Glyceride auga are insoluble molecules, but the polarity is different in monoacylglycerides, diacilgliceridos and triglycerides:
Monoacylglycerides: show some polarity of the 2 hydroxyl groups (drawing)
Diacilgliceridos: less polar (1grupo OH) (picture)
Triacylglycerols: they are completely hydrophobic molecules that repel water. Zero polarity.
The Glyceride off the bases leading to saponification reactions that occur in the soap molecules (drawing)
Ester (Glyceride) + Base ---> Soap + Glycerine.
According to the number of unsaturated fatty acids present the Glyceride, varying its state (liquid / solid) so can be distinguished:
"The oil, has at least 1 unsaturated fatty acids and their state is liquid
"The tallow, unsaturated fatty acids is not what makes their solid state
"The fats, semisolid.
This is due to the presence of double and triple bonds in unsaturated fatty acids that cause "elbows" in the molecules that hinder the formation of Van Der Waals bonds, so the melting point is lower. When the molecules are linear, no elbows (in saturated fatty acids), the Van der Waals bonds are more frequent and increases the melting point

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