Lipids are of two types based on their reaction with NaOH/KOH.
1. Saponification: These lipids contain a functional ester group and are hydrolyzed in alkaline media. Such as triglycerides, phospholipids, glycolipids, sphingolipids, waxes etc.
2. Non-saponification: These lipids do not contain functional ester groups and are not hydrolyzed in alkaline media. E.g.- terpin, prostaglandin steroid etc.