Introduction to Lipids
Lipids
Lipids represent a large group of molecules which consist almost entirely of carbon and hydrogen atoms. A key distinguishing feature of lipids is the fact that they are insoluble in water – a characteristic termed “hydrophobic” which means “water fearing” (hydro = water ; phobic = fearful).
Let’s take a closer look at the role of lipids now…
Functions of Lipids
The key functions of lipids in biological systems include:
- Energy Storage
- Water Barrier/Protection
- Cell Membranes
- Hormones
Lipids can be categorized into (3) functional groups:
-
Oils, Fats, Waxes
- Energy storage, protection
-
Phospholipids
- Construction of cell membranes
-
Steroids
- Hormones
Lipid Function
Lipids
Lipids are water-insoluble molecules which can be categorized into several groups.
- Oils, fats and waxes
- Phospholipids
- Steroids
- In general, most lipids are used for:
- Energy storage (fats, oils)
- Protection from the environment (waxes)
- Forming cellular membranes (phospholipids)
- Signaling hormones (steroids)