Study Set Content:
are a heterogeneous group of compounds that have a common property of being
Lipids
Lipids have a common property of being
– Relatively insoluble in water, and – Soluble in nonpolar solvents and solvents with low polarity, such as ether and chloroform
– Lipids play (3) major roles in human biochemistry
Storage
Membrane components
Chemical messenger
: they store energy within fat cells
Storage
they are part of membranes that separate compartments of aqueous solutions from each other
Membrane components
send signals from one part of the body to another and mediate hormonal response
Chemical messenger
– deliver signals from one part of the body to another part eg, STEROID HORMONES
Primary messengers
mediate the hormonal response eg, PROSTAGLANDINS, THROMBOXANES
Secondary messengers
esters of fatty acids with various alcohols
Simple lipids
esters of fatty acids containing groups in addition to an alcohol and a fatty acid
Complex lipids
steroids, fatsoluble vitamins, hormones
. Precursor and derived lipids:
: esters of fatty acids with glycerol
Fats and oils
esters of fatty acids with high molecular weight monohydric alcohols
Waxes
• a triglyceride mixture that is a solid or a semi-solid at room temperature (25⁰C)
Fat
• a triglyceride mixture that is liquid at room temperature (25⁰C)
Oil
Obtained from animal sources
Fat
• Contains high proportion of long chain saturated fatty acids
Fat
obtained from plants or fish
Oil
Contains long chain unsaturated fatty acids or short chain saturated fatty acids
Oil
Animal fats and plant oils are
triglycerides
