human body) ?the plex biomolecules ?the most diversified biological functionsРHow are about proteins?Р4РWhat do proteins do?Р5РSection 1?ponents of ProteinsР6Рmajor elements?C (50~55%), H (~7%), O (19~20%), N (13~19%), S (~4%) ?trace elements?P, Fe, Cu, Zn, I, …РComponents of proteinsР7РThe average nitrogen content in proteins is about 16%, and proteins are the major source of N in biological systems. ?The protein quantity can be estimated.Рprotein in 100g sample = N per gram x 6.25 x 100Р8Р§1.1 Amino AcidsРThe basic building blocks of proteins?About 300 types of AAs in nature, but only 20 types are used for protein synthesis in biological systems.?A amino group, a carboxyl group, a H atom and a R group are connected to a C atom. ?The C atom is an optically active center.Р9РL-Amino acidР10
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