脂酸的空间构象
脂酸的空间构象
(1)物理性质 (2)化学性质 ① 由酯键产生的性质——水解和皂化 脂肪的性质
(1)物理性质 (2)化学性质 ① 由酯键产生的性质——水解和皂化 脂肪的性质
0 CH2-O-C-R1 0 000-3 Triacylglycerol 0 CH2-O-C-R3 saponification 3KOH K- CH2-OH CH-OH K CH2-OH K*-0-C -R3 Glycerol Soaps (K*salts of fatty acids) Figure Triacylglycerol breakdown by alkaline hydrolysis:the process of saponification.Rl,R2,R3 represent long alkyl chains.Household soap is made by hydrolyzing a mixture of triacylglycerols (animal fat,for example)with KOH.The K salts of the fatty acids are collected,washed free of KOH,and pressed into cakes
皂化值(价)(saponification number or value): 皂化1g脂肪所需KOH的mg数。 TG平均Mr = 3×56×1000 皂化价
皂化值(价)(saponification number or value): 皂化1g脂肪所需KOH的mg数。 TG平均Mr = 3×56×1000 皂化价
A.氢化: —CH=CH- Ni or Pd or Pt 加氢 —CH2-CH2- 由不饱和脂酸产生的性质 B.卤化: —CH=CH- + I2 —CH-CH- I I 碘值(价)(iodine number or value): 100g脂肪能吸收碘的g数
A.氢化: —CH=CH- Ni or Pd or Pt 加氢 —CH2-CH2- 由不饱和脂酸产生的性质 B.卤化: —CH=CH- + I2 —CH-CH- I I 碘值(价)(iodine number or value): 100g脂肪能吸收碘的g数