Conjugated linoleic acid (CLA) is a kind of fatty acid with physiological activities and potential application prospect. A synthesis method of conjugated linoleic acid and a purification technology were studied. CLA w...Conjugated linoleic acid (CLA) is a kind of fatty acid with physiological activities and potential application prospect. A synthesis method of conjugated linoleic acid and a purification technology were studied. CLA was prepared and purified by urea-complexation and conjugation using safflower oil as raw material. The purity of CLA and total recovery of the product was more than 95% and 48%, respectively. The main isomers produced in alkali-catalyzed conjugation were identified by gas chromatography (GC) linked to mass spectrometry (MS) and Fourier transform infrared spectroscopy (FTIR). The total amount of the two main isomers (9cis, 11trons-and 10trans, 12cis-CLA) determined by GC was more than 90% of the product.展开更多
Amino silicone resins were synthesized through a three-step method using （3-aminopropyl） triethoxysilane （APTES）, methyltrimethoxysilane （MTMS） and end-capping agents, The products were characterized by Fourier ...Amino silicone resins were synthesized through a three-step method using （3-aminopropyl） triethoxysilane （APTES）, methyltrimethoxysilane （MTMS） and end-capping agents, The products were characterized by Fourier transformed infrared spec- troscopy （FT-IR）, nuclear magnetic resonance （ 1 H NMR）, element analysis and gel permeation chromatography （GPC）. The results of 1 H NMR indicate that the chemical shift signal of acid-catalyzed products is weak at δ3.4 （attributing to alkoxy）. FT-IR shows that there is a vibration peak of Si-OH at 3 100-3 600 cm 1 and the intensity of the peaks is most weak at 6h. The results show that this method cannot only effectively reduce the residue of alkoxy groups and Si-OH groups, but also obtain the products with sufficient amino group. It concludes that this resin is suitable as modifier in the silicone rubber.展开更多
文摘Conjugated linoleic acid (CLA) is a kind of fatty acid with physiological activities and potential application prospect. A synthesis method of conjugated linoleic acid and a purification technology were studied. CLA was prepared and purified by urea-complexation and conjugation using safflower oil as raw material. The purity of CLA and total recovery of the product was more than 95% and 48%, respectively. The main isomers produced in alkali-catalyzed conjugation were identified by gas chromatography (GC) linked to mass spectrometry (MS) and Fourier transform infrared spectroscopy (FTIR). The total amount of the two main isomers (9cis, 11trons-and 10trans, 12cis-CLA) determined by GC was more than 90% of the product.
基金Supported by the National Natural Science Foundation of China(31170558)
文摘Amino silicone resins were synthesized through a three-step method using （3-aminopropyl） triethoxysilane （APTES）, methyltrimethoxysilane （MTMS） and end-capping agents, The products were characterized by Fourier transformed infrared spec- troscopy （FT-IR）, nuclear magnetic resonance （ 1 H NMR）, element analysis and gel permeation chromatography （GPC）. The results of 1 H NMR indicate that the chemical shift signal of acid-catalyzed products is weak at δ3.4 （attributing to alkoxy）. FT-IR shows that there is a vibration peak of Si-OH at 3 100-3 600 cm 1 and the intensity of the peaks is most weak at 6h. The results show that this method cannot only effectively reduce the residue of alkoxy groups and Si-OH groups, but also obtain the products with sufficient amino group. It concludes that this resin is suitable as modifier in the silicone rubber.
