Chem. J. Chinese Universities ›› 2015, Vol. 36 ›› Issue (8): 1535.doi: 10.7503/cjcu20141106
• Organic Chemistry • Previous Articles Next Articles
WANG Zitian, SU Jianxiao, DU Wei*(), DAI Lingmei, LIU Dehua
Received:
2014-12-17
Online:
2015-08-10
Published:
2015-07-17
Contact:
DU Wei
E-mail:duwei@tsinghua.edu.cn
Supported by:
CLC Number:
TrendMD:
WANG Zitian, SU Jianxiao, DU Wei, DAI Lingmei, LIU Dehua. Lipozyme TL IM-catalyzed Esterification of Oleic Acid for 1,3-Diacylglycerol Preparation†[J]. Chem. J. Chinese Universities, 2015, 36(8): 1535.
Time/min | V(Dichloromethane)∶V(Acetonitrile-acetic acid)b |
---|---|
0 | 0∶100 |
4 | 0∶100 |
12 | 10∶90 |
25 | 10∶90 |
30 | 30∶70 |
35 | 30∶70 |
45 | 80∶20 |
55 | 80∶20 |
60 | 0∶100 |
65 | 0∶100 |
Table 1 Gradient elution programa
Time/min | V(Dichloromethane)∶V(Acetonitrile-acetic acid)b |
---|---|
0 | 0∶100 |
4 | 0∶100 |
12 | 10∶90 |
25 | 10∶90 |
30 | 30∶70 |
35 | 30∶70 |
45 | 80∶20 |
55 | 80∶20 |
60 | 0∶100 |
65 | 0∶100 |
Fig.1 Effects of solvents on DO yield(A) and positional selectivity(B) during esterificationn(OA)∶n(MO)=1.5∶1, water activity=0.53, 45 ℃, 15%(mass ratio) enzyme to OA, 200 r/min,3 g molecular sieve. a. Acetone; b.t-butanol; c. chloroform; d. n-hexane.
Fig.2 Effects of water activity on DO yield(A) and positional selectivity(B) during esterificationn(OA)∶n(MO)=1.5∶1, 20%(mass fraction) chloroform, 45 ℃, 15%(mass ratio) enzyme to OA, 200 r/min, 3 g molecular sieve. Water activity: a. 0.11; b. 0.33; c. 0.53; d. 0.75; e. 0.97.
Fig.3 Effects of temperature on DO yield(A) and positional selectivity(B) during esterificationn(OA)∶n(MO)=1.5∶1, 20%(mass fraction) chloroform, water activity: 0.33, 15%(mass ratio) enzyme to OA, 200 r/min, 3 g molecular sieve. Temperature/℃: a. 45; b. 55; c. 60.
Fig.4 Effects of molar ratio of oleic acid to monoglycerid on DO yield(A) and positional selectivity(B) during esterification20%(mass fraction) Chloroform, water activity: 0.33, 45 ℃, 15% enzyme, 200 r/min, 3 g molecular sieve.n(OA)∶n(MO): a. 1∶1; b. 1.2∶1; c. 1.5∶1; d. 2∶1.
Fig.5 Effects of solvent quantity on DO yield(A) and positional selectivity(B) during esterificationn(OA)∶n(MO)=1.5∶1, chloroform, water activity: 0.33, 45 ℃, 15% enzyme, 200 r/min, 3 g molecular sieve. Mass fraction of solvent: a. 20%; b. 40%; c. 60%; d. 80%.
Fig.6 Operational yield(A) and selectivity(B) of Lipozyme TL IM during the esterification Reaction conditions: n(OA)∶n(MO)=1.5∶1, 60% chloroform, water activity: 0.33, 45 ℃, 15% enzyme, 200 r/min, 3 g molecular sieve.
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