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Effects of cytoplasm and reactant polarities on acid-catalyzed lipid transesterification in wet microalgal cells subjected to microwave irradiation.
- Source :
-
Bioresource technology [Bioresour Technol] 2016 Jan; Vol. 200, pp. 738-43. Date of Electronic Publication: 2015 Nov 07. - Publication Year :
- 2016
-
Abstract
- The polarities of the cytoplasm and reactants were measured through dielectric spectroscopy, contact angle test, NMR, and FTIR to investigate the mechanisms underlying acid-catalyzed lipid transesterification in wet microalgal cells subjected to microwave irradiation. Organics with apolar functional groups in the cytoplasm decreased the contact angle of methanol against triglyceride by 13.92°, which subsequently increased transesterification efficiency by 2.4 times. The microalgal biomass, given its higher hydrophilicity index of 1.96 than lipids, was more accessible to hydrophilic alcohols, which subsequently promoted transesterification. Water in the cytoplasm promoted the dielectric constant of methanol and increased the contact angle of methanol against triglyceride by 20.51°, which subsequently decreased transesterification efficiency by 72.6%. The inhibitory effect of water on transesterification weakened with the prolonged carbon lengths of the alcohols because of decreased polarity. Microwave decreased the electric constants of alcohols and reduced the polarity difference between alcohols and lipids, thereby improving transesterification efficiency.<br /> (Copyright © 2015 Elsevier Ltd. All rights reserved.)
- Subjects :
- Biomass
Catalysis drug effects
Chlorella cytology
Chlorella drug effects
Chlorella radiation effects
Electricity
Electromagnetic Fields
Esterification drug effects
Fatty Acids metabolism
Methanol pharmacology
Microalgae drug effects
Triglycerides metabolism
Cytoplasm metabolism
Lipids chemistry
Microalgae cytology
Microalgae radiation effects
Microwaves
Water chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1873-2976
- Volume :
- 200
- Database :
- MEDLINE
- Journal :
- Bioresource technology
- Publication Type :
- Academic Journal
- Accession number :
- 26562690
- Full Text :
- https://doi.org/10.1016/j.biortech.2015.11.005