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.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Huang R,Cheng J,Qiu Y,Li T,Zhou J,Cen Kdoi
10.1016/j.biortech.2015.11.005subject
Has Abstractpub_date
2016-01-01 00:00:00pages
738-43eissn
0960-8524issn
1873-2976pii
S0960-8524(15)01530-8journal_volume
200pub_type
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