Name : [in Japanese]
Location : [in Japanese]
Date : January 17, 2018 - January 18, 2018
Pages 27-28
In-situ transesterification of C. vulgaris with excess methanol was conducted by acid or alkaline catalyst at 60 °C for 90 min. By using an alkaline catalyst, transesterification was completed at rather lower concentrations of catalyst ([OH-]=5-25N). At higher hydroxyl concentrations than the range, FAME yield decreased probably due to successive soap formation. By using an acidic catalyst, a higher concentration range than 40 N of proton was required for completion of transesterification. This trend was observed by 100 N of proton. At lower transesterification conversion range, C16:0 and C18:1 were transesterified preferably than others regardless of catalyst type, alkaline or acidic. Soap formation during transesterification by alkaline catalyst consumed C18:3 more slowly than others. These two trends were also observed by using oil extracted from C. vulgaris. Therefore, this selective transesterification observed for C. vulgaris is not originated from the cell structure.
