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BIO FUEL
Algal residue - an alternative carbon resource for pharmaceuticals and polyesters
by Staff Writers
Tokyo, Japan (SPX) Apr 13, 2017


Algal residue, commonly discarded after extraction of oil, can be used to produce industrial chemicals alkyl levulinate and alkyl lactate. Image courtesy Tokyo Institute of Technology.

Microalgae have received much attention in biomass production due to many strains having a high biomass productivity per unit time and per unit area. Algae produce high levels of oil as well as carbohydrates, occurring mainly in the form of starch.

They can survive in unfavorable, nutrient deficient conditions, and can be propagated industrially without using farmland. Oil derived from algae has recently been adopted for use in jet fuels and biodiesel.

Previously overlooked, however, was the starch remaining in algal cells after oil extraction. Tokyo Tech researcher Sho Yamaguchi and colleagues found that this starch can be converted into alkyl lactate and alkyl levulinate, important chemicals in the production of pharmaceuticals, additives, and polyesters.

Two molecules of lactic acid can be dehydrated to lactone lactide and subsequently polymerized to either atactic or syndiotactic polylactide, which are biodegradable polyesters. Levulinic acid, on the other hand, is used as a precursor for pharmaceuticals and additives like plasticizers, as well as a starting material for a wide number of compounds.

The researchers found that using homogeneous Sn(OTf)2 led to an increase in the yield of alkyl levulinate, while using SnBr4 allowed for the selective production of alkyl lactate.

Their results show that algae can be utilized not only as a biofuel source, but also as a carbon resource for chemicals that are applied in a wide range of industries. This could lead to algae biomass becoming a new alternative carbon resource to fossil fuels.

Yamaguchi and colleagues examined various homogeneous catalysts to optimize the selective production of methyl levulinate and methyl lactate. They state, however, that further development of heterogeneous catalysts is needed before the process can be put to practical use.

Additionally, they recognize the importance in understanding the underlying mechanisms of starch production in algae, as doing so could lead to further advances in algal biomass production.

Sho Yamaguchi*1, Yuuki Kawada2, Hidetaka Yuge2, Kan Tanaka3,4, Sousuke Imamura3,4, Development of New Carbon Resources: Production of Important Chemicals from Algal Residue, Scientific Reports, 2017, DOI:10.1038/s41598-017-00979-y

BIO FUEL
For Palestinian family, an udder-ly unique power source
Dahriya (AFP) April 12, 2017
Power comes in many forms, but Kamal al-Jebrini's family looked to where others may fear to tread for a new source of it: cow dung. The family has begun recycling waste from its cows to produce electricity for one of the largest Palestinian dairy plants and even to provide power to some houses. They discovered the idea during trips abroad and decided cow dung that would otherwise mainly ... read more

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Tokyo Institute of Technology
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