第432回触媒科学研究所コロキウム

Selective Porous Catalysts for Upcycling Waste fromPetroleum and Pulping Industrials
Dr. Duangamol N. Tungasmita(Department of Chemistry, Chulalongkorn University)

2020年3月9日（月）15：00—16：30
創成科学研究棟 5階大会議室
http://www.cat.hokudai.ac.jp/access.html
Nowadays, waste upcycling has much attentions from society due to the global warming effect anddepletion of crude oil sources. Many types of waste such as PP plastic cup, natural abundant lignin,
and waste from the phenol-production plant, will be used as starting materials in the upcyclingtransformation process to achieve more valuable chemical compounds.
In this seminar, we will discuss about the pore size-dependent transformation mechanism ofpolypropylene plastic cups to gasoline or gas fuels. It was found that the mesoporous Al-SBA-15
catalyst gave a major product as a liquid fraction, while microporous H-MCM-22 catalyst promoted
liquified hydrocarbons. For lignin, i.e. phenolic abundant polymer in nature, it was hydrothermallydepolymerized to benzenediol derivatives, and especially to catechol, compared to non-catalytic
cracking. The acidity and porosity of the catalyst played an important role in the selectivity for catechol.
In case of the anisole, a by-product of polycarbonate production, it was selective alkylized to tertbutyl anisole products which can be used as antioxidants and stabilizers in polymerization processes.
The ZSM-5 showed a dominating property of para-selective with a low product yield, while MCA gave
a double conversion to ZSM-5 but non-selective to any isomers. The outcomes of this research exhibit
the development of micro- and mesoporous hybrid materials which provide a high yield and dominate
para-selective product.
B.Sc. (Chemistry), Chulalongkorn University, 1996
M.Sc. (Organic Chemistry), Chulalongkorn University, 1998
Ph.D. (Materials Science and Chemical Engineering), Yokohama National University, 2003 under
supervision of Prof. Takashi Tatsumi
問合せ先： 触媒科学研究所・福岡淳（fukuoka@cat.hokudai.ac.jp・011-706-9140）

432nd Institute for Catalysis (ICAT) Colloquium

第432回触媒科学研究所コロキウム

Enzymatic transformation of sucrose for the productionof polysaccharides and oligosaccharides of glucose andfructose for food and functional food applications

Dr. Rath Pichyangkura(Department of Chemistry, Chulalongkorn University)

2020年3月9日（月）15：00—16：30
創成科学研究棟 5階大会議室
http://www.cat.hokudai.ac.jp/access.html
Thailand, an agricultural country, is one of the world largest producer of food and agricultural products. Sugar
is one the most important products of Thailand is the world’s second largest producer of sucrose. However,sucrose is normally sold as bulk low price. Conversion of sucrose into higher value new products is of greatinterest. In this work we use sucrose as a substrate for the production of polysaccharides and oligosaccharidesof glucose and fructose, using two groups of glycosyltranferases; glucansucrase and fructansucrase. We haveengineered and expressed four glucansucrases; alternansucrase and dextrandsucrase from Leuconostoc citreum
ABK-1, reuteransucrase from Lactobacillus reuteri 121 and mutansucrase from Streptococus sorbinus. They
were successfully used for the production of glucans and oligosaccharides of glucan. Moreover, we havesuccessfully engineered and expressed levansucrase and inulosucrase that catalyzes the production of fructanand fructan oligosaccharides with different product size ranges. Together with other biotechnological processes
for the production of FOS from sugar, we successfully produced FOS that can be use as functional food,possessing probiotic property, with a prebiotic score equal or higher that commercialized products.
Inconclusion, we have generated a technology platform for enzymatic sugar transformation into polysaccharides
and oligosaccharides using glucansucrase and fructansucrase, which can be used for the production ofpolysaccharides and oligosaccharides of glucose and fructose.
Dr.Rath Pichyangkura is a faculty member of the Department of Biochemistry, Faculty of Science, Chulalongkorn
University, Bangkok, since 1996. The major focus of his laboratory is on the enzymatic transformation ofcarbohydrate biomass in high value products, functional polysaccharides and oligosaccharides. He has beenworking with chitin-chitosan and their applications in plants and animal from 1998-present. Currently, his work
deals with carbohydrate engineering and enzymatic transformation of sucrose to useful products and productionof functional oligosaccharide from other carbohydrate containing biomass such as copra meal and palm wastes.

問合せ先： 触媒科学研究所・福岡淳（fukuoka@cat.hokudai.ac.jp・011-706-9140）

432th Institute for Catalysis (ICAT) Colloquium