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Chu Dinh Kinh
Institute of Chemistry, Vietnamese Academy of Science and Technology
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Mathematics

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CHARACTERIZATION OF ALGINATE PREPARED FROM BROWN SEAWEEDS IN THUA THIEN-HUE PROVINCE, VIETNAM Tran Vinh Thien; Chu Dinh Kinh; Tran Thai Hoa; Dinh Quang Khieu
ASEAN Journal on Science and Technology for Development Vol. 25 No. 2 (2008): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (403.67 KB) | DOI: 10.29037/ajstd.273

Abstract

The characterization of alginate prepared from brown seaweeds in TT-Hue province of Vietnam was investigated. Composition and the sequential structure of alginate were determined by 1HNMR, 13C-NMR, TOCSY, 1H-1H COSY, and 1H-13C-HSQC spectrum. It is found that alginate with molecular weight around 101 KDa is composed of homopolymeric regions of M and G blocks, interspersed with very small amount of regions of alternating structure of MG block.  This information is essential for application guideline of alginate in TT-Hue province.   
APPLICATION OF NMR IN THE INVESTIGATION OF DYNAMIC TAUTOMERISM OF 4(3H)-QUINAZOLINONE SYSTEM Pham Thi Thanh My; Chu Dinh Kinh; Thanh Thi Thu Thuy; Nguyen Ngoc Vinh; Nguyen Thi Phuong Chi
ASEAN Journal on Science and Technology for Development Vol. 25 No. 2 (2008): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (352.424 KB) | DOI: 10.29037/ajstd.275

Abstract

Tautomerism of 4(3H)-quinazolinone system with [(2-hydroxyphenyl)methylene]-2-(4oxoquinazolin-3(4H)-yl)acetohydrazide and N’-[(1E)-(4-hydroxy-3-methoxyphenyl)methylene]-2-(4-oxoquinazolin-3(4H)-yl)acetohydrazide as two representative compounds was investigated on the basis of 1H NMR method at coalescence with the help of line formprogramme. The dynamic parameters such as k, Ea, DG*, DH*, DS* were fully calculated with high reliability.
Co-Authors Dinh Quang Khieu Nguyen Ngoc Vinh Nguyen Thi Phuong Chi Pham Thi Thanh My Thanh Thi Thu Thuy Tran Thai Hoa Tran Vinh Thien