Electrochemical studies on speciation of tin-amino acid complexes

การศึกษาการกระจายชนิดของสารประกอบเชิงซ้อนของดีบุกกับกรดอะมิโนบางชนิดโดยวิธีทางเคมีไฟฟ้า

Name: Pravitra Chandranupap

MeSH: Amino acids

MeSH: Electrochemical analysis

MeSH: Tin compounds

Abstract: The equilibria of tin (2+) complexes with some amino acids namely, glycine, dl-alanine, l-phenylalanine and l-cysteine were obtained as a representative for the studies of tin (2+)-biomolecules interaction. Tin (2+)-amino acid systems in the medium of 1.0 M KC1 at 25 degree C were studied by means of electrochemical techniques such as potentiometric pH titration and polarography. In potentiometric pH titration, the studies were performed in the tin (2+) to amino acid concentration ratio (M:L) range from 1:50 to 1:1. Low initial concentration of tin (2+) was used in the titration to avoid precipitation in the solution systems. The most reasonable potentiometric pH data were evaluated with the generalized non-linear curve fitting program, MINIQ. The technique and computer program were also confirmed by determining the amino acid protonation constants. The orders of magnitude of the formation constants which obtained from the best fitted potentiometric data in M:L ratio ranges from 1:50 to 1:10 and same complex type, were: l-cysteine > dl-alanine > glycine > l-phenylalanine Polarographic studies were made in the same condition of potentiometric pH titration in order to compare the result of the two different electrochemical techniques. These gave results consistent with potentiometric pH technique in the existence of complex species at the different pH ranges.

Mahidol University. Mahidol University Library and Knowledge Center

Address: NAKHONPATHOM

Email: liwww@mahidol.ac.th

Name: Waret Veerasai

Role: Thesis Advisors

Name: Prapin Wilairat

Role: Thesis Advisors

Name: Yuwadee Shiowattana

Role: Thesis Advisors

Created: 1991

Modified: 2561-02-19

Issued: 2018-02-17

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Physical Chemistry

Grantor: Mahidol University

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