Enhancement of the fluorescence intensity of dansyl amino acids in aqueous media and its application to assay of amino acids

The influence of the molecular cavity protection on degradation processes of bioorganic compounds quercetin and luteolin used as the original dyes in old tapestries was studied. The degradation processes were studied by electrochemical methods in aqueous media. The products of the exhaustive electrolysis were separated and identified by GC-MS analysis. Cyclic voltammetry characteristics indicate that the inclusion complex is formed. The inclusion affects the redox potentials of both oxidation waves related to the different dissociation forms of the flavonoid molecule. It was shown that decomposition products formed by the oxidation of quercetin are stabilized in the cavity of β-cyclodextrin, including the main oxidation product 2(3′,4′-dihydroxybenzoyl)-2,4,6-trihydroxybenzofuran-3(2H)-one. The formation of the 1:1 inclusion complex of luteolin with β-cyclodextrin is supported by the enhancement of fluorescence intensity. In the case of quercetin, a decrease of fluorescence intensity occurs when 1:1 inclusion complex with β-cyclodextrin is formed.

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Alum Catalyzed Simple, Efficient, and Green Synthesis of 2-[3-Amino-5-methyl-5-(pyridin-3-yl)-1,5-dihydro-4H-1,2,4-triazol-4-yl]propanoic Acid Derivatives in Aqueous Media

The Scientific World JOURNAL ◽

10.1155/2013/716389 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 4

Author(s):

Harshita Sachdeva ◽

Diksha Dwivedi ◽

Rekha Saroj

Keyword(s):

Amino Acids ◽

Green Chemistry ◽

Green Synthesis ◽

Aqueous Media ◽

Propanoic Acid ◽

Ft Ir ◽

C Nmr

Alum (KAl(SO4)2·12H2O) is an inexpensive, efficient, and nontoxic catalyst used for the synthesis of 2-[3-amino-5-methyl-5-(pyridin-3-yl)-1,5-dihydro-4H-1,2,4-triazol-4-yl]propanoic acid derivatives in aqueous media by the reaction of 3-acetyl pyridine(1), amino acids(2)/(6), and thiosemicarbazide(4)at 80°C. This methodology offers significant improvements for the synthesis of products with regards to the yield of products, simplicity in operation, and green aspects by avoiding toxic catalysts which uphold the motto of green chemistry. Synthesized compounds have been characterized by FT-IR,13C NMR, and1HNMR spectroscopy.

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Chiral separation of dansyl-amino acids in a nonaqueous medium by capillary electrophoresis

Journal of Chromatography A ◽

10.1016/0021-9673(96)00003-9 ◽

1996 ◽

Vol 737 (2) ◽

pp. 263-272 ◽

Cited By ~ 73

Author(s):

István E. Valkó ◽

Heli Sirén ◽

Marja-Liisa Riekkola

Keyword(s):

Amino Acids ◽

Capillary Electrophoresis ◽

Chiral Separation ◽

Nonaqueous Medium ◽

Dansyl Amino Acids

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Zinc-mediated carbon radical addition to glyoxylic imines in aqueous media for the synthesis of α-amino acids

Organic & Biomolecular Chemistry ◽

10.1039/b418726a ◽

2005 ◽

Vol 3 (6) ◽

pp. 1124-1128 ◽

Cited By ~ 31

Author(s):

Masafumi Ueda ◽

Hideto Miyabe ◽

Hisako Sugino ◽

Takeaki Naito

Keyword(s):

Amino Acids ◽

Aqueous Media ◽

Radical Addition

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Cationic β-cyclodextrin-modified hybrid magnetic microspheres as chiral selectors for selective chiral absorption of dansyl amino acids

New Journal of Chemistry ◽

10.1039/c4nj00030g ◽

2014 ◽

Vol 38 (8) ◽

pp. 3630-3636 ◽

Cited By ~ 21

Author(s):

Jingwei Wu ◽

Ping Su ◽

Danhua Guo ◽

Jun Huang ◽

Yi Yang

Keyword(s):

Amino Acids ◽

Magnetic Microspheres ◽

Dansyl Amino Acids ◽

Chiral Selectors

Chiral selective magnetic microspheres based on imidazolium cationic-modified β-CD derivatives have been developed for direct enantioseparation of dansyl amino acids.

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