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Organic & Biomolecular Chemistry Vol -8

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Effect of complementary small molecules on the properties of bicomponent hydrogel of riboflavin

Content Provider	Royal Society of Chemistry (RSC)
Author	Esterrani, Aluri Saha, Abhijit Roy, Bappaditya Nandi, Arun K.
Copyright Year	2011
Abstract	Three new bicomponent hydrogels of riboflavin (R) with salicylic acid (S), dihydroxybenzoic acid (B) and acetoguanamine (D) in 1 : 1 molar ratio have been reported. FTIR and UV-vis spectra suggest formation of H-bonded complexes in 1 : 1 molar ratio of the components. The network consists of tape, bar and helical tubes for RB11, RS11 and RD11 systems, respectively. Reversible first order phase transition and invariant storage modulus (G′) with angular frequency (ω) characterise the systems as forming thermoreversible hydrogels. The RD11 gel has the highest gel melting temperature and highest critical strain compared to other gels. WAXS study indicates different crystal structures for different gels. NMR spectra reveals higher shielding of protons in RD11 gel suggesting better π-stacking compared to RS11 and RB11 gels. RD11 gel shows two-fold enhancement of photoluminescence (PL) intensity with a substantial red shift of emission peak but RB11 and RS11 gels show PL-quenching. The gels exhibit a small decrease in lifetime and the PL property is very much temperature and pH dependent. So the complementary molecules have a pronounced effect on morphology, structure, stability and optical property of riboflavin gels.
Starting Page	770
Ending Page	776
Page Count	7
File Format	HTM / HTML PDF
ISSN	14770520
Volume Number	9
Issue Number	3
Journal	Organic & Biomolecular Chemistry
DOI	10.1039/c0ob00670j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Acetoguanamine Photoluminescence Riboflavin Concentration WAXS Dihydroxybenzoic acid FTIR Red Bull RB11 PH Nuclear magnetic resonance Angular frequency Phase transition
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Physical and Theoretical Chemistry

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