Hydrophilic Indolium Cycloruthenated Complex System for Visual Detection of Bisulfite with a Large Red Shift in Absorption

Bisulfite, as an important additive in foodstuffs, is one of the most widely distributed environmental pollutants. The excessive intake of bisulfite may cause asthmatic attacks and allergic reactions. Therefore, the determination and visual detection of bisulfite are very important. Herein, a newly...

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Bibliographic Details
Published in:	Inorganic chemistry Vol. 55; no. 2; pp. 745 - 754
Main Authors:	Su, Xianlong, Hu, Rongrong, Li, Xianghong, Zhu, Jun, Luo, Facheng, Niu, Xuehu, Li, Mei, Zhao, Qiang
Format:	Journal Article
Language:	English
Published:	United States American Chemical Society 19-01-2016
Subjects:	Hydrophobic and Hydrophilic Interactions Indoles - chemistry Limit of Detection Magnetic Resonance Spectroscopy Ruthenium Compounds - chemistry Spectrophotometry, Ultraviolet Sulfites - chemistry
Online Access:	Get full text
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Summary:	Bisulfite, as an important additive in foodstuffs, is one of the most widely distributed environmental pollutants. The excessive intake of bisulfite may cause asthmatic attacks and allergic reactions. Therefore, the determination and visual detection of bisulfite are very important. Herein, a newly designed hydrophilic indolium cycloruthenated complex, [Ru(mepbi)(bpy)2]+ [1; bpy = 2,2′-bipyridine and Hmepbi = 3,3-dimethyl-1-ethyl-2-[4-(pyridin-2-yl)styryl]benzo[e]indolium iodide (3)], was successfully synthesized and used as a bisulfite probe. The bisulfite underwent a 1,4-addition reaction with complex 1 in PBS buffer (10 mM, pH 7.40), resulting in a dramatic change in absorption spectra with a red shift of over 100 nm and a remarkable change in solution color from yellow to pink. It is worth noting that this obvious bathochromic shift is rarely observed in the detection of bisulfite through an addition reaction. The detection limit was calculated to be as low as 0.12 μM by UV–vis absorption spectroscopy. Moreover, complex 1 was also used to detect bisulfite in sugar samples (granulated and crystal sugar) with good recovery.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0020-1669 1520-510X
DOI:	10.1021/acs.inorgchem.5b02210