Effect of Hofmeister series salts on Absorptivity of aqueous solutions on Sodium polyacrylate

14th International Conference on Science, Engineering and Technology

自然科学;工业技术

Korrapati, Swathi^1,3 ; Pullela, Phani Kumar^1,2 ; Vijayalakshmi, U.^3

Bigtec Pvt Ltd, 59th C cross, Rajajinagar, Bangalore

560010, India^1

CMR Institute of Technology, Department of Chemistry, Bangalore Karnataka

560037, India^2

School of Advanced Sciences, VIT University, Vellore. Tamil Nadu

632014, India^3

关键词: Ammonium Sulfate;    Chaotropic agents;    Fluorescence characteristics;    Fluorescence intensities;    Hofmeister series;    Sodium polyacrylates;    Water absorptivity;    Water structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/263/2/022028/pdf
DOI  :  10.1088/1757-899X/263/2/022028

来源: IOP

【 摘 要 】

Sodium polyacrylate (SPA) is a popular super absorbent commonly used in children diapers, sanitary pads, adult diapers etc. The use of SPA is in force from past 30 years and the newer applications like as food preservant are evolving. SPA is recently discovered by our group for improvement of sensitivity of colorimetric agents. Though the discovery of improvement in sensitivity is phenomenal, the mechanism still remains a puzzle. A typical assay reagent contains colorimetric/fluorescent reagents, buffers, salts, stabilizers etc. These chemicals are known to influence the water absorptivity of SPA. If we were to perform chemical/biochemical assays on SPA absorbed reagents effect of salts and other excipients on colorimetric/fluorescence compounds absorbed on SPA is very important. The hofmeister series are standard for studying effect of salts on permeability, stability, aggregation, fluorescence quenching etc. We recently studied affect of urea, sodium chloride, ammonium sulfate, guanidine thiocayanate on fluorescence characteristics of fluorescence compounds and noted that except urea all other reagents have resulted in fluorescence quenching and urea had an opposite effect and increased the fluorescence intensity. This result was attributed to the different water structure around fluorescent in urea solution versus other chaotropic agents.