Polyvinyl alcohol : A taste sensing material

Abstract There are reports of taste sensor fabrication by incorporating lipids in a PVC matrix. We have taken an attempt to prepare a taste sensor material by using a functionalized polymer. Polyvinyl alcohol (PVA) has been modified to fabricate the sensor material. The research work covers polymer membrane preparation, morphology study, structural characterization of the membrane, and study of the taste sensing characteristics. The membrane was prepared by cross-linking polyvinyl alcohol with maleic acid. The cross-linked PVA was phosphorylated with POCl 3 . Polyvinyl alcohol membranes of suitable thickness were thus prepared with a good threshold sensing value and less swelling in water. FTIR spectroscopic analysis, XRD analysis and optical microscopy were done to get an idea about the structure and morphology of the polymer membranes. The sensor characteristics like temporal stability, response stability, response to different taste substances, and reproducibility of sensing performance were studied. The threshold concentrations of the membrane for Q-HCl, HCl, MSG, NaCl and sucrose were 0.01, 0.001, 0.08, 1, and 1 mM, respectively. These membrane threshold concentrations are below human threshold concentrations, which are 0.03, 0.9, 1.6, 30 and 170 mM for Q-HCl, HCl, MSG, NaCl and sucrose, respectively.

[1]  Kenshi Hayashi,et al.  Effect of several sweet substances on the electrical characteristics of a dioleyl phosphate-millipore membrane , 1989 .

[2]  Kenshi Hayashi,et al.  Electric characteristics of lipid-modified monolayer membranes for taste sensors , 1995 .

[3]  S. V. Mello,et al.  An electronic tongue using polypyrrole and polyaniline , 2003 .

[4]  K. Mikhelson.  Ion-selective electrodes in PVC matrix , 1994 .

[5]  K. Kurihara,et al.  Pysicochemical studies of taste reception. V. Suppressive effect of salts on sugar response of the frog. , 1976, Biochimica et biophysica acta.

[6]  K. Hayashi,et al.  Multichannel taste sensor using lipid membranes , 1990 .

[7]  K. Hayashi.  Sensing of Umami Taste and Synergistic Effects with Synthetic Lipid Membranes , 1989 .

[8]  Kiyoshi Toko,et al.  Discrimination of Taste of Amino Acids with a Multichannel Taste Sensor , 1993 .

[9]  D. Shaw,et al.  Introduction to colloid and surface chemistry , 1970 .

[10]  S. Yamaguchi.  The Synergistic Taste Effect of Monosodium Glutamate and Disodium 5′-Inosinate , 1967 .

[11]  Kiyoshi Toko,et al.  Effect of Bitter Substances on a Model Membrane System of Taste Reception , 1986 .

[12]  W. Schöniger.  Eine mikroanalytische Schnellbestimmung von Halogen in organischen Substanzen , 1955 .

[13]  Kiyoshi Toko.  Multichannel Taste Sensor with Lipid Membranes. , 1990 .

[14]  M. Teubner,et al.  Electrostatic interactions at charged lipid membranes. I. Effects of pH and univalent cations on membrane structure. , 1976, Biophysical chemistry.

[15]  Lippincott Williams Wilkins,et al.  Handbook of Physiology , 1960, Neurology.

[16]  Charles Tanford,et al.  The hydrophobic effect , 1980 .