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Determination of Quality and Spoilage of Milk by Synthesized Polypyrrole– A g Nanocomposite Fiber at Room Temperature
Author(s) -
Pirsa Sajad,
Zandi Mohsen,
Almasi Hadi
Publication year - 2016
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/jfpe.12219
Subject(s) - polypyrrole , materials science , nanocomposite , fiber , scanning electron microscope , polyester , food spoilage , chemical engineering , polymerization , silver nitrate , fourier transform infrared spectroscopy , nuclear chemistry , composite material , polymer , chemistry , biology , bacteria , engineering , genetics
Conducting polypyrrole/silver ( PPy – A g) nanocomposite was synthesized by dip coating polymerization of pyrrole in the presence of silver nitrate as precursor and F e C l 3 as oxidant on the polyester fibers at room temperature. Nanocomposite was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy ( SEM ) to study the effect of silver nanoparticles embedded into PPy on the morphology, structure and conductivity of the conducting polypyrrole. The SEM results show that the morphology of the PPy – A g powder is of cabbage shape and porous, and PPy – A g on the fiber surface is uniformly seeded and packed. The PPy – A g fiber was used as a pH sensor in liquid phase for milk spoilage investigation. The PPy – A g fiber used was a simple, low cost and reversible sensor for determination of water and milk pH from 3 to 7, so we can determine spoilage of milk by this sensor. Three same PPy – A g sensors in different days were studied and relation standard deviation <5 was obtained. Practical Applications Polypyrrole– A g nanocomposite was chemically deposited on polyester fibers. When PPy – A g fiber was exposed to H + , there was an increase in the current. The PPy – A g was doped with C l − , resulting in a conductive material suitable for application in milk pH sensors. The PPy – A g fiber was used as a pH sensor in liquid phase for milk spoilage investigation. The sensors are easy to make, and the response was fast, reversible and reproducible. PPy – A g fiber sensor includes detection based on the pH and current change levels. Simplicity of procedure, speed, range of detection, accuracy of results and cost of equipment are the critical factors in effectively discerning spoilage in milk that PP y– A g fiber sensor has the most factors of milk spoilage determination.