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Performance of UV Pasteurization with Quartz Glass Sleeve on Physicochemical Properties and Microbial Activity of Pineapple Juice
Author(s) -
Mansor Atikah,
Shamsudin Rosnah,
Mohd Adzahan Noranizan,
Hamidon Mohd Nizar
Publication year - 2017
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.12263
Subject(s) - quartz , pasteurization , chemistry , fused quartz , glass recycling , shelf life , materials science , composite material , food science
Quartz glass has characteristics of high purity, high thermal resistance, high resistivity and high dielectric strength. Currently, majority of research in this area is discussing about the UV reactor equipped by a quartz glass sleeve. The aim of this research is to investigate the effect of quartz glass sleeve on the physicochemical properties and microbial activity of pineapple fruit juice during storage. UV ‐ C radiation is one of the nonthermal technologies that have been introduced in the food industry. UV ‐ C has the advantage of no known toxic or significant nontoxic by‐products formed during treatment. The UV reactor that is enclosed by quartz glass can maintain the quality of pineapple juice in terms of color ( L * value, chroma and hue angle), total soluble solids, pH and ascorbic acid content. All of the physicochemical properties of pineapple juice underwent significant changes with storage time. Moreover, the UV reactor that is enclosed by quartz glass is able to extend the shelf life of juice for up to 5 weeks and achieve a 5 log reduction of S almonella typhimurium in the juice after treatment. Practical Applications Quartz glass or fused quartz is widely used in thermophysical measurements for calibration and verification of thermal devices. Quartz glass was permeable for wavelength less than 350 nm. Therefore, the UV ‐ C radiation was able to transmit through the quartz glass. Quartz glass was installed in UV reactor to avoid direct contact of the surface of the lamp with the treated juice. Quartz glass is used to minimize the heat from the UV lamp being exposed to the juice.