Physico-chemical Analysis of Fruit Juices by Using Self-Made Low Cost Portable Ohmic Heater

The conventional methods of preservation like refrigeration, adding preservatives etc. are some of the methods but they might have side effects on environment like refrigeration on ozone layer, and on consumers like preservatives affects the health. In this experiment firstly ohmic heater was constructed having 3 ltrs and then 2 ltrs of capacity and finally they were discarded because they need large surface area and require large quantity of juice. Finally we prepared heater of 1.5 ltrs capacity which gave good electrical conductivity and it was economical also. The juices were stored in PET bottles at refrigeration temperature and physico+chemical analysis was done at weekly intervals over a period of 21 days. In parallel study, another spicemen of juices was stored at ambient temperature and checked at regular intervals. TSS, pH, Titrable acidity and Vitamin C content were checked after heating. The juices were heated for the 5 minutes, 10 minutes and 15 minutes respectively and then their TSS, pH, Titrable acidity, Vitamin C, sensory analysis were checked at weekly interval stored in both refrigerated and ambient conditions. Significant difference in pH, of sweet orange and pomegranate juice refrigerated and ambient condition were observed. It was noticed that TSS, and Titrable acidity Pomegranate and sweet orange juice under ambient and refrigerated increased significantly, whereas vitamin C showed the decreasing pattern in both the conditions.

Self-made low cost portable ohmic heater was designed.

Sweet orange and pomegranate juices were analysed for various parameters tested on portable ohmic heater.