Electrical conductivity and performance evaluation of verjuice concentration process using ohmic heating method

2021 ◽  
Author(s):  
Mutlu Cevik
Keyword(s):  
Electrical Conductivity ◽  
Performance Evaluation ◽  
Ohmic Heating ◽  
Heating Method ◽  
Concentration Process ◽  
And Performance

Correlation of Electrical Conductivity and Thermal Properties of Native Starch during Ohmic Heating

2011 ◽  
Vol 7 (5) ◽  
Author(s):  
Lam-Lam Wong ◽  
Yong-Wei Xu ◽  
Zhan-Hui Lu ◽  
Li-Te Li
Keyword(s):  
Electrical Conductivity ◽  
Room Temperature ◽  
Ohmic Heating ◽  
Heating Process ◽  
Rapid Evaluation ◽  
Scanning Calorimetry ◽  
Heating Method ◽  
Starch Gelatinization ◽  
On Line ◽  
Water Ratio

Electrical conductivity of starch suspension during ohmic heating was applied to analyze the starch gelatinization process. Native starches from wheat, corn, rice, potato, sweet potato, and pea were prepared on a starch to water ratio of 1:3 (w/w) with adding 0.05 M potassium chloride. A laboratory scale ohmic heating setup was designed to heat the starch suspension from room temperature to 90°C at a controlled heating rate of 10°C/min operating at 50 Hz and 110 V. The results show that starch gelatinization temperatures could be precisely calculated from electrical conductivity of starch suspension during ohmic heating process. The starch gelatinization temperatures based on ohmic heating were comparable to those measured by differential scanning calorimetry (DSC). Highly significant correlation of onset temperature (R=0.9972) and peak temperature (R=0.9950) were observed. The ohmic heating method could provide an alternative way to DSC with a promising potential for on-line and rapid evaluation of starch gelatinization temperatures.

The Effects of Pasteurization by Conventional and Ohmic Heating Methods and Concentration Processes on the Madan (Garcinia Schomburgkiana Pierre) Juice Properties

2020 ◽  
Vol 36 (2) ◽  
pp. 205-219
Author(s):  
Krittiya - Khuenpet ◽  
Weerachet - Jittanit
Keyword(s):  
Electrical Conductivity ◽  
Mathematical Models ◽  
Color Change ◽  
Ohmic Heating ◽  
Conventional Heating ◽  
Heating Method ◽  
Electrical Conductivities ◽  
Juice Concentrate ◽  
Filtration Step

HighlightsThis research proved that Madan juice should be filtered before pasteurization in order to be more palatable for consumer.Madan juices and its concentrates can be efficiently heated by ohmic method due to their high electrical conductivities.Mathematical models developed in this study can accurately predict the electrical conductivity of the Madan juice during ohmic heating.This research proved that the quality of pasteurized Madan juice concentrates was rather steady during 60 days of storage.Abstract.Madan is a native fruit of the Southeast Asian region. The objectives of this research were: 1) to investigate the effect of pasteurization methods on the qualities of Madan juices and 2) to examine the influence of ohmic heating on the qualities and storage stability of pasteurized and concentrated juice compared to conventional heating method. It appeared that Madan juices (5-27.2 °Brix) can be heated by ohmic method due to high electrical conductivities (1.37-4.74 S.m-1). Mathematical models developed in this study can precisely predict the electrical conductivity of Madan juice. Filtration step and pasteurization condition of 95°C for 15 s should be applied in Madan juice processing because they provided the highest sensorial scores and the lowest color change. The continuous-mode machine provided the lightest color with low redness and yellowness values. Quality changes of Madan juice concentrate samples pasteurized using double jacket kettle and ohmic heating method were diminutive during 60 days of storage. Keywords: Concentration, Juice, Madan, Ohmic heating, Pasteurization.

Design and performance evaluation of an ohmic heating unit for thermal processing of highly viscous liquids

2008 ◽  
Vol 86 (6) ◽  
pp. 626-632 ◽  
Author(s):  
S. Ghnimi ◽  
N. Flach-Malaspina ◽  
M. Dresch ◽  
G. Delaplace ◽  
J.F. Maingonnat
Keyword(s):  
Performance Evaluation ◽  
Thermal Processing ◽  
Ohmic Heating ◽  
Heating Unit ◽  
Viscous Liquids ◽  
And Performance
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