Related Experiment Video
Updated: Jan 27, 2026

Making Record-efficiency SnS Solar Cells by Thermal Evaporation and Atomic Layer Deposition
Published on: May 22, 2015
Thermal Resistance of Microorganisms and Polyphenol Oxidase as Related to Solar Pasteurization of Concord Grape Juice
H K Leung1, B G Swanson1, T L Aw1
1Department of Food Science and Technology and Department of Agricultural Engineering, Washington State University, Pullman, Washington 99164.
Abstract:
Pasteurization conditions for grape juice were examined and the concept of pasteurizing grape juice utilizing solar energy was explored in this study. The z-values of four selected micro-organisms in grape juice were approximately 5-8 C, whereas polyphenol oxidase in fresh grapes had a z-value of 8.0 C at pH 3 .4. Using a 0.5 m2 solar collector test module constructed for this study, 2.5 h were required to heat the grape juice from 10 to 85 C. The solar pasteurized juice and commercially pasteurized juice were different in flavor and color but not in pH, titratable acidity or soluble solids.
More Related Videos
Related Concept Videos
Kendall's Coefficient of Concordance
Pancreatic Juice and Secretion
When acidic chyme from the stomach enters the duodenum, it triggers the release of secretin, a hormone that prompts pancreatic juice secretion. After a fatty meal, cholecystokinin, another hormone, stimulates gallbladder contraction and enhances enzyme-rich...
Types of Microorganisms
Mutations in Microorganisms
Environmental Applications of Microorganisms
Microorganisms in Medicine and Therapeutics

