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- Title
Effect of Air- and Oven-Drying on the Activity of Polyphenol Oxidases and Peroxidases in the Leaves of Gynura procumbens.
- Authors
Jia Jun Fung; Yau Yan Lim
- Abstract
Gynura procumbens has been well known for its various medicinal properties such as being an antioxidant. It would be beneficial to be able to dry and preserve the leaves of G. procumbens for commercial utilisation. However, enzymes such as polyphenol oxidases (PPO) and peroxidases (POD) may degrade the antioxidants present. It was found previously that air-drying at ambient temperatures, where PPO and POD activity should be at its optimal temperature, did not significantly reduce the antioxidant activities in G. procumbens. However, oven-drying at 50°C and 100°C reduced the antioxidant properties significantly. Therefore, this study aims to determine the effect of different methods of drying leaves on the enzyme activity of PPO and POD, such as open ambient air-drying, drying in a desiccator at 25% relative humidity, oven-drying at 50°C and 100°C. Results show that all methods of drying that were used fully diminished the enzyme activity of PPO. However, for POD, only oven-drying at 100°C and blanching were able to fully diminish the enzyme activity. Additionally, the desiccator shortened the drying time of open-air-drying by 2-5 days. For commercial utilisation, drying the leaves in a lowered relative humidity would be the best choice.
- Subjects
MEDICINAL plants; POLYPHENOL oxidase; PEROXIDASE
- Publication
Reinvention: An International Journal of Undergraduate Research, 2016, Vol 9, Issue 2, p2
- ISSN
1755-7429
- Publication type
Article