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98 การเพิ่่�มปร่มาณสารประกอบฟีีนอลิ่กในพิ่ืชด้้วยแสง : หลิักการแลิะแนวทางปฏิ่บัติ่

Abstract: Enhancement of Phenolic Compounds Contents in Plants via the
Use of Lights : Principles and Practice

Professor Dr. Sakamon Devahastin
Associate Fellow of the Academy of Science,
The Royal Society of Thailand.
Dr. Laksika Ngamwonglumlert
Department of Food Engineering Faculty of Engineering,
King Mongkut’s University of Technology Thonburi
Phenolic compounds are among the important secondary metabolites

that exhibit health benefits. To enhance biosynthesis of plant phenolics,
environmental stress is usually applied either during cultivation or postharvest
storage since such a stress normally causes an increase in the formation of
reactive oxygen species (ROS), which can damage proteins, DNA and lipids in
plant cells through the oxidation process. To scavenge excess ROS and prevent
oxidative damage, various types of antioxidants, including phenolic compounds,
are synthesized. Among many environmental factors, light is an easily controllable
factor that directly influences photosynthesis, growth, plant development and
biosynthesis of secondary metabolites. Because plant photoreceptors respond
to radiations in the ranges of visible light, ultraviolet, and infrared, lights in these
ranges are usually used to enhance phenolics synthesis. This article briefly

reviews the effects of light at different wavelengths and doses on changes
in phenolics content and activities of key enzymes responsible for phenolics
biosynthesis. Appropriate wavelength, intensity and duration of irradiation not
only help increase phenolics content but can also improve plant quality,
e.g., size and shape, as well.

Keywords: Light intensity, Wavelength, Phenylalanine ammonia lyase, Reactive
oxygen species, Phenolics compounds

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