About us



Study of Surface Morphology of Low-Pressure Plasma Treated Rice by SEM and Contact Angle Measurement

Category : Biological Science
Author : W. Arworn, P. Rintarak, S. Khamrat, W. Chaiwat, R. Wongsagonsup, M. Suphantharika, S. Dangtip*
Email : somsak.dan@mahidol.edu
Keyword : Low-pressure plasma, rice, morphology, contact angle
Volume : Microsc. Microanal. Res. 2017 30(1)
DOI Number : 10.14456/microsc-microanal-res.2017.8
Download Start & End Page : 33 - 36


     This study focused on using low-pressure plasma processing on polished whiterice and unpolished riceberrybrown rice. Plasma treatment reduced the water contact angle on riceberry rice from 120.6°±1.0° to 89.8°±1.5°. Scanning electron microscope (SEM) images showed morphology of an external surface and a cross sectional view of the interior just below the surface of a rice kernel. The SEM image revealed a µm thin layer, 10-µm square-like pockets, and an endosperm of a few-mm across. The underlying pockets contain a lot of starch granules. SEM images also showed many pores on the top surface opening down to the pocket-like structure underneath after low-pressure plasma treatment. This effect caused the rice kernel to be more hydrophilic and agreed well with lower water contact angle. This work has demonstrated the feasibility of applying low-pressure plasma to improve the cooking quality of rice.

Copyrights © 2016 Microscopy and Microanalysis Research-The Journal of the Microscopy Society of Thailand , All rights reserved