I have been investigating the morphology of rice by using SEM and I found interesting results and would like more information about it.
I haven't seen any specifically for rice storage, but the following citations for maize
Kells, S.A., L.J. Mason, D.E. Maier, and C.P. Woloshuk. 2001. Efficacy and fumigation characteristics of ozone in stored maize. J. Stored Products Res. 37 (2001) 371-382.
A. de M. Pereira, L.R. D’A. Faroni, A.H. de Sousa, J.L.P. Marco, M.T.C. da Silva. Evaluation of oil extractedf from corn grains ozonized at different levels of grain mass temperature. Fumigation and Control Atmosphere. PS6-14-6331.
Dear mr Christopher Butts,
Thank you so much for your answers and suggestions. I try to find your proposed articles.
The only publication I have seen on ozonation of rice grain is:
Mendez et al., 2003. Penetration of ozone into columns of stored grain and its effect on chemical composition and processing performance. J Stored Product Research 39: 33-44.
The bran of rice has a significant lipid content as compared to other cereals. Ozone can oxidize these compounds which will change the color and odor of unmilled rice. However, it is doubtful that this will impact to quality of milled products.
If you have a specific question on ozone treatment of grain, please let me know.
Thank you Dr. Murphy, I used Mendez et al, 2003 as reference. Have you experience on hardness, transparency, whiteness of grain after ozone treatment?
Dr. Nur,
I have never measured hardness, transparency or whiteness on any grain that we have treated. I would suspect that ozone would not impact hardness but may affect transparency and hardness at high ozone conc. and long exposure times. Ozone does "bleach out" the endosperm of broken corn kernels.
Dr. Murphy
Yes, you are right, I found that ozone would not impact hardness, but small change of transparency at high ozone conc. and long exposure times (240 minutes)
What type(s) of grain have you treated with ozone? Paddy rice? What is your high ozone concentration?
Dear Dr. Murphy
I have treated papdy rice with ozone concentration 9 ppm for time of treatment from 30 minutes to 240 minutes, The interval of time treatment was 30 minutes.
Dr. Nur,
Thank you for your response. Is increasing or decreasing the whiteness or transparency of rice desirable? I assume reducing the hardness of rice is desirable. Do you think that whiteness and transparency may be significantly improved if you had the capabilities to treat with ozone at up to 30,000 ppm?
Dr. Murphy
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