TITLE:
Optical Sum Frequency Generation Spectroscopy of Cracked Non-Glutinous Rice (Oryza sativa L.) Kernels
AUTHORS:
Wataru Kouyama, Takahiro Nishida, Khuat Thi Thu Hien, Goro Mizutani, Hiroshi Hasegawa, Hiroaki Miyamura
KEYWORDS:
Rice Kernels, Cracking in Hot Weather, Optical Sum Frequency Generation (SFG), Amylopectin, Non-Glutinous Rice
JOURNAL NAME:
Journal of Biomaterials and Nanobiotechnology,
Vol.7 No.1,
January
6,
2016
ABSTRACT: In order to study the correlation between the cracking of rice
(Oryza sativa L.) kernels and the molecular structure of the
amylopectin in them, we attempted optical sum frequency generation (SFG)
spectroscopy in the C-H stretching vibration region for normal and cracked
japonica non-glutinous rice kernels. The samples were Koshihikari and
Nipponbare. In Nipponbare, the width of the SFG spectrum peak at 2915
cm- 1 of the cracked rice kernels was broader than that of
the normal ones, while for Koshihikari there was no clear difference. The width
of the 2915 cm- 1 peak is suggested to originate from the
variety of the higher-order structure of the saccharide chains in amylopectin.
Although this is a tentative result, this method is shown to have a potential of
serving for preventing the cracking of the rice kernels.