000			03742nas|a2200409 i 4500
005			20260818094957.0
008			080499s1998 th uzm rtt 00| a1eng d
035			_a.b11747018
099		9	_aAIT Thesis no. AE-98-12
100	0		_aPham Van Tan
245	1	0	_aEffect of initial conditions of raw paddy on the quality of parboiled rice
260			_aBangkok : _bAsian Institute of Technology, _c1998
300			_a83 leaves
490	1		_aThesis ; _vno. AE-98-12
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1998
520			_aThe quality of raw rice may be adversely affected by weather and environment conditions before, during and after harvesting. Parboiling is known as a means of improving the quality of raw paddy which has been subjected to poor handling. In this study, the effect of initial conditions of raw paddy on the quality of parboiled rice was investigated from two Indica varieties, namely Chinat and RD-23. The initial conditions of paddy were altered, (1) by successive moisture content rewetting the paddy by spraying water at 3 different moisture content levels (16%, 20% and 24% wb) followed by drying, (2) by overdrying the paddy to 12%, 10% and 8% wb, and (3) by rewetting the paddy from 13.5% to 20% wb and then delaying drying by 0, 2, 4 and 6 days. The changes in quality of parboiled rice for all paddy samples were determined and compared with that of the control in all cases. Results showed that repeated rewetting of raw paddy led to reduced yields of both milled and head rice both from the control and parboiled paddy. The influence of overdrying on the head yield reduction of parboiled rice was very small. Whiteness of the milled non parboiled rice reduced successively with number and degree of rewetting. Conversely, the hardness increased with these for milled parboiled rice. Hardness of cooked non-parboiled rice was not affected significantly by initial conditions of the raw paddy. However, hardness of cooked parboiled rice reduced with degree of overdrying and repeated rewetting treatments. The delay in drying of rewetted raw paddy did not seem to influence milled yield, head yield and hardness of both non-parboiled rice and parboiled rice. However, the whiteness increased with delaying time for non-parboiled rice, and did not change significantly for parboiled rice.
650		0	_aRice, Parboiled
700	1		_aJindal, Vinod Kumar, _eChairperson
700	0		_aAthapol Noomhorm, _eExamination Committee
700	1		_aVincent, Jean-Claude, _eExamination committee
710	2		_aThe Queen Sirikit Scholarship, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AE-98-12
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B13100
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