Untersuchungen uber den durch die Feuchtigkeitszunahme verursachten Querriss (Doware) des Reiskornes.

Kondō, Mantarō; Okamura, Tamotsu

doi:10.1626/jcs.2.73

Cited by 2 publications

(6 citation statements)

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“…The observation that low moisture rice kernels fissure from rapid moisture adsorption was reported more than a half century ago by Kondo and Okamura (1930) and Stahel (1935). Their results have been confirmed by Kik (1951), Hall (1965, 1967), Kunze (J977), Kunze and Prasad (1978), Chen and Kunze (1983) and Siebenmorgen and lindal (1986).…”

Section: Introductionmentioning

confidence: 89%

Head Rice Yield Reduction Rates Caused by Moisture Adsorption

Banaszek¹,

Siebenmorgen²

1990

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An empirical rate equation was developed to predict head rice yield reduction for rough rice exposed to moisture adsorptive conditions. Time of exposure, initial moisture content, and relative humidity were significant to the reductions in head rice yield caused by moisture adsorption. An equation used to predict the number of kernels which fissured upon exposure to various environments was modified and evaluated for use in describing head rice yield reductions. A decrease in head rice yield of greater than 20 percentage points was found in the lowest initial moisture content rice samples (9% wet basis) subjected to the highest relative humidity of 90%. Lower reductions in head rice yield were found in the higher initial moisture content samples and at the lower relative humidity of 70%. Most of the damage to the kernels occurred within the first 24 hours of exposure to the humid air. *Unless otherwise specified, all references to moisture content are on a wet basis. ,Mention of a commercial name does not imply endorsement by the University of Arkansas.

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Section: Introductionmentioning

confidence: 89%

Head Rice Yield Reduction Rates Caused by Moisture Adsorption

Banaszek¹,

Siebenmorgen²

1990

Transactions of the ASAE

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“…The difference in test weights was a definite indication that a change had occurred in the weathered grain, but the nature of the change could not be clearly described or defined. Kik (1951) conducted nutritive studies of rice and reconfirmed the findings of Kondo and Okamura (1930) and that of Stahel (1935). He observed cracks in nonstained kernels by placing them on the stage of a stereoscopic microscope and shining a light through them.…”

Section: Sequences?mentioning

confidence: 69%

“…Stresses that develop within the grain are undoubtedly three-dimensional but the principal stresses appear to be parallel to the long axis of the grain. Kondo and Okamura (1930) initially reported that moisture readsorption by the kernel after it was dried was much more responsible for fissuring of the grain than the drying process itself. When well dried rice was subjected to a high relative humidity environment, a large number of fissured grains developed very rapidly.…”

Section: Sequences?mentioning

confidence: 99%

“…They attempt t o trace in a somewhat chronologwd order the unravelling of the moisture adsorption-grain fissuring concept. The findings of Kondo and Okamura (1930) and those of Stahel (1935) received little attention because the communication of knowledge across continental barriers was limited at that time.…”

Section: Sequences?mentioning

confidence: 99%

“…Other researchers (Kondo and Okamura 1930;Stahel 1935; Kunze and H a l l 1965) indicate that rice with more than 15 or 16% moisture (wb) will not fissure when exposed to a moisture adsorbing environment. Different rice varieties grown under different climates and levels of fertilization may have different moisture thresholds at which fissuring commences.…”

Section: Reharvest Moisture Readsorptionmentioning

confidence: 99%

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Moisture Adsorption Influences on Rice

Kunze

1977

J Food Process Engineering

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Rice is a hygroscopic grain which adsorbs or desorbs moisture depending on its ambient environment. Moisture desorption is associated with rice drying. Much research has been conducted to determine those drying procedures which produce the highest head rice yield. Moisture adsorption is associated with water reentering the rice grain. This occurs when the vapor pressure within the grain is lower than the vapor pressure in the surrounding air. Rapid moisture readsorption causes the rice grain to fissure. Fissured grains usually break during subsequent hulling and milling operations. This paper reviews the literature related to moisture adsorption and fissuring of the rice grain, and discusses those preharvest and postharvest conditions where rice grains are subjected to moisture‐adsorbing environments which have the potential to fissure the grain and subsequently reduce head rice yield.

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Untersuchungen uber den durch die Feuchtigkeitszunahme verursachten Querriss (Doware) des Reiskornes.

Cited by 2 publications

References 0 publications

Head Rice Yield Reduction Rates Caused by Moisture Adsorption

Head Rice Yield Reduction Rates Caused by Moisture Adsorption

Moisture Adsorption Influences on Rice

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