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Impacts of Postharvest Temperature E...

Graham-Acquaah, Seth.

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Impacts of Postharvest Temperature Exposure Profiles on Rice Physicochemical Properties.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Impacts of Postharvest Temperature Exposure Profiles on Rice Physicochemical Properties./
Author:	Graham-Acquaah, Seth.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	101 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-07, Section: B.
Contained By:	Dissertations Abstracts International82-07B.
Subject:	Food science. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28260591
ISBN:	9798557034326

Impacts of Postharvest Temperature Exposure Profiles on Rice Physicochemical Properties.
Graham-Acquaah, Seth.

Impacts of Postharvest Temperature Exposure Profiles on Rice Physicochemical Properties. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 101 p.

Source: Dissertations Abstracts International, Volume: 82-07, Section: B.

Thesis (Ph.D.)--University of Arkansas, 2020.

This item is not available from ProQuest Dissertations & Theses.

Heated-air drying followed by tempering (HAT) is effective for increasing rough-rice drying rates without compromising head rice yield (HRY). However, heat exposure could affect rice end-use properties. Hypothesizing that the total amount of heat exposure incurred by rice during heated-air drying determines the trend and magnitude of changes in end-use properties, this dissertation sought to 1) characterize the effects of drying and tempering regimen on changes in end-use properties, 2) derive an index to quantify and compare the amount of heat exposure that rice kernels incur during active drying and, 3) relate values of this index to changes in rice end-use properties. A series of drying experiments were conducted on a long-grain rice cultivar. Paste viscosities and texture of rice gels prepared from flour obtained from dried (12.5% MC) rice samples were evaluated. A theoretical framework was developed and employed alongside time-temperature data collected from drying experiments to derive an index for quantifying thermal exposure, Graham-Acquaah's Thermal Exposure (GATE) value, during drying. Paste viscosities and gel texture were not only dependent on drying air temperature but also on how long the rice was exposed to a given temperature during drying and tempering. Air relative humidity (rh) had an indirect effect on end-use properties. Using different HAT regimens, peak viscosity was altered by 16%, breakdown by 24%, and setback by >500% compared to control samples. Gel strength was increased by approximately 40% with HAT regimens. The GATE values had strong and significant (p<0.05) correlations (0.82 - 0.93) with end-use properties. Practical changes (≥10% change) in end-use properties occurred when GATE values were ≥ 40 min. The results suggest that HAT regimens must be carefully selected, not only to minimize HRY reductions but also minimize variations in the functional properties of rice for end-use applications. The proposed GATE values would be useful for predicting changes in rice properties during heated-air drying.

ISBN: 9798557034326Subjects--Topical Terms:

3173303
Food science.
Subjects--Index Terms:

Drying

Impacts of Postharvest Temperature Exposure Profiles on Rice Physicochemical Properties.
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500 $a Advisor: Siebenmorgen, Terry J.
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520 $a Heated-air drying followed by tempering (HAT) is effective for increasing rough-rice drying rates without compromising head rice yield (HRY). However, heat exposure could affect rice end-use properties. Hypothesizing that the total amount of heat exposure incurred by rice during heated-air drying determines the trend and magnitude of changes in end-use properties, this dissertation sought to 1) characterize the effects of drying and tempering regimen on changes in end-use properties, 2) derive an index to quantify and compare the amount of heat exposure that rice kernels incur during active drying and, 3) relate values of this index to changes in rice end-use properties. A series of drying experiments were conducted on a long-grain rice cultivar. Paste viscosities and texture of rice gels prepared from flour obtained from dried (12.5% MC) rice samples were evaluated. A theoretical framework was developed and employed alongside time-temperature data collected from drying experiments to derive an index for quantifying thermal exposure, Graham-Acquaah's Thermal Exposure (GATE) value, during drying. Paste viscosities and gel texture were not only dependent on drying air temperature but also on how long the rice was exposed to a given temperature during drying and tempering. Air relative humidity (rh) had an indirect effect on end-use properties. Using different HAT regimens, peak viscosity was altered by 16%, breakdown by 24%, and setback by >500% compared to control samples. Gel strength was increased by approximately 40% with HAT regimens. The GATE values had strong and significant (p<0.05) correlations (0.82 - 0.93) with end-use properties. Practical changes (≥10% change) in end-use properties occurred when GATE values were ≥ 40 min. The results suggest that HAT regimens must be carefully selected, not only to minimize HRY reductions but also minimize variations in the functional properties of rice for end-use applications. The proposed GATE values would be useful for predicting changes in rice properties during heated-air drying.
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