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Title: EFFECTS OF GAMMA IRRADIATION ON ASPECTS OF MILLED RICE (ORYZA SATIVA) END-USE QUALITY

Author
item JINSONG, BAO - INST. OF NUCLEAR AGRIC SC
item QINGYAO, SHU - INST. OF NUCLEAR AGRIC SC
item YINGWU, XIA - INST. OF NUCLEAR AGRIC SC
item Bergman, Christine
item McClung, Anna

Submitted to: Journal of Food Quality
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/15/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary: Conventional breeding efforts to create rice that is known as Indica-type with textural and functional properties similar to that categorized as Japonica-type have not been completely successful. An alternative strategy is to develop a processing method to modify the end-use quality of Indica- type rice. Gamma irradiation of indica-type rice improved aspects of its end-use quality and broadened its functionality for industrial uses. Above the range of exposure that is known to useful for destroying insects and spoilage microorganisms, negative effects on rice color and aroma were found.

Technical Abstract: Conventional breeding efforts to create Indica-type rice cultivars with textural and functional properties similar to Japonica-type rice have not been considered successful by some consumers. An alternative strategy is to develop a processing method to modify the end-use quality of Indica-type rice. Milled rice samples with low, intermediate and high apparent amylose econtent (AAC) were treated with 60Co gamma rays. AAC was impacted only by high doses of gamma rays while gel consistency was significantly increased. Increasing levels of gamma irradiation (GIR) reduced rice flour viscosity and increased the temperature of gelatinization onset. Exposure to gamma rays caused the RVA setback but not the instrumental texture properties of an Indica-type cultivar to became more like that of the Japonica-type rice. GIR of milled rice for human consumption would be limited to between 2 and 4 kGy because of its negative effects at higher doses on rice color and aroma. However, that level will destroy insects and some microorganism an change rice of unacceptable quality for some consumers closer to being acceptable and may also broadened the functionality of rice for industrial uses. Conventional breeding efforts to create rice that is known as Indica-type with textural and functional properties similar to that categorized as Japonica-type have not been completely successful. An alternative strategy is to develop a processing method to modify the end-use quality of Indica- type rice. Gamma irradiation of indica-type rice improved aspects of its end-use quality and broadened its functionality for industrial uses. Above