The objective of this study was to determine predictive models of rice functionality from protein and starch chemistry data. One long-grain rice variety (Cocodrie) was harvested from two fields in Arkansas. Rice was harvested from 8 locations in each field. Samples were then stored at 21oC/50% RH until equilibrated to a storage moisture content of 12%. Texture properties were measured using a T...

A protocol was developed to measure the glass transition temperature (Tg) of brown rice kernels using dynamic mechanical thermal analysis (DMTA). In order to accommodate the sample requirements of the dynamic mechanical thermal analyzer and prevent moisture loss during experiments, kernels were first wrapped with a thin layer of parafilm and then a thin layer of aluminum foil. The wrapped kerne...

The major seed storage proteins (SSPs) in rice seeds have been classified into three types, glutelins, prolamins, and globulin, and the proportion of each SSP varies. It has been shown in rice mutants that when either glutelins or prolamins are defective, the expression of another type of SSP is promoted to counterbalance the deficit. However, we observed reduced abundances of glutelins and pro...

A new locus responsible for increased yield potential across the genetic background in rice (Oryza sativa L.) was identified and evaluated. Quantitative trait loci (QTLs) were analysed for the ratio of filled grains, a yield component, in backcrossed inbred lines of a japonica 'Nipponbare'xindica 'Kasalath' cross for 3 years. Only one QTL (rg5), with a positive Kasalath allele, was detected acr...

Wild progenitors of rice (Oryza) are an invaluable resource for restoring genetic diversity and incorporating useful traits back into cultivars. Studies were conducted to characterize the biochemical changes, including SDS-PAGE banding pattern of storage proteins in seeds of six wild species (Oryza alta, O. grandiglumis, O. meridionalis, O. nivara, O. officinalis and O. rhizomatis) of rice stor...

Rice bran lipase, phospholipase and galactolipase were extracted, purified and thenn characterized as the enzyme mixtures. All the enzymes were eluted on Sephadex G-100, column as one peak, showing that they have a similar molecular weight around 40,000. On DEAE-Sephadex A-50 column, these enzymes were further separated into two to four components, respectively. Chemical modification suggests t...

Indica rice starch and japonica rice starch were used in the study. The protein contents of the two rice variety were respectively 0.43%, 0.62%, 0.84%, 1.08%, 1.25%. The pasting and rheological properties of samples were determined with Rapid Visco Analyzer and dynamic rheometer. The results indicated that, with the increase of protein content, the peak viscosity, breakdown viscosity and final ...

After rice and wheat, Potato (Solanum tuberosum L.) is the third most important food crop worldwide and provides high quality nutrition, especially food energy, vitamin C, potassium, protein and dietary fiber [1,2]. Due to their short production cycle, potatoes provide food faster than cereals or legumes and produce more food calories per hectare, and use less water as compared to either wheat ...

Martin, Daniel Thomas M.S., Purdue University, May 2014. Wheat Stored in Triple Layer Plastic Bags: Protection Against the Rice Weevil, Sitophilus oryzae L. (Coleoptera: Curcilionidae) and the Effect of Air Leaks on Hermetic Storage. Major Professor: Dr. Larry L. Murdock. The Purdue Improved Crop Storage system is a triple layer high-density polyethylene storage technology that has proven to be...