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Introduction Fortification of staple food, such as rice, can be an excellent tool to improve the nutrition and health especially in low- and middle-income countries, where micronutrient deficiency burden is an extensive problem [ 1 ]. Rice is the

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Journal of Thermal Analysis and Calorimetry
Authors: J. Amorim, S. Eliziário, D. Gouveia, A. Simőes, J. Santos, M. Conceiçăo, A. Souza, and M. Trindade

Abstract  

The thermogravimetry (TG) is a technique used in the quality control of foods. In this work the moisture and ash contents in the rice and by-products (bran and husk), the thermal stability and the gelatinization process by conventional, thermogravimetric and calorimetric methods were studied. The moisture and ash contents obtained by TG and conventional methods did not present significant differences. The rice presented higher starch content, while the bran presented higher protein content. The thermogravimetric data presented the following thermal stability order: rice>bran>husk. The calorimetric curves indicated the gelatinization of the starch. The kinetic parameters were compatible.

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Journal of Thermal Analysis and Calorimetry
Authors: Xue-Gang Chen, Shuang-Shuang Lv, Ping-Ping Zhang, Lu Zhang, and Ying Ye

Introduction Rice, sharing equal importance with wheat, is one of the major crops grown throughout the world. Rice is the principal staple food and nourishment for the world’s population. Rice hull, or rice husk, is the milling

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Thermal degradation of rice husks on a pilot plant

Utilization of the products as adsorbents for oil spill cleanup

Journal of Thermal Analysis and Calorimetry
Authors: S. Genieva, S. Turmanova, A. Dimitrov, P. Petkov, and L. Vlaev

Introduction Rice husks are an important by-product of rice milling process and are major waste product of the agricultural industry. According to the statistical data of Food and Agriculture Organization (FAO), the world

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, C. , Afonso Junior , P.C. , Arana , I. ( 2007 ) Physical and mechanical properties in rice processing . Journal of Food Engineering . 79 : 137 – 142 . ElMasry , G

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. A. S. Institute Inc., SAS/STAT User’s Guide, SAS Institute Inc., Cary, NC, 2003 [20] PATH, Ultra Rice Technology, http://www.path.org/files/UltraRiceBrochure2000-web.pdf, 2011 [21

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Abstract  

Various rice species, marketed in Austria, were analyzed for their Se, Cr, Ni, Rb, Fe, Co, Cs, Ag and Hg contents by neutron activation analysis. The concentration values found for Se ranged between 0.023 and 0.265 ppm, for Cr 0.540–1.875 ppm, for Ni 0.359–0.965 ppm, for Rb 1.604–6.400 ppm, for Fe 24.3–139.8 ppm, for Co 0.026–0.055 ppm, for Cs 0.016–0.032 ppm, for Ag 0.0006–0.0034 ppm, for Hg 0.003–0.023 ppm. Statistical analysis showed in the majority of cases that there is a significant difference in Se, Cr, Ni, Rb, Fe, Co, Hg contents but not in Cs. Highest values of Se and Fe were found in rice from Belgium /long seed, super patna/, whereas the Cr concentration was the highest in rice from Thailand /siam patna/. Ni was highest in rice from Uncle Ben's, Rb in Kresto from USA.

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Abstract  

Rice plants were grown in an experimental field and separated at harvest into different components, including polished rice, rice bran, hull, straw and root. The distribution of chlorine in these components was determined by instrumental neutron activation analysis. The concentration of chlorine in the roots was the highest (4800 mg·kg−1 dry wt.) and that in the polished rice was the lowest (140 mg·kg−1 dry wt.) among the plant components. The content of chlorine in the polished rice was about 2% of the entire plant, and the rest was present in the inedible portions; about 75% of the total chlorine content was in the straw. The percentage of chlorine removed from the surface soil layer to the above ground biomass of the rice plants was calculated as 5% every year. The chlorine concentrations in leaf blades of different positions collected from four growing stages varied by more than one order of magnitude, and were well correlated with the sum concentrations of major cations (potassium + calcium + magnesium). This may be attributed to the fact that the translocation rate of chlorine among the leaf blades with age depends on the concentrations of the major cations.

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Abstract  

Five varieties of rice have been analyzed to study the prevailing concentration and distribution of 10 trace elements in rice and rice husk. NAA in combination with AAS has been utilized for the determination of Hg, Pb, Cd, As, Br, Sb, Se, Ni, Al and Cs. The elemental ratios of rice to husk and within rice have been calculated to get information regarding their uptake channels. The daily supply of the elements to the human body has been estimated and from these the safety of the diet has been assessed by comparing with the suggested tolerance levels. A global distribution pattern of some of these elements in rice has also been evaluated.

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Abstract  

An instrumental neutron activation analysis technique has been utilized to study the prevailing levels of certain inorganic trace elements in different varieties of rice produced in Pakistan. The data have been compared with those of other countries. The elemental ratios within rice and rice to husk have been computed to evaluate indirectly the impact of soil and environment on the rice crops. The dietary spectum for the inhabitants of Rawalpindi/Islamabad areas has been evaluated by estimating the daily intake and comparing with allowances suggested in the literature.

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