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Microwave drying kinetics and quality characteristics of corn

International Journal of Agricultural and Biological Engineering 2013年第1期6卷 90-99页

作者： Songül Gürsoy ruplal choudhary Dennis G.Watson Department of Agricultural Machinery Faculty of AgricultureDicle University21280DiyarbakirTurkey Department of Plant Soil and Agricultural SystemsMC 4415Southern Illinois UniversityCarbondaleIL 62901 USA

In recent years,microwave(MW)drying has gained popularity as an alternative drying method for a wide variety of food and agricultural products because of increasing concerns over product quality and production ***,the determination of drying kinetics that accurately describes microwave drying characteristics is crucial for the optimization of operating parameters,performance improvement of the drying system and product *** objective of this study was to investigate the drying kinetics and the quality characteristics of corn kernels,especially the effects of different initial moisture contents(18.3%,26.3%,34.3%and 42.3%db),MW power levels(70,175 and 245 W)and exposure time(80 s and 120 s)on the drying kinetics,drying rate and various key quality *** results indicated that the increased drying rate at higher power levels(P3,245 W)reduced the drying time considerably but increased stress crack index and reduced *** addition,it reduced bulk density,true density and thousand grain weight(TGW).The germination rate of corn was the highest at MW power level P1(70 W),with the lowest drying rate and observed to decrease with increase in initial moisture *** reduction in exposure time decreased stress crack index and increased germination rate,bulk density and true *** correlation analysis among drying rate,germination,stress-crack index(SCI),bulk density,true density and TGW showed that increasing drying rate could lead to an increase in SCI and decrease in germination,bulk density and true density.

关键词： microwave drying corn stress-crack germination bulk density true density

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Modelling of microwave assisted hot-air drying and microstructural study of oilseeds

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International Journal of Agricultural and Biological Engineering 2016年第6期9卷 167-177页

作者： Mohamed Hemis ruplal choudhary Nathalie Becerra-Mora Punit Kohli Vijaya Raghavan University Djillali Bounaama Khemis Miliana Road of Theniat ElhadKhemis MilianaAin Defla 44225Algeria Department of Plant Soil and Agricultural SystemsSouthern Illinois UniversityCarbondaleIL 62901USA Department of Chemistry and Biochemistry Southern Illinois UniversityCarbondaleIL 62901USA Bioresource Engineering McGill UniversitySte.Anne de BellevueQC H9X 3V9Canada

A modelling study was performed to solve the heat and mass transfer problems between grain and the ambient air encountered during drying by microwave assisted hot-air dryer,under low microwave(MW)density of 0.2 W/***(Brassica napus),soybean(Glycine max)and corn(Zea mays)seeds were chosen due to their inherent high oil *** electron microscopy(SEM)was used to study the effect of drying conditions on the structural characteristics of these oilseeds.A mathematical model was adapted to simulate drying of one seed of canola,soybean and *** process of water transfer was modelled based on the effect of vapour pressure on the water molecules inside the *** was observed that when the difference between the vapour pressure inside the grain and the surrounding air was higher than,the drying rate increased which led to cracks in the *** showed that the drying rate decreased when the temperature of air inside the cavity of the microwave increased for all the oilseeds studied,because of the reduced differential vapour pressure between the grain and the ambient *** the other hand,the drying rate increased if the temperature of the inlet air was reduced because the difference between the two pressures *** was concluded that by controlling the ambient air,the grains could be protected against popping and cracking because of lower vapour pressure differential during MW assisted hot-air drying.

关键词： mathematical modelling oilseeds MW assisted drying drying rate SEM images

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Aqua-ammonia pretreatment of corn stover for enhancing enzymatic saccharification

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International Journal of Agricultural and Biological Engineering 2012年第1期5卷 56-61页

作者： ruplal choudhary Arosha L.Umagiliyage John Haddock Plant Soil and Agricultural SystemsSouthern Illinois UniversityCarbondaleIL 62901USA Microbiology Life ScienceSouthern Illinois UniversityCarbondaleIL 62901USA

Aqua-ammonia pretreatment of corn stover was provided in a 1.2 L high pressure reactor with two ammonia:biomass ratios of 1:1(w/w)and 2:1(w/w);at three temperatures:60℃,90℃and 120℃,and two treatment time:5 min and 30 *** with water was used as *** pretreated samples were saccharified to fermentable sugars by commercial enzymes ACCELERASE 1500(cellulase)and ACCELERASE XC(xylanases).For ammonia:biomass ratio of 1:1,the yield of total fermentable sugar was 87%at 90℃for 30 min *** case of ammonia:biomass ratio of 2:1,fermentable sugar yield increased four fold of that of *** fermentable sugar yield of 99%was obtained for 2:1 ammonia:biomass ratio,90℃,and 30 min treatment *** results of this study are very promising for improving fermentable sugar yield from corn stover using smaller amount of ammonia than the ammonia fiber explosion and other pretreatments such as strong acid or alkali ***,further optimization is required for reducing pretreatment time.

关键词： aqua-ammonia pretreatment corn stover fermentable sugar enzymatic saccharification biomass

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氨水预处理玉米秸秆以增强酶的糖化作用

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农业工程技术(新能源产业) 2012年第8期 53-53页

作者： ruplal choudhary Arosha L.Umagiliyage John Haddock 吴卓晶王应宽南伊利诺伊大学植物、土壤和农业系统系南伊利诺伊大学微生物学与生命科学系

玉米秸秆的氨水预处理在1.2L的高压反应器中进行。反应采用2个氨与生物质(玉米秸秆)的比例(质量比),分别为1:1和2:1;3个反应温度,分别为60℃,90℃和120℃;2个处理时间,分别为5分钟和30分钟。以水的预处理作为对照。用商用酶纤维素酶ACCE... 详细信息

玉米秸秆的氨水预处理在1.2L的高压反应器中进行。反应采用2个氨与生物质(玉米秸秆)的比例(质量比),分别为1:1和2:1;3个反应温度,分别为60℃,90℃和120℃;2个处理时间,分别为5分钟和30分钟。以水的预处理作为对照。用商用酶纤维素酶ACCELERASE 1500和木聚糖酶ACCELERASE XC使预处理的样品糖化成为可发酵糖。氨与生物质的质量比为1:1,90℃处理30分钟时,总的可发酵糖产量为87%。氨与生物质的质量比为2:1时,可发酵糖的产量是对照中可发酵糖分的4倍。氨与生物质的质量比2:1,90℃处理30分钟时,可发酵糖产量最多,达99%。本研究结果表明从玉米秸秆中提高可发酵糖的产量是非常有前景的。这一方法比氨法爆破和其他预处理方法如强酸强碱的预处理方法使用的氨剂量更小。然而,需要进一步优化实验以缩短预处理时间。

关键词：氨水预处理玉米秸秆可发酵糖酶的糖化生物质

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