• 제목/요약/키워드: rice-hull

검색결과 290건 처리시간 0.029초

Effect of Hydrothermal Treatment on the Antioxidant Activity of Rice Hull Extracts

  • Park, Sun-Min;Lee, Seung-Cheol
    • Food Science and Biotechnology
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    • 제18권6호
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    • pp.1435-1438
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    • 2009
  • Hydrothermal treatment of rice hull was hydrothermal carried out at 105, 110, $121^{\circ}C$ for 15, 30, 60 min, respectively, using a conventional autoclave. Antioxidant activity of the hydrothermal treated rice hull extract was evaluated by determining total phenol contents (TPC), 1,1-diphenyl-2-picylhydrazyl (DPPH) radical scavenging activity (RSA), reducing power, and ABTS RSA. TPC, DPPH RSA, reducing power, and 2,2-azinobis(3-ethylenebenzothiozoline-6-sulfonic acid) (ABTS) RSA of the extract were significantly increased with increasing treated temperature and time. For example, hydrothermal extracts at $121^{\circ}C$ for 60 min increased the TPC, DPPH RSA, reducing power, and ABTS RSA to 0.840 mg/mL, 64.77%, 1.437, and 92.11%, respectively, while those of the extracts treated at $105^{\circ}C$ for 60 min were 0.508 mg/mL, 51.23%, 0.819, and 45.22%, respectively. The results indicated that hydrothermal treatment of rice hull was very effective to increase phenolic compounds and antioxidant activity of rice hull extract.

Microwave처리에 의한 쌀 가공 부산물의 항산화능의 변화 (Effect of Microwave Treatment on the Antioxidant Activity of Rice Processed By-products)

  • 배성문;김정한;조철우;정태춘;하정욱;이승철
    • 한국식품영양과학회지
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    • 제30권6호
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    • pp.1026-1032
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    • 2001
  • Microwave 처리가 쌀가공 부산물로 발생하는 왕겨와 미 의 항산화능에 미치는 영향을 조사하였다. 100 W, 200 W, 440 W의 출력으로 microwave를 처리하였을 때, 출력과 처리시간에 비례하여 갈변을 나타내는 색도의 변화가 관찰되었다 그러나, 왕겨와 미강의 전자공여능은 조사된 범위 내에서 microwave처리에 대해 큰 변화를 보이지 않았다. 활성산 소종($H_2O$$_2$,O$_2$$^{-}$, .OH)을 발생시켜 어유의 과산화에 대한 왕겨와 미강의 과산화 억제력을 조사한 결과, 전반적으로 왕겨가 미강보다 microwaye 처리에 안정함을 보였다 특히, $H_2O$$_2$에 대한 왕겨의 과산화 억제력은 미강에 비하여 매우 높게 측정되었다. 이상의 결과로 왕겨가 미강보다 항산화 물질을 많이 함유함으로써 미강보다 높고 안정한 항산화능을 나타내 고, 또한 microwave 처리로 인하여 항산화 물질이 일부 파괴되지만 항산화력을 가지는 갈변 반응 생성물이 생성되어 왕겨의 경우에는 microwave 처리에 대해 영향을 거의 받지 않 음을 알 수 있었다. 따라서, microwave 처리 공정은 왕겨나 미강의 항산화능을 이용한 가공 방법에 이용될 수 있음을 의미한다.

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왕겨보드 제조를 위한 적정 전처리 조건에 관한 연구 (Study on the Optimum Pre-treatment Condition for Manufacture of Rice Hull Board)

  • 이화형;한기선
    • Journal of the Korean Wood Science and Technology
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    • 제28권3호
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    • pp.9-13
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    • 2000
  • 본 연구는 해마다 100만 톤 이상이 생산되는 국내산 왕겨를 이용하여 왕겨보드를 제조함에 있어, 무처리 왕겨로 제조한 왕겨보드의 기계적 성질의 단점을 보완하기 위하여 왕겨를 전처리함으로써 그 물리 기계적 성질을 개선하기 위해 실시되었다. 연구결과를 요약하면, 무처리, 증자처리 및 가성소다로 알칼리처리한 왕겨보드보다 폭쇄처리한 왕겨보드가 휨강도 및 박리강도가 더 높았으며, 이때 적정 폭쇄처리 조건은 압력 20kgf/$cm^2$, 시간 1분과 압력 25kgf/$cm^2$, 1분이었다. 무처리 왕겨보드의 경우 휨강도, 박리강도 모두 KS를 만족시키지 못한 반면, 폭쇄처리 왕겨 보드의 경우 KS PB 18.0형의 기준을 모두 만족시켰으며, PB 대조구와 비교할 때 동등한 강도를 보였다. 기타 왕겨 전처리의 경우에 있어서도 가성소다처리보다는 증자처리가 왕겨보드의 강도를 향상시키는 것으로 나타났다.

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Physical Properties of Rice Hull and Straw for the Handling Facilities

  • Oh, Jae H.;Kim, Myoung H.;Park, Seung J.
    • 한국농업기계학회:학술대회논문집
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    • 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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    • pp.283-292
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    • 1996
  • This study was performed to determine the physical properties of rice hull and straw which could be used for an optimum design and operation of the handling facilities for these rice crop by-products. The properties measured were kinetic friction coefficient , bulk density, and dynamic and static angle of repose. Rice hulls with moisture content of 13% and 21% were used throughout the test while rice straws of 10% and 16% moisture were chopped into 10mm length and used for the test. Friction coefficient was calculated from the horizontal traction forces measurement when a container holding the mass of rice hull and straw was pulled over mild steel. PVC, stainless steel, and galvanized steel surface by a universal testing machine. Bulk density was measured by an apparatus consisting of filling fundel and a receiving vessel. Dynamic angle of repose which is the angle at which the material will stand when piled was calculated from the photos of bulk samples after they were flowed by gravity and accumulated on a circular surface. Static angle of repose which is the angle between the horizontal and the sloping side of the material left in the container when discharging was also measured in the similar way. Results and conclusions from this study are summarized as follows . 1. Kinetic friction coefficient of both rice hull and straw were in the range of 0.26 -0.52 and increased with the moisture content. The magnitude of friction increased in the order of galvanized steel, stainless steel, PVC ,and mild steel. 2. Bulk densities of rice hull decreased while those of rice straw increased with moisture content increase . Average bulk densities of rice hull and straw were 96.8 and 74.7kg/㎥, respectively. 3. Average dynamic angle of repose for rice straw was 32.6$^{\circ}$ and those for 13% and 21% moisture rice hull were 38.9$^{\circ}$ and 44.9$^{\circ}$ , respectively. 4. Static angles of repose for both rice hull and straw showed increase with the moisture content. The values were 75.2\ulcorner and 80.2$^{\circ}$ for 13% and 21% moisture rice hull, respectively. Rice straws having 10% and 16% moisture content showed 87.3% and 89.2$^{\circ}$ static angle of repose, respectively.

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왕겨 연소기(燃燒機)를 이용(利用)한 온수(溫水)보일러 시스템 개발(開發) (I) -실험적(實驗的) 연구(硏究)- (Development of a Hot Water Boiler System with a Rice Hull Furnace)

  • 이용국;박승제;백풍기;노상하
    • Journal of Biosystems Engineering
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    • 제12권4호
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    • pp.31-43
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    • 1987
  • This study was performed to develop a hot water boiler system with small scale automatic rice hull furnace for the multi-purpose use in the farm. For the experiment a prototype hot water boiler system with rice hull furnace was fabricated, which was equipped with automatic hull feeder, igniter and ash removal device. Optimum operational conditions of the prototype: system were analyzed. The results arc summarized as follows. 1. The temperature measured right above the burning surface should be higher than $500^{\circ}C$ combustion. 2. The top zone of the combustion chamber was the most suitable location of the thermocouple to pick up the control temperature for the automatic operation of the rice hull furnace. 3. The content of carbon monoxide in the flue gas was increased with the filling height of burning material but it was less than 0.3 percent in volume in this experiment. When the filling height was expressed as the ratio of rice hull feed rate to the volume of the combustion chamber above the burning surface, the optimum ratio was about $150kg/m^3-h$. 4. The combustion efficiency of the prototype was higher than 95 percent when the feed rate was 1.1 to 2.3 kg/h and moisture content of rice hull was 22.4 percent (w.b.) or less. 5. It was estimated that the optimum operational conditions of the system were 1.3 to 2.0 kg/h in feed rate, 70 to 100 percent in excess air and 500 to $510^{\circ}C$ in control temperature. 6. The efficiency of coil heal exchanger increased with a decrease in feed rate of rice hull. When the rice hull feed rates were 1.1, 1.7 and 2.3 kg/h, the efficiencies of coil heat exchanger were about 34, 30 and 25 percent and heat transfer rates were 5.7, 7.6 and 8.8 MJ/h, respectively. When the flat plate heat exchanger was used in addition to the coil heat exchanger, the efficiency of the heat exchanger system increased to 48 percent.

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Sound Absorption Coefficient and Sound Transmission Loss of Rice Hull Mat

  • Kang, Chun-Won;Lee, Nam-Ho;Jang, Sang-Sik;Kang, Ho-Yang
    • Journal of the Korean Wood Science and Technology
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    • 제47권3호
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    • pp.290-298
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    • 2019
  • The sound absorption coefficient and transmission loss of several types of rice hull mats with varying apparent densities and thicknesses are estimated in this paper using the transfer function and matrix methods, respectively, to evaluate the possibility of using rice hull as an acoustic construction material. The mean sound absorption rates of 10-cm-thick rice hull mats with target densities of $0.10g/cm^3$, $0.12g/cm^3$, and $0.14g/cm^3$ were 0.91, 0.92, and 0.95, respectively, while those of the 1-cm-thick plywood attached to the back of the rice hulls were 0.90, 0.92, and 0.92, respectively. The means of the sound transmission loss of the 10 cm-thick rice hull mats with the target densities of $0.10g/cm^3$, $0.12g/cm^3$, and $0.14g/cm^3$ were 7.66 dB, 10.49 dB, and 14.14 dB, respectively, while those of the 1 cm-thick plywood attached to the back of the rice hulls were 33.34 dB, 36.72 dB, and 38.95 dB, respectively. In conclusion, a rice hull mat could be used as acoustic construction materials because of its high sound absorption coefficient and sound transmission loss.

폐섬유자원의 발효공학적 이용에 관한 연구 (제3보) 볏짚, 왕겨및 전분박 당화액을 이용한 효모배양 (Studies on the Fermentative Utilization of Cellulosic Wastes (part III) Production of Yeast from the Hydrolyzate of Rice straw, Rice hull and Corn Starch Pulp.)

  • 성낙계;심기환;이천수
    • 한국미생물·생명공학회지
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    • 제4권4호
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    • pp.152-158
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    • 1976
  • 전분박을 첨가한 왕겨및 볏짚의 산당화액을 이용하여 효모생육조건을 검토하여 다음과 같은 결론을 얻었다. 1. 왕겨와 볏짚에 전분박을 첨가하여 당화시킴으로써 당화액의 당농도가 각각 9.12%, 7.98%까지 증가되었다. 2. 산당화액을 중화할 때 사용한 중화제로서는 CaCO$_3$, Ca(OH)$_2$, NH$_4$OH순으로 효모생육이 좋았다. 3. 당화액을 기질로 하여 무기영양요구성을 검토한 결과 (NH$_4$)$_2$SO$_4$0.3%, $K_2$HPO$_4$0.4%, MgSO$_4$ㆍ7$H_2O$0.02%, NaCl 0.02%, CaCl$_2$0.02%를 가하였을 때 효모의 생육도가 가장 좋았다. 4. 전분박을 첨가한 왕겨와 볏짚의 당화액을 기질로 하여 효모를 배양하였을 때 48시간 이내에 각각 91.2% 90.8%의 당을 소화하였고 당에 대한 수율은 각각 46.5 %, 45.4%이었다.

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Effects of carbonized rice hull and wood vinegar on the improvement of cultivation condition and grain quality of rice

  • Cho, Sun-Sik;Heo, Kyu-Hong;Seo, Pil-Dae;Rico, Cyren;Bequillo, Irvin;Kang, Mi-Young;Lee, Sang-Chul
    • 한국유기농업학회:학술대회논문집
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    • 한국유기농학회 2009년도 하반기 학술대회
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    • pp.317-317
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    • 2009
  • The effects of environment-friendly materials carbonized rice hull and wood vinegar on the improvement of rice quality and soil fertility were investigated. Combined application of carbonized rice hull and chemical fertilizer resulted in lower protein in rice, similar amylose content and generally higher palatability values. Combined application of wood vinegar and chemical fertilizer obtained high protein and amylose contents, and palatability values. However, both carbonized rice hull and wood vinegar did not exhibit weed control. In the carbonized rice hull treatments, soil K was high during heading stage while soil pH during harvest stage was low. In the case of wood vinegar treatments, clear distinction between total K and Ca was observed. K was high during tillering stage while Ca was high until harvest stage.

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톱밥, 볏짚, 왕겨 및 신문지를 이용한 돈분의 퇴비화 (Composting of Swine Feces Using Sawdust, Rice Straw Rice Hull or Newspaper as a Bulking Material)

  • 최경호;박석환;정문식
    • 한국환경보건학회지
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    • 제21권1호
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    • pp.56-67
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    • 1995
  • This study was carried out to observe how composting reaction proceed in the optimum composting condition and to understand the characteristics of final compost, when swine feces was amended with different bulking material. Sawdust, rice straw, and rice hull were selected as bulking materials and each of these was mixed with swine feces to obtain the optimum range of moisture contents and C:N ratio. To grasp the influence of newspaper on cornposting reaction when it flew into the composting site intentionally or accidentally, another composting reaction using newspaper as a bulking material was studied. In this experiment, raw material mixes containing the same amount of organic materials were put into 4 composting reactors and composted in the same environmental condition for 3 weeks from Aug. 1, 1994 to Aug. 22, 1994. The followings are the main results of this study. 1. The maximum temperatures reached at during cornposting reaction were 53.8$\circ$C, 51.9$\circ$C, 52.7$\circ$C, and 52.1$\circ$C in the reactor using sawdust, rice straw, rice hull, and newspaper as a bulking material respectively: Thermophilic temperatures were maintained for 72, 108, 108, and 111 hours in each reactor. Mean temperatures of reactors using sawdust, rice straw, rice hull, or newspaper as a bulking materials were 39.7$\circ$C, 39.5$\circ$C, 41.3$\circ$C, and 40.3$\circ$C, but no significant difference between these mean temperatures was observed(p>0.05). Each composter showed significant difference from room temperature(p<0.01), and the mean difference between them was 9.4$\circ$C. 2. Ash contents of each reactor increased rapidly in order of rice straw, rice hull, newspaper, and sawdust according to the pattern of second order function. This rate of increase seemed to result from structural characteristics of a bulking material. The absolute values of second order coefficient of these regression functions were 0.0199, 0.0159, 0.0157, and 0.0144 in each reactor using rice straw, rice hull, newspaper, or sawdust as a bulking material. 3. C:N ratio decreased as the reaction proceeded. Degree of decrease was in order of rice straw, rice hull, newspaper, and sawdust. This sequence was consistent with the increase rate of ash content. The ratios of initial C:N ratio to final C:N ratio were 0.45, 0.53, 0.64, and 0.75 in each reactor using rice straw, rice hull, newspaper, and sawdust as a bulking material respectively. From this ratios, it was possible to infer that all the composting reactions were completed. 4. Fertilizer content containing in the final compost was 1.61~2.20% of N, and 0.35~0.54% of P in dry weight base. According to the classification standard for compost constituent by Higgins, all composts had the intermediate grade of N, but below the low grade of P excepting the newspaper amended compost(fall into the range of the low grade). 5. Heavy metal contents contained in the composts were analyzed. In case of Cd, the range of 0.58~1.11 $\mu$g/g was observed, and in case of Pb, the range of 24.76~39.53 $\mu$g/g was observed(in wet weight base). These values are below the permissible heavy metal level for compost of foreign countries.

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벼, 현미, 백미 및 왕겨의 흡습평형함수율 (Adsorption Equilibrium Moisture Content of Rough Rice, Brown Rice, White Rice and Rice Hull)

  • 금동혁;김훈
    • Journal of Biosystems Engineering
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    • 제26권1호
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    • pp.57-66
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    • 2001
  • This study was performed to determine adsorption equilibrium moisture contents of rough rice, brown rice, white rice and rice hull grown in Korea. EMC values were measured by static method using saturated salt solutions at three temperature levels of 20$\^{C}$, 30$\^{C}$ and 40$\^{C}$, and eight relative humidity levels in the range from 11.2% to 85.0%. The measured EMC values were fitted to modified Henderson, Chung-Pfost, and modified Oswin models by using nonlinear regression analysis. The results of comparing root mean square errors for three models showed that modified Henderson and Chung-Pfost models could serve as good models, and that modified Oswin model could not be applicable to rough rice, brown rice, white rice and rice hull.

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