• Title/Summary/Keyword: ACID property

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Effect of Ozone Treatment on the Changes of Fatty Acids, Organic acids, and Sensory Properties in Ginseng Powder (오존처리가 인삼분말의 지방산과 유기산 함량 및 향미특성에 미치는 영향)

  • 곽이성;최강주;김나미
    • Journal of Food Hygiene and Safety
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    • v.11 no.1
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    • pp.51-55
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    • 1996
  • As a preliminary experiment to investigate the effect of ozone sterelization on the ginseng powder, the changes of fatty acid composition and organic acid content and sensory properties in ginseng powder treated with ozone was investigated. Ginseng powder was treated with 0.5 ppm ozone for 24 hours and 48 hours, respectively. With increase in ozone treatment time, the content of crude lipid and increase. Contents of unsaturated fatty acid-linolenic acid, linoleic acid, and oleic acid, etc.-decreased with ozone treatment time, whereas saturated fatty acid or same number-stearic acid-increased odor, bitter taste, roasted taste and sweet taste were thiner with ozone treatment times, but pungent taste was thicker with those treatment. These changes of ordors and tastes of ginseng powder with ozone treatment were predicted by oxydation of lipids, flavor components and saponins.

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The Effects of Starch Addition on Acid Production By Lactic Acid Bacteria and Quality of Curd Yogurt (전분의 첨가가 호상요구르트에서 젖산균의 산생성과 요구르트의 품질에 미치는 영향)

  • Em, Sung-Sin;Yoo, Ji-Chang;Ko, Young-Tae
    • Korean Journal of Food Science and Technology
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    • v.25 no.6
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    • pp.747-752
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    • 1993
  • A curd yogurt was prepared from milk added with skim milk powder or four kinds of starch such as rice starch, wheat starch, corn starch and potato starch. The effects of starch addition at 2%(w/v) level on acid production by lactic acid bacteria in milk was investigated. The effects of starch addition on quality of curd yogurt in terms of apparent viscosity, sensory property and volatile aroma compounds were also examined. Addition of starch markedly stimulated the acid production by lactic acid bacteria. Among four organisms tested, Lactobacillus jugurti produced the highest amount of acid. Apparent viscosity of curd yogurt added with starch was significantly higher than that of control. Curd yogurt fermented with L. jugurti showed pseudoplastic and thixotropic characteristics. Sensory property of curd yogurt added with corn starch or rice starch was evaluated as slightly better than reference sample, but that with potato starch was evaluated as the worst among all samples. Acetaldehyde, acetone, ethanol and butanol were detected by gas chromatographic analysis.

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Effect of the Addition of Schisandra chinensis Powder on the Physico-chemical Characteristics of Sausage

  • Jin, S.K.;Park, J.H.
    • Asian-Australasian Journal of Animal Sciences
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    • v.26 no.12
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    • pp.1753-1761
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    • 2013
  • The individual and interactive effects of Schisandra chinensis powder (SCP) and sodium nitrite additions on color, pH, water holding capacity, residual nitrite, 2-thiobarbituric acid reactive substances (TBARS), volatile basic nitrogen, texture properties, fatty acids, amino acids and sensory evaluation of cooked pork sausages were investigated after 20 d of storage at $4^{\circ}C$. The powders (0, 0.5 and 1.0%) were added to sausages either alone or in combination with nitrite (0 and 100 ppm). SCP added-sausages showed lower $L^*$ (lightness) and W (whiteness) values, and higher $b^*$ (yellowness) values than sausage containing no nitrite, and exhibited the highest $a^*$ values at a 0.5% addition (p<0.05). Residual nitrite and TBARS values were found to be significantly reduced as the addition levels of SCP increased (p<0.05). As the addition of SCP increased, the sausage showed gradually decreased brittleness, cohesiveness, springiness, gumminess and chewiness, while adhesiveness increased. Polyunsaturated fatty acid, n-6 and n-6/n-3 fatty acid ratio concentrations were significantly higher in sausages containing SCP (p<0.05). The addition of SCP to sausage significantly (p<0.05) increased the ammonia content (by 0.5% SCP) and aromatic amino acid concentrations (by 1.0% SCP) (p<0.05). Inclusion of SCP in sausage meat resulted in a significant deterioration in quality characteristics of flavor, springiness, juiciness and overall acceptability (p<0.05). As expected, the observed changes in $a^*$, W, pH, shear force, texture property, TBARS, fatty acid, amino acid and sensory score of sausages, depended on the rate of addition of nitrite (p<0.05). These results suggest that SCP addition is not an effective way of improving the sensory evaluation of sausages, but may beneficially affect TBARS, nitrite scavenging activity, fatty acid and amino acid content in pork sausages.

Effect of Storage Period of Rice on Quality of Rice Added Yogurt (쌀의 저장기간이 쌀 첨가 요구르트의 품질에 미치는 영향)

  • Paik, Ji-Hye;Ko, Young-Tae
    • Korean Journal of Food Science and Technology
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    • v.24 no.5
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    • pp.470-476
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    • 1992
  • The curd yogurt was prepared from milk added with skim milk powder or three Tongil rices of different storage period. The effect of storage period of rice on acid production by lactic acid bacteria in milk containing rice of 2%(w/v) was investigated. The effect of storage period of rice on quality of curd yogurt(sensory property, viscosity and keeping quality) was also examined. Addition of rice stimulated acid production by lactic acid bacteria more than control(milk yogurt). Storage period of rice did not significantly affect acid production by lactic acid bacteria though stimulating effect of rice on acid production was slightly different among species. Sensory property of curd yogurt added with rice was not significantly affected by storage period of rice. Apparent viscosity of curd yogurt added with rice increased in proportion to storage period of rice. Curd yogurt showed characteristics of thixotropic flow. When curd yogurt added with rice was kept at $5^{\circ}C$ for 15 days, its keeping quality was relatively good and was not markedly affected by storage period of rice.

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The Effects of Egg White Powder Addition on Acid Production by Lactic Acid Bacteria and Quality of Curd Yogurt (난백분말의 첨가가 호상요구르트에서 젖산균의 산생성과 요구르트의 품질에 미치는 영향)

  • Ko, Young-Tae
    • Korean Journal of Food Science and Technology
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    • v.27 no.4
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    • pp.458-463
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    • 1995
  • A curd yogurt was prepared from milk added with skim milk powder or egg white powder(EWP). The effects of EWP addition on growth and acid production by lactic acid bacteria in milk were studied. The effects of EWP addition on quality of curd yogurt in point of apparent viscosity, sensory property and volatile aroma compounds were also investigated. Addition of PAT markedly stimulated acid production by lactic acid bacteria and stimulating effect of EWP on acid production was proportional to the amount of addition. Apparent viscosity of curd yogurt added with EWP was generally higher than that of control. Curd yogurt fermented with L. acidophilus showed thixotropic characteristics. Sensory property of curd yogurt added with EWP was evaluated as better than reference sample and sample added with EWP at 2% level was evaluated as better than other samples. Acetone, ethanol, diacetyl, butanol and acetoin were detected by gas chromatographic analysis.

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Study on Dyeing Properties of Nylon 66 Nano Fiber (1) -Levelling Type Acid Dyes- (나일론 66 나노섬유의 염색성에 관한 연구(1) -균염성 산성염료-)

  • 이권선;이범수;박영환;김성동;김용민;오명준;정성훈
    • Textile Coloration and Finishing
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    • v.16 no.4
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    • pp.1-9
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    • 2004
  • In recent, development of nano fiber has been one of the most active subjects in the world. Nano fiber is defined as a ultra fine yarn with a diameter unit of $10-100\times10^{-9}meter$, which is possible to be produced by an electro-spinning technology. In this study, physical characteristics and dyeing properties of nylon 66 nano fiber were investigated. Nylon 66 nano fiber was dyed with levelling type acid dyes. X-ray diffraction method and DSC analysis were used for the measurement of the degree of crystallization. Analysis of amino end groups was also performed in order to examine a relationship between number of amino groups and its dyeing property as well as water absorption behavior. The maximum exhaustion % of dyes and dyeing rate under various dyeing conditions, such as dyeing temperature and pH in dye bath, along with build-up properties for 2 acid dyes were evaluated. It was found that the degree of crystallization of nano fiber was smaller than that of regular fiber, and amino end groups of nano fiber were less than regular fiber. Half dyeing time of nano fiber was shorter than regular fiber because of the bigger specific surface area. Effect of pH on exhaustion % was small in case of nano fiber. Exhaustion of nano fiber increased with higher concentration of dye.

Study on air-water interface phenomenon and electrical property of Arachidic acid LB films (LB법을 이용한 Arachidic acid LB막의 공기-물 계면현상과 전기적특성 연구)

  • Ryu, Kil-Yong;Lee, Nam-Suk;Park, Jae-Chul;Choi, Yong-Sung;Lee, Kyung-Sub;Kwon, Young-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.11a
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    • pp.263-264
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    • 2006
  • 본 연구에서는 Arachidic acid Langmuir-Blodgett (LB)막의 계면특성과 전기적 특성을 측정하였다. Arachidic aicd는 포화지방산으로 ($CH_3(CH_2)_{18}COOH$)의 구조를 가지며, 크기가 27.5[$\AA$]으로 $CH_3(CH_2)_{18}$의 소수기와 COOH의 친수기로 구성되어 있다. LB막은 박막제작시 배열과 배향의 제어가 용이하다. Chloroform을 용매로 하여 2[mmol/l]의 농도를 조성하여 ${\pi}-A$ 등온선을 통해 기체 상태, 액체 상태, 고체 상태를 관찰하였으며 편광각 현미경 (Brewster angle microscopy) 이미지를 통해 각 상태에서의 이미지를 관찰하였다. 또한 LB막의 제작시 사용되어진 ITO 기판은 친수처리 전 후의 접촉각의 측정을 통하여 막의 안정성을 확인하였다. 또한 LB막을 Metal/LB막/Metal 구조의 소자로 제작하여 전압-전류 특성을 측정하였다.

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LAND FARMING OF WATER PLANT ALUM SLUDGE ON ACID MINERAL SOIL AFFECTED BY ACID WATER

  • Lee, Seung-Sin;Kim, Jae-Gon;Moon, Hi-Soo;Kang, Il-Mo
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2001.04a
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    • pp.182-186
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    • 2001
  • An acid forest surface soil as a land farming medium was treated with a water plant alum sludge at 0 to 18%. Indian mustard was grown in the treated soil in a greenhouse for 5 weeks and watered with pH 4 tap water adjusted with a mixed acid (1HNO$_3$: 2H$_2$SO$_4$) during plant growth. Changes in soil property, leachate chemistry, plant growth, and plant uptake of elements by the sludge treatment were determined. The alum sludge treatment increased buffer capacity to acidity, hydraulic conductivity, water holding capacity, and phosphate adsorption of the soil and decreased bulk density and mobility of small particles. The sludge treatment reduced leaching of Al, Mg, K, Na, and root elongation. Plant did uptake less amount of the cations and P but more Ca with the sludge treatment.

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