• Title/Summary/Keyword: gelatinization degree

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Effect of Cereals on the Physicochemical and Sensory Characteristics of Noti - ll. Study on the Physicochemical and Sensory Characteristics of Glutinous millet Noti - (노티의 재료에 따른 이화학적, 관능적 및 기계적 특성 연구 -제 2보: 차조 노티의 이화학적, 관능적 및 기계적 특성 연구-)

  • 임희정;염초애
    • Korean journal of food and cookery science
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    • v.12 no.2
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    • pp.166-177
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    • 1996
  • This study was undertaken to investigate the effect of cereals on the physicochemical and sensory characteristics of Noti. Noti is one of Korean traditional pan-fried glutinous cereal cakes. In this case, Noti was made from the steamed glutinous millet flour Aspergillus and Penicillium developed in glutinous millet Noti dough from 40th day. The reducing sugar content of glutinous millet Noti was higher than that of the Noti dough during the same period and almost similar as the first day even 90 day storage. The moisture content of glutinous millet Noti was less than 20%. Moisture content of glutinous millet Noti to compare with the common rice cake was from 1/2 to 1/3. While gelatinization degree significantly decreased in the rice cake that did not add malt, glutinous millet Noti did not show decreasing gelatinization degree in comparison with the common rice cake. Overall acceptability was to add 15% malt and keep 6 hr saccharification time at 60$^{\circ}C$. The hard ness of glutinous millet Noti by Instron measurement was slowly increased after the l0th day. Cohesiveness and elasticity were increased during the period of storage.

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Comparison of Differential Scanning Calorimetry with Enzymatic Method for the Determination of Gelatinization Degree of Corn Starch (DSC에 의한 전분의 Endothermic peak와 효소분석법에 의한 호화도 비교)

  • Lee, Boo-Yong;Mok, Chul-Kyoon;Lee, Cherl-Ho
    • Korean Journal of Food Science and Technology
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    • v.25 no.4
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    • pp.400-403
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    • 1993
  • Gelatinization degrees of torn and waxy corn starches in the low-moisture environment were determined by DSC thermogram and enzymatic analysis, the results were compared each other As the moisture content increased from 20% to 70%, the enthalpy of endothermic peak of starch increased linearly in DSC thermograms. When the moisture content exceeded above 70%, the DSC enthalpy of starch remained constant in DSC thermogram. The enthalpies for gelatinization of corn and waxy corn starches were 3.23 cal/g and 4.2 cal/g, respectively. When gelatinization degrees of starches were measured by enzymatic analysis, the gelatinization degree increased linearly as the moisture content increased from 20% to 80%. A linear correlation between DSC and enzymatic analysis was obtained only when the moisture content was under 70%.

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Comparison of Some Properties of Naked Barley Starches (쌀 보리 전분의 성질비교)

  • Kim, Oh-Mok;Kim, Kwan;Kim, Sung-Kon
    • Korean Journal of Food Science and Technology
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    • v.17 no.1
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    • pp.33-36
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    • 1985
  • Some properties of starches from three naked barley cultivars(Songhak, Youngsan and Jinan 56) were compared. No significant differences in water-binding capacity, amylose content, relative crystallinity, swelling power and gelatinization degree at various pasting temperatures among cultivars were observed. However, starches showed characteristic viscograph indices and viscosity development patterns in aqueous sodium hydroxide solution. Songhak starch exhibited the lowest pasting temperature and was the most resist to alkali gelatinization.

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Effects of Addition Ratio of Pigmented Rice on the Quality Characteristics of Seolgiddeok (유색미의 첨가 비율이 설기떡의 품질 특성에 미치는 영향)

  • 김기숙;이재경
    • Korean journal of food and cookery science
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    • v.15 no.5
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    • pp.507-511
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    • 1999
  • This study was carried out to investigate the effects of addition ratio of pigmented rice(Suwon 415) on the color difference, mechanical characteristics and gelatinization degree, sensory characteristics of Seolgiddeok. As the amount of pigmented rice was increased, the redness was increased, however, the lightness and yellowness were decreased. The hardness, adhesiveness, cohesiveness and chewiness of, Seolgiddeok were decreased with the increase of pigmented rice content, however, the springiness was increased. As the amount of pigmented rice was increased in Seolgiddeok, gelatinization was getting increased. In sensory evaluation, quality characteristics of Seolgiddeok with pigmented rice was better than those of Seolgiddeok without pigmented rice. Especially, Seolgiddeok with 20% pigmented rice added had the best score in color, sweetness, flavor and overall quality.

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Effects of Addition Ratio of Reddish-brown Pigmented Rice on the Quality Characteristics of Seolgiddeok (적갈색 유색미의 첨가 비율이 설기떡의 품질 특성에 미치는 영향)

  • 이재경;김기숙;이건순
    • Korean journal of food and cookery science
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    • v.16 no.6
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    • pp.640-643
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    • 2000
  • This study was carried out to investigate the effects of addition ratio of reddish-brownpigmented rice(Suwon 451) on the color difference, mechanical characteristics and gelatinization degree, sensory characteristics of Seolgid-deok. As the amount of reddish-brown pigmented rice was increased, redness was getting increased, lightness and yellowness was getting decreased. In hardness, adhesiveness, cohesiveness and chewiness, as the amount of pigmented rice was increased, was getting decreased and springiness was getting increased. As the amount of pigmented rice was increased in Seolgiddeok, gelatinization was getting increased. In sensory evaluation, quality characteristics of Seolgiddeok with 20% reddish-brown pigmented rice added was better in color, sweetness and overall quality than those of Seolgiddeok without reddish-brown pigmented rice.

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Effect of Cereals on the Physicochemical and Sensory Characteristics of Noti - III. Study on the Physicochemical and Sensory Characteristics of Glutinous Chinese millet Noti - (노티의 재료에 따른 이화학적, 관능적 및 기계적 특성 연구 -제 3 보: 찰기장 노티의 이화학적, 관능적 및 기계적 특성 연구-)

  • 임희정;염초애
    • Korean journal of food and cookery science
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    • v.12 no.3
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    • pp.320-330
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    • 1996
  • This study was undertaken to investigate the effect of cereals on the physicochemical and ,sensory characteristics of Noti. Noti is one of Korean traditional pan-fried glutinous cereal cakes. In this case, Noti was made from the steamed glutinous Chinese millet flour. Acid value was not increased abruptly. TBA value was maintained, reducing sugar content was increased, and the average value of gelatinization degree was increased as compared with the first day that glutinous Chinese millet Noti was made during 90 day storage. Through sensory evalution, flavor, consistency(the inner part), and moistness were unfavorable according to the storage. The texture tended to increase depending upon the storage period. The hardness of glutinous Chinese millet Noti by Instron measurement was slowly increased. Cohesiveness and elasticity were increased during storage.

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Change in Physical Properties of Cold-Extruded Brown Rice and Vegetable Mix at Various Pregelatinized Brown Rice Content and CO2 Gas Injection (예비호화 현미분 함량과 CO2 가스 주입량에 따른 저온 현미-야채류 압출성형물의 물리적 특성 변화)

  • Gil, Sun-Kook;Choi, Ji-Hye;Ryu, Gi-Hyung
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.43 no.11
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    • pp.1716-1723
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    • 2014
  • This study was designed to examine the change in physical properties of extruded brown rice-vegetable mix at different pregelatinized brown rice contents and $CO_2$ gas injection. Moisture content, screw speed and die temperature were fixed to 30%, 100 rpm and 60, respectively. $CO_2$ gas injection was adjusted to 0, 300, 600, and 800 mL/min. The content of vegetables (carrot, pumpkin, kale and Angelica keiskei) mix was fixed 5%. Pregelatinized and raw brown rice powder were blended as the ratio of 0/95, 30/65 and 50/45. Specific mechanical energy input decreased as pregelatinized brown rice ratio increased. Expansion index increased and the size and number of pores increased but density decreased with the increasing in $CO_2$ gas injection. Gelatinization degree increased as $CO_2$ gas injection increased. In conclusion, cold extrusion with $CO_2$ gas injection at $60^{\circ}C$ die temperature could be applied for Saengsik (uncooked food) making.

Effect of Moisture Content on Viscosity of Starch Dough (전분반죽의 점도에 미치는 수분함량의 영향)

  • Lee, Boo-Yong;Lee, Chang-Ho;Lee, Cherl-Ho
    • Korean Journal of Food Science and Technology
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    • v.27 no.4
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    • pp.582-592
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    • 1995
  • To measure rheological properties of the starch dough, an Extrusion Capillary Viscometer(ECV) cell was self-made and attached to Instron machine(Model 1140). Apparent viscosities of corn and waxy corn starch doughs were measured and their gelatinization degrees were determined by enzymatic analysis. When corn and waxy corn starch doughs with $36{\sim}52%$ moisture content were heated at $60{\sim}100^{\circ}C$, come-up time of the cold point of doughs decreased from 220 sec to 140 sec with increased in the moisture content. In the measurement range of $36{\sim}52%$ moisture content and $60{\sim}100^{\circ}C$ heating temperature, both corn and waxy corn starch doughs showed pseudoplastic flow behaviors. At the same shear rate, both shear stress and viscosity of starch dough decreased as the moisture content increased. At the moisture content above 44%, the shear stress and viscosity of starch dough decreased as the heating temperature increased from $60^{\circ}C\;to\;70^{\circ}C$, but increased as the heating temperature increased from $80^{\circ}C\;to\;100^{\circ}C$. When the moisture content increased and heating temperature, the gelatinization degree of starch dough increased from about 10% to about 62%. The gelatinization degree of waxy corn starch dough was $15{\sim}20%$ higher than that of corn starch dough under the same gelatinization conditions. The effects of moisture content on the viscosity of starch dough were examined by Arrhenius equation. As the moisture content increased, viscosity of starch dough decreased. But the effect of moisture content was greater in the range of $80{\sim}100^{\circ}C$ than in the range of $60{\sim}70^{\circ}C$ heating temperature.

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Studies on the Processing Properties and Interactions Between Porcine Blood Proteins and Waxy Rice Starch During Making Porcine Blood Cake

  • Lin, Chin-Wen;Yang, Jeng-Huh;Chu, Hsien-Pin;Su, Ho-Ping;Chen, Hsiao-Ling;Huang, Chia-Cheong
    • Asian-Australasian Journal of Animal Sciences
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    • v.14 no.3
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    • pp.358-364
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    • 2001
  • The physiochemical properties and interactions between porcine blood and waxy rice were determined. Addition of calcium chloride (0.15%) improved acceptability of blood cake and increased the gelatinization degree of waxy rice. The water-holding capacity of porcine blood gel (blood/water=60/40, v/v), extent of absorption and gelatinization of waxy rice, and scanning electron microscopy showed that blood protein matrix and waxy rice are competitors for holding water in the cooking procedure. Non-haem iron content increased linearly (R=0.95) when heating temperature rose. The presence of blood proteins caused increasing of peak temperature (Tp) of gelatinization in differential scanning calorimetric thermal gram, The microstnlcture of plasma proteins and haemoglobin appeared continuous changes, and interacted with surface of waxy rice flour in terms of network and mosaic form, respectively. The electrophoretic patterns revealed an interaction between plasma proteins and waxy rice glutelin and haemoglobin when heated could be found at temperatures above $60^{\circ}C$.

Gelatinization Properties of Starch Dough with Moisture Content, Heating Temperature and Heating Time (수분함량, 가열온도 및 가열시간에 따른 전분 반죽의 호화특성)

  • Lee, Boo-Yong;Lee, Chang-Ho;Lee, Cherl-Ho
    • Korean Journal of Food Science and Technology
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    • v.27 no.3
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    • pp.428-438
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    • 1995
  • The gelatinization properties of corn and waxy corn starch doughs were examined at various moisture contents, heating temperatures and heating times. The onset temperatures of gelatinization with 1% CMC using Brabender Amylograph were $64^{\circ}C$ for both corn and waxy corn starch. In the gelatinization properties using DSC, onset temperature$(T_o)$, maximum peak temperature$(T_p)$, completion temperature$(T_c)$ and enthalpy of the corn starch were $68.15^{\circ}C,\;74.01^{\circ}C,\;85.65^{\circ}C$ and $3.2\;cal/gram$ respectively. While those of the waxy corn starch were $68.24^{\circ}C,\;75.43^{\circ}C,\;93^{\circ}C$ and $4.2\;cal/gram$ respectively. In enzymatic analysis, when the moisture content increased from 36% to 52% and heating temperature from $60^{\circ}C$ to $100^{\circ}C$, the gelatinization degree of starch dough increased from about 10% to about 62%. The gelatinization degree of waxy corn starch dough was $15{\sim}20%$ higher than that of corn starch dough under the same gelatinization conditions. The regression equations of gelatinization degree (Y) of starch dough in the range of $36{\sim}52%$ moisture content $(X_1)\;60{\sim}100^{\circ}C$ heating temperature $(X_2)\;and\;0{\sim}2.0$ min heating time $(X_3)$ were examined using response surface analysis. The regression equation of corn starch dough was: $Y=28.659+8.638\;X_}+15.675\;X_2+7.770\;X_3-1.620\;{X_1}^2+10.790\;X_1X_2-4.220\;{X_2}^2+0.510\;X_1X_3+1.980\;X_2X_3-6.850\;{X_3}^2\;(R^2=0.9714)$ and that of waxy corn starch dough was: $Y=32.617+12.535\;X_1+20.470\;X_2+8.608\;X_3+4.093\;{X_1}^2+13.550\;X_1X_2-4.467\;{X_2}^2+1.560\;X_1X_3+2.160\;X_2X_3-9.527\;{X_3}^2$\;(R^2=0.9621)$. As the moisture content, heating temperature and heating time increased, the reaction rate constant(k) of gelatinization increased. The greatest reaction rate constant was observed at initial 0.5 min heating time of 1st gelatinization stage. At the heating temperature of $90^{\circ}C$, gelatinization of starch dough was completed almost in the initial 0.5 min heating time. The reaction rate constant of waxy corn starch dough was higher than that of corn starch dough under the same gelatinization conditions. At the 52% moisture content, the regression equation between reaction rate constant(k) and heating temperature(T) for corn starch dough was $log\;k=11.1140-4.1226{\times}10^3(1/T)$ (r=-0.9520) and that of waxy corn starch dough was $log\;k=10.1195-3.7090{\times}10^3(1/T)$ (r=-0.9064).

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