• Title/Summary/Keyword: syneresis

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Physicochemical and Sensorial Properties of Probiotic Yogurt as Affected by Additions of Different Types of Hydrocolloid

  • Bahrami, Masoud;Ahmadi, Dariush;Alizadeh, Mohammad;Hosseini, Fakhrisadat
    • Food Science of Animal Resources
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    • v.33 no.3
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    • pp.363-368
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    • 2013
  • The main attributes of yogurt that affect consumer satisfaction are taste, consistency, and a firm texture. This study evaluates the influence of xanthan gum, barley beta-glucan, and guar gum in concentrations of 0.05%, 0.1%, 0.2%, and 0.3% on probiotic yogurt. The set-type yogurt samples were prepared by using raw cow's milk. The statistical analysis showed that none of these gum additions had any marked effect on pH, titratable acidity, total solids content, and probiotic bacteria counts of yogurt samples. Evaluations for syneresis and water-holding capacity (WHC) in the yogurt samples were affected by the type and concentration of the stabilizer. Yogurts treated with 0.1% xanthan gum and 0.3% beta-glucan recorded the highest WHC and the least syneresis. The largest amount of gel firmness was recorded in yogurt samples treated with 0.2% xanthan gum and 0.3% beta-glucan. Yogurt samples treated with 0.1% xanthan gum and 0.3% beta-glucan were considered acceptable by trained panelists and gained the highest scores in sensory evaluations. The correlation coefficient between the amount of syneresis, WHC and stiffness of texture was significant compared to scores for sensory evaluation (p<0.01). Results for effects of guar gum on the tested parameters were contrary to the results expected from a gum. According to this study, the use of xanthan gum and beta-glucan are highly recommended for low-fat yogurt production.

Comparison on Retrogradation Properties of Cowpea and Mung Bean Starch Gels (동부와 녹두전분 Gel의 노화특성 비교)

  • Yoon, Gae-Soon
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.21 no.6
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    • pp.672-676
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    • 1992
  • Retrogradation properties of cowpea and mung bean starch gels were investigated by rate of retrogradation, X-ray diffraction patterna and syneresis of gels. Retrogradation time constant of mung bean starch gel(30%) by Avrami equation had a similar value to that of cowpea starch gel. X-ray diffraction patterns of the two retrograded starch gels(10%) were B-type. The extent of retrogradation determined by syneresis showed that cowpea starch gel was a little larger than that of mung bean starch gel(6~10%).

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Quality Characteristics of Mixed Polysaccharide Gels with Various Kiwifruit Contents by Freeze-Thawing (키위 첨가 다당류 흔합겔의 냉동ㆍ해동에 따른 품질 특성)

  • 윤혜신;오명숙
    • Korean journal of food and cookery science
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    • v.19 no.6
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    • pp.758-764
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    • 2003
  • This study was performed to determine the quality characteristics of mixed polysaccharide gels made from kcarrageenan and locust bean gum with various kiwifruit content after freeze-thawing. The syneresis, rupture properties, TPA properties and sensory properties of the mixed polysaccharide gels with various kiwifruit contents after freeze-thawing were measured. The syneresis of the gel with various kiwifruit contents by freeze-thawing was not significantly different, whereas repeating freeze-thawing resulted in remarkable increase in the syneresis of the mixed polysaccharide gels with 5%, 20% and 40% kiwifruit. In terms of the rupture properties, the rupture stress, rupture energy and rupture strain decreased with increasing kiwifruit content after freeze-thawing. In terms of the TPA properties, the adhesiveness, hardness and chewiness increased and the cohesiveness decreased with increasing kiwifruit content after freeze-thawing. The rupture properties, springiness and cohesiveness of the gel by freeze-thawing were lower than those of the gel stored in the refrigerator. In contrast, the gumminess, hardness and chewiness of the gel after freeze-thawing were higher than those of the gel stored in the refrigerator. The results showed that the gel became crumbly and tough as a result of freeze-thawing. In the sensory evaluation, He overall acceptability of the gel after freeze-thawing was highest at the 30% kiwifruit content, and differences in the sensory properties between the gel after freeze-thawing and that stored in the refrigerator were small. Therefore, mixed polysaccharide gels with kiwifruit after freeze-thawing could be useful despite the small decrease in quality.

Studies on the Optimum Models of the Dairy Product Kou Woan Lao Using Response Surface Methodology

  • Weng, Wei-Lien;Liu, Vi-Chung;Lin, Chin-Wen
    • Asian-Australasian Journal of Animal Sciences
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    • v.14 no.10
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    • pp.1470-1476
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    • 2001
  • Kou Woan Lao is an oriental-style dairy product, which is coagulated by milk-clotting enzyme from the culture filtrate of lao-chao. The product appears smooth, sweet, slightly wine flavour, and the flavour differs from yogurt. The aim of this study was to search for the optimum model to shorten the period of manufacture, and to improve the quality of Kou Woan Lao. A response surface design was used for studying the effects of addition of carrageenan, locust bean gum, and culture filtrate from lao-chao on the curd firmness, viscosity, and syneresis. Results indicated that the best rheological property, preservative quality and acceptability of Kou Woan Lao could be obtained by the combination of 0.22% carrageenan, 0.21 % locust bean gum and 12% culture filtrate from lao-chao. The curd firmness, viscosity and syneresis of resultant product were 29.3 g, 21,347.7 cps, and 8.92%, respectively and the microstructure of the curd revealed a relatively complete three-dimensional spider web-like structure.

Development & Characteristics of the Permanent Grout based on Colloidal Silica (실리카 콜로이드를 기재(基材)로 한 항구그라우트(PSG)의 개발과 공학적 특성)

  • Ryu, Dong-Sung;Jeong, Gyung-Hwan;Lee, Sng-Kook;Lee, Jun-Seok
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.189-196
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    • 2004
  • In this study, the colloidal silica grouts (PSG) with novel chemical compositions for permanent reinforcement and water cut-off of the ground were prepared and their engineering charateristics were investigated. The optimum mixing recipes for both homogeneous solution grouts and heterogeneous suspension grouts were investigated and established through many repeated lab tests. The various physical properties(such as compressive strength, durability and syneresis) of the grout gels derived from the colloidal silica were investigated and compared with those of the well-known existing watergalss grouts. The all experimental results showed that the novel colloidal silica grouts(PSG) had greatly excellent performances as permanent grouts, especially in comparison with the existing watergalss grouts.

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Effect of Cooking Method and Additives on the Freeze-Thaw Stability of Mung Bean Starch Paste for Preparation of Omija-eui

  • Han, Hyun-Jeong;Jang, Keum-Il;Bae, In-Young;Lee, Kwang-Yeon;Koo, Seung-Hyun;Kim, Mi-Kyung;Jun, Soo-Jin;Lee, Hyeon-Gyu
    • Food Science and Biotechnology
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    • v.18 no.5
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    • pp.1230-1236
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    • 2009
  • Optimum conditions for the freeze-thaw stability (FTS) of mung bean starch (MBS) paste as a main ingredient in omija-eui were investigated. For the optimization of the paste preparation condition, the FTS of MBS prepared by boiling in a shaking water bath (BMSW) or by pressure-cooking in an autoclave (PCMA) were analyzed using a response surface methodology (RSM). In addition, the effects of various additives such as gums, sugars, and emulsifier were evaluated on the FTS of MBS paste prepared under optimal conditions. The predicted maximal FTS of MBS paste prepared by the PCMA method (73%) was higher than that of the paste prepared by the BMSW method (36%). In case of additives, gellan gum and sodium alginate effectively prevented the syneresis of MBS paste in the BMSW method and in the PCMA method, respectively. The use of a fructose fatty acid ester as an emulsifier decreased syneresis in a dose-dependent, while the addition of sugars accelerated syneresis. Consequently, MBS paste for omija-eui preparation may be efficiently prepared by adding sodium alginate and fructose fatty acid ester under the optimal conditions of 4.3% MBS content, $121^{\circ}C$ heating temperature, and $89^{\circ}C$ cooling temperature by pressure-cooking in an autoclave.

Effect of Soaking Conditions on Storage Characteristics of Acorn Mook (수침조건이 도토리 묵의 저장에 미치는 영향)

  • Na, Hwan-Sik;Kim, Kwan
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.31 no.2
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    • pp.221-224
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    • 2002
  • This study was to explain the properties of acorn sediments and characteristics in the texture of acorn mooks due to the differences in preparing conditions of acorn sediments. The hardness of mook increased at 4$^{\circ}C$ during storage. The increase rate of acorn mook's hardness after storage for 24 hrs at 4$^{\circ}C$ were higher than those of others. X-ray diffraction of the retrograded acorn mooks was little different during storage at 4$^{\circ}C$. The syneresis of acorn mook was decreased with increasing the soaking treatment. The syneresis (%) of nontreated sample (0-0) was larger than those of the others.

Quality Characteristics of Mixed Polysaccharide Gels with Various Kiwifruit Contents (키위 첨가량에 따른 다당류 혼합겔의 품질 특성)

  • 윤혜신;오명숙
    • Korean journal of food and cookery science
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    • v.19 no.4
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    • pp.511-520
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    • 2003
  • This study was carried out to determine the effects of various contents of kiwifruit contents on the quality characteristics of mixed polysaccharide gels made from $\kappa$-carrageenan and locust bean gum. The color value, gelling temperature, melting temperature, break down rate, syneresis, rupture properties, TPA properties and sensory properties of mixed polysaccharide gels with various contents of kiwifruit contents were measured. As the kiwifruit contents was increased, the lightness (L), yellowness (b) and greenness (-a) of the mixed polysaccharide gels increased. There were no differences in the color values of gels during storage. As the kiwifruit content was increased, the gelling and melting temperatures of the mixed polysaccharide gels also increased. The mixed polysaccharide gels with high kiwifruit contents were difficult to melt, and it seemed that the addition of kiwifruit to the mixed polysaccharide gels could improve the thennal stability of the gels. The syneresis of the gel increased with increasing storage time, whereas the addition of kiwifruit to the gel resulted in suppression of syneresis. With regard to the rupture properties, stress, energy and strain, they were all decreased with increasing kiwifruit contents. The TPA properties, adhesiveness, hardness and chewiness increased and cohesiveness decreased with increasing kiwifruit contents. The results showed that the gel became tough and adhesive, and could be easily broken under small deformation, with increasing kiwifruit contents. The sensory evaluation showed that the green color, aroma, sweetness and sourness increased with increasing kiwifruit contents. The texture, adhesiveness, springiness and cohesiveness decreased, and brittleness and hardness increased, with increasing kiwifruit contents. The overall acceptability of the gel with 30% kiwifruit content was the highest. Thus, mixed polysaccharide gels made from kiwifruits could be useful, as the addition of kiwifruit to a mixed polysaccharide gel results in a good aroma, taste and stability, despite a lowering of the textural properties.

Physicochemical Properties of Modified Rice Powder for Rice-Based Infant Foods III -Acetylated-coss linkage treatment on rice powder (반고형 이유식의 개발을 위한 변형 쌀가루 제조 및 이화학적 특성 III - 초산-처리 쌀가루)

  • Choi, Jung-Sun;Sohn, Kyung-Hee;Choi, Hee-Sun
    • Journal of the Korean Society of Food Culture
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    • v.12 no.5
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    • pp.469-475
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    • 1997
  • The modification of rice powder was attempted by treatment of acetic acid and epichlorohydrin to improve the functional properties of baby food. The initial gelatinization temperature of rice powder determined by amylograph was decreased from $79.5^{\circ}C$ to $63^{\circ}C$ by modification. The apparent and maxium viscosity of rice paste at $95^{\circ}C$ before and after modification were increased from 92B.U. to 236B.U. and from 100B.U. to 202B.U., respectively. The light transmittance of modified rice paste was increased from the temperature of $60^{\circ}C$ and by increasing the degree of substitution at the fixed temperature, while decrease more or less by the treatment of epichlorohydrin. The degree of retrogradation of the paste was decreased from 28.7 to 18.0 upon modification. The rate of syneresis of modified rice powder was decreased with increasing the drgree of substitution and ,the extend of epichlorohydrin treatment. Syneresis was not observed when acetylated rice powder whose DS value is 0.048 was treated with 0.25% of epichlorohydrin for the formation of cross-linkage. The addition of modified rice powder in preparation of semi-solid type infant food could improve the quality without lowering overall digestibility.

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Physicochemical Properties of Mung Bean Starch Paste, a Main Ingredient of Omija-eui

  • Jang, Keum-Il;Han, Hyun-Jeong;Lee, Kwang-Yeon;Bae, In-Young;Lee, Ji-Yeon;Kim, Mi-Kyung;Lee, Hyeon-Gyu
    • Food Science and Biotechnology
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    • v.18 no.4
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    • pp.991-995
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    • 2009
  • As a principle ingredient in omija-eui, the physicochemical properties of mung bean starch (MBS) paste were investigated and compared to those of rice and corn starch. The amylose and the protein content of MBS were higher than those of rice or corn starch while the total sugar content and the swelling power of MBS were lower. In addition, the clarity of MBS paste was higher than either rice or corn starch paste. Regarding pasting properties, the peak viscosity and cool paste viscosity of MBS were higher than those of either rice or corn starch. During the freeze-thaw cycle, MBS exhibited higher degree of syneresis than corn and rice starch, which decreased with high starch concentration and heating temperature. The paste properties and freeze-thaw stability of MBS showed a potential for improving the quality of omija-eui.