• Title/Summary/Keyword: physicochemical properties

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Physicochemical Properties and Consumer Acceptability of Commercial Gang-jeong (시판 강정류의 이화학적 특성 및 소비자 기호도에 관한 연구)

  • Ryu, Ji-Hye;Kwon, Yong-Suk;Kim, Kyoung-Mi;Lee, Jin-Young
    • Journal of the Korean Society of Food Culture
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    • v.29 no.6
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    • pp.637-647
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    • 2014
  • This study was conducted to examine the physicochemical properties and consumer acceptability of commercial Gang-jeong. The samples used in this study were nine different Gang-jeong as commercial products. To accomplish this research, the physicochemical properties of nine samples, including moisture, crude lipid, sugar contents, acid value, color values, and texture, were measured. In addition, consumer panels evaluated the overall acceptability, appearance, flavor, sweetness, and texture of samples using a 9-point Likert type scale as well as the perceived intensities of sweetness and rancid odor by a 9-point Just-About-Right (JAR) scale. All data were statistically analyzed using One-way ANOVA, Principle Component Analysis, Hierarchical Cluster Analysis, and Pearson's Correlation Analysis. All physicochemical properties were significantly different among the samples (p<0.001). Analyses of consumer acceptability and JAR ratings of the nine samples showed significant differences (p<0.001).

Identification of Workflow for Potential Contaminants and their Physicochemical Properties (불특정 오염부지에 대한 잠재적 오염물질 선정 및 물리·화학적 특성 정보화)

  • Kim, Yoon Ji;Kim, Youn-Tae;Han, Weon Shik;Lee, Seunghak;Choung, Sungwook
    • Journal of Soil and Groundwater Environment
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    • v.24 no.2
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    • pp.8-22
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    • 2019
  • Among numerous chemicals used globally, the number of emerging contaminants is increasing. Numerical modeling for contaminant fate and transport in the subsurface is critical to evaluate environmental and health risk. In general, such models require physicochemical properties of contaminants as input values, which can be found in numerous chemical databases (DB). However, there exist lack of information specific to recently emerging contaminants, which requires estimation of physicochemical properties using regression programs. The purpose of the study is to introduce the workflow for identifying physicochemical properties of potential contaminants utilizing numerous chemical DBs, which frequently lists up potential contaminants for estimating chemical behavior. In this review paper, details of several chemical DBs such as KISChem, TOXNET, etc. and regression programs including EPI $Suite^{TM}$, ChemAxon, etc. were summarized and also benefit of using such DBs were explained. Finally, a few examples were introduced to estimate predominant phase, removal ratio, partitioning, and eco-toxicities by searching or regressing physicochemical properties.

Influence of Functionalization on Physicochemical Properties of Multi-walled Carbon Nanotubes/Epoxy Matrix Nanocomposites

  • Seo, Min-Kang;Park, Soo-Jin
    • Bulletin of the Korean Chemical Society
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    • v.30 no.1
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    • pp.124-128
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    • 2009
  • In this study, the effect of multi-step purification or functionalization on physicochemical properties of multi-walled carbon nanotubes (MWNTs)/epoxy (EP) nanocomposites was investigated. The nanocomposites containing multi-step purified MWNTs showed a stronger influence on $T_g$ and increased in mechanical properties in comparison to nanocomposites containing the same amount of only purified MWNTs. Consequently, the multi-step purification of MWNTs led to an improvement of thermomechanical properties of nanocomposites, resulting from improving the intermolecular interaction of MWNTs in epoxy matrix resins.

Comparative Effect of ${\gamma}$-Irradiation and Ozone Treatment for the Improvement of Hygienic Quality of Dried-Angelica Keiskei Koidz Powder (신선초 분말의 위생화를 위한 오존처리와 감미선 조사와의 비교 효과)

  • 변명우;육홍선;김정옥;김종군;이현자
    • Journal of Food Hygiene and Safety
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    • v.12 no.2
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    • pp.111-116
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    • 1997
  • For the purpose of improving hygienic quality of dried-Angelica Keiskei Koidz powder, the effect of ozone treatment and gamma irradiation on the microbial decontamination and physicochemical properties were investigated. Gamma irradiation at 5 to 7.5 kGy resulted in sterilizing total aerobic bacteria, molds and coliforms below detective levels, while ozone treatment for 8 hours up to 18 ppm did not sufficiently eliminate the total aerobic bacteria of the sample. The physicochemical properties of the sample were not changed by gamma irradiation up to 7.5 kGy, whereas, ozone treatment caused remarkable changes in pH, TBA value, chlorophyll, carotenoid and fatty acid compositions. Therefore, this investigation demonstrated conclusively that gamma irradiation was more effective than ozone treatment for decontaminating and sterilizing the dried-Angelica Keiskei Koidz powder, with minimal effect on the physicochemical properties analyzed.

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Optimization of Extraction Conditions for Physicochemical Properties of Ethanol Extracts from Chrysanthemum boreale (산국(山菊) 에탄올 추출물의 이화학적 특성에 대한 추출조건의 최적화)

  • 권중호;박난영;이기동;정용진
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.27 no.4
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    • pp.585-590
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    • 1998
  • To renew interest in Chrysanthemum boreale as a traditional food material, response surface methodology was used for optimizing extraction conditions and monitoring physicochemical properties of ethanol extracts from Chrysanthemum petal. The phenolic compounds of ethanol extracts were minimized in 87ml/g(solvent per sample), 21%(ethanol concentration), and 15 hours(extraction time). The physicochemical properties of ethanol extracts were maximized in the conditions of 115ml/g, 98% and 16 hours on yellow color intensity, 143ml/g, 75% and 19 hours on carotenoid content, and 148ml/g, 53% and 18 hours on soluble solid content. Optimum ranges of extraction condition for physicochemical properties of Chrysanthemum boreale were 130~150ml/g, 70~85% and 20~28 hours, respectively. Predicted values at the optimum extraction condition were in good agreement with experimental values.

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Influence of Ice Recrystallization on Rheological Characteristics of Ice Slurries and Physicochemical Properties of Concentrated Milk

  • Park, Sung-Hee;Kim, Jee-Yeon;Hong, Geun-Pyo;Kwak, Hae-Soo;Min, Sang-Gi
    • Food Science and Biotechnology
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    • v.15 no.5
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    • pp.756-762
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    • 2006
  • Freeze concentration of milk was carried out through the controlled recrystallization of ice in a multi-stage freeze concentrator. Rheological characteristics of ice slurries were analyzed to determine efficient concentration levels for the freeze concentration process. It was determined that efficient concentration level was 17% of total solids in the first and 27% in the second stage. Physicochemical properties were compared between freeze concentrated and evaporated milk. Freeze concentrated milk was more similar in color appearance to control milk than was evaporated milk. pH significantly decreased in evaporated milk than in freeze concentrated milk. pH of freeze concentrated milk resulted in similar value to control. These results indicated the advantages of freeze concentration as a non-thermal milk processing technology in terms of physicochemical properties. Consequently, we investigated the influence of ice recrystallization on the rheological characteristics of ice slurries and physicochemical properties of freeze concentrated milk.

Effects of extrusion cooking on physicochemical properties of white and red ginseng (powder)

  • Gui, Ying;Ryu, Gi-Hyung
    • Journal of Ginseng Research
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    • v.38 no.2
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    • pp.146-153
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    • 2014
  • A systematic comparison of the physicochemical properties of white ginseng (WG), extruded white ginseng (EWG), red ginseng (RG), and extruded red ginseng (ERG) was performed. The aim of the present study was to identify the effects of the physicochemical properties of ginseng by extrusion cooking. The highest value of the water absorption index (WAI) was 3.64 g/g obtained from EWG, and the highest value of the water solubility index (WSI) was 45.27% obtained from ERG. The ERG had a better dispersibility compared with other samples. Extrusion cooking led to a significant increase in acidic polysaccharide and total sugar content but resulted in a decrease in crude fat and reducing sugar contents. Enzyme treatment led to a sharp increase in acidic polysaccharide content, especially the cellulose enzyme. Extrusion cooking led to a significant increase in 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and reducing power, and the increases in WG and RG were 13.56% (0.038) and 3.56% (0.026), respectively. The data of this study provide valuable information about the effects of extrusion on quality changes of EWG and ERG.

Physicochemical Properties of Traditional Liquor with Different Brewing Method of Mit-sool (밑술 담금 방법을 달리한 전통주의 이화학적 특성)

  • Chung, Rak-Won
    • Journal of the Korean Society of Food Culture
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    • v.30 no.3
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    • pp.377-386
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    • 2015
  • The purpose of this research was to appraise physicochemical properties by utilizing different Mit-sool, Juk, Seolgi-tteok, and Godubap, to produce traditional liquor. In all experimental plots, pH and amino acidity tended to increase with duration of fermentation. Titratable acidity displayed a very high number on the second day but then tended to decrease as fermentation progressed. Sugar contents were highest on the fourth day and tended to decrease with time. Alcohol content increased sharply at the initial stage of fermentation and increased gradually. On the 15th day, traditional liquor made with Godubap recorded the highest alcohol content. Common free sugar components were glucose and sorbitol. Common free organic acid components were lactic, succinic, citric, tartaric, malic, and acetic acids. Volatile flavor compounds were six alcohols, five esters, three aldehydes, and two ketones. Regarding overall acceptability in the sensory evaluation, traditional liquor using Seolgi-tteok as Mit-sool scored the highest. Overall, even though different types of Mit-sool had different physicochemical properties, there were no significant differences in volatile flavor compounds or sensory evaluation scores.

Effect of Sodium Nitrite, Sodium Chloride and Concentrated Seawater on Physicochemical Properties of Meat Emulsion System

  • Lee, Sol-Hee;Kim, Hack-Youn
    • Food Science of Animal Resources
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    • v.40 no.6
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    • pp.980-989
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    • 2020
  • The objective of this study was to compare the effects of various salts on the physicochemical properties of pork emulsion sausages. Pork sausages were prepared using two different salts, sodium nitrite (SN) and sodium chloride (SC), and concentrated seawater (CSW). The CIE L*, CIE a*, and CIE b*, and chroma values of cooked and uncooked sausages with added CSW were significantly higher than those of the sausages with added SC (p<0.05). However, uncooked and cooked sausages with added SN and CSW had similar CIE a* values (p>0.05). The residual NO2- content of sausages with added CSW was significantly lower than that of sausages with added SN. Addition of CSW to sausages resulted in a higher cooking yield compared to the other treatments (p<0.05). Addition of SC resulted in significantly higher volatile basic nitrogen (VBN) and thiobarbituric acid (TBA) values compared to the other treatments. Furthermore, addition of CSW enhanced important physicochemical properties, including CIE a*, CIE b*, residual nitrite content, cooking yield, VBN, TBA, textural properties, and cross-sectional area.

Physicochemical Properties of Mozzarella Cheese Made by Raw Milk Retentate using Ultrafiltration: A Review (한외여과로 농축된 원유로부터 제조된 Mozzarella 치즈의 이화학적 특성에 관한 연구: 총설)

  • Song, Kwang-Young;Lee, Jong-Ik;Chon, Jung-Whan;Hyeon, Ji-Yeon;Seo, Kun-Ho;Yoon, Yoh-Chang
    • Journal of Dairy Science and Biotechnology
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    • v.29 no.2
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    • pp.1-15
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    • 2011
  • Mozzarella cheese is recently the most consumed cheese in USA, European, South Korea, etc., and also a various different-type Mozzarella cheese could have great market appeal. However, many consumers would be more concerned about the nutritional aspects and physicochemical properties of Mozzarella cheese. Hence, ultrafiltration (UF) as a best tool of solving those concerns has been recognized. The objective of this review's paper would be suggested that the ultrafiltration (UF) techniques could be directly applied for manufacturing various different-type Mozzarella cheese with high physicochemical properties on fulfilling the consumers' various needs and desires for health.

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