• Applied Biological Chemistry
• /
• v.40 no.2
• /
• pp.148-151
• /
• 1997

Platycodon root contains abundant pharmaceutical substances and is widely used as a food and a medicinal herb. To identify the major components of the three-year-old and the 24-year-old platycodon roots cultivated in a local farm were analyzed and compared with their chemical compositions prior to their pharmaceutical substances, which were used as the fundamental data. There were no differences in chemical composition, inorganic compositions and fatty acid compositions between the 24-year-old and three-year-old roots. Total amino acid contents were 375.8 mg% and 891.6 mg% in the 24-year-old and three-year-old platycodcon roots, respectively. Sixteen species of amino acid were identified by amino acid autolyzer except cysteine both in the 24-year-old and three-year-old roots. Linoleic acid, which was the highest fatty acid contained both in the 24-year-old and three-year-old roots, was estimated to be 48.7% and 39.1% of total fatty acids, respectively.

• Korean Chemical Engineering Research
• /
• v.50 no.3
• /
• pp.421-426
• /
• 2012

The effect of synthesis conditions such as various organic material and composition of organic-inorganic material in ozone resistance and surface characteristic of ultraviolet cured organic-inorganic hybrid coating film has been investigated. Organic-inorganic hybrid coating solution was prepared using tetraethoxysilane (TEOS), silane coupling agent methacryloyloxypropyltrimethoxysilane (MPTMS), 2,2,2-trifluoroethylmethacrylate, and various organic materials with acrylate group, bar-coated on substrates using applicator and densified by UV-curing. It was found that ozone resistance and surface hardness of the coating film was increased with contents of TEOS. It was also found that ozone resistance of coating film was increased with contents of 2,2,2-trifluoroethylmethacrylate. On the other hand, surface hardness was decreased with increase of 2,2,2-trifluoroethylmethacrylate. In addition, Surface hardness of coating film was increased with the addition of aliphatic urethane acrylate. It was also found that the transmittance of coating films was not influenced by content of TEOS and 2,2,2-trifluoroethylmethacrylate. In addition, the coating film exhibited high transmittance of above 90%.

• Journal of the Korean Professional Engineers Association
• /
• v.28 no.5
• /
• pp.12-19
• /
• 1995

Korean fresh elephant -foot (Amorphophalus Konjak K. Koch) and its powder were analyzed and compared with foreign samples for the purpose of investigating the physico -chemical characteristics of Korean konjak. The Korean fresh konjak contains 80.64% of moisture and most of the solid component comprises sugar, protein and trace of fat and fibre. The mannan content of Korean konjak powder is far smaller than those of Japanese and Chinese konjak powder. The analysis of the korean konjak protein tells that 45% of glutamic acid, aspartic acid and argi-nine is included other remaining amino acid is larger with the order of valine, serine, leucine, and gly-cine. The Korean konjak contains a moderate amount of K component and other inorganic component increases with the order of P Na and Ca. The yield of konjak refined powder from dried chip was 61% and 51.5% of korean and chinese re-spectively. The whiteness degree of chinese konjak powder was slightly higher than that of korean product but the difference could not be recognized by the naked eye.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.11 no.3
• /
• pp.1027-1034
• /
• 2010

Effects of inorganic nano-powders on the polymerization and thermal degradation kinetics as well as the mechanical properties of polyurethane nano-composites were studied by both the measurement of polymerization temperature as a function of time and non-isothermal thermogravimetric analysis (TGA) as well as the Instron test. As the results from polymerization studies, the reaction rates of MMT-filled PU composites were faster than those of Ce500-filled ones, and moreover, the activation energies using Kissinger method for the thermal degradation of composites were calculated as 139.34 kJ/mol for the Ce500-filled PU composites and 91.12 kJ/mol for MMT-filled one, respectivel, exhibiting that MMT nano-powder seemed to be acting as the catalyst for both polymerization and degradation of PU composites. UTM result, however, showed that tensile strength at break of MMT-filled composites was much higher than that of Ce500-filled ones above the concentrations range of 5 phr in the composites.

• Food Science and Preservation
• /
• v.11 no.1
• /
• pp.57-62
• /
• 2004

Pesticide contaminants content was determined about both general vegetables marketed at Garak-dong market and organic vegetables cultivated at Hongchun, Kangwon-do. The vegetables were kale, Angelica Keiskei Koidz, celery, lettuce and Allium fistulosum. Pesticide contaminants content of 5 kinds general vegetables were 93.5, 57.7, 112.4, 76.5, 65.2 ppm, respectively. This residual levels were showed 75.35, 70.68, 78.49, 70.49％ about standard level, respectively. Angelica Keiskei Koidz was not able to calculate the residual level because the standard level was not established in Korea. In contrast, the residual levels of organic vegetables were determined 36.4, 21.0, 42.9, 29.1, 25.1ppm, respectively. This level was about 30％ of standard level, 38.93, 36.40, 38.17, 38.04, 38.50％ of general vegetables. At the result, pesticide contaminants content of organic vegetables was less than 40％ of general vegetables.

• Korean Journal of Food Science and Technology
• /
• v.53 no.6
• /
• pp.701-705
• /
• 2021

Although the breed protection rights of Jangsaemi garlic were registered in 2012, the cultivation area was not large and no related papers were found, so this study was conducted. Potassium was the highest inorganic content of Jangsaemi garlic, followed by nitrogen, sulfur, and phosphorus. Allin and allicin were also present at 9.73±0.97 and 1.65±0.15 mg/g, respectively. The solid content was 7.90±0.00°Bx, and the reducing sugar was 33.42±1.79 mg GE/g. The total phenol and flavonoid contents were 80.35±2.67 mg GAE/100 g and 33.80±2.17 mg QE/100 g, respectively. The antibacterial activity of Jangsaemi garlic was higher in gram-positive bacteria than in gram-negative bacteria, especially Staphylococcus epidermidis and Micrococcus luteus. The results of these studies are expected to provide useful information for farmers growing Jangsaemi garlic in the future.

• Korean Journal of Soil Science and Fertilizer
• /
• v.32 no.1
• /
• pp.22-30
• /
• 1999

This experiment was carried out to determine the forage yield and mineral contents of silage corn(Zea mays L.), and N balance, soil chemical characteristics and nitrate-N level in infiltration water by different types and N rates of liquid manure applied. Seven treatments consisting of chemical fertilizer $200kg\;N;ha^{-1}$, liquid cattle manure 200, 320 and $440kg\;N;ha^{-1}$, liquid swine manure 200, 320 and $440kg\;N;ha^{-1}$ were arranged in a randomized complete block design with three replications. The results obtained at National Livestock Research Institute, RDA, in Suweon from May 1997 to Aug. 1997 are summarized as follows : There were no significant differences in percentage of dry matter among the treatments, but significant dry matter yield differences were found (P<0.05), and also the mean dry matter yield of liquid swine manure plot was higher than that of liquid cattle manure plot. Potassium, calcium and magnesium contents of silage corn increased with increasing liquid manure application rates (P<0.05). Nitrate-N content of silage corn in the liquid cattle manure treatments was not influenced by liquid manure application rates, but that in the liquid swine manure treatments increased with increasing the N rates of liquid manure application. pH and contents of exchangeable canons of the soil after experiment were raised by increasing the amount of liquid manure application. Available $P_2O_5$ content in topsoil(0-10cm) was highest as $340mg\;kg^{-1}$ at the plot of liquid swine manure $440kg\;N;ha^{-1}$. Concentration of nitrate-N in infiltration water increased at the plot of liquid swine manure $440kg\;N;ha^{-1}$. Amount of nitrogen balance increased with increasing liquid manure application rates. Based on the results of this experiment, it is suggested that the mean dry matter yield of liquid swine manure plot was higher than that of liquid cattle manure plot, and the amount of nitrogen balance increased with increasing liquid manure application.

• The Korean Journal of Food And Nutrition
• /
• v.24 no.3
• /
• pp.367-375
• /
• 2011

For this study, Korean-type Koumiss was made by the fermentation of mixed cultures, in which yeast, Kuyveromyces, and microflora, Streptococcus thermophiles and Lactobacillus bulgaricus, were inoculated into 10% skimmed milk with added whey powder(control: A, 2%: B, 4%: C, 6%: D, and 8%: E). Fat, protein, lactose, titratable acidity, pH, the number of lactic acid bacteria, the number of yeast, alcohol content, volatile fatty acids, volatile free amino acids and minerals were measured in the products. The results were as follows: As the dosage of whey powder increased, fat increased from 0.74% in the control to 2.30% in sample E, protein increased from 2.95% in the control to 4.39% in sample E and lactose increased from 3.10% in the control to 7.43% in sample E. Titratable acidity and pH increased gradually. The number of lactic acid bacteria increased from $10^9\;cfu/m{\ell}$ in the control to $3.8{\times}10^9\;cfu/m{\ell}$ in sample E, and the number of yeast increased from $6.1{\times}10^7\;cfu/m{\ell}$ in the control to $1.65{\times}10^8\;cfu/m{\ell}$ in sample E, according to the increase of whey powder content. For alcohol content, the average values were 0.863%, 0.967%, 0.890%, 1.290%, and 1.313% for the control and samples B, C, D, and E, respectively. As the dosage of whey powder increased, alcohol content showed a tendency to gradually increase. The average alcohol content of E was 1.313 and this was higher than the alcohol content of Kazahstana-type Koumiss with 1.08%. Sixteen types of free amino acids were detected. Glycine was the lowest in the control at $0.38mg/m{\ell}$ and sample E contained $0.64mg/m{\ell}$. Histidine was also low in the control at $0.42mg/m{\ell}$ and sample E contained $0.65mg/m{\ell}$. On the other hand, glutamic acid was highest at $4.13mg/m{\ell}$ in the control whereas sample E had $6.96mg/m{\ell}$. Proline was also high in the control at $1.71mg/m{\ell}$ in control, but E contained $2.80mg/m{\ell}$. Aspartic acid and leucine were greater in sample E than in the control. For volatile free fatty acids, content generally had a tendency to increase in the control, and samples B, C, D, and E. Content of acetic acid gradually increased from $12,661{\mu}g/100m{\ell}$ in the control to $37,140{\mu}g/m{\ell}$ in sample E. Butyric acid was not detected in the control and was measured as $1,950{\mu}g/100m{\ell}$ in sample E. Caproic acid content was $177{\mu}g/100m{\ell}$ in the control and $812{\mu}g/100m{\ell}$ in sample E, and it increased according to the increase of whey powder content. Valeric acid was measured in a small amount in the control as $22{\mu}g/100m{\ell}$, but it was not detected in any other case. Mineral contents of Ca, P, and Mg increased from 1,042.38 ppm, 863.61 ppm, and 101.28 ppm in the control to 1,535.12 ppm, 1,336.71 ppm, and 162.44 ppm in sample E, respectively. Na content was increased from 447.19 ppm in the control to 1,001.57 ppm in sample E. The content of K was increased from 1,266.39 ppm in the control to 2,613.93 ppm in E. Mineral content also increased with whey powder content. In sensory evaluations, the scores increased as whey powder content increased. Flavor was lowest in the control with 6.3 points and highest in E with 8.2 points. Body and texture were highest at 4.2 points in the control, which did not have added whey powder. In the case of appearance, there were no great differences among the samples.

• Journal of Korean Society of Forest Science
• /
• v.78 no.1
• /
• pp.55-60
• /
• 1989

To find the nutritive values of the edible bamboo shoot (Playllostachys edulis) produced in Korea, the component analysis was conducted using the fresh and canned bamboo shoot. As the principal component ; water, protein, lipid, sucrose, ash, cellulose and calorie content were measured in fresh bamboo shoot and canned bamboo shoot. Also the content of minerals ; K, P, Ca, Fe and Vitamins were analysed and compared between fresh and canned bamboo shoot. The contents of component were devided into upper, middle and bottom bamboo parts. The contents of protein, lipid, ash, cellulose and calories of raw bamboo shoot were higher than those of canned shoot. Generally, the components of bamboo shoot produced in Korea were not significantly different to those of Ueda's results in Japan. But the contents of lipid, calcium and potassium were higher in Korean bamboo shoot.

• The Korean Journal of Food And Nutrition
• /
• v.17 no.2
• /
• pp.212-219
• /
• 2004

In this study, we compared that sensory characteristics and nutritional components of ice cream supplements with various levels(1, 2, 3％) raw and frozen citron juice. Vitamin C was not detected in frozen citron juice 1％ added group. The content of vitamin C was 4.7 mg/100g in raw citron juice 3％ added group. But it detected 1.0 mg/100g in 3％ frozen citron juice added group. Free sugars were detected sucrose, lactose and maltose. Those amounts of all samples were lower than control group and were lower goes to citron juice added ratio higher. Organic acids in ice creams were detected oxalic acid, malonic acid, malic acid and citric acid. The citric acid content was higher than other organic acid. Especially, citric acid content was the highest in raw citron juice 3％ added group (6.3 mg/100g). But it's content was low in all frozen citron juice added groups (0.5-0.6 mg/100g). Mineral contents of ice creams were highest in raw citron juice 3％ added group (3399.96 mg/100g). The results of sensory test, citron aroma and citron taste were the highest in raw citron juice 3％ added group. Overall acceptability was the highest in frozen citron juice 2％ added group.