• 한국식품과학회지
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• 제29권6호
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• pp.1151-1157
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• 1997

정제된 다당류 메틸란을 여러 가지 화학 방법에 의해서 분석한 결과 79%의 당이 존재하였고 6%의 단백질과 16%의 유기산이 존재하였다. 배양시간이 증가함 따라 pyruvic acid와 uronic acid 같은 산의 함량이 34시간의 10%에서 72시간에서는 17%까지 증가하였고 이에 따라 점도도 증가하였다 메틸란 내의 산의 함량이 점도에 중요한 인자로 생각되어 주요 유기산인 uronic acid와 pyruvic acid의 함량과 점도와의 관계를 살펴보았다. 생물학적 및 과학적 변형을 통하여 pyruvic acid의 함량이 변화된 메틸란을 이용하여 pyruvic acid의 함량과 점도와 관계를 조사하였다. Pyruvic acid함량이 증가할수록 겉보기 점도와 고유 점도가 증가하였고 pyruvic acid의 함량이 1% 증가할 경우 약 290 cp의 겉보기 점도와 약 6 dL/g의 고유 점도가 증가하였다. 생물학적 및 화학적 변형을 통하여 uronic acid의 함량이 변화된 다당류에서 uronic acid 함량과 점도와 관세를 살펴보았다. 메틸란 내의 uronic acid의 함량이 증가할수록 점도가 증가하여 uronic acid의 함량이 1% 증가할 경우 약 85 cp의 겉보기 점도와 약 1.5 dL/g의 고유 점도가 증가하였다. 이러한 결과로부터 메틸란의 점도 증가는 다당류 내의 유기산의 함량이 증가할수록 증가되고 메밀란의 점도 증가는 uronic acid보다 pyruvic acid에 더 기인함을 알 수 있었다.

• 동아시아식생활학회지
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• 제4권3호
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• pp.103-109
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• 1994

Changes in taste components of Backilju, an traditional alcoholic beverage of Korea, were investigated. Ethanol(17%) was the most abundant, and then isoamylalcohol(23mg%) and methanol(8mg%) were also detected in a small amount in Backilju. Major non-volatile organic acids were lactic and malic acid, followed by citric, fumaric and succinic acid. Arginine, phenylalanine and glutamic acid were major free amino acids and essential amino acid content was 230∼560 mg%, which was 45∼48% of total free amino acids. The major fatty acid of total lipid was palmitic acid(37∼43%). It has been found that the Backilju contained more free amino acids and alcohols than other Korean Yokjus.

• 한국식품조리과학회지
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• 제4권1호
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• pp.53-57
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• 1988

국산차 기술개발을 위한 기초 자료를 얻고자 국내산 및 스리랑카제품의 특성에 대하여 분석한 결과는 다음과 같다. 1. 국산 홍차는 스리랑카 홍차에 비하여 섬유함량이 50% 높은 반면 탄닌 및 카페인함량은 크게 낮았다. 탄닌의 경우 3.5배, 카페인함량은 50%의 차이를 나타내었다. 또한 회분, 조지방, 조단백질의 함량은 두 제품간에는 큰 차이가 없었다. 2. 스리랑카 홍차에서는 P 3,000ppm, K 15,000ppm, Mg 1,400ppm, Ca 4,000ppm, Cu 22ppm, Cr 21ppm 및 Zn 45ppm으로 국산 홍차보다 높은 함량이었으며, 국산홍차에서는 F 225ppm, Mn 1,950ppm, Fe 265ppm, Sr 6ppm 및 Al 4,100ppm으로 스리랑카 홍차보다 높은 함량이었다. Pb와 Cd는 양 제품에서 검출되지 않았다. 3. 국산 홍차에서는 6종류의 유기산이 분리·동정되었는데 quinic acid와 gallic acid의 함량이 높았다. 스리랑카 홍차에서는 8종류의 유기산이 동정되었으며 shikimic acid, citric acid 및 quinic acid가 주요 유기산이었다. 4. Sucrose의 함량은 스리랑카 홍차보다 국산 홍차가 2.5배 높았다. 5. 홍차의 특수성분인 theaflavin, thearubigin, theobromine의 함량은 스리랑카 홍차에서 높은 경향을 나타내었다.

• 한국식품영양과학회지
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• 제20권1호
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• pp.52-58
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• 1991

Physico-chemical properties including the composition of organic acids and fatty acids in native bee-honey and foreign bee-honey harvested in Kangwon area were studied with the emphasis on the honey which was collected form wild flowers nd mixed flowers sources for honey nectars. the major organic acids were considered as acetic acid formic acid and valeric acid in volatile acids and gluconic acid maleic acid malic acid quinic acid and citric acid in non-volatile fraction in both of native bee-honey and foreigr bee-honey. Some naturally occuring fatty acids({{{{ { C}_14{ } }}}}-{{{{ {C }_{20 } }}}}) were observed with the principal fatty acids of myristic aicd linolenic acid and palmitic acid and palmitic acid in the various honey, The characteristics of moisture content pH viscosity free acidity lactone and total acidity were also analyzed and discussed.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2000년도 제31회 춘계학술대회
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• pp.99-105
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• 2000

Greases composed of base oil and thickener are widely used in the purpose of lubrication and anti-corrosion of machinery. However, greases are sometimes oxidized and decomposed by heat of friction, and produced organic acid. And the greases leaked out ordinary spot make the concrete structures weaken. In this study, the chemical effects of the greases with the concrete structures were investigated through oxidation reaction under pressure and oxygen, and evaluated by the analysis of TAN, Ca content, FT-IR and XRD of grease and cement powder after the oxidation reaction. As the results, TAN value decreased with the increase of the content of cement because of neutralization of organic acid produced by the oxidation of grease with calcium contained in the cement. The content of calcium linearly increased with the increase of cement due to calcium salt by neutralization of acid. Also, according to XRD results of the cement powder oxidized at 99 $^{\circ}C$, the diffraction peak due to calcium hydroxide decreased in comparison with that at room temperature because of the reaction of calcium and organic acid.

• 한국식품영양학회지
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• 제13권5호
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• pp.440-445
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• 2000

단감재배농가에서 전량 폐기되는 적과단감을 이용한 가공식품을 개발하기 위한 기초자료를 얻고자 일반성분, 유리당, 유기산, 무기질 및 비타민 등을 분석하였다. 일반성분은 수분이 89.08%로 대부분을 차지하였으며 회분이 0.26%, 조지방이 0.56%, 조단백질이 0.75%이었다. 유리당은 glucose와 fructose가 각각 3.34%, 3.01%로 대부분을 차지하였으며 sucrose는 미량 검출되었다. 유기산은 citric acid, maleic acid, fumalic acid, lactic acid 등이 검출되었으며 그 중 lactic acid가 68.65mg%로 전체 유기산 함량의 79%를 차지하였다. 무기질은 K, P, Na. Ca, Fe, Zn 등이 검출되었으며 그 중 K이 126.l2mg%로 대부분을 차지하였으며 Fe과 Zn은 미량 검출되었다. 비타민 A는 33.95 R.E.로 완숙단감보다 함량이 적었으며 비타민 C는 171.01mg%로 완숙단감에 비해 10배 이상 함유하였으며 비타민 B$_1$과 B$_2$는 소량 검출되었다.

• 한국유기농업학회지
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• 제28권3호
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• pp.367-386
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• 2020

The significance of this study was to analyze the quality value of organic livestock pork for the first time based on the results of managing and testing the cycling organic farming of black pork and vegetables within farm for two years. The results of analysis could be summarized as follows. First, the pork of experimental group with crop-livestock cycling farming showed the excellent quality and high consumer preference compared to the control group of general pork or pork from non-crop-livestock cycling organic farming. In the content ratio of Omega-3 as a representative essential fatty acid, it was 1.46 that was about 2.8 times more than general pork (0.52). In case of Omega-6, it had about 2.5 times more than general pork. Especially, the U/S ratio value which was the content ratio of Unsaturated Fatty Acid (UFA, U) of Saturated Fatty Acid (SFA, S), was largely shown in pork (2.93) from cycling organic farming. Second, it would be necessary to maintain the economies of scope shown in crop-livestock cycling organic farming, and the high quality value of livestock products. For this, there should be a value chain model that could realize the economies of scope and economies of scale at the same time based on scaling and diversification through cooperative organization between farmers. Through this, it would be possible to establish a cycling model called 'community cooperative agriculture' by forming local internal markets through cooperation of production-processing and integration of distribution-sale-consumption. For the managerial activation of this cooperative organization, the government should promote/support the small crop-livestock cycling organic farming cooperative organization in local unit. For securing the reliability of crop-livestock cycling organic agricultural products and crop-livestock cycling organic livestock products, it would be necessary to review the introduction of Participatory Guarantee System (PGS).

• 한국식품영양과학회지
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• 제25권4호
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• pp.654-658
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• 1996

제호탕의 유기산 함량은 formic acid 739.Snm(0.07%), lactic acid 2162.1ppm(0.22%), acetic acid 3204ppm(0.32%), citric acid 31763.7ppm(3.2%)이었으며 가장 특이한 것은 citric acid가 3.2%를 함유하는 것으로 나타나 제호탕의 신맛에 근원인 것으로 생각되었다. GC/MSD사용하여 확인된 제호탕의 향기성 분은 39종으로 이들의 구성 성분을 분류하면 hydrocarbon류(30.81%) 17종, adehyde류(7.18 %) 1종, ketone류(4.79%) 2종, terpene류(25.96%) 8종, acid류(16%) 4종, alcohol류(5.42%) 2종, phenol류(2.76%) 2종, 그리고 기타 향기(7.68%) 3종이었다. 이 결과로 볼 때 hydrocarbon류, terpene류, acid류가 전체 향기성분의 70%이상을 차지하여 이들이 제호탕의 특유한 향기성분이었다. 제호탕의 색소 추출액은 200~400nm에서 최대 홉수파장을 나타내어 황색~적색 계통의 여러가지 색소가 혼합되어 있음을 알 수 있었다.

• 한국식품영양과학회지
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• 제23권6호
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• pp.950-953
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• 1994

This study was carried out to investigate the proximate composition , free sugars,amino acids, organic acid, minerals and extracted color of the fruit of paper mulberry (Broussonetia Kazinoki Siebold) . the proximate compositins were 6.1% of moisture, 15.9% of crude protein, 28.5% of crude fat, 8.9% of crude ash and 40.6% of carbohydrates in the fruit of paper mulberry. Free sugars showed low content as 0.1% of glucose , 0.1% of sucrose, 0.1% of fructose and 0.01% of sorbitol, respectively. In amino acid composition of the fruit of paper mulberry, glycine was the highest in the content, followed by methionine, aspartic acid and alanine, The ratio of essential /total mino acids was 0.43 . The richestmineral contained in the fruit of paper mulberry was Ca and followed by K and Mg. Optical density (490-500nm) of the extracted color with 50% ehtanol and 80 % ethanol were 0.75 and 0.30 , respectively.

• 한국작물학회지
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• 제44권2호
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• pp.163-165
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• 1999

The study was conducted to find the critical concentrations of zinc toxicity and to determine the changes of the contents of free proline and organic acids with treatment of different zinc chloride concentrations during rice germination and seedlings grown for seven days. The concentration of zinc chloride, 140 ppm, inhibited root elongation as much as 46 times compared with the control, and the germination rate was also decreased in all treatments of zinc chloride, showing that the germination rate decreased more with increasing concentrations of zinc chloride. Its rate was only 13% with treatment of 140 ppm zinc chloride. The content of free proline with treatment of zinc chloride, 140 ppm, was highest about 4,873 $\mu$M at 3 days compared with the control. Malic acid concentration with treatment of zinc chloride, 140 ppm, increased to approximately 4 times compared to the control. Citric and succinic acid content were also slightly increased in all treatments of zinc chloride.