• Title/Summary/Keyword: Free Amino Acid

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Trend and Further Research of Rice Quality Evaluation (쌀의 품질평가 현황과 금후 연구방향)

  • Son, Jong-Rok;Kim, Jae-Hyun;Lee, Jung-Il;Youn, Young-Hwan;Kim, Jae-Kyu;Hwang, Hung-Goo;Moon, Hun-Pal
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.47
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    • pp.33-54
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    • 2002
  • Rice quality is much dependent on the pre-and post harvest management. There are many parameters which influence rice or cooked rice qualitys such as cultivars, climate, soil, harvest time, drying, milling, storage, safety, nutritive value, taste, marketing, eating, cooking conditions, and each nations' food culture. Thus, vice evaluation might not be carried out by only some parameters. Physicochemical evaluation of rice deals with amy-lose content, gelatinizing property, and its relation with taste. The amylose content of good vice in Korea is defined at 17 to 20%. Other parameters considered are as follows; ratio of protein body-1 per total protein amount in relation to taste, and oleic/linoleic acid ratio in relation to storage safety. The rice higher Mg/K ratio is considered as high quality. The optimum value is over 1.5 to 1.6. It was reported that the contents of oligosaccharide, glutamic acid or its derivatives and its proportionalities have high corelation with the taste of rice. Major aromatic compounds in rice have been known as hexanal, acetone, pentanal, butanal, octanal, and heptanal. Recently, it was found that muco-polysaccharides are solubilized during cooking. Cooked rice surface is coated by the muco-polysaccharide. The muco-polysaccharide aye contributing to the consistency and collecting free amino acids and vitamins. Thus, these parameters might be regarded as important items for quality and taste evaluation of rice. Ingredients of rice related with the taste are not confined to the total rice grain. In the internal kernel, starch is main component but nitrogen and mineral compounds are localized at the external kernel. The ingredients related with taste are contained in 91 to 86% part of the outside kernel. For safety that is considered an important evaluation item of rice quality, each residual tolerance limit for agricultural chemicals must be adopted in our country. During drying, rice quality can decline by the reasons of high drying temperature, overdrying, and rapid drying. These result in cracked grain or decolored kernel. Intrinsic enzymes react partially during the rice storage. Because of these enzymes, starch, lipid, or protein can be slowly degraded, resulting in the decline of appearance quality, occurrence of aging aroma, and increased hardness of cooked rice. Milling conditions concerned with quality are paddy quality, milling method, and milling machines. To produce high quality rice, head rice must contain over three fourths of the normal rice kernels, and broken, damaged, colored, and immature kernels must be eliminated. In addition to milling equipment, color sorter and length grader must be installed for the production of such rice. Head rice was examined using the 45 brand rices circulating in Korea, Japan, America, Australia, and China. It was found that the head rice rate of brand rice in our country was approximately 57.4% and 80-86% in foreign countries. In order to develop a rice quality evaluation system, evaluation of technics must be further developed : more detailed measure of qualities, search for taste-related components, creation and grade classification of quality evaluation factors at each management stage of treatment after harvest, evaluation of rice as food material as well as for rice cooking, and method development for simple evaluation and establishment of equation for palatability. On policy concerns, the following must be conducted : development of price discrimination in conformity to rice cultivar and grade under the basis of quality evaluation method, fixation of head rice branding, and introduction of low temperature circulation.

숙성 토하젓의 기능성분 및 토하젓 소스 개발에 관한 연구

  • 박복희
    • Proceedings of the SOHE Conference
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    • 1997.12a
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    • pp.39-43
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    • 1997
  • Toha-jeod was manufactured by seven methods ; low salt group (L:15% sodium chloride), high salt g group (H:23% sodium chloride), 50% conventional soybean sauce group (S), low salt group containing 2% w wheat bran (W2%-L), high saIt group containing 2% wheat bran (W2%-H),high salt group containing 2% wheat bran (W2%-H), high salt group containing 4% wheat bran (W4%-H). After these seven groups were refrigerated at $4{\pm}1^{\circ}C$, they were sampled at intervals of three months and analyzed functional components. The free amino acid in Toha-jeod which are omitine, glutamic acid, leucine, alanine, lysine and valine increased gradually up to six months of fermentation and decreased by nine months. Conventional soybean sauce group increased continuously during the fermentation process. Hypoxanthine was altered almost among other nueletides. ATP was not detected, IMP and inosine had disapapted after the six months fermentation. Polyene fatty acids and n-3 fatty acids were decreased and s saturated fatty acids were not altered in the group containing wheat bran during fermentation. In the Hunter values, the group containing wheat bran and high salt group showed lower level than the group n not containing wheat bran and low salt group. Redness indicating the value of Toha-jeod increased as Toha-jeod was fermentated. Low salt group and conventional soybean sauce group were superior to other groups in the extent of redness. As the fermentation of Toha-jeod progressed for a long time, molecular weight distribution tended to become less molecular and the formation of chitin oligosaccharides was increased significantly. After nine months of fermentation, 24.75% chitin oligosaccharides [($GlcNAd_4$ ~ ($GlcNAd_8$, M.W. 823~1789] were created in the high salt group containing 2% wheat bran. [($GlcNAd_6$. M.W. 1236J , that is NACOS-6, which was reported as an antitumor activity material, was present in 4.01~4.37% of total Toha chitin content. 66.30% chitin oligosaccharides were created in conventional soybean sauce.

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Physicochemical Composition and Fermentation Conditions of Sliced, Dried Radish Kimchi with Flying Fish Roe (날치알을 첨가한 무말랭이 김치의 이화학적 성분 및 발효양상)

  • Jang, Mi-Soon;Park, Hee-Yeon;Nam, Ki-Ho;Kim, Min Jeong
    • Korean Journal of Food Science and Technology
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    • v.46 no.5
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    • pp.566-574
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    • 2014
  • This study was conducted to compare the physicochemical composition and fermentation conditions of sliced, dried radish kimchi with flying fish roe (DFFR). The levels of crude protein, crude lipid, and crude ash in DFFR were higher than those in sliced, dried radish kimchi without flying fish roe (control). DFFR also contained higher levels of Fe and Ca, compared to the control. The inosine monophosphate (IMP) content of DFFR and control was 5.63 and 2.64 mg/100 g, respectively. The polyunsaturated fatty acid and DHA contents in DFFR were approximately 5 and 23 times higher than those in the control, respectively. The major free amino acids contained in these samples were arginine, proline, alanine, leucine, and valine. The number of cells belonging to the Leuconostoc species in DFFR was higher than that in the control. In sensory evaluation studies, DFFR scored the highest in terms of appearance, flavor, taste, and texture.

Effects of High Temperature Sterilization on Qualities Characteristics of the Canned Boiled Oyster (가열살균처리가 굴 보일드통조림의 품질특성에 미치는 영향)

  • Kong, Chung-Sik;Yun, Jae-Ung;Oh, Dong-Hun;Park, Jun-Yong;Kang, Jin-Yeong;Oh, Kwang-Soo
    • Journal of agriculture & life science
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    • v.43 no.6
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    • pp.85-93
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    • 2009
  • The boiled oyster vacuum-packed in cylindrical can(No. 301-3) were thermally processed at $115^{\circ}C$ to reach Fo values of 5~20 min. The yield was slightly decreased with the increasing of Fo-values (79.2~ 83.7%), and volatile basic nitrogen (VBN) contents increased markedly with the increasing of Fo-value. In fatty acid composition of canned oyster, the composition ratio of saturates and monoenes such as 14:0, 16:0 and 18:1n9 increased, while polyunsaturated fatty acids such as 20:5n-3 and 22:6n-3 decreased with the increasing of Fo-value. In taste compounds, content of total free amino acid in raw oyster was 1,533.5 mg%, and this total content was slightly increased (1,140.8~1,266.2 mg%) with the increasing of Fo values. But contents of betaine and ionic minerals such as Na, K, Mg and P decreased markedly by thermal processing at $115^{\circ}C$. As compared with Fo 5 min. heat treatment; Fo 20 min. heat treatment at $115^{\circ}C$ became more hardened in texture of oyster meat. In sensory evaluations on organoleptic characteristics, no significant difference at 5% level was observed among the canned boiled oyster meats heated at Fo 5~15 min.

Fermentation characteristics of yakju containing different amounts of steam-cooked Jerusalem artichoke (Helianthus tuberosus L.) (돼지감자(Helianthus tuberosus L.)의 첨가량과 증자처리에 따른 약주 발효 특성)

  • Jun-Su Choi;Kyu-Taek Choi;Chan-Woo Kim;Heui-Dong Park;Sae-Byuk Lee
    • Food Science and Preservation
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    • v.30 no.1
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    • pp.155-169
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    • 2023
  • Jerusalem artichoke (JA, Helianthus tuberosus L.) has a great potential to enhance the quality of yakju due to the plentiful inulin content which is functional and indigestible carbohydrate in human. In this study, the optimal preparation conditions such as the added amount and steam treatment of JA were investigated to improve the quality of yakju. As the amount of JA added to yakju increased, alcohol production decreased, whereas fermentation was performed well when the steam-cooked JA was added to yakju. The pH and total acidity of yakju decreased and increased, respectively, when the amount of JA added to yakju increased, whereas pH and total acidity of yakju increased and decreased, respectively, when the steam-cooked JA was added to yakju. The free sugar and organic acid contents of yakju increased and decreased, respectively, when the amount of JA added to yakju increased, whereas those of yakju decreased when the steam-cooked JA was added to Yakju. Amino acid content of JA decreased as the amount of JA added to yakju increased and that of JA significantly decreased when the steam-cooked JA was added to yakju. In the sensory evaluation analysis, the addition of 10% unsteam-cooked JA to yakju was the best when considering sweetness, flavor, sourness, and overall preference of yakju supplemented with JA. Consequently, utilizing JA to yakju may contribute to the improvement of the quality of yakju.

The Changes of Texture and some Chemical Components of Atka-fish by Various Baking Methods (구이방법에 따른 임연수어 Texture 및 성분변화)

  • 조순옥;조신호;이효지
    • Korean journal of food and cookery science
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    • v.1 no.1
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    • pp.74-81
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    • 1985
  • For this research, the Atka-fisher which are used commonly in many homes for baking and broilling were broiled by an iron baking method, a pan baking method, a grill baking method and a microwave baking method respectively after 20 hours salting with 3% salt concentration of fish muscle weight. This thesis has an intention of appreciating the tastes according to each baking method through a sensory test, of examining the corelation between the change of texture measured by Rheometer and a sensory test and of comparing the changes of chemical component of the fish. The results were as follow: 1. The appearance of the broiled Atka-fish maintained a good appearance by the iron baking method and the grill baking method. In the color, the iron baking method and the grill baking method by direct :fire resulted a good score too. In the flavor, there was a significant difference between the grill baking method and the microwave baking method while there was no difference between the iron baking method and the pan baking method. The result of tenderness showed that the pan baking method has the highest score. Difference between the iron baking method and the pan baking was not significant. There was no difference in tenderness between the grill baking method and the microwave baking method. The iron baking method showed-the highest score in juciness and the microwave baking method stowed the highest score in acceptability however the differences were not significant. 2. As a result of the measurement of the texture by Rheometer, the iron baking method and the grill baking method showed higher score than other methods in hardness and chewiness. In springiness and cohesiveness, there was no significant difference among methods. As a result of the measurement of the texture by Rheometer, the corelation with a sensory test was considered to be low. 3. After broil, the cooking retention was the highest in the pan baking method and the moisture content was the highest in microwave baking method. Nitrogen content was the highest in the iron baking method. Fat content was the highest in the iron baking method, followed by the grill baking method, the pan baking method, and the microwave baking method. Free amino acid content was the highest in the iron baking method, followed by the grill baking method, the pan baking method and the micro-wave baking method.

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Nutritional Properties of ChOl-PyOn Preparation by Adding Mugwort and Pine leaves (쑥과 솔잎을 첨가한 절편의 영양학적 특성)

  • 김종군
    • Korean journal of food and cookery science
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    • v.11 no.5
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    • pp.446-455
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    • 1995
  • The nutritional properties of the Chol-Pyon were investigated with changing the materials (mugwort and pine leaves). In proximate composition, rice powder added mugwort and pine leaves showed the lligher con-tents of crude protein, crude lipid and crude ash than in rice powder. Ihe pH of rice powder, mugwort and pine leaves was 6.4, 6.8 and 3.5, respectively. The rice powder added pine leaves showed the lowest pH value. The content of the free sugar in raw materials for ChOl-PyOn preparation was 0.9% in rice powder, 0.3% in mugwort and 2.7% in pine leaves. Eighteen kinds of amino acids were determined in raw materials for ChOl-fyOn preparation and their contents were 4.8% in mugwort, 4.2% in rice powder and 2.8% in pine leaves. The major minerals of raw materials for ChOl-PyOn preparation was 0.9% increased in the order of K> Na > Mg > Ca in rice powder, Mg > K > Ca > Na in mugwort, and K > Ca > Mg > Na in pine leaves. Both of mugwort and pine leaves additives showed the higher contents of 8 kinds of minerals (Ca, Mg, K, Na, Mn, Fe, Cu, Zn) than in rice powder. In relation to changes in the texture of ChOl-PyOn, hardness, fracturability and adhesiveness at 25${\pm}$1$^{\circ}C$ were measured to be highest in white ChOl-PyOn. Cohesiveness was shown to be highest at 15% in case of mugwort and 2.5% in case of pine leaves. Elasticity was measured to be highest at 0.99 in case that 7.5% mugwort was added to raw materials for ChOl-PyOn. As a result of estimating the sensory qualities of the ChOl-PyOn prepared to which the additives were added in differing amounts, immediately after its preparation the mugwort additive of 7.5% showed the superior sensory qualities Chol-PyOn (p < 0,01).

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Storage Properties and Biogenic Amines Production of Makgeolli Brewed with Different Proportions of Rice and Wheat Flour (쌀과 밀가루 배합비율을 달리하여 담근 막걸리 저장 중의 품질 특성 및 Biogenic Amine 함량 변화)

  • Kim, Soon Mi;Han, Ara
    • Korean Journal of Food Science and Technology
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    • v.44 no.5
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    • pp.583-591
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    • 2012
  • Four kinds of makgeolli brewed with different proportions of rice and wheat flour were prepared to investigate the effects of the carbohydrates source on the storage properties, and to examine the chemical characteristics and BA (biogenic amine) contents in makgeolli stored over 30 days at 4, 10 and $20^{\circ}C$, respectively. The chemical properties and BA contents were sustained at a consistent level for those makgeolli stored at $4^{\circ}C$ over 30 days. The alcohol content was significantly higher for makgeolli brewed with higher proportions of rice (R) over wheat flour (WF) (R 100: WF 0, R 70: WF 30) when compared with those brewed with a high proportion of wheat flour (R 30: WF 70, R 0: WF 100), and increased with increasing storage temperature and duration. The free amino acid contents of makgeolli brewed with high proportion of rice were significantly lower under the same conditions. Among the 8 BAs examined, tyramine, putrescine, cadaverine and phenylethylamine were detected, while tyramine and putrescine were mainly detected. Histamine was not detected throughout storage. Makgeolli brewed with rice as the only carbohydrate source exhibited very low levels of total BA during 30 days of storing at $20^{\circ}C$. Total BA contents of R100, R70, R30, R0 were 178.6, 682.9, 1186.7 and 1150.4 mg/L, respectively. These results suggest that makgeolli brewed with relatively higher proportions of rice have better storage properties and are safer for consumption.

Effects of Organic Matter Applications on General Components and Essential Oils in Codonopsis lanceolata $T_{RAUTV}$ (유기물(有機物) 종류(種類)에 따른 더덕 근(根)의 일반성분(一般成分)과 정유성분(精油成分) 변화(變化))

  • Lee, Seong-Phil;Kim, Sang-Kuk;Choi, Boo-Sull;Lee, Sang-Chul;Yeo, Soo-Kab
    • Korean Journal of Medicinal Crop Science
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    • v.6 no.1
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    • pp.21-27
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    • 1998
  • This experiment was conducted to increase aromatics in roots of Condonopsis lanceolata by applications of organic matters. Fresh root wt. was increased by conifer/moss application to 79.1g per plant. Crude protein content was also higher at rice straw application than native soil application and crude saponin content was increased by conifer/moss application, but contents of crude fat, fiber and ash were not different in all treatments. Although contents of K, Ca, and Mg were increased by rice straw application, Fe, Mn, Zn, Na and Cu were not significantly different in all treatments, The highest free amino acid was arginine, it was increased by the application of fallen leaves and the highest yield (0,008%) of essential oils was obtained by conifer/moss application. As a result, to produce C. lanceolata plant showing higher quality and aromatic essential oils, it was considered that the most effective organic matter showing high yield and higher aromatic constituents was conifer/moss application of over 3M/T per 10a.

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Physicochemical Characteristics of Seafood-Added Kimchi during Fermentation and Its Sensory Properties (수산물 첨가 김치의 이화학적 특성 변화 및 관능성)

  • Woo, Minji;Choi, Jung Ran;Kim, Mijeong;Jang, Mi-Soon;Cho, Eun Ju;Song, Yeong Ok
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.41 no.12
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    • pp.1771-1777
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    • 2012
  • This study was conducted to investigate the physicochemical characteristics of seafood added kimchi (SAK) during fermentation and its sensory properties. Korean cabbage kimchi (KCK) and four different SAKs were prepared and stored at $5^{\circ}C$ for eight weeks. The SAKs contained pre-treated octopus, squid, abalone, and webfoot octopus added at 12% (w/w) to the brined Korean cabbage. The fermentation patterns of SAKs were similar to those of KCK, indicating that the SAKs followed a typical fermentation process. Comparison of the physicochemical characteristics of SAKs with KCK revealed that the pH and acidity of SAKs was higher. The maximum concentrations of Lactobacillus spp. and Leuconostoc spp. for SAKs ranged from 8.31~8.85 and 7.60~8.14 log CFU/mL, respectively, which were higher than those for KCK. Therefore, the production of organic acids by microorganisms was greater in SAKs, which explained the higher acidities of the SAKs. Nitrogenous compounds hydrolyzed during fermentation, as well as reducing sugars and other nutritious compounds in SAKs might provide a good medium for lactic acid bacterial growth. Sensory evaluation was carried out using optimally ripened kimchi (pH $4.3{\pm}0.1$, acidity $0.7{\pm}0.1$), and the scores for sour taste, sour smell, and carbonated taste were significantly lower for SAKs than KCK. In the preference test, texture and overall acceptability were significantly higher for SAKs than KCK. Significant differences were not observed among SAKs upon subjective and preference evaluations. In conclusion, the fermentation patterns of SAKs were normal, regardless of seafood sources, and their sensory characteristics were comparable to or superior than those of KCK due to free amino acids, nitrogenous compounds produced during the fermentation, and reducing sugar present in the seafood.