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The Effects of Calcinated Calcium Solution Washing and Heat Treatment on the Storage Quality and Microbial Growth of Fresh-cut Broccoli (신선편이 브로콜리의 품질과 미생물 성장에 영향을 주는 소성칼슘 용액 세척 및 열처리 효과)

  • Kim, Ji Gang;Nimitkeatkai, Hataitip;Choi, Ji Woen;Lee, Sang Gyu
    • Journal of Bio-Environment Control
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    • v.21 no.4
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    • pp.411-418
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    • 2012
  • This study was conducted to investigate the effect of calcinated calcium (CC) alone or combination with heat treatment on storage quality and microbial growth in fresh-cut broccoli. Fresh broccoli samples were cut into small pieces and washed in normal tap water (TW), $50{\mu}L{\cdot}L^{-1}$ chlorinated water (pH 6.5), $1.5g{\cdot}L^{-1}$ CC, heat treatment in TW at $45^{\circ}C$, and CC dissolved in TW at $45^{\circ}C$ for 2 minutes separately. Samples were then packaged in $50{\mu}m$ polyethylene bags and stored at $5^{\circ}C$. Results revealed that like $50{\mu}L{\cdot}L^{-1}$ chlorine, washing in CC at normal water temperature was effective in reducing microbial population in fresh-cut broccoli samples. Washing with CC combined with heat treatment increased an electrical conductivity of fresh-cut broccoli. Combined heat treatments with TW and CC reduced aerobic plate count on fresh-cut broccoli, only in initial period of storage. But, later on heat treatment induced injury of fresh-cut broccoli resulting more microbial population compared to non heat treatment. However, samples treated with CC alone had good quality with low off-odor at the end of storage. Results suggest that CC, an environment-friendly sanitizer could be an alternative to chlorinated water for washing of fresh-cut broccoli without affecting sensorial quality.

Variation in Quality and Preference of Sogokju (Korean Traditional Rice Wine) from Waxy Rice Varieties (찰벼 품종에 따른 소곡주의 품질 및 기호도 변이)

  • Chun, A-Reum;Kim, Dae-Jung;Yoon, Mi-Ra;Oh, Sea-Kwan;Hong, Ha-Cheol;Choi, Im-Soo;Woo, Koan-Sik;Kim, Kee-Jong;Ju, Seong-Cheol
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.55 no.2
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    • pp.177-186
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    • 2010
  • This study was carried out to compare the physicochemical characteristics and preference as a sensory quality of Sogokju (Korean traditional rice wine) from waxy rice varieties. The protein and moisture contents of milled waxy rice varieties were ranged 6.9~7.2% and 12.1~ 12.6%, respectively. Nunbora had the largest grain size. In pasting properties, Hangangchalbyeo had the highest peak, trough and final viscosities, and Dongjinchalbyeo had the lowest viscosity curve. These differences suppose to be caused by the amylopectin(AP) structure: Dongjinchalbyeo has the largest short AP chains (degree of polymerization (DP) 6-12) and the smallest middle AP chains (DP 13-24) in 9 waxy rice varieties, while Hangangchalbyeo has the smallest short AP chains and the largest middle AP chains. The alcohol contents of Sogokju brewed from 9 waxy rice varieties were 17.6~19.9%. The brix degree were ranged $20.5{\sim}23.9^{\circ}Bx$. The organic acid of Sogokju consisted mainly of succinic acid, and the free sugar of it consisted mostly of glucose. The sensory evaluation showed the highest palatability at the Sogokju from Baegseolchalbyeo. The palatability was positively correlated with the brix degree, the glucose content, and the turbidity, and negatively correlated with the production yield of Sogokju.

The Role of Factors Controlling the Accumulation of Biogenic Amines in Various Cheeses as Milk-Based Products: A Review (낙농유제품인 치즈에 축적된 생체 아민의 다양한 영향 인자에 관한 연구: 총설)

  • Chon, Jung-Whan;Kim, Dong-Hyeon;Kim, Hyun-Sook;Song, Kwang-Young;Lim, Jong-Soo;Choi, Dasom;Kim, Young-Ji;Lee, Soo-Kyung;Seo, Kun-Ho
    • Journal of Dairy Science and Biotechnology
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    • v.32 no.2
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    • pp.77-92
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    • 2014
  • Fermented foods have often been implicated as causative agents in poisoning due to toxic levels of biogenic amines. Cheese, a milk-based fermented food, is the product most likely to contain potentially harmful levels of biogenic amines, such as tyramine, histamine, putrescine, and so on. Recently, the risk awareness of a dietary uptake of high loads of biogenic amines has increased. Hence, we here review the published literature on several factors known to affect the biosynthesis of biogenic amines and their accumulation in milk-based foods. Furthermore, with regard to risk analysis, we discuss the control of factors related to the synthesis and accumulation of biogenic amines as a means to reduce their incidence in milk-based products, and thus to increase food safety.

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Physiological and Ecological Characteristics of the Apple Snails (왕우렁이 (apple snails)의 생리.생태적 특성에 관한 연구)

  • Lee, Sang-Beom;Koh, Mun-Hwan;Na, Young-Eun;Kim, Jin-Ho
    • Korean Journal of Environmental Agriculture
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    • v.21 no.1
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    • pp.50-56
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    • 2002
  • This experiment was carried out to obtain some information about overwintering, physiological and ecological characteristics of apple snails. Another purpose of this experiment was to characterize an appetite for rice plants by apple snails and to elucidate their choice of fresh green ones (vegetables, some other crops, weeds in rice fields). The freshwater snails were found with higher population at sites abundant organic compounds such as plant debris and at regions with high temperature. They also prefer calcium-rich water. This is a naturally occurring process. Apple snails were exceptionally veil-adapted to the south regions of Korea, especially Janghang, Jangseong and Haenam, even if the temperature of winter season is cold below 0$^{\circ}C$. Apple snails were not very selective in their food choice and eat almost everything available in their environment. A snail have something called a radula in its mouth for grinding up its food. A apple snail also chews on fruits and young succulent plant barks. In case of reproduction. apple snails deposit about 157$\sim$784 (average of 321 eggs) milky white to pale orange colored eggs above the waterline. In approximately every 22.4 seconds a new egg appears. The total time needed to deposit a egg mass varies from 58 minutes$\sim$4 hours 13 minutes. Apple snails reproduct actively from May to June and from September to October. An appetite of apple snails for rice plants was the different depending on their size and glowing stage for rice plants. Apple snails had a great appetite of rice plants as well as dropwort, tomato, cabbage, radish, aquatic plants etc. They preferred to eat young rice plants and drastically quit eating rice plants of over 40 cm in height. Thus considering the food preference of apple snail for various plants including rice, they were thought to be a potentially strong predator in fields, especially, at regions with warmer winter.

Development of an Official Analytical Method for Determination of Imazapyr in Agricultural Commodities using HPLC-UVD (HPLC-UVD를 이용한 농산물 중 Imazapyr의 공정분석법 확립)

  • Jang, Jin;Kim, Heejung;Ko, Ah-Young;Lee, Eun-Hyang;Joo, Yoon Ji;Kim, Jinhong;Chang, Moon-Ik;Rhee, Gyu-Seek
    • The Korean Journal of Pesticide Science
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    • v.19 no.1
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    • pp.5-13
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    • 2015
  • A chromatographic method for the determination of imazapyr, a non-selective herbicide, in agricultural commodities was developed to use safety control of pesticide residue on crops, and was fully validated as an official method for residue analysis. Agricultural commodities, mandarin (fruit), hulled rice (cereal grains), pepper (vegetables), potato (potatoes) and soybean (beans) were extracted with methanol and partitioned with dichloromethane to remove the interference obtained from sample extracts, adjusting pH to 2.5 by 4N hydrochloric acid. Finally, they were analyzed by high performance liquid chromatography coupled to UV detector (HPLC-UVD). The developed method had the linearity in the range of test concentrations with coefficients of determination ($r^2$) more than 0.99. Recovery studies were carried out at three concentration levels (LOQ, 10LOQ, and 50LOQ) performing five replicates at each level. Recoveries were ranged between 72.1 to 108.0%, with relative standard deviations less than 10%. A consistent recovery was determined according to the CODEX guidelines (CAC/GL40, 2003). Finally, LC/MS with selected ion monitoring was also applied to confirm the suspected residues of imazapyr in agricultural samples. This developed method for determination of imazapyr residues in agricultural commodities. can be used as an official method.

Development of Yeast-Fermented Animal Feed (연모교발효사요의 제조 및 사양에 관한 연구)

  • 박명삼
    • Microbiology and Biotechnology Letters
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    • v.3 no.3
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    • pp.123-134
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    • 1975
  • Out of 96 yeast strains isolated from various natural habitats, five strains were screened based on their ability to ferment agricultural biproducts such as rice-, barley-and wheat-bran, and sawdust. These were identified as Hansenula anomala var anomala, Candide utilis, C. pelliculosa, Debaryomyces hansenii, and Irpex lacteus. Using these yeasts the above mentioned agricultural biproducts were fermented in various combinations. The fermented product was fed to 180 male Starcroses for eight weeks and obtained a body weight increase of 15.1g a day, while the unfermented control feed increased 10.5g a day.

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Comparison of Hydrochemical Characteristics of Groundwater in the Southern Area and the Northwestern Area, Pusan (부산 남부지역 지하수와 서북부지역 지하수의 수리화학적 특성 비교)

  • 함세영;조명희;성익환;이병대;조병욱;심형수
    • Journal of the Korean Society of Groundwater Environment
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    • v.6 no.3
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    • pp.140-151
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    • 1999
  • Groundwater samples from the southern area composed of andesitic rocks and the northwestern area composed of granite in Pusan city, have been collected and analyzed. According to the Piper diagram. groundwater in the southern area belongs to Ca$\^$2+/-HCO$_3$$\^$-/ and Ca$\^$2+/-(Cl$\^$-/+SO$_4$$\^$2-/) types, and that in the northwestern area mostly belongs to Ca$\^$2+/-HCO$_3$$\^$-/ type and partly Na$\^$+/-HCO$_3$$\^$-/ type. Two factors (factor 1 and factor 2) were obtained from the result of the factor analysis in the southern area. Factor 1, consisting of Mg$\^$2+/, Ca$\^$2+/, Cl$\^$-/, SO$_4$$\^$2-/, NH$_4$$\^$+/, EC and NO$_3$$\^$-/ is represented by the dissolution of Ca-plagioclase and calcite, and the influence of anthropogenic sources. Factor 2, consisting of K$\^$+/, Na$\^$+/. SiO$_2$, SO$_4$$\^$2-/, and HCO$_3$$\^$-/ is mainly represented by the dissolution of feldspar. Three factors were obtained from the result of the factor analysis in the northwestern area Factor 1, consisting of Na$\^$+/, K$\^$+/, NH$_4$$\^$+/, Cl$\^$-/, SO$_4$$\^$2-/ and NO$_3$$\^$-/ explains dissolution of plagioclase and mica, the influence of anthropogenic sources and salt water. Factor 2, consisting of Ca$\^$2+/ and HCO$_3$$\^$-/ explains the dissolution of Ca-plagioclase. Factor 3, consisting of Mg$\^$2+/ and SiO$_2$, explains the dissolution of silicate minces. and contaminants. Based on the phase stability diagrams, groundwater both in the southern and in the northwestern area is mostly in equilibrium with kaolinite. Cl$\^$-/ with respect to Na$\^$+/, Ca$\^$2+/, Mg$\^$2+/, K$\^$+/, SO$_4$$\^$2-/ and HCO$_3$$\^$-/ indicates that both the northwestern area and the southern area are influenced by the salt water.

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A Survey on the Soil Environments of Alpine Vegetable Housing in Honam Area (호남지역(湖南地域) 고냉채소단지(高冷菜蔬團地)의 토양환경연구(土壤環境硏究))

  • Yoo, Chul-Hyun;Cho, Guk-Hyun;Choi, Jeong-Weon;Park, Keon-Ho
    • Korean Journal of Soil Science and Fertilizer
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    • v.21 no.3
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    • pp.246-253
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    • 1988
  • This survey was carried out to obtain the basic information for the stable high yield of income-crops. Cropping systems, soil morphological and chemical properties were investigated. The obtained results were summarized as follows: 1. In Jinan and Jangsu, cultivated area of radish was 76.5% and.65.4%, respecitively, but in Unbong Chinese Cabbage, 71.1%, by second Crop. 2. In topographycal distribution, the mountain foot slope area in Jinan, Jangsu and Unbong was 69, 77 and 85%, respectively. In the distribution of elevation, semi-Alpine region in Jinan and Unbong was 85 and 69%, respectively, but Alpine region in Jangsu was 62%, of cultivated area. 3. Ploughing depth was 0 to 10 cm in Jinan and Jangsu, and 11 to 15cm, in Unbong. Gravel content class was 4th class in Jinan and 3rd class in Jangsu and Unbong. 4. For the distribution of soil types, normal upland came to 69.2% in Unbong, sandy and skeletal upland, 46.1 % and normal and sandy upland, 39 and 38%, respectively, in Jangsu. 5. The uplands soil classified as the 5th class, with improper for adequate cropping were. 6. For the chemical properties according to topography available phosphate $(-0.344^*)$, Ca $(-0.398^*)$, K $(-0.485^{**})$ and CEC $(-0.325^{**})$ showed the negative significancy with the elevation. 7. Among the variations of chemical properties by continuous cropping, the soil pH $(-0.491^{**})$ and the content of organic matter $(-0.434^{**})$, Ca $(-0.705^{**})$, CEC $(-0.512^{**})$, total nitrogen $(-0.559^{**})$ showed the high negative correlations, while the contents of available phosphate $(0.671^{**})$ and K $(0.543^{**})$ showed the high positive correlations, with the number of years of continuous cropping.

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Effect of Mixed Application of Cinosulfuron with Dymron on Rice (Cinosulfuron과 Dymron의 혼합처리(混合處理)가 수도(水稻)(Oryza sativa L.)의 초기생육(初期生育)에 미치는 영향(影響))

  • Choi, Y.S.;Kim, K.U.;Shin, D.H.
    • Korean Journal of Weed Science
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    • v.12 no.2
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    • pp.110-123
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    • 1992
  • To investigate the safening effect of dymron against cinosulfuron, the responses of 104 rice cultivars and lines to single and mixture treatments of cinosulfuron [3-(4.6-dimethoxy-1,3,5-triazin-2-yl)-1-[2-(2-methoxyethoxy)-phenylsulfonyl]-urea] and dymron [1-(${\alpha}$, ${\alpha}$-dimethylbenzyl)-3-p-tolyl urea] were evaluated. The responses of 104 rice cultivars and lines to cinosulfuron were differed. Among the rice cultivars, growth of Calrose, Dasukei, Hwajinhyeo, and Milyang 105 was significantly inhibited by cinosulfuron but there was no inhibition in Daeseongbyeo, Iri 371, Jangseongbyeo, Taebaegbyeo and IR 74. The japonica types were generally inhibited more than the indica and indica${\times}$japonica types. When Kwangmyungbyeo was treated with the mixtures of cinosulfuron 48g and 96g ai/ha with dymron 450g ai/ha, the inhibition of plant height was significantly reduced regardless of dymron concentrations. With increase in cinosulfuron concentration, the safening effect of dymron against cinosulfuron was more evident in plant height than fresh weight. On the other hand, dymron did not have any safening effects of cinosulfuron on Echinochloa crus-galli at any concentrations. The mixtures of dymron and cinosulfuron produced antagonistic effects on the plant height regardless of rice cultivars and treatment concentrations. At cinosulfuron 24g ai/ha, the effects of the mixtures of cinosulfuron and brassinolide on the plant height of Kwangmyungbyeo and IR 74 were similar irrespective of brassinolide concentrations but the inhibition of Kwangmyungbyeo was greater than that of IR 74 as the concentrations of cinosulfuron increased. The effects of the mixtures of cinosulfuron at concentration of 96g ai/ha with various ABA levels on the plant height of both Kwangmyungbyeo and IR 74 showed synergistic effect regardless of ABA concentration. However, the response of fresh weight of both cultivars treated with cinosulfuron at 96g ai/ha with ABA synergisism was observed in Kwangyungbyeo while IR 74 showed antagonism.

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Hydrolysis of Rice Syrup Meal Using Various Commercial Proteases (쌀 시럽박의 단백질 가수분해 특성)

  • Kim, Chang-Won;Park, Jin-Woo;Choi, Hyuk-Joon;Han, Bok-Kyung;Yoo, Seung-Seok;Kim, Byung-Yong;Baik, Moo-Yeol;Kim, Young-Rok
    • Journal of Life Science
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    • v.21 no.2
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    • pp.309-315
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    • 2011
  • Rice syrup meal (RSM) was enzymatically hydrolyzed using eight commercial proteases (Protamex, Neutrase, Flavourzyme, Alcalase, Protease M, Protease N, Protease A, Molsin F) for 4 hr at optimum pH and temperature. Proteolytic hydrolysates were examined in supernatant and precipitate using Lowry protein assay, semimicro Kjeldahl method and gravimetric method using weight difference before and after enzymatic hydrolysis. Although RSM contains a high amount of protein (71.2%), only a very small amount of protein was hydrolyzed. Two proteases (Protease M and Protease N) were found to be the most effective in the hydrolysis of RSM protein. In Lowry method, 57.5 and 59.0 mg protein/g RSM were hydrolyzed after Protease M and Protease N treatments, respectively. In gravimetric method, 80.0 and 85.4 mg protein/g RSM were hydrolyzed after Protease M and Protease N treatments. In Kjeldahl method, 67.43 and 70.43 mg protein/g RSM were hydrolyzed after Protamex and Protease N treatments, respectively. For synergistic effect, two or three effective commercial proteases (Protease M, Protease N and Protease A) were applied to RSM at one time. The highest hydrolysis of RSM protein was observed in both Lowry protein assay (80.3 mg protein/g RSM) and gravimetric methods (153.2 mg protein/g RSM) when three commercial proteases were applied at one time, suggesting the synergistic effect of those proteases.