• Title/Summary/Keyword: 식품보존

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Comparison of Microwave and Conventional Cooking Methods on the Nutritional Composition of Potatoes -(1) Changes of Proximate Composition, Minerals and Water-soluble Vitamins- (감자의 몇가지 영양성분(營養成分)에 대한 마이크로파(波)와 재래적(在來的) 조리방법(調理方法)의 비교(比較) -1. 일반성분(一般成分), 무기질(無機質) 및 수용성(水溶性) 비타민의 변화에 대하여-)

  • Yoo, Yang-Ja
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.14 no.2
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    • pp.171-176
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    • 1985
  • The effects of cooking methods by boiling, electric oven and microwave on the proximate composition, minerals and water-soluble vitamins of two major Korean potato varieties (Soomi and Namjac) were studied. The dry matter content was increased after the cooking by the methods of electric oven and microwave, however, the crude fiber content was highly decreased by both methods. The crude ash content was not affected by the cooking methods used. The potassium content was increased by electric oven and microwave methods, and iron content was increased by electric oven baking, however, the copper content was significantly decreased by the electric oven and microwave cooking methods. The macrominerals (phosphorus, magnesium, calcium) and microminerals (zinc, manganese, nickel, lead, cadmium) content present initially in potatoes have not been changed by the cooking methods employed in this study. Relative retention value of ascorbic acid was the lowest and the value of thiamin was the highest in the potatoes cooked by microwave. The retention values of riboflavin and folic acid obtained. after boiling were similar to those after microwave cooking, and both of these treatments were superior to the electric oven baking. The retention values of niacin and vitamin $B_6$ varied between 93 and 100% depending on the cooking methods used. Overall, with a few exceptions, the retention values of water-soluble vitamins in boiled and microwave cooked potatoes were superior to those of the electric oven baked.

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Changes of Nutritional Compounds and Texture Characteristics of Peaches (Prunus persica L. Batsch) during Post-irradiation Storage at Different Temperature (감마선 조사와 저장온도에 따른 복숭아의 품질특성 변화)

  • Yun, Hye-Jeong;Lim, Sang-Yong;Hur, Jung-Mu;Lee, Bo-Young;Choi, Young-Ji;Kwon, Joong-Ho;Kim, Dong-Ho
    • Food Science and Preservation
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    • v.15 no.3
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    • pp.377-384
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    • 2008
  • The gamma irradiation process was performed to prolong a shelf-life of peaches and the effects of a gamma irradiation on the nutritional, physiochemical and sensory characteristics of peaches were evaluated during a post-irradiation storage at $4^{\circ}C$ and $25^{\circ}C$. Nutritional, physiochemical and sensory characteristics of peaches were stable at 1 kGy of an irradiation, a recommended dose for fruits and vegetables by CODEX, and the viable cell counts of contaminated microorganisms were reduced by 2 decimal reduction, at this dose. After a 1-week storage at ambient condition, the microbiological quality of the 1 kGy irradiated peach was stable, while all the non-irradiated peaches were deteriorated Furthermore, cold storage enhanced the shelf-life of the gamma irradiated peach and the nutritional and physiochemical characteristics of the peaches were comparatively stable up to 6 weeks. Right after gamma irradiation, the sensory evaluation results were not different in any of the samples, and the sensory quality of the irradiated peaches was adequate for a 4-week storage at $4^{\circ}C$. Our results suggested that gamma irradiation at 1 kGy can be used to enhance the shelf-life of peach without a significant loss in the quality attributes, especially upon cold storage after radiation treatment.

Inhibitory Effect of Organic Acids and Natural Occurring Antimicrobials Against Staphylococcus aureus Isolates from Various Origins (다양한 유래에서 분리된 황색포도상구균에 대한 유기산과 천연항균물질의 저해 효과)

  • Kim, Bo-Ram;Yoo, Jin-Hee;Jung, Kyu-Seok;Heu, Sung Gi;Lee, Sun-Young
    • Journal of Food Hygiene and Safety
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    • v.27 no.4
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    • pp.449-455
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    • 2012
  • The purpose of this study is to evaluate antimicrobial effects of organic acid and some natural occurring antimicrobials against Staphylococcus aureus isolated from various origins (vegetables, peanut, pea leaf, kim-bab, person, perilla leaf, and animal) and to calculate their MIC and MBC values. Five organic acids (acetic, lactic, citric, malic, and propionic acid), three essential oils (carvacrol, thymol, and eugenol), and two other natural antimicrobials (nisin and cinnamic acid) were evaluated for their antimicrobial effects against 113 strains of S. aureus using combination treatments. Propionic acid (7%), nisin (1%), thymol (1%), carvacrol (1%) showed antimicrobial activities against S. aureus strains in agar disc diffusion test. And, carvacrol, thymol, and nisin were found to be the most effective with the lowest MIC values of 0.0313%, 0.0625%, and 0.0625% against S.aureus, respectively. Propionic acid (0.2313%) and citric acid (0.6000%) were the most effective among organic acids tested. Therefore, these five antimicrobials were selected for next combination treatments. Combination of propionic acid and citric acid were showed the strongest inhibitory effectiveness against S. aureus among combination treatments. These results suggest that organic acid such as propionic and citric acid, and natural occurring antimicrobial such as nisin, carvacrol, and thymol might be possibly used as preservatives for inhibiting S. aureus in foods.

Quality Characteristics of Grapes during Post-irradiation Storage at Different Temperatures (감마선 조사 포도의 저장온도에 따른 품질특성 변화)

  • Yun, Hye-Jeong;Joe, Min-Ho;Kwon, Joong-Ho;Lim, Byung-Lak;Kim, Dong-Ho
    • Food Science and Preservation
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    • v.15 no.5
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    • pp.648-655
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    • 2008
  • A gamma irradiation process was applied to prolong the shelf-life of grapes and changes in microbiological, physicochemical, nutritional, and sensory characteristics were investigated during 6 weeks of post-irradiation storage at $4^{\circ}C$ and $25^{\circ}C$. Physiochemical characteristics of grapes such as total sugar content, pH, titratable acidity, and anthocyanine content, were stable after 1 kGy of irradiation, a dose recommended by CODEX for fruits and vegetables. The viable cell counts of contaminating microorganisms were reduced 1-2 logs by this radiation dose. After 6 weeks of storage at $4^{\circ}C$ the microbiological quality of irradiated grapes was stable, but all non-irradiated grapes had deteriorated. Whether or not grapes were irradiated, weight loss rapidly increased after 2 weeks of storage at $25^{\circ}C$, whereas weight loss was delayed by storage at $4^{\circ}C$. Immediately after gamma irradiation, the sensory evaluation results did not differ between samples, and the sensory quality of the irradiated grapes remained acceptable for over 6 weeks of storage at $4^{\circ}C$. The results suggest that 1 kGy of gamma irradiation does not detrimentally affect the nutritional or physical characteristics of grapes, especially when cold storage follows radiation treatment. In conclusion, a combination of gamma irradiation and cold storage prolonged the shelf-life of grapes by 6 weeks.

Identification of Aspergillus sp. Isolated from Red-Ginseng and Effect of Preservative on Its Growth (홍삼에 분리한 Aspergillus sp.의 동정 및 식품보존료가 균의 성장에 미치는 영향)

  • 주종재;곽이성
    • Journal of Food Hygiene and Safety
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    • v.11 no.3
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    • pp.203-207
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    • 1996
  • One kind of fungus was isolated and identified from comtaminated red-ginseng in order to give fundermental data for improving hygienic quality of ginseng product. The isolated strain was identified as Aspergillus sp. Hyphae of the strain had septum structrue. The strain showed vesicle and sterigmata structure which were typical characteristics of Aspergillus species. The growth of the strain was slightly inhibited by sodium benzoate and potassium sorbate at a concentration of 0.05%. The strain showed no growth at 4.0% potassium sorbate. The isolated stain Aspergillus sp. showed no significant degradation in the presence of red-ginseng saponins.

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Simultaneous Determination of Preservatives in Food by GC/MS (Gas Chromatography/Mass Spectrometry를 이용한 식품보존료의 동시분석방법 연구)

  • 김승기;노동석
    • Journal of Food Hygiene and Safety
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    • v.14 no.2
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    • pp.140-145
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    • 1999
  • Analytical method for preservatives in food was developed using gas chromatography/mass spectrometry (GC/MS). Propionic acid, sorbic acid, benzoic acid, ethyl salicylate, ethyl p-hydroxy benzoate, iso-propyl p-hydroxy benzoate, n-propyl p-hydroxy benzoate, iso-butyl p-hydroxy benzoate, n-butyl p-hydroxy benzoate, p-hydroxy benzoic acid and dehydro acetic acid were extracted from cooling beverage with diethyl ether. The polar hydroxyl and carboxyl groups of food preservatives were derivatized with N-methyl-N-tert-butyldimethylisilyl-trifluoroscetamide (MTBSTFA) to form the corresponding tert-bytyldimethyl-silylated derivatives, and submitted to GC/MS analysis. The mass spectra of the derivatives were investigated for the selection of monitoring ions for multi-residue analysis of 11 preservatives by GC/MS. The macro program was also developed for the qualitative analysis of these preservatives in food.

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리포트 - 식품안전, 식량안보와 수확후 관리기술

  • Kim, Byeong-Seok
    • Life and Agrochemicals
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    • s.253
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    • pp.42-43
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    • 2009
  • 지금 세계는 인구증가로 인한 시량부족이라는 커다란 위기단계에 직면해있다. 현재 70억, 2050년까지 90억 이상의 사람들에게 충분한 식량공급과 식품품질을 확보하는 것은 국제사회가 처한 매우 중대한 도전이다. 급격히 증가하는 식량 수요를 만족시키기 위한 대부분의 해결책들은 필수적으로 농산물의 생산량 증가에 기반하고 있지만, 이제는 지구 환경을 보호하는 지속농업을 유지하면서 세계 식량생산량의 25%에 해당되는 수확 후 손실을 최소화하는 방향으로 접근하는 것에 초점을 맞추어야 할 것이다. 저온저장은 수확 후 손실을 줄이는데 핵심적인 역할을 해오고 있다. 현재 방사선, 건조, 염장, 고압가공, 통조림 등 많은 수확후 보존기술들이 부패하기 쉬운 음식에 적용되고 있기는 하나, 이들 어떤 기술도 저온저장 기술처럼 소비자가 요구하는 생산물 저장수명 연장과동시에 초기의 물리적, 화학적, 영양학적, 감촉 특성을 유지시켜 주지는 않는다. 따라서 저온저장기술의 이용 증대만이 식품의 양과 질 측면에서 보다나은 전 세계인의 영양공급을 확보할 수 있게 할 것이다.

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농산부산물의 기능성 식품화 연구: 곶감 부산물의 유용성분과 생체기능성

  • Jeong, Sin-Gyo
    • Proceedings of the Korean Society of Life Science Conference
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    • 2002.05a
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    • pp.9-16
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    • 2002
  • 농산부산물 중 식품화 요건이 비교적 적합한 곶감부산물을 기능성 소재로 활용하고자 전처리에 따른 유용성분인 카로티노이드의 함량변화를 조사하였다. 조추출물의 항고혈압활성 및 동물실험에 의한 항당뇨 및 지질대사 개선 효과를 조사하였다. 1. 농산부산물의 기능성 식품화에는, 함유 성분의 특정 생체 기능성, 수집성, 함수율, 안전성 등의 요건이 만족될 필요가 있다. 2. 입도와 건조온도에 따라 보존기간 중 감피의 총카로티노이드와 베타카로틴의 함량은 60일 후에 80% 정도 감소하였으며 입도가 적을수록 감소폭이 컸다. 3. 감과피의 메탄올 조추출물에 대한 항고혈압성은 $11.76{sim}58.61%$의 저해활성을 보여 품종별로 다소 차이를 보였다. 4. Streptozotocin으로 당뇨를 유도한 실험쥐에 대하여 감껍질 분말의 혈당강화 및 지질대사의 개선능력을 검정한 결과 혈당치, 총지질 및 중성지질, 총콜레스테롤의 함량이 대조구에 비하여 유의적으로 낮았다.

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High voltage pulse circuit based on current source for Pulsed Electric Field method (펄스 전기장 방식을 위한 전류원 기반의 고전압 펄스 발생 회로)

  • OH, Hyun Jun;kang, Yoonsu;Hwang, Hoonha;Roh, Chung Wook
    • Proceedings of the KIPE Conference
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    • 2020.08a
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    • pp.230-232
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    • 2020
  • 식품을 보다 신선하고 오래 보관하기 위하여 처리 및 보존에 관한 여러 방법들이 연구되고 있다. 특히 열에 민감한 유제품 또는 액체 식품들에 대하여 열을 가하지 않는 비열처리 방식의 기술들이 연구되고 있다. 그 중 식품 내 미생물의 활성화와 고유한 속성의 변화를 최소화하는 방법으로 Pulsed Electric Field 방식에 대한 연구가 활발히 진행되고 있다. 하지만 해당방식은 기존의 열처리 방식에 비해 경제적인 면에서 단점을 가지고 있다. 이에 본 논문에서는 기존 Pulsed Electric Filed 방식의 효율을 높이고 비용을 저감할 수 있는 회로를 제안한다. 전압제어 방식의 DC/DC Power stage 부를 전류제어 방식으로 바꾸어 기존 회로의 Charging resistor를 사용하지 않음으로써 전력손실을 줄이고 비용 및 전기요금을 줄이고자 하였다. 본 논문에서는 시뮬레이션을 통해 제안회로를 검증하였다.

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Distribution of Indicator Organisms and Influence of Storage Temperature and Period in Commercial Animal Foods (시판 동물성 식품의 오염지표세균 분포 및 저장온도, 기간별 오염지표세균의 변화)

  • 이용욱;박석기
    • Journal of Food Hygiene and Safety
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    • v.13 no.4
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    • pp.430-440
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    • 1998
  • The average number of total viable counts for the commercial pork tested was 19/g, coliform 1.8/g, psychrophilic bacteria 15/g, heterotrophic bacteria 12/g, fecal streptococcus 6.2/100 g, Pseudomonas aeruginosa 13/100 g and none of heat-resistant bacteria and Staphylococcus was detected. That for the commercial beef tested was 130/g, coliform 5.2/g, psychrophile 140/g, heterotroph 28/g, Staphylococcus 1.2/g, fecal streptococcus 9.5/100 g, Pseud. aeruginosa 1.9/100 g and heat-resistant bacteria was not detected. That for the commercial chicken tested was 8800/g, coliform 53/g, psychrophile 4600/g, heterotroph 4700/g, fecal streptococcus 9.9/100 g, Pseudo aeruginosa 2.5/100 g. That for milk was 4700/ml, psychrophile 120/ml, heterotroph 420/ml and the others were not detected. That for the commercial cheese was 3.2/g, psychrophile 2.3/g, heterotroph 1.6/g, Staphylococcus l/g, fecal streptococcus 9.1/g. That for fermented milk was $10^{7}/ml$, heatresistant bacteria $10^{6}/ml$, fecal streptococcus 2400/100 ml, lactobacillus $3.2{\times}10^{15}/ml$, in accordance with lactic acid bacteria and the others were not detected. There was not detected any indicator organisms from ham, sausage, butter, eggs and quails in the commercial fooods tested. SPC, coliform, psychrophile and heterotroph in commercial meats stored at $10^{\circ}C$ were increased rapidly as time goes on but heat-resistant bacteria, staphylococcus, fecal streptococcus and Pseudo aeruginosa were constant. At $20^{\circ}C$, SPC, coliform, psychrophile, heterotroph and fecal streptococcus were the highest at 7 days and heat-resistant bacteria, staphylococcus and Pseudo aeruginosa were increased a little. At $30^{\circ}C$, all indicators were increased rapidly for 3 and 7 days and then decreased rapidly. All indicator organisms were increased at the level of 10/g for 14 days in meat products stored at $10^{\circ}C$, but SPC, psychrophile and heterotroph in meat products stored at $20^{\circ}C$ were increased at the level of $lO^5/g$. It showed that the indicators in meat products stored at $30^{\circ}C$ had a tendency to increase at the level of $10^{2}/g$ relative to those stored at $20^{\circ}C$. SPC, psychrophile and heterotroph in milk stored at $10^{\circ}C$ increased up to the level of $10^4/ml$, but coliform, staphylococcus, fecal streptococcus and Pseudo aeruginosa were not detected. As stored at $20^{\circ}C$ and $30^{\circ}C$, they were increased rapidly for 1 or 3 days and then constant for a long time.

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