• 제목/요약/키워드: Taste & Odor

검색결과 467건 처리시간 0.029초

부영양호 원수의 냄새유발 물질 탈기 특성 (Air stripping of odor causing materials from eutrophic lake water)

  • 박노백;송용효;나광주;박상민;전항배
    • 상하수도학회지
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    • 제22권5호
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    • pp.523-529
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    • 2008
  • Algal blooms in a local eutrophic lake often produces the musty and earthy taste & odor problems. Since the odor causing compounds(OCCs) including geosmin and 2-MIB have their own volatility, the OCCs can be removed from water by air stripping methods. Removal of TON(threshold odor number) as an index for OCCs could be fitted well with the first order equations($R^2=0.9$ above), where the air stripping coefficient of TON, k was in the range between 0.0055 and 0.0097 according to the aeration time. k within 30min aeration tests was 0.0097, while it was 0.0055 where the aeration time extended to 150min. With 15 mg/L of PAC, removal of TON was not simulated with 1st order equation within 30min aeration. Within 30min aeration, OCCs rather than geosmin and/or 2-MIB could be removed easily by air stripping or PAC adsorption, while OCCs such as geosmin and/or 2-MIB could be removed slowly by air stripping after 30min aeration. Geosmin and 2-MIB were not readily removed by air stripping(k of them were 0.0018~0.0047 and 0.0018~0.0034, respectively at different air flow rates). Geosmin could be removed by air stripping a little better than 2-MIB.

김치재료의 주요한 냄새성분과 김치숙성중의 냄새성분 및 관능적특성의 변화 (Major Odor Components of Raw Kimchi Materials and Changes in Odor Components and Sensory Properties of Kimchi During Ripening)

  • 정혜승;고영태
    • 한국식생활문화학회지
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    • 제25권5호
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    • pp.607-614
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    • 2010
  • Changes in major volatile odor components (VOC) and sensory properties of kimchi during ripening for 4 days were investigated, and major VOCs of the raw materials of kimchi were also analyzed. Seven of eight major VOCs of kimchi originated mainly from garlic, while one originated from ginger. During 4 days of kimchi ripening, the amount of ethanol, which was substantially higher than that of other VOCs, increased continuously but decreased slightly on the fourth day. The amount of diallyl disulfide decreased during ripening, while that of allyl mercaptan decreased on the first day and increased slightly thereafter. The amount of methyl allyl sulfide, diallyl sulfide, and methyl trisulfide increased continuously during ripening, while that of dimethyl disulfide and methyl propyl disulfide increased until the second day and decreased thereafter. Scores of overall acceptability, taste, and odor for kimchi ripened for 2 days were significantly higher than those of other samples (p<0.05). The correlation between scores of overall acceptability and the amount of dimethyl disulfide or methyl propyl disulfide was higher than that of other VOCs.

오존처리가 인삼분말의 지방산과 유기산 함량 및 향미특성에 미치는 영향 (Effect of Ozone Treatment on the Changes of Fatty Acids, Organic acids, and Sensory Properties in Ginseng Powder)

  • 곽이성;최강주;김나미
    • 한국식품위생안전성학회지
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    • 제11권1호
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    • pp.51-55
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    • 1996
  • As a preliminary experiment to investigate the effect of ozone sterelization on the ginseng powder, the changes of fatty acid composition and organic acid content and sensory properties in ginseng powder treated with ozone was investigated. Ginseng powder was treated with 0.5 ppm ozone for 24 hours and 48 hours, respectively. With increase in ozone treatment time, the content of crude lipid and increase. Contents of unsaturated fatty acid-linolenic acid, linoleic acid, and oleic acid, etc.-decreased with ozone treatment time, whereas saturated fatty acid or same number-stearic acid-increased odor, bitter taste, roasted taste and sweet taste were thiner with ozone treatment times, but pungent taste was thicker with those treatment. These changes of ordors and tastes of ginseng powder with ozone treatment were predicted by oxydation of lipids, flavor components and saponins.

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콩나물 식미 결정 성분 요인 분석 (Analysis of Chemical Factors Determining Taste of Soybean Sprouts)

  • 황인택;이경애;김희선;김용호
    • 한국작물학회지
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    • 제58권4호
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    • pp.347-352
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    • 2013
  • 나물콩 5품종(녹채콩, 다원콩, 서남콩, 오리알태, 풍산나물콩)으로 재배한 콩나물을 실험재료로 사용하여 콩나물의 맛 관련지표를 탐색하였다. 공시재료로 재배된 콩나물들의 이화학적 성분함량과 관능평가와의 상관관계 등을 분석하여 콩나물의 맛에 관련된 지표를 판단하였으며, 분석결과 아미노산, 지방산, 무기질 함량이 콩나물의 관능 특성과 연관이 있었다. 아미노산 중 histidine, aspartic acid, serine 등이 콩나물의 비린 맛과 부의 상관을 보이는 동시에 달콤한 맛과는 유의성은 없었으나 어느 정도 정의 상관 경향이 나타났다. 지방산에서는 콩나물의 전체적 선호도에 linolenic acid가 정의 상관인 반면 oleic acid와는 부의 상관을 보였다. 무기질 중에는 Ca 함량이 콩나물의 전체적 선호도와 정의 상관을 나타내었다. 한편, 콩나물 맛 관련 지표를 탐색하기 위하여 콩나물의 화학성분 47개를 다중회귀식으로 검토한 결과 콩나물의 전체적 선호도에는 linolenic acid 등 지방산 함량의 영향이 크게 나타났다. 아미노산 중에는 arginine과 serine의 영향이 컸으며 무기이온 중에는 Ca의 함량이 콩나물 맛에 영향을 끼치는 것으로 나타났다.

홍삼과 녹차 첨가 약과에 대한 소비자의 인지도 및 기호도 - 한.중.일 신세대 여성 소비자를 대상으로 - (The Perception and Preference of Red-ginseng and Green Tea Yackwa Among Korean.Chinese.Japanese Female Consumer)

  • 여가은;박재영;조미숙
    • 동아시아식생활학회지
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    • 제23권5호
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    • pp.533-545
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    • 2013
  • A type of Korean traditional cookies, yackwa is composed of ingredients which serve as good medicine to people. Further, it has a priceless value and possibility to be a healthy functional dessert. For this study, we developed variable yackwa, containing red-ginseng powder and green tea powder, in order to target the foreign market as well as to investigate the perception and preference of yackwa. The test sample for the control group, yackwa is made of flour, sugar, baking powder, sesame oil and alcohol. For the experimental group, yackwa contains red-ginseng and green tea powder (3, 6, 9, 12%). The investigation period was May 14th, 2013 and the total number of participants was 100. The investigation applied a consumer survey method by filling out a questionnaire while tasting 9 kinds of yackwa samples. They were used for frequency, one-way ANOVA and Pearson's correlation analysis with SPSS 19.0. In the yackwa perception survey, the result indicated that 52.0% of the customers replied 'Do not know well' and 'Do not know at all' which conveys that the perception of yackwa is very low. In contrast, the perception of the red-ginseng and green tea which are functional ingredients is high and the customers tend to prefer the taste and flavor of green tea than red-ginseng. And they prefer the yackwa containing 3% of red-ginseng and green tea powder compared to other ratio contents in the overall preference, color, taste, flavor, odor, degree of greasiness and texture. When people who have a higher perception of yackwa, they tended to prefer the color of red-ginseng yackwa and dislike the color of green tea yackwa. And the more people prefer the taste of green tea, the higher in overall preference, color, taste, flavor, and odor preference.

볶음 조건에 따른 구기자 열수 추출물의 이화학적 특성 (Physico-chemical Properties of Boxthorn(Lycii fructus) Hot Water Extracts by Roasting Conditions)

  • 이부용;김은정;최희돈;김윤숙;김인환;김성수
    • 한국식품과학회지
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    • 제27권5호
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    • pp.768-772
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    • 1995
  • 건 구기자와 볶음조건을 달리한 볶은 구기자의 열수 추출물에 대하여 여러 가지 이화학적 특성을 조사하였다. 건 구기자의 일반성분은 수분 17.5%, 회분 5.4%, 지방 14.7%, 단백질 18.9%, 섬유질 12.8%, 당질 31.7%였다. 열수 추출시 추출수율은 볶음온도와 시간이 증가할수록 가용성 고형분이 더 빨리 추출되었으며, 색도는 명도가 감소하고 적색도가 증가하여 추출물이 더 진한 갈색을 나타내었고 탁도 역시 증가하였다. pH는 볶음온도와 시간이 증가할수록 5.08에서 4.38로 감소하였고 산도는 0.09%에서 0.16%로 증가하였다. 유리당 함량은 볶음온도와 시간이 증가할수록 감소하였고 특히 glucose함량이 0.45%에서 0.12%로 크게 감소하였다. 지방산 조성은 건 구기자에 비해 볶음온도와 시간이 증가할수록 linoleic acid의 비율이 감소하고 palmitic acid의 비율이 증가하였다. 관능검사 결과는 볶음온도와 시간이 증가할수록 단 냄새, 탄 냄새, 신 맛, 탄 맛, 떫은 맛 등은 증가하였고 단 맛과 구수한 맛은 약간 감소하였다.

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분말활성탄 흡착 및 탈기에 의한 이취미 제거 (Removal of Taste and Odor by Powdered Activated Carbon Adsorption and Air Stripping)

  • 전항배;나광주;서태경;박상민
    • 상하수도학회지
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    • 제22권4호
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    • pp.455-460
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    • 2008
  • Powered activated carbon(PAC) has been widely applied for controling odor causing compounds(OCCs) from water treatment plants. Because of their volatility, the OCCs can also be removed from water by air stripping methods. In this study, OCCs removal was tested with PAC adsorption, air stripping, and both PAC adsorption and air stripping from the Taecheong lake water. Removal efficiency of OCCs in terms of threshold odor number(TON) were 39.6% by both PAC (15mg/L) adsorption and aeration for 30 min, 33.6% by PAC(15mg/L) adsorption alone for 30 min, and 22.9% by aeration alone for 30 min, respectively. OCCs could be removed up to 50% by aeration for 120 min without PAC adsorption. At an extended aeration with 15mg/L of PAC, OCCs removal occurred mainly by PAC adsorption within 30 min aeration while it continued by air stripping afterward. At simulated jar tests with the raw water, removal efficiencies of geosmin and MIB were 48.3, 36.1% by coagulation and sedimentation without PAC addition. With 15mg/L of PAC on the same jar tests, the removal efficiencies were 83.1, 60.1%, respectively. Without PAC, OCCs could be possibly removed by stripping during the agitation processes.

떫은 감과 감잎을 이용한 과립차 개발에 관한 연구 (Development of Granular Tea by Using Astringent Persimmon and Persimmon Leaves)

  • 변광인;권용주;박미란
    • 한국조리학회지
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    • 제14권2호
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    • pp.273-285
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    • 2008
  • The purpose of this study was to find appropriate processing condition of astringent persimmon and persimmon leaf granular tea. Under the condition of 4 hour extraction and $50^{\circ}brix$, extraction yield and concentrating of astringent persimmon were the greatest. Under the condition of 2 hour extraction and $7^{\circ}brix$, extraction yield and concentrating of persimmon leaf were the greatest. The optimum condition of granular tea with astringent persimmon and persimmon leaf added was the best in astringent persimmon concentrate of 16% and persimmon leaf concentrate of 4%. It had the best taste after the condition in a brix value of 16.15% and a pH of 5.57. The L-value of chromaticity was -79.13, a-value 2.27, and b-value 2.41. In the sensory properties correlation analysis of astringent persimmon and persimmon leaf granular tea, sweet taste, color acceptability, odor acceptability and taste accept-ability were positively significant correlation with most sensory properties. However, astringent taste was no significant correlation with sensory acceptability. Bitter taste and after taste were negatively significant correlation with most sensory properties.

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냉면육수의 품질에 관한 연구 - 동치미 발효 정도와 첨가량에 따른 관능적 및 미생물학적 특성 - (A study on the quality of Naengmyon Broth - Sensory and Microbiological properties by fermentation and addition of Dongchimi-)

  • 김형렬;장명숙
    • 한국식품조리과학회지
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    • 제21권1호
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    • pp.1-11
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    • 2005
  • The application of Dongchimi liquid into Naengmyon broth for the improved eating quality of Naengmyon was scientifically explored by reviewing the quality properties of the product. Primarily, the optimum fermentation conditions for Dongchimi from which the liquid portion was extracted were pursued and the optimum mixing ratio was sought on the basis of sensory and microbiological properties of the product. The liquid portions which had been periodically extracted from Dongchimi at intervals of two or five days during fermentation at $10^{\circ}C$ were added to Naengmyon broth. The treatments were prepared with three levels, namely, basic broth only('A') and the ratios of 3:7(v/v, 'B') and 5:5(v/v, 'C') of Dongchimi liquid and basic broth, respectively. According to assessments of Dongchimi liquid on taste and intensity based on sensory analyses, the organoleptic factors such as color, smell, sour taste, carbonated taste, and overall acceptability were given higher values from day 11 to day 17 in all items. As for the assessment of Dongchimi liquid on intensity, color, sour odor, moldy odor, and carbonated taste have shown the increasing scores during with high intensities while those for clearness has stayed low. Most of the phenomena observed from the Naengmyon broth substituted with $30\%$ (Treatment 'A') and $50\%$ (Treatment 'B') of Dongchimi liquids with different storage periods ensued much of the previous fermentation pattern of Dongchimi itself. Organoleptic assessment on taste and its intensity showed that better(the best) scores could be obtained at between day 16$\~$25(17) and 13$\~$20(15) for Treatments A and B, respectively. The intensity scores of taste for color, smell, carbonated taste, sour taste, and mouthfeel were increased while those for clearness, palatability, and meaty ones were decreased with lapse of fermentation. The numbers of total cell and lactic acid bacterial counts of Dongchimi has increased until day 13 and then decreased in the later stages. Total cell count and lactic acid bacterial counts of Naengmyon broth also increased until the 13th day and then they began to decrease. It was also proven that slightly over-ripened Dongchimi liquid was more preferable for adding into Naengmyon broth. Granting the optimum ripening period of Dongchimi liquid itself to be 13 days, both Treatment A and Treatment B were evenly favored using Dongchimi liquids slightly over-ripened at days 13 to 17. However, Treatment A was more favored than Treatment B when Dongchimi liquid over-ripened for 20 to 26 days was used.