• 제목/요약/키워드: Compositional differences

검색결과 83건 처리시간 0.032초

잎담배 엽육과 주맥의 휘발성 정유성분 및 비휘발성 유기산의 비교 (Comparison of Volatile Aroma Components and Non-volatile Organic Acids in Tobacco Lamina and Stems.)

  • 김영회;박준영;양광규;김옥찬
    • 한국연초학회지
    • /
    • 제8권2호
    • /
    • pp.51-66
    • /
    • 1986
  • Volatile aroma components, non-volatile organic acids in lamina and stems of flue-cured(NC 2326) and burley ( Burley 21) were analyzed by gas chromatography and mass spectrometry, respectively. Then compositional differences of these components between lamina and stems were discussed. The contents of volatile components were higher in flue-cured than in burley tobacco, and it was also higher in lamina then in stem. The major aroma components in lamina were neophytadiene , nicotine, solanone and benzyl alcohol but those in stems were palmitic acid, neophytadiene, nicotine, solanone and phenyl ethyl acetate. On the other hand, the contents of non-volatile organic acids were higher in burley than in flue-cured tobacco, and these values of burley tobacco were higher in lamina than in stem but flue-cured tobacco were higher in stem than in lamina. The major acids in all the above four tabacco samples were malic, citric, oxalic and linolenic acid.

  • PDF

Analysis of Flavonoid Composition of Korean Herbs in the Family of Compositae and their Utilization for Health

  • Nugroho, Agung;Choi, Jae Sue;Park, Hee-Juhn
    • Natural Product Sciences
    • /
    • 제22권1호
    • /
    • pp.1-12
    • /
    • 2016
  • Compositional differences in flavonoids are varied in the big family of Compositae. By summarizing our previous analytical studies and other scientific evidences, new strategy will be possible to further analyze flavonoids and utilize them for human health. The HPLC analytical method has been established in terms of linearity, sensitivity, accuracy, and precision. Herbs of the family of Compositae have considerable amounts of peroxynitrite ($ONOO^-$)-scavenging effects and their phenolic substances. These effects may contribute to the prevention of disease associated with excess production of $ONOO^-$, depending on the high content of flavonoid substances.

A surface chemical analysis strategy for the microstructural changes in a CuAgZrCr alloy cast under oxidation conditions

  • Ernesto G. Maffia;Mercedes Munoz;Pablo A. Fetsis;Carmen I. Cabello;Delia Gazzoli;Aldo A. Rubert
    • Advances in materials Research
    • /
    • 제13권2호
    • /
    • pp.141-151
    • /
    • 2024
  • The aim of this work was to determine the behavior of alloy elements and compounds formed during solidification in the manufacturing process of the CuAgZrCr alloy under an oxidizing environment. Bulk and surface analysis techniques, such as Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), Raman and X-ray diffraction (XRD) were used to characterize the phases obtained in the solidification process. In order to focus the analysis on the on grain boundary interface, partial removal of the matrix phase by acid attack was performed. The compositional differences obtained by SEM-EDX, Raman and XPS on post-manufacturing materials allowed us to conclude that the composition of grain boundaries of the alloy is directly influenced by the oxidizing environment of alloy manufacturing.

저장온도와 저장기간에 따른 꽁치과메기의 산패도 (Studies on the Rancidity of Pacific Saury, Cololabis saira Kwamaegi on the Storage Temperatures and Durations)

  • 이호진;오승희;정지숙;최경호
    • 한국식품영양학회지
    • /
    • 제21권4호
    • /
    • pp.477-484
    • /
    • 2008
  • The Pacific saury, Cololabis saira Kwamaegi, is a traditional local food of the Eastern sea area, centered around Pohang. It is well-recognized as being both tasty and nutritious. Nevertheless, bacterial contamination, excessive dryness, and compositional changes render this fish edible only during the winter months. Thus, to improve its storage capabilities, this study assessed the effects of storage material, type, temperature, and duration on compositional changes in Kwamaegi. The assessed samples were Kwamaegi which had been naturally dried for 15 days. The storage materials included an A-film, a self- developed multi-film made of polyethylene, polyamide, EVOH, and polyethylene, and a B-film made of polyethylene, nylon, polyethylene, nylon, and polyethylene. The B films were utilized after pressing and lamination. The storage types included one whole fish(1G), or 2 divided fish(2G), to increase eating convenience. The 2G type was the muscle portion divided vertically after discarding the jowl, skin, and internal organs. The storage temperatures were 0, -15 and $-30^{\circ}C$, and the storage durations were 2, 4, and 6 months. Among the lipid rancidities, acid value and peroxide value showed the highest level of initial rancidity at a storage temperature of $0^{\circ}C$ for 2 months. We noted no significant differences between storage materials. The lower the storage temperatures, the less acid and peroxide were generated. Between the storage types, 1G evidenced lower less acid values than 2G. The TBA values revealed a dramatic increase at a storage temperature of $0^{\circ}C$ for 2 months, whereas this rapid progress was not observed at storage temperatures of -15 and $-30^{\circ}C$. Along with the acid value and peroxide value, the samples stored at 0, -15 and $-30^{\circ}C$ evidenced significantly lower TBA values. The B-film evidenced a slightly lower TBA value than was observed in the A-film, but no significant differences were observed.

새로운 생명공학작물 안전성 평가를 위한 작물 성분 DB 구축 (Development of the conventional crop composition database for new genetically engineered crop safety assessment)

  • 김은하;이성곤;박수윤;이상구;오선우
    • Journal of Plant Biotechnology
    • /
    • 제45권4호
    • /
    • pp.289-298
    • /
    • 2018
  • 국립농업과학원 생물안전성과는 생명공학기술로 개발되는 작물(GM작물)의 안전성 평가 중 '성분분석에 의한 비교평가'에 참고자료로 활용할 수 있도록 기존 상업화 작물성분의 분석 데이터를 제공하는 "작물성분 DB"를 구축하였다. "작물성분 DB"는 우리나라의 자연 환경에서 재배되는 주요 작물 품종들의 영양성분 함량정보를 제공함으로써 품종과 재배 지역, 연도에 따라 함량의 변화 정도를 확인할 수 있도록 데이터를 업그레이드 하고 있다. 현재 2곳 이상의 재배지역에서 2년 이상 재배한 벼와 고추 시료에 대한 주요 영양분과 항영양소, 2차 대사산물을 검증된 분석 방법을 사용하여 분석한 데이트를 제공하고 있다. 데이터는 평균값과 최저, 최대값을 제공함으로써 GM작물의 안전성 평가시 GM작물과 대응 비교작물 간에 나타나는 통계적 차이가 기존 상업작물의 생물학적 차이 또는 허용범위 내에 속하는지를 평가할 수 있도록 하였다. "작물성분 DB"는 사용자가 선택한 쿼리를 기반으로 쉽게 검색하고 활용하도록 하고 있다. 또한 유색미와 감자, 고구마, 콜리플라워와 같은 유색 작물의 기능성 성분 함량 정보를 제공하고 있어 일반 소비자들도 유용하게 정보를 활용할 수 있다. 본 논문은 상업작물 성분에 대한 중요한 정보를 제공하는 농진청 "작물성분 DB"의 구성과 사용법을 소개하였다.

Habitat selection in the lesser cuckoo, an avian brood parasite breeding on Jeju Island, Korea

  • Yun, Seongho;Lee, Jin-Won;Yoo, Jeong-Chil
    • Journal of Ecology and Environment
    • /
    • 제44권2호
    • /
    • pp.106-114
    • /
    • 2020
  • Background: Determining patterns of habitat use is key to understanding of animal ecology. Approximately 1% of bird species use brood parasitism for their breeding strategy, in which they exploit other species' (hosts) parental care by laying eggs in their nests. Brood parasitism may complicate the habitat requirement of brood parasites because they need habitats that support both their host and their own conditions for breeding. Brood parasitism, through changes in reproductive roles of sex or individual, may further diversify habitat use patterns among individuals. However, patterns of habitat use in avian brood parasites have rarely been characterized. In this study, we categorized the habitat preference of a population of brood parasitic lesser cuckoos (Cuculus poliocephalus) breeding on Jeju Island, Korea. By using compositional analyses together with radio-tracking and land cover data, we determined patterns of habitat use and their sexual and diurnal differences. Results: We found that the lesser cuckoo had a relatively large home range and its overall habitat composition (the second-order selection) was similar to those of the study area; open areas such as the field and grassland habitats accounted for 80% of the home range. Nonetheless, their habitat, comprised of 2.54 different habitats per hectare, could be characterized as a mosaic. We also found sexual differences in habitat composition and selection in the core-use area of home ranges (third-order selection). In particular, the forest habitat was preferentially utilized by females, while underutilized by males. However, there was no diurnal change in the pattern of habitat use. Both sexes preferred field habitats at the second-order selection. At the third-order selection, males preferred field habitats followed by grasslands and females preferred grasslands followed by forest habitats. Conclusions: We suggest that the field and grassland habitats represent the two most important areas for the lesser cuckoo on Jeju Island. Nevertheless, this study shows that habitat preference may differ between sexes, likely due to differences in sex roles, sex-based energy demands, and potential sexual conflict.

쥐눈이콩 첨가량을 달리한 초콜릿 제조 조건의 최적화 (Optimization of the Addition of Jinuni Beans to Chocolate Using the Response Surface Methodology)

  • 주나미;김보람;표서진
    • 대한영양사협회학술지
    • /
    • 제16권1호
    • /
    • pp.13-21
    • /
    • 2010
  • The purpose of this study was to determine the optimal mixing conditions of different amounts of Jinuni beans and fresh cream for the preparation of Jinuni bean chocolate. An experiment was designed using the central composite design of the response surface, which required 10 experimental treatments including 2 replicates for the Jinuni bean and fresh cream. The compositional and functional properties of the treatments were measured and these values were applied to the mathematical model. A canonical form and perturbation plot showed the influence of each ingredient on the mixture products. The color value L (Lightness) decreased with an increase in the amount of added Jinuni bean but the color value a (redness) and color value b (yellowness) did not change. In addition, the hardness value increased with the addition of the Jinuni bean. The results of the sensory evaluation showed very significant differences in the values of the texture (p<0.01), taste (p<0.05), and overall quality (p<0.01). As a result, the optimum formulations as determined by the numerical and graphical methods were 27.98 g of Jinuni bean and 67.0 g of fresh cream.

Rf Magnetron Sputtering 방법으로 제조된 $Ba_{1-x}Sr_xTiO_3$ 박막의 구조적 특성에 대한 연구 (A Study on the Structural Properties of rf Magnetron Sputtered $Ba_{1-x}Sr_xTiO_3$ Thin Film)

  • 김태송;오명환;김종희
    • 한국세라믹학회지
    • /
    • 제30권6호
    • /
    • pp.441-448
    • /
    • 1993
  • The Ba1-xSrxTiO3 thin films deposited on ITO-coated glass substrate at 55$0^{\circ}C$ by rf magnetron sputtering method have individual preferential orientations as a function of composition (X=0, 0.25, 0.5, 0.75, 1) due to the stress relief interactions among the intrinsic compressive stress, thermal tensile stress adn extrinsic compressive stress (compressive stress in case of BaTiO3(Tc=12$0^{\circ}C$) and Ba0.75Sr0.25TiO3(Tc=57$^{\circ}C$)). This behavior also appears on the (BaSr)TiO3 thin films (X=0.5) deposited on ITO-coated glass substrate at deposition temperature between 35$0^{\circ}C$ and 55$0^{\circ}C$. The composition of Ba1-xSrxTiO3 thin films deposited on ITO-coated glass substrate at 55$0^{\circ}C$ is close to stoichiometry (1.009~1.089 in A/B ratio), but the compositional deviation from a stoichiometry is larger as SrTiO3 is added. The morphology of Ba1-xSrxTiO3 thin films is very similar for over all substrate temperatures, and the roughness due to the differences of cluster size is the smallest at X=0.25.

  • PDF

The Forest Vegetation of Mt. Jangan County Park in Jangsu-Gun, Jeonlabuk-Do, Korea

  • Kim, Chang-Hwan;Ahn, Deug-Soo
    • The Korean Journal of Ecology
    • /
    • 제23권6호
    • /
    • pp.439-444
    • /
    • 2000
  • Forest vegetation in Mt. Jangan County Park, Jeonlabuk-Do, Korea, was investigated by classification and ordination methods. By the cluster analysis (classification) method, nine groups were recognized as follows : Quercus serrata community, Quercus serrata- Carpinus laxiflora community, Cornus controversa community, Fraxinus mandshurica community, Carpinus laxiflora community, Quereus variabilis community, Quercus mongolica - Sasa borealis community. Quercus mongolica - Symplocos chinensis for. pilosa community and Quercus mongolica - Rhododendron schlippenbachii community. These groups showed differences in species composition and environmental characteristics, but Quercus mongolica - Sasa borealis community, Quercus mongolica - Symplocos chinensis for. pilosa community and Quercus mongolica - Rhododendron schlippenbachii community among them showed very similar floristic composition to each other. The interrelationship between the floristic composition of the vegetation and environmental factors was analysed by principal component analysis (PCA). Quercus mongolica community was distributed at a high altitude (900~1200 m above sea level). Fraxinus mandshurica community and Cornus controversa community were differentiated from the other communities with high contents of soil moisture and pH. On the other hand, Carpinus laxiflora community and Quercus variabilis community were distributed at places with adequate levels of soil moisture, soil organic matter. and at low altitude. In this study, the altitude and soil moisture were the main factors determining the forest vegetation. They were strongly correlated with the dominant compositional gradient at the localities examined.

  • PDF

느타리버섯의 배지별 Amino acid 함량변화에 관한 연구 (Studies on the Changes of Amino acid Contents on Pleurotus ostreatus)

  • 유정;이공준;정기태;나종성
    • 한국균학회지
    • /
    • 제22권4호
    • /
    • pp.338-342
    • /
    • 1994
  • 배지 재료를 달리한 느타리 버섯의 갓 크기와 자루속의 아미노산을 분석해 본 결과는 다음과 같다. 1. 배지 재료별 느타리 버섯의 아미노산 함량은 톱밥배지와 폐솜배지에 비해 볏짚배지에서 적었으며 아미노산 17종이 확인 정량되었다. 2. 느타리버섯의 아미노산은 Glutamic acid 함량이 가장 많았으며, Cystine 함량이 가장 적었다. 3. 느타리 버섯의 갓 크기별 아미노산 함량은 볏짚재배는 $3{\sim}7\;cm$, 톱밥재배는 3cm 이하, 폐솜재배는 7cm 이상에서 많았으며 버섯의 부위별은 자루보다 갓에서 많았다.

  • PDF