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- 저자 : Jung Sunghyeon (검색결과 3 건)
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Jung Hyojik,Kim Inhwan,Jung Sunghyeon,Lee Jihyun 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.1
Chia seed and flax seed oils are rich in polyunsaturated fatty acids, but are susceptible to oxidative deterioration. The aim of this study was to determine the oxidative stability of chia seed and flax seed oils and enhance the stability using rosemary or garlic extracts. During accelerated storage at 65 °C for 14 days, the antioxidant abilities of rosemary or garlic extracts were evaluated and compared with those of butylated hydroxy toluene, ascorbyl palmitate, and α-tocopherol using peroxide value, conjugated dienoic acids, free fatty acid, thiobarbituric acid value analysis. The profile of volatiles, fatty acid composition, and the tocopherol contents in the treated and/or untreated oils were also determined. Active ingredients of rosemary and garlic extracts were also determined. Rosemary extract was found to provide higher oxidative stability than garlic extract after 14 days in most assays (e.g., the CDA values of 4.8% for rosemary extract and 5.2% for garlic extract in chia seed oil). The contents of γ-tocopherol, linoleic acid, and α-linolenic acid were well retained in the functional oils treated with the two extracts. After accelerated storage, the content of the major odor-active volatiles varied based on the type of oil. Our findings show the potential of natural aromatic plant extracts with respect to improving the oxidative stability of functional oils.
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Lee, Woo Jung,Choe, Jongwon,Ryu, Sunghyeon,Lim, Jeong Min,Kim, Myungwoong,Paeng, Keewook Elsevier 2018 THIN SOLID FILMS - Vol.668 No.-
<P><B>Abstract</B></P> <P>We examined the glass transition behaviors of a series of homopolymers and random copolymers, poly(methyl methacrylate) (PMMA), poly(ethyl methacrylate) (PEMA), and poly(methyl methacrylate-<I>random</I>-ethyl methacrylate) (P(MMA-<I>r</I>-EMA)), in films deposited by two conventionally employed methods, spin-coating and the Langmuir-Blodgett (LB) method, exhibiting uncontrolled and controlled chain conformations at the molecular level, using spectroscopic ellipsometry measurements. The processing parameters of the LB method (surface pressure, deposition rate, and number of deposited layers) were controlled and the films were compared with those made by spin-coating to gain a deeper understanding of how the glass transition temperature is affected by the processing conditions. Our results strongly suggest that the glass transition temperature of polymer films follows typical thermal behaviors of corresponding bulk samples, even though they are deposited using the LB method. The bulk glass transition temperature (T<SUB>g</SUB>) was controlled to further investigate how the deposition temperature affects the thermal properties of polymer films by adjusting the composition of P(MMA-<I>r</I>-EMA) random copolymers. The molecular layer by layer deposition using the LB method at temperatures ranging from 0.76 T<SUB>g</SUB> to 0.87 T<SUB>g</SUB>, where the small molecule glass films by physical vapor deposition have extraordinary high density, demonstrated glass transition behavior identical to that of the bulk samples. The thermal stability of the polymer films deposited using the LB method could not be compared to that of the small molecule films with similar deposition temperatures relative to T<SUB>g</SUB>, as the inevitable trapping of water molecules during LB deposition resulted in low density and high apparent fictive temperature of LB deposited films.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The glass transition (T<SUB>g</SUB>) of polymer film does not depend on deposition methods. </LI> <LI> Deposition parameters of Langmuir-Blodgett (LB) method does not alter T<SUB>g</SUB> of films. </LI> <LI> Deposition temperature relative to T<SUB>g</SUB> can be controlled by copolymerization. </LI> <LI> LB deposition resulted films with low density and high fictive temperature. </LI> </UL> </P>
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Kim, Il Ryong,Yoon, A-Mi,Lim, Hye Song,Lee, Sunghyeon,Lee, Jung Ro,Choi, Wonkyun National Institute of Ecology 2022 국립생태원회보(PNIE) Vol.3 No.4
DNA markers have been studied and used intensively to identify plant species based on molecular approaches. The genus Medicago belongs to the family Fabaceae and contains 87 species distributed from the Mediterranean to central Asia. Five species of Medicago are known to be distributed in South Korea; however, their morphological characteristics alone cannot distinguish the species. In this study, we analyzed the phylogenetic relationships using collected five species of Medicago from South Korea and 44 taxa nucleotide information from NCBI. The constructed phylogenetic tree using gibberellin 3-oxidase 1 and tRNA<sup>Lys</sup> (UUU) to maturase K gene sequences showed the monophyly of the genus Medicago, with five species each forming a single clade. These results suggest that there are five species of Medicago distributed in South Korea. In addition, we designed polymerase chain reaction primers for species-specific detection of Medicago by comparing the plastid sequences. The accuracy of the designed primer pairs was confirmed for each Medicago species. The findings of this study provide efficient and novel species identification methods for Medicago, which will assist in the identification of wild plants for the management of alien species and living modified organisms.
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