• Title/Summary/Keyword: internal ethylene concentration

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Suitability Judgment of Storage Conditions by Internal Gas Concentration of 'Fuji' Apples under CA Storage (CA저장 중 후지 사과의 내부 기체농도에 의한 저장조건의 적합성 판단)

  • Chung, Hun-Sik;Choi, Jong-Uck
    • Korean Journal of Food Science and Technology
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    • v.31 no.5
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    • pp.1295-1299
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    • 1999
  • This study was conducted to develop a index for the judgment of suitability of storage conditions by internal gas concentration of 'Fuji' apples under CA storage, and was examined the relationship between the levels of quality characteristics(flesh firmness, titratable acidity and surface green color) and the infernal ethylene and carbon dioxide concentrations of apples. The levels of quality characteristics were not decreased for terms of storage when the infernal ethylene concentration of apples was below 10 ppm, but the levels of quality characteristics were sharply decreased when it was above 10 ppm of Internal ethylene. The high levels of quality characteristics were maintained by the lower internal carbon dioxide concentration of apples, especially at below 2% of internal carbon dioxide. These result showed that the suitable condition for CA storage of 'Fuji' apples was a condition for having below 10 ppm of internal ethylene and below 2% of internal carbon dioxide in apples. The internal ethylene and carbon dioxide concentrations of apples during CA storage can be used as a crucial index for the suitability judgment of storage conditions.

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A Study on the storage of Fresh Fruits and Vegetables (Part II) Effects of Intercellular atmosphere and Ethylene evolution by control of external pressure and gas composition in Apple Fruits. (청과물 저장에 관한 연구(제 2보) -사과 저장에 있어서 환경압력 및 기체조성이 사과조직내 기체조성과 Ethylene 생성에 미치는 영향-)

  • 손태화;최종욱;서온수
    • Microbiology and Biotechnology Letters
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    • v.1 no.1
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    • pp.25-30
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    • 1973
  • Experiments were carried out to clarify changes of intercellular gas composition, respiration and ethylene evolution by controlled external atmospheric pressure and external gas composition on apples. Jonathan apples, harvested 25, in September and Rolls apples, harvested 25, in October, 1971 and 1972 were used. Results obtained were as follows: 1. Intercellular gas volumes were proportionally changed by the given pressure, and the given pressure remarkably affected internal gas composition and volume of apples. As intercellular gas volumes were reached in their equilibrium within 5 min. after treatment, the internal atmospheric conditions became constant rapidly. 2. The increase of internal $CO_2$ production was co-related with an amount of internal $O_2$ consumption, therefore, the decreasing period of internal $O_2$ consumption was equalled to the period of climacteric rise in respiration. 3. The increasing of $CO_2$ production followed evolution of $C_2$H$_4$ and this phenomenon on SAP part. was subsequent to NAP part 4. In sub-atmospheric storage, CA effect was also obtained by control of low $O_2$ and high $CO_2$ concentration.

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Preparation of Gemcitabine-Loaded Methoxy Poly(ethylene glycol)-b-Poly(L-lactide) Microparticles Using W/O/W Double Emulsion (W/O/W 다중유화법을 이용한 젬시타빈 함유 Methoxy Poly(ethylene glycol)-b-Poly(L-lactide) 미립자 제조)

  • Ryu, Jong-Hoon;Jung, In-Il;Lee, Ji-Eun;Lim, Gio-Bin
    • KSBB Journal
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    • v.26 no.4
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    • pp.333-340
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    • 2011
  • In this study, gemcitabine-loaded methoxy poly(ethylene glycol)-b-poly(L-lactide) (MPEG-PLLA) microparticles with different PEG block lengths were prepared by a W/O/W double emulsion technique. The present study focuses on the investigation of the influence of various preparative parameters such as the ratio of internal water phase and oil phase, polymer concentration, solvent composition of organic phase and salt concentration of external water phase on the morphology and encapsulation efficiency of the microparticles. The microparticles fabricated at high volume ratios of internal water phase to oil phase and at high polymer concentrations showed a relatively high encapsulation efficiency and low porosity. When a dichloromethane/ethyl acetate mixture was used as solvent, both the encapsulation efficiency and drug loading of the microparticles decreased as the level of ethyl acetate increased. The addition of a salt (NaCl) to the external water phase significantly improved the encapsulation efficiency up to 40%, and the microparticles became more spherical with their size and porosity decreased.

Activity test of post-reforming catalyst for removing the ethylene in diesel ATR reformate (디젤 자열개질 가스 내 포함된 $C_2H_4$ 제거를 위한 후개질기 촉매 활성 실험)

  • Yoon, Sang-Ho;Bae, Joong-Myeon;Lee, Sang-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.218-221
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    • 2009
  • Solid oxide fuel cells (SOFCs), as high-temperature fuel cells, have various advantages. In some merits of SOFCs, high temperature operation can lead to the capability for internal reforming, providing fuel flexibility. SOFCs can directly use CH4 and CO as fuels with sufficient steam feeds. However, hydrocarbons heavier than CH4, such as ethylene, ethane, and propane, induce carbon deposition on the Ni-based anodes of SOFCs. In the case of the ethylene steam reforming reaction on a Ni-based catalyst, the rate of carbon deposition is faster than among other hydrocarbons, even aromatics. In the reformates of heavy hydrocarbons (diesel, gasoline, kerosene and JP-8), the concentration of ethylene is usually higher than other low hydrocarbons such as methane, propane and butane. It is importatnt that ethylene in the reformate is removed for stlable operation of SOFCs. A new methodology, termed post-reforming was introduced for removing low hydrocarbons from the reformate gas stream. In this work, activity tests of some post-reforming catalysts, such as CGO-Ru, CGO-Ni, and CGO-Pt, are investigated. CGO-Pt catalyst is not good for removing ethylene due to low conversion of ethylene and low selectivity of ethylene dehydrogenation. The other hand, CGO-Ru and CGO-Ni catalysts show good ethylene conversion, and CGO-Ni catalyst shows the best reaction selectivity of ethylene dehydrogenation.

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Differences in Ethylene and Fruit Quality Attributes during Storage in New Apple Cultivars

  • Yoo, Jingi;Lee, Jinwook;Kwon, Soon-Il;Chung, Kyeong Ho;Lee, Dong Hoon;Choi, In Myung;Mattheis, James P.;Kang, In-Kyu
    • Horticultural Science & Technology
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    • v.34 no.2
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    • pp.257-268
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    • 2016
  • Physiological characteristics of five new apple cultivars from the Korean apple breeding program were evaluated as a function of harvest time and storage after harvest. Internal ethylene concentration (IEC), flesh firmness, soluble solids concentration (SSC), and titratable acidity (TA) were measured in 'Summer Dream', 'Summer King', 'Green Ball', 'Picnic', and 'Hwangok' apples at harvest, during shelf life at $20^{\circ}C$, and one day after cold storage at $0.5^{\circ}C$ in air. IEC increased during shelf life in 'Summer Dream', 'Summer King', and 'Green Ball' but not in 'Picnic' or 'Hwangok', regardless of harvest time. Flesh firmness decreased towards harvest time and decreased gradually with time in cold storage only in the former three cultivars. In turn, IEC increased during cold storage in the first three cultivars but not for the last two cultivars, irrespective of harvest time. Changes in SSC and TA did not consistently relate to harvest time or storage period but TA tended to decrease as IEC increased. Furthermore, IEC was negatively correlated with flesh firmness except in the 'Green Ball' cultivar but the significance level was much greater in 'Summer Dream' and 'Summer King' (p < 0.0001) than in 'Picnic' (p < 0.01) or 'Hwangok' (p < 0.05) cultivars. Flesh firmness was positively correlated with TA in the first three cultivars but not in the last two cultivars. Overall, the results indicate that cultivars for which IEC increased after harvest had reduced flesh firmness and TA after storage.

Effect of Photosynthesis on Ozone-Induced Ethylent Evolution from Tomato Plants (토마토 식물에 있어서 광합성이 유존유동성의 에틸렌 생성에 미치는 영향)

  • 배공영
    • Journal of Korean Society for Atmospheric Environment
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    • v.12 no.3
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    • pp.307-314
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    • 1996
  • The rate of evolution of ethylent by tomato plants was rapidly increased by ozone fumigation. In the present study, the mechanism of ethylent evolution by ozone was investigated in experiments with aminoethoxyvinylglycine (AVG) and tiron, which inhibit the formation of ethylene and peroxidation of lipids, respectively. Pretreatment with AVG significantly inhibited the ozone-induced ethylent evolution, but the treatment of plants with tiron did not inhibit. These results indicate that the induction of the evolution of ethylene by ozone involves the pathway via aminocyclopropane-1-carboxylate (ACC), while not released as a result of the peroxidation of lipids. Ozone-induced ethylent evolution was greater in dar- than light-incubated, intact tomato plants. The difference between dark- and light-ethylene evolution was examined with diuron, an inhibitor of photosynthetic electron transport. The inhibitor treatment promoted ethylent evolution. These results suggest that ethylent retention and metabolism in plants were regulated by internal $CO_2$ levels which, in turn, were controlled in large part by photosynthesis. Thus, ethylene was retained in illuminated leaf tissue under low intenal $CO_2$ concentration which may develop in a sealed container without exogenously supplied $CO_2$.

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Production of Ethylene and Carbon Dioxide in Apples during CA Stroage (사과의 CA저장 중 에틸렌 및 이산화탄소 생성)

  • 정헌식;최종욱
    • Food Science and Preservation
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    • v.6 no.2
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    • pp.153-160
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    • 1999
  • This study was carried out to investigate the production of C$_2$H$_4$ and CO$_2$, and the change of flesh firmness and peel color in 'Fuji' apples during CA storage. ACC oxidase activity was more inhibited by the low O$_2$ concentration, and the low level of internal C$_2$H$_4$ in apples was maintained under the low O$_2$ conditions during 8 months storage. Especially, the level of internal C$_2$H$_4$ in apples was maintained below 1 ppm during storage under 1% O$_2$+1% CO$_2$ at 0$^{\circ}C$, and not much changed for 7 days in air at 20$^{\circ}C$ after storage. The influence of CO$_2$ on the C$_2$H$_4$ production was dependent on the O$_2$ concentration. Increasing of CO$_2$ concentration with 3% O$_2$ decreased the C$_2$H$_4$ Production during storage, but that with 1% O$_2$increased. Internal C$_2$H$_4$ concentration and the rate of CO$_2$ evolution in apples showed the close correlation. Internal CO$_2$ concentration of apples was positively related to the rate of CO$_2$ evolution and maintained the lower level in 1% O$_2$+1% CO$_2$ than the other conditions during storage but nu different in the increment after storage. The relationship between C$_2$H$_4$ and CO$_2$ production was exhibited in CA and the short-term air stored apples, but not in the long-term air stored apples. Loss of flesh firmness and green color in apples was more less in storage condition retarded effectively the production of C$_2$H$_4$ and CO$_2$.

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A Study on the Storage of Fresh Fruits and Vegetables (I) -Changes of the Internal Atmosphere in Storage Room and the Biochemical Changes of Apple Fruits by Controlled Ventilation- (청과물 저장에 관한 연구(제1보) -통기량 조절에 따른 저장실내 기체조성 및 생리화학적 변화에 대하여-)

  • Sohn, Tae-Hwa;Choi, Jong-Uck;Kim, Sung-Dal
    • Korean Journal of Food Science and Technology
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    • v.4 no.1
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    • pp.13-17
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    • 1972
  • This experiment was conducted to observe the changes of composition of atmosphere in storage room by controlled ventilation under normal and sub-atmospheric conditions, and the biochemical changes in apple texture under these conditions. The results were as follows; 1) By controlled ventilation, concentration of carbon dioxide in storage room was optionally regulated and constantly maintained. 2) Among compositions of internal atmosphere of apple, especially, concentration of ethylene was much decreased at apple stored under sub-atmospheric condition than that stored under normal atmospheric condition. 3) Acidity of apple stored under sub-atmospheric condition was much greater than that of apple stored under normal atmospheric condition. 4) Respiratory quotients of apple, which was stored under normal and sub-atmospheric conditions, were shown to be high. But decarboxylation of added pyruvate was found more active in slices prepared from apple stored under sub-atmospheric condition.

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Morphology of EPDM-based Thermoplastic Vulcanizates (EPDM계 열가소성 가황체의 형태학적 연구)

  • Lee, Sang-Jin;Kim, Young-Kyoo;Park, Seong-Soo;Cho, Won-Jei;Ha, Chang-Sik
    • Elastomers and Composites
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    • v.32 no.3
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    • pp.157-165
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    • 1997
  • The morphology of the thermoplastic vulcanizates prepared from ethylene-propylene-diene terpolymer, polypropylene and high density polyethylene(HDPE) or ethylene based ionomer were studied. Blends were prepared in a laboratory internal mixer where EPDM was cured in the presence of PP and HDPE or ionomer under shear with dicumyl peroxide(DCP). The effects of DCP concentration and rubber/plastics composition were studied. In the morphological analysis by scanning electron microscopy (SEM), a small amount of EPDM acted as a compatibilizer to HDPE and PP. It was also revealed that the dynamic vulcanization process could reduce the domain size of the crosslinked EPDM phase. When ionomer was added to EPDM/PP blend, the thermoplastic vulcanizate showed typical ductile fracture topology and the trend was more clearly observed when DCP contents and ionomer contents are higher.

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Effect of Aminoethoxyvinylglycine Treatment on Lipid Material Changes in 'Hongro' Apples (Aminoethoxyvinylglycine 처리가 '홍로' 사과 표피의 지질물질 변화에 미치는 영향)

  • Jun, YoungKeun;Kang, InKyu;Choi, Cheol
    • Current Research on Agriculture and Life Sciences
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    • v.33 no.1
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    • pp.33-35
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    • 2015
  • This study investigated the effect of AVG treatment on lipid material changes in the 'Hongro' apple epidermis. The internal ethylene concentration in 'Hongro' apples treated with $200mL{\cdot}L^{-1}$ AVG and stored at room temperature after harvest was significantly lower than that in 'Hongro' apples treated with $20mL{\cdot}L^{-1}$ Ethephon and the controls. During the same period, the emission of wax after the AVG treatment was also significantly lower than that after the other treatments. In conclusion, treatment with $220mL{\cdot}L^{-1}$ AVG two weeks before harvesting was found to be effective in improving and maintaining the quality of the 'Hongro' apples. Reducing the level of internal ethylene can delay the aging of fruit and inhibit the accumulation of wax in the fruit epidermis.