계면활성제에 의해 유도되는 농약의 엽면 침투성 연구 현황

유주현(Ju Hyun Yu),조광연(Kwang Yun Cho),김정한(Jeong Han Kim) 한국농약과학회 2002 농약과학회지 Vol.6 No.1

농약,환경 : 왕겨를 가연성 담체로 하는 봉상 농약 훈연제의 연소성에 미치는 산화제의 영향

유주현 ( Ju Hyun Yu ),임희경 ( He Kyoung Lim ),김용환 ( Yong Whan Kim ),조광연 ( Kwang Yun Cho ) 한국응용생명화학회 2004 Applied Biological Chemistry (Appl Biol Chem) Vol.47 No.3

농약 살포작업의 생력화를 위한 투척처리용 점보제의 연구개발에 관하여

유주현,임희경,조광연 ( Ju Hyun Yu,He Kyoung Lim,Kwang Yun Cho ) 한국환경농학회 1996 한국환경농학회지 Vol.15 No.1

Recent development in Japan on jumbo formulation of pesticides for paddy application by hand throw was reviewed. In addition, the diffusion of liquid formulations in water was examined to establish the research strategy for the jumbo formulation. Research on jumbo formulation in Japan has been focused on gas-generating formulations and self-emulsifiable formulations. Although continuous efforts to minimize the problem of pesticide deposit on the treated site have been made for the gas-generating formulations, much work is still needed to establish a generally acceptable formulation method and to commercialize a herbicide formulation. The self-emulsifiable jumbo formulations have recently been investigated. These formulations could simply be processed and showed relatively high biological efficacy. The emulsifiable concentrate was more diffusible than the suspension concentrate in water. The diffusion of the emulsifiable concentrate was not greatly disturbed by floating obstacles. And the diffusion rate was high when the specific grabity was lower than one.

농약,환경 : 계면활성제를 이용한 역병과 오이 노균병 방제

최경자 ( Gyung Ja Choi ),유주현 ( Ju Hyun Yu ),장경수 ( Kyoung Soo Jang ),김흥태 ( Heung Tae Kim ),김진철 ( Jin Cheol Kim ),조광연 ( Kwang Yun Cho ) 한국응용생명화학회 2004 Applied Biological Chemistry (Appl Biol Chem) Vol.47 No.3

소형 비닐하우스 내에서 훈연처리된 살균제 Procymidone 의 분포 특성

유주현,조광연,임희경,김정한 한국농화학회 2001 Applied Biological Chemistry (Appl Biol Chem) Vol.44 No.1

The distribution of procymidone in a small vinyl house containing cucumber plants or mimic plants was investigated after application of smoke generator. The deposition of procymidone on glass plate and filter paper was significantly similar to that on cucumber leaves, so that glass plate and filter paper could be substituted for cucumber leaves on deposition studies. The deposition of procymidone was proportional to the horizontally projected area of surface; the deposition on the horizontal surface was maximal, and the deposition was minimal for the perpendicular surface. The amount of deposition on the backside of leaf was less than 5% compared to that on the horizontal surface of leaf. The height of leaf from the floor was not a significant factor influencing on the deposition of procymidone whether leaves were overlapped or not. However, the deposition of procymidone on the overlapped leaves was relatively less than that on the unoverlapped leaves. And the deposition difference depending on the distance between leaves was not observable. Overall, the deposition of procymidone was proportionally increased with the application rate of smoke generator, but the deposition was inversely related to the sum of the total horizontal leaf area of mimic plants and the surface area of floor.

계면활성제가 살균제 Dimethomorph 의 오이 엽면 침투성과 오이 노균병 방제 효과에 미치는 영향

유주현,조광연,김정한,임희경,최경자 한국농화학회 2001 Applied Biological Chemistry (Appl Biol Chem) Vol.44 No.2

The foliar uptake of dimethomorph induced by several nonionic surfactants was measured in order to study the correlations between the uptake rate of dimethomorph and the fungicidal activity to cucumber downy mildew. Dimethomorph was not absorbed in cucumber leaf in the absence of activator surfactant. And the curative effect of dimethomorph WP to cucumber downy mildew was very low under the concentration of 250 ㎍/㎖. But dimethomorph uptake was remarkably enhanced by addition of nonionic surfactants, such as polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, and polyoxyethylene stearyl ether. And the curative effect to cucumber downy mildew was enhanced with proportion to uptake rate of dimethomorph. The protective effect to cucumber downy mildew, however, tends to decrease with the increase of foliar uptake of dimethomorph.. The uptake rate of dimethomorph to cucumber leaf was proportional to the content of polyoxyethylene cetyl ether in formulation, but was decreased with dilution.

유용성 점결제를 이용한 수중용출지연입제의 제제

유주현,조광연,이병회 한국농화학회 1992 Applied Biological Chemistry (Appl Biol Chem) Vol.35 No.2

The technicals of KC-7079, isoprothiolane, perfluidone and tricyclazole were granulated with a mixture of inorganic carrier and oil-soluble binder, that is, stearly alcohol or ethyl cellulose. The concentration of the released active ingredient from the granules was analyzed at several days intervals after immersion of these granules in water at 25℃. At the content of stearyl alcohol less than 80g kg^(-1), the granule kneaded with stearyl alcohol mixture and water disintegrated in water. But the granule kneaded with methanol disintegrated in water at the content of stearyl alcohol less than 30g kg^(-1). The less the KC-7079-stearyl alcohol granule disintegrated, the slower the release rate of KC-7079 was. No matter how was increased the stearyl alcohol content, the release rate of KC-7079 granule which did not disintegrate was not significantly changed. The sustained releasing effect of the granules was little in the other three pesticides of which the water solubility was higher than of KC-7079(21 ppm). The granule made of ethyl cellulose did not disintegrate even at 5g ㎏^(-1) of ethyl cellulose. With the increase of ethyl cellulose content and the decrease of active ingredient in the granules, the sustaining effect of the granules on releasing acitive ingredient was increased. The lower the water solubility of pesticide was, the release rate tended to be sustained except perfluidone.

계면활성제(界面活性劑)의 약해유발농도와 그 증상

유주현,조광연,구석진 한국환경농학회 1989 한국환경농학회지 Vol.8 No.2

1) 모든 처리에서 공히 가장 낮은 농도에서 약해를 유발한 계면활성제는 LE, NP, LN, SDSS, PAAS 및 DBC였으며, Tween, Span, SP, SC, STPP 및 CLIS 등은 고농도에서 약해유발이 가장 적었다. 2) 논담수상태에서는 음이온계면활성제가 비이온 계면활성제보다 낮은 농도에서 약해를 유발하였으나 그밖의 처리에서는 거의 유사한 경향이었다. 3) 벼와 피는 약해에 있어서 거의 동일한 반응을 보였으며 각 초종간에 반응의 차이는 거의 없었다. 4) 밭상태와 건답상태의 발아전 처리에서는 10%이상의 고농도 시료에서도 약해유발이 매우 적었으나 논담수상태의 발아전 처리에서는 모든 처리중 가장 낮은 농도에서 약해가 유발되 었다. The minimum concentrations of nonionic and anionic surfactants inducing phytotoxicity were investigated after spraying or flooding surfactant solutions to annual plants. Of the sufactants tested, LE, NP, SPSS, LN, PAAS and DBC induced phytotoxicity at the lowest concentrations through all treatments and Tween, Span, SP, SC, STPP and CLIS induced the least phytotoxicity even at high concentration. At flooded paddy field tests, anionic surfactants induced phytotoxicity at the lower concentration than nonionic, but showed similar tendencies with other treatments. In pre-emergence treatments of upland and dry paddy field tests, there was little phytotoxicity induced at over 10 percent, while phytotoxicity was induced at the lowest concentration among 6 treatments in flooded paddy field tests.

유기용매의 약해유발 농도와 그 증상(症狀)

유주현,김진석,조광연 한국농화학회 1989 Applied Biological Chemistry (Appl Biol Chem) Vol.32 No.3

The minimum concentrations of organic solvents inducing phytotoxicity were investigated after spraying or flooding solvent solutions to annual plants. In the foliar treatment of upland test, solvents with high-boiling point or low-polarity induced severe phytotoxicity. Especially, aromatic solvents induced severe phytotoxicity. The most sensitive plant to phytotoxicity was soybean. In the pre-emergence treatment of upland test, the solvents with high-boiling point only induced phytotoxicity at high concentration. The degree of phytotoxicity induced by foliar spray in the condition of paddy field was similiar to that of upland test, but in the pre-emergence test, the former was more severe than the latter. Among 6 treatments, phytotoxicity induced by solvents was most severe in the pre-emergence test under the condition of flooding paddy field. Generally, alcohols induced severe phytotoxicity, especially, ethanol at 0.001%.

제초제 스크리닝을 위한 계면활성제 - 아세톤 수용액의 용매성 , 전착성 및 약해

유주현,조광연 한국환경농학회 1995 한국환경농학회지 Vol.14 No.3

약제, 계면활성제, 수용성 유기용매, 증류수의 조성을 가지는 농약스크리닝용 약제용액중에서 각 성분들의 역할을 명확히 이해하는 동시에 약제용액에 보다 우수한 성질을 부여할 수 있는 계면활성제를 선발하기 위하여 Tween 20을 포함한 6종의 비이온성 계면활성제 수용액의 제초제 원제 18종에 대한 용매성, 벼와 콩에 대한 전착력 및 약해를 시험하고 평가하였다. 제초제 원제에 대한 계면활성제-아세톤 수용액의 용매성은 아세톤의 첨가비에 의존하였으며, 이에 대한 비이온 계면활성제의 역할은 미미하였다. 시험한 계면활성제중 polyoxyethylene nonylphenyl ether HLB 16.0(NP-16.0)을 함유하는 아세톤 수용액이 약간 더 양호한 용매성을 보였다. 콩잎에 대한 전착력은 모든 계면활성제 수용액이 고르게 양호하였으나, 벼에 대한 전착력은 polyoxyethylene lauryl ether HLB 13.6(LE-13.6)를 함유하는 아세톤 수용액만이 양호하였다. 대부분의 계면활성제 수용액이 벼에 대해서는 약해를 유발하지 않았으나, 콩잎에 대해서는 Tween 20 0.1%, LE-13.6 0.01% 및 NP-16.0 0.01% 수용액만이 약해를 유발하지 않았다. 약제에 대한 유화성, 식물체에 대한 전착력 및 약해 안전성을 모두 만족시킬 수 있는 계면활성제는 찾지 못하였으나 시험한 계면활성제중에서는 LE-13.6이 가장 적당하였다. For studying the role of acetone and surfactant in solution, and selecting the best surfactant for spray solution in herbicide screening, the solubilizability of 6 nonionic surfactant-acetone aqueous solutions to 18 herbicide technicals, their foliar wettability and phytotoxicity to soybean and rice plant were tested and evaluated. The solubilizability of surfactant-acetone aqueous solutions to herbicide technicals was dependent on the acetone content of solutions, and was less affected by nonionic surfactant. Foliar wettability of the surfactant solutions was good to soybean, but only polyoxyethylene lauryl ether HLB 13.6(LE-13.6) solution showed good wettability to rice plant within the concentration range of no phytotoxicity. Tween 20(0.1 %), LE-13.6(0.01 %) and polyoxyethylene nonylphenyl ether HLB 16.0(0.01 %) solutions didn't induce phytotoxicity to soybean, and most of the surfactant solutions didn't induce phytotoxicity to rice plant. There was no surfactant that showed superior emulsifiability to various herbicide technicals, good foliar wettability to plants, and no phytotoxicity, but LE-13.6 was better than others.