• Title, Summary, Keyword: Pyrethroids

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Sorption Isotherms and KocS Estimation of Pyrethroids in Sediments

  • Lee, Sang-Jin;Shin, Hyun-Moo
    • Journal of Environmental Science International
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    • v.12 no.11
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    • pp.1173-1179
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    • 2003
  • Laboratory sorption isotherm batch studies have been attempted to elucidate interaction of synthetic pyrethroids (bifenthrin and permethrin) with sediments and their fractions. As a nonlinear isothermal model, the Freundlich equation was applied to sorption results obtained from sediments to investigate the relationship between synthetic pyrethroids and sediments containing different amounts of organic carbon. Results demonstrated that the sorption capabilities of bifenthrin and cis- and trans-permethrin was in the order of bifenthrin, cis-permethrin and trans-permethrin, respectively, indicating that adsorbed bifenthrin was the most stable followed by cis- and trans-permethrin in all sediments. Their sorption capability was closely related to organic carbon contents in sediments. Higher sorption was observed in sediments containing higher organic carbon contents. Sorption study extended into the fractions, clay and humic acids, extracted from a sediment, indicated that higher sorption capacity in humic acids occurred than in the clay of both examined bifenthrin and permethrin. This study demonstrates the sorption of synthetic pyrethroids with sediments, and will help in the understanding of the transport and fate of synthetic pyrethroids existing in field sediments.

Resistance of Diamondback Moth(Plutella xylostella L.) against the Pyrethroids (피레스로이드제에 대한 배추좀나방의 포장약제저항성의 변동)

  • 송승석
    • Korean journal of applied entomology
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    • v.31 no.4
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    • pp.338-344
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    • 1992
  • This test has been carried out to clear the effectiveness of pyrethroid insecticides to the Diamond back moth, that was complained by a farmer. The results obtained are summarized as follows. Effectiveness of Pyrethroids to suceptable strain and the results of chemical anaysis on the ingredients of pyrethroikds were normal at recommended concentrations. The effect ualue of pyrethroid by which the blocks were only one time treated was 57-59%, whereas the blocks sprayed 4 consecutive times of pyrethroid didn't show any effectiveness as shown in larval increasing rate of 489-552%. Among the results of field test conducted from 1990 to 1991 at 7 area, Dae Gu area showed the highest Effectiveness as 95-98%. However, Pyong Taek area, showed the least effectiveness as 0% in effect value. The resistant population which was collected at Tae kwan Ryung area was resurrected susceptability as much as JMC, in case of Placing it in non-treatment environment, whereas the pupulation which was revealed to pyrethroids for 6 genetations showed as much as 341-544 times of resistance compared with JMC. The non-effectiveness of pyrethroids to Diamondback moth which was complainted by a certain farmer named Mr Ju, was clearly resulted by the development of insect resistance. In Korea, the resistance of Diamondback moth to pyrethroids has developed in some area, as well as the resistance of pyrethroids has developed according to the continuous use of Insecticides, and the susceptability resurrected by stopping the use of pyrethroids. The result from this test would suggest that the pyrethroid insecticides should be applied in turb with other insecticides.

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Distribution of Pyrethroid Insecticides in a Nursery Drainage Channel

  • Lee, Sang-Jin;Shin, Hyun-Moo
    • Journal of Environmental Science International
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    • v.12 no.8
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    • pp.891-896
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    • 2003
  • The objectives of this study wre to investigate the effects of two synthetic pyrethroids, bifenthrin(BF) and permethrin(PM), in runoff and to evaluate the effects of suspended solids (SS) in the transport of pyrethroid along the drainage channel. Monitoring of BF and PM was conducted with the runoffs as well as in sediments existing along the drainage channel at a nursery site located in southern California, USA. This study also suggests Best Management Practices (BMPs) to alleviage the pollution caused by heavy usage of pyrethroid insecticides at nursery sites. Due to a high affinity to solid particles of pyrethroid insecticides, the concentrations of BF and PM were proportional to the SS contents along the drainage channel. This study suggests that alleviation of pyrethroids existing in runoffs could be controlled by the removal of suspended solids in runoffs and potential implications of current drainage channels for mitigation of pesticides associated with runoffs.

Estrogenic Activities of Pyrethroid Compounds in MCF-7 BUS cells

  • Han, Soon-Young;Shin, Hae-Ho;Kang, Il-Hyun;Kim, In-Young;Kim, Hyung-Sik;Lee, Su-Jung;Moon, Hyun-Ju;Kim, Tae-Sung;Moon, A-Ree;Choi, Kwang-Sik
    • Proceedings of the PSK Conference
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    • pp.293.1-293
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    • 2002
  • Pyrethroids are extensively used as insecticide in agriculture and home. Several studies have reported that yrethroids are relatively safe to humans and wildlife. However. some studies have suggested that pyrethroids ossess estrogen-like activity. Thus. the purpose of this study was to investigate the effects of pyrethroid ompounds on cell proliferation. and expression of ERs and pS2 using estrogen receptor positive human breast ancer cell line (MCF-7 BUS celis). (omitted)

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Investigation of potential estrogenic activity of bioallethrin in vitro and in vivo assays

  • Kim, Soon-Sun;Rhee, Gyu-Seek;Lee, Rhee;Kwack, Seung-Jun;Lim, Kwon-Jo;Park, Chul-Hoon;Lee, Geun-Shik;Jeung, Eui-Bae;Kil, Kwang-Sup
    • Proceedings of the PSK Conference
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    • pp.173.2-174
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    • 2003
  • Many pesticides possess hormonal activity and have been thus classified as endocrine disruptors. Bioallethrin is one of the pyrethroids. synthetic derivatives of naturally occurring pyrethrins. These pyrethroids including bioallethrin have been developed as insectides due to their high insecticidal potency and low mammalian toxicity. Currently, bioallethrin is used to eradicate pests and insects in Korea, providing potential for human exposure. (omitted)

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Reduction of Pesticide Residues in the Production of Red Pepper Powder

  • Chun, Mi-Hwa;Lee, Mi-Gyung
    • Food Science and Biotechnology
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    • v.15 no.1
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    • pp.57-62
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    • 2006
  • Six organophosphorus, one organochlorine, and three synthetic pyrethroid pesticides were analyzed for their residues during washing and hot-air drying of red peppers conducted in the production of powder. The residue ratio in organophosphorus pesticides was 33% in chlorpyrifos, 31 % in diazinon, 50% in methidathion, 80% in EPN, 28% in fenitrothion, and 60% in profenofos. The ratio in pyrethroids was 109% in cypermethrin, 102% in deltamethrin, and 106% in fenvalerate. That in organochlorine was 56% in ${\alpha}$-endosulfan and 90% in ${\beta}$-endosulfan. The results were greatly different between organophosphorus and pyrethroid pesticides. UV irradiation along with hot-air drying brought about a remarkable reduction of the residues, up to 70% as compared with hot-air drying only. The removal effect was most remarkable in pyrethroids, which are hardly removed by hot-air drying. The color of the pepper was not changed during UV irradiation. The use of oxidizing agents such as hydrogen peroxide or chlorine dioxide during washing did not show a remarkable removal of residues. The residue ratio was not affected whether the pesticide is contaminated artificially or naturally.

Estrogenic and Antiestrogenic Insecticides in MCF7-BUS Cell Line (피레스로이드계 살충제의 MCF7-BUS세포에 대한 에스트로겐 및 항에스트로겐 효과)

  • 오승민;정규혁
    • YAKHAK HOEJI
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    • v.45 no.6
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    • pp.694-700
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    • 2001
  • Synthetic pyrethroids are analysis of a natural chemical moiety, pyrethrin derived from the pyrethrum plant Chrysanthemum. The natural pyrethrin structure has been modified to be highly lipophilic and photostable, creating an effective pesticide and resulting in an increased presence in the environment. Worldwide, they are commonly used insecticides against ticks, mites, mosquitoes, and as treatment for human head lice and scabies. Therefore, human exposure to their compounds in extensive. Several studies on the effects of pyrethroids on thyroid hormone regulation, estrogen and androgen function have been reported and yet little has been done try assess their potential hormonal activities. Among humans, a pyrethroid compound was suggested to be the causal agent for gynecomastia in a group of Haitian men. The reports suggest that some pyrethroid compounds are capable of disrupting endocrine function. Therefore, we examined estrogenic/antiestrogenic potential of three pyrethroid insecticides, that is permethrin, allethrin and fenvalerate in human breast cancer cell and action mechanism mediated by the estrogen receptor. Fenvalerate showed weak estrogenic activity but aallethrin and permethrin showed no effect. In combination with high levels (10$^{-10}$ M, 10$^{-11}$ M) of 17$\beta$-estradiol and three synthetic pyrethroids inhibited cert proliferations in MCF7-BUS cell by 17$\beta$-estradiol. Whereas, fenvalerate increased cell proliferative activity at lower level of estradiol (10$^{-12}$ M, 10$^{-13}$ M). The relative affinities to the estrogen receptor were observed by allethrin and permethrin treatment, but not by fenvalerate. These results indicated that some of pyrethroid insecticides may modulate estrogen functions in human breast cancer cell. The action mechanisms of estrogen receptor mediated antiestrogenicity by allethrin and permethrin were postulated.

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Toxicological and Electrophysiological Activities of Pyrethroids between Larvae of Diamondback Moth, plutella xylostella and Beet Armyworm, Spodoptera exigua (배추좀나방과 파밤나방의 pyrethroids약제에 대한 감수성 및 전기적 신경 반응 비교)

  • Ham, Sun-Hee;Ahn, Hee-Geun;Yang, Jeong-Oh;Yoon, Chang-Mann;Kim, Gil-Hah
    • The Korean Journal of Pesticide Science
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    • v.13 no.3
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    • pp.197-202
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    • 2009
  • Based on the insecticidal efficacy by insecticide treatment methods, neurophysiological responses were compared with the larvae of diamondback moth (DBM) and beet armyworm (BAW) using pyrethroids working on nervous system. By body spray method, all pyrethroids were showed lower insecticidal activity below 50% on the larvae of DBM and BAW. By leaf dipping method, DBM larvae were showed the insecticidal activity as 100% at 50 ppm deltamethrin, 80.0% at fenvalervate and 63.3% at permethrin. However, BAW larvae were showed lower insecticidal activity as similar as control in all concentration. In order to examine electrophysiological response on nervous system on DBM and BAW larvae when treated three insecticides, we investigated the voltage and reaction degree. The voltage of DBM were responded as high as $10^{-7}M$ in deltamethrin, $10^{-5}M$ in fenvalerate and $10^{-3}M$ in permethrin. However, those of BAW were showed dull responses with small variation of voltage to all three insecticides.