Radiation- and photo-induced degradation of five isomers of 1,2,3,4,5,6-hexachlorocyclohexane.

Hamada, Masayuki; Kawano, Eiko; Kawamura, Shunichi; Shiro, Motoo

doi:10.1271/bbb1961.45.659

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…A similar study was performed by Hamada et al (1981) with a 1500 ppm 2-propanol solution irradiated at 10 kGy at a dose rate of 5 kGy/h. The degradation yield was 2.4 X 10'4 (mol L_1)/kGy.…”

Section: Mechanisms and Parameters Involved In Radiation-induced Degr...mentioning

confidence: 97%

Effects of ionizing radiation on pesticides in a food irradiation perspective: a bibliographic review

Lépine¹

1991

J. Agric. Food Chem.

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Section: Mechanisms and Parameters Involved In Radiation-induced Degr...mentioning

confidence: 97%

Effects of ionizing radiation on pesticides in a food irradiation perspective: a bibliographic review

Lépine¹

1991

J. Agric. Food Chem.

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“…The reaction mixture was incubated for 10 min prior to read absorbance at 405 nm. Also, inhibition tests were done using E-64 [E-(L-transepoxysuccinyl-leucylamido (4-guanidino)butane; Sigma-Aldrich, E3132)] (0.01 mM; Hamada et al, 1981).…”

Section: Cysteine Proteinase Assaymentioning

confidence: 99%

Determination of digestive proteolytic profile in the larvae of Dyspessa palidata (Staudinger) (Lepidoptera: Cossidae)

Mardani-Talaee

Zibaee

2015

J Entomol Acarol Res

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Digestive proteolytic profile was determined in the larvae of Dyspessa palidata (Staudinger), which is the most important pest of Alliaceae in Europe and Iran. Compartmentalisation of the proteolytic activities by considering soluble and membrane-bound fractions revealed that soluble fractions of the whole midgut preparations had higher general proteolytic activity than membrane-bound fractions. Also, four proteolytic bands were observed in the soluble fraction of the total midgut preparation in electrophoresis. Compartmentalisation of the specific proteases revealed presence of trypsin, elastase, aminoand carboxy peptidases in posterior midgut but the highest activities of other proteases were found in anterior midgut. The highest activity of general protease was found at pHs of 6 and 8. Also, pH dependency of trypsin, chymotrypsin and elastase were found at values of 8, 7-8 and 9 but cathepsins had the optimal pH at 6. Exopeptidases showed the optimal value at pH of 7 although carboxypeptidase showed same activity at values of 6 and 7. The inhibitory concentrations 50% (IC50) of AEBSF.HCL on trypsin, chymotrypsin and elastase proteases were found to be 3.69, 3.31 and 4.09 mM, respectively. IC50 concentrations of TLCK, SBTI and TPCK significantly inhibited trypsin and chymotrypsin activities. IC50 of E-64 were 3.67 and 4.16 mM on cathepsin B and L but cystatin revealed 5.22 and 4.48 mM concentrations on cathepsin B and L, respectively. EDTA and phenathroline as metalloproteinase inhibitors had IC50 of 3.25 and 3.91 mM on general proteolytic activity. Results of the current study revealed larvae of D. palidata utilised different proteases to increase digestive efficiency when they fed on the host plants containing several toxic molecules.

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“…In the previous studies [6][7], the dependence was found for the γ-HCH (γ-hexachlorocyclohexane) degradation degree in 2-propanol on irradiation dose rate, as well as the influence of dose rate was revealed not only on quantitative but also qualitative composition of the DDT (dichlorodiphenyltrichloroethane) radiolysis products. We also studied this relationship on the example of various OCPs (α-, γ-HCH, DDT and DDE (dichlorodiphenyltrichloroethylene)) in solutions at the concentration of 0.100 (1.00) μg/ml in hexane and 2-propanol [8].…”

mentioning

confidence: 95%

Study of the Effect of Radiation Dose Rate on the Stability of Various Organochlorine Pesticides

Polyakova¹,

Мельникова²,

Oudalova³

et al. 2018

KEn

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The radiolysis of organochlorinated pesticides (OCP) is studied in dilute solutions irradiated at dose of 10 kGy with dose rate varied from 8.3 ⋅ 10 −3 up to 2.33 Gy/sec.It is found that the shape of the degradation degree relationship on dose rate is similar for different OCPs in polar and non-polar solvents (hexane, 2-propanol) and does not depend on the concentration of initial substance. The maximum of the OCP degradation degree is registered in the dose rate range of 0.23-0.43 Gy/sec.A lognormal distribution is considered as a function best fitting the experimental data. The OCP degradation mechanism could be explained by the ratio of active and recombined particles along the gradient of ionizing radiation intensity. Keywords

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Radiation- and photo-induced degradation of five isomers of 1,2,3,4,5,6-hexachlorocyclohexane.

Cited by 5 publications

References 3 publications

Effects of ionizing radiation on pesticides in a food irradiation perspective: a bibliographic review

Effects of ionizing radiation on pesticides in a food irradiation perspective: a bibliographic review

Determination of digestive proteolytic profile in the larvae of Dyspessa palidata (Staudinger) (Lepidoptera: Cossidae)

Study of the Effect of Radiation Dose Rate on the Stability of Various Organochlorine Pesticides

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