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<br />Furthermore, persistent studies with fish and Daphnia had been performed. For the toxicity to aquatic vegetation, no guideline examine is on the market. However, taking into account the available research for toxicity to aquatic plants, the NOEC for algae could be assumed to be larger than that for Daphnia magna. Exposure to resorcinol by means of peeling brokers presents an acute exposure scenario where the person is uncovered to a excessive focus 7. Acute results have been described underneath these situations.<br /><br /><h5></h5><br />Determination of resorcinol conjugates within the h urine samples after 14 days of steady product remedy showed that a maximal 23 mg 2. Assuming a physique weight of sixty four kg IPCS, offers an exposure estimate of zero. In a report based on client research knowledge Gans, , under reasonable maximum-use situations i.<br /><br /><h4></h4><br />Especially in rats, lengthy-term perturbations of the pituitary—thyroid axis attributable to xenobiotics or physiological alterations e. For the thyroid, a non-statistically important improve in TSH ranges was reported for interim males, but not at scheduled necropsy. In excessive-dosed females, T three ranges have been elevated, whereas there was no impact on T three or T 4 ranges in males.<br /><br /><h1></h1><br /><br /><ul><br />  <br />  <br />  <br /> <li>Resorcinol brought on no adverse effects in a number of reproduction and developmental toxicity studies in rats and rabbits.</li><br />  <br />  <br />  <br /> <li>It has been instructed that thyroid results appear to be depending on an administration route that allows for continued systemic publicity e.</li><br />  <br />  <br />  <br /> <li>The microscopic examination of the thyroid gave minimal changes follicular hyperplasia , which have been statistically not vital between controls and individual dose teams RTF, In vitro studies have been performed to assess the consequences of resorcinol on thyroid perform.</li><br />  <br />  <br />  <br /> <li>In high-dosed females, T three ranges have been increased, whereas there was no effect on T three or T four ranges in males.</li><br />  <br />  <br />  <br /> <li>Overall, the studies are not sufficient for a statistical extrapolation method according to the EU Technical Guidance Document EC, a.</li><br />  <br />  <br />  <br /> <li>Biological observations were carried out every day.</li><br />  <br />  <br />  <br /> <li>However, there are species differences within the susceptibility to goitrogens.</li><br />  <br /> <br /> <br /></ul><br />There were no revealed animal studies displaying thyroidal effects with a dose—response relationship that could be used for a tolerable consumption. In the body of a full life cycle toxicity check OECD TG , Lima noticed no opposed effects after 48 h of publicity at the highest focus tested, 0. Furthermore, Cronin et al. The fish and pond snails have been placed instantly into the aquaria, while the remaining 5 species were segregated in different baskets and suspended in the aquaria. The only investigation into this finish-point is that from the dose range-finding examine reported in sections 8.<br /><br /><h2></h2><br />Thyroid glands from all surviving F zero parents had been examined microscopically, and mind measurements were performed on all uncovered F 1 pups and people F 1 pups selected for behavioural testing. There have been no vital intercourse variations. In females, a greater proportion was excreted as sulfate conjugate, whereas males excreted a higher proportion of a diconjugate each sulfate and glucuronide teams. From these data, the authors concluded that male rats have a better capacity for glucuronidation than females.<br />From the scarce information out there, using resorcinol in hair dyes 0. The use of anti-acne cream is taken as the scenario of most concern due to the probability of steady publicity.<br /><br />Although thyroid results are a big end-level in each human case-research and animal studies, there is a lack of consistency in the ends in the animal studies. Resorcinol caused no adverse results in several reproduction and developmental toxicity studies in rats and rabbits. Resorcinol isn't considered to be genotoxic.
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<br />A concentration of 0. These substances had been discovered to be potent inhibitors of thyroid peroxidase or I organification. Resorcinol in addition to 2- and 5-methylresorcinol have been reported to be At an iodide concentration of 0.<br />Resorcinol is thought to kind covalent bonds with haem Sessler et al. Effects on the thyroid gland have been reported both in animal research and in case-reviews in humans. However, there are species differences within the susceptibility to goitrogens.<br /><br /><h2></h2><br />Furthermore, persistent research with fish and Daphnia were conducted. For the toxicity to aquatic vegetation, no guideline study is available. However, bearing in mind the out there research for toxicity to aquatic vegetation, the NOEC for algae may be assumed to be larger than that for Daphnia magna. Exposure to resorcinol by means of peeling agents presents an acute publicity scenario the place the individual is uncovered to a high concentration 7. Acute effects have been described underneath these conditions.<br />As is well-known in dermal absorption research, the nature of the vehicle has an excellent affect on the absorption of a compound. Resorcinol seems to be absorbed much better from anti-acne preparations than from the hair dye preparations beneath normal usage conditions.<br /><br />Complete recovery in all animals occurred inside 1—1. Of the next studies, the repeated-dose toxicity research that had been deemed to be most relevant to the risk assessment are summarized in Appendix 6. In a research performed by NTP , 5 male and female F rats had been dosed with resorcinol in deionized water through gavage at 0, High-dose females had considerably decreased absolute and relative thymus weights. No other biologically vital differences in organ weights had been noticed. In distinction to these findings, Eastin et al.<br />Two long-term studies with Swiss mice or NZW rabbits, where the animals were treated with zero. In an in vitro. In an investigation in three human volunteers using circumstances similar to those utilized in hair dyeing, 14 C-ring-labelled 1. This means that solely a small quantity of resorcinol penetrates the pores and skin during the precise process of hair colouring.<br /><br /><h3></h3><br /><br /><ul><br />  <br />  <br />  <br /> <li>There were no printed animal studies exhibiting thyroidal effects with a dose—response relationship that might be used for a tolerable intake.</li><br />  <br />  <br />  <br /> <li>Five of 3.</li><br />  <br />  <br />  <br /> <li>The third study, carried out in , included of lively employees.</li><br />  <br />  <br />  <br /> <li>However, these compartments are much less related for resorcinol, because of marginal releases and emissions to those compartments as well as a really low potential for adsorption of resorcinol to organic matter.</li><br />  <br />  <br />  <br /> <li>UV irradiation caused no elevated skin reactions.</li><br />  <br />  <br />  <br /> <li>The use of anti-zits cream is taken because the scenario of most concern because of the chance of continuous publicity.</li><br />  <br /> <br /> <br /></ul><br />In each species, there were no adverse results on ultimate mean body weights, haematology, or clinical chemistry parameters, and no chemical-related gross or microscopic lesions have been observed. In one other examine, rats had been exposed to 0 or zero. No thyroid hormone measurements have been carried out.<br />The elimination was biphasic, with half-lives of 18—21 min and 8. The 14 C activity was rapidly distributed in major tissues similar to muscles, kidneys, and liver, without indication of bioaccumulation Merker et al. Any new information being provided in the midst of the OECD evaluation shall be offered to the IPCS in order that an addendum could be prepared for consideration.<br /><br />Fifty per cent of survivors were sacrificed 1 week later, and blood and urine samples had been taken. Resorcinol confirmed a concentration-dependent increase in labelling index [ three H]thymidine , acanthosis, and papillomatosis. After application of an ointment containing To study the goitrogenic exercise of resorcinol, female Wistar rats have been handled twice daily for 28 days by rubbing 6 g of an ointment containing Increased thyroid gland weights 2.<br />The bulk of the urine-recovered dye will need to have been taken up into the horny layer of the pores and skin after which slowly released into the circulation. A cumulative 4-day absorption assuming cm 2 of scalp was given as 0.<br /><br /><h1></h1><br />The third examine, carried out in , included of active staff. In topics males, 13 ladies with a mean age of 37 years, each laboratory and different exams, together with medical examination, have been done; no irregular thyroid glands or adjustments in T four values have been present in any of the themes when compared with regular values Bauer, The above information are restricted because of small examine sizes, lack of comparison groups, lacking present and historic management data, and missing info concerning potential exposure classes. In a study in a plant producing resorcinol by sulfonation of benzene — and also producing beta -resorcylic acid, resorcinol—formaldehyde resins, sulfites, and sulfates — staff had been uncovered primarily to resorcinol, however the exposure to different agents was not measured for publicity levels, see section 6. In this plant, three cross-sectional studies were carried out between and Flickinger, In , medical examinations, chest X-rays, pulmonary function, haematology, and scientific chemistry were carried out with of persons actively employed at a manufacturing plant in Pennsylvania, USA. In addition, male rats have higher circulating levels of TSH than females.<br />Although thyroid results are a big finish-point in each human case-studies and animal studies, there is a lack of consistency in the leads to the animal research. Resorcinol triggered no opposed results in several reproduction and developmental toxicity research in rats and rabbits. Resorcinol just isn't thought-about to be genotoxic.<br />Animals had been maintained for several months with periodic sacrifices Flickinger, The animals were then examined weekly for 10 extra weeks. Sacrificed animals confirmed brown-dyed abdomen walls and filling of abdomen and small gut with a darkish-brown to orange substance. These findings weren't noted in survivors.

Revision as of 19:08, 28 March 2020


A concentration of 0. These substances had been discovered to be potent inhibitors of thyroid peroxidase or I organification. Resorcinol in addition to 2- and 5-methylresorcinol have been reported to be At an iodide concentration of 0.
Resorcinol is thought to kind covalent bonds with haem Sessler et al. Effects on the thyroid gland have been reported both in animal research and in case-reviews in humans. However, there are species differences within the susceptibility to goitrogens.


Furthermore, persistent research with fish and Daphnia were conducted. For the toxicity to aquatic vegetation, no guideline study is available. However, bearing in mind the out there research for toxicity to aquatic vegetation, the NOEC for algae may be assumed to be larger than that for Daphnia magna. Exposure to resorcinol by means of peeling agents presents an acute publicity scenario the place the individual is uncovered to a high concentration 7. Acute effects have been described underneath these conditions.
As is well-known in dermal absorption research, the nature of the vehicle has an excellent affect on the absorption of a compound. Resorcinol seems to be absorbed much better from anti-acne preparations than from the hair dye preparations beneath normal usage conditions.

Complete recovery in all animals occurred inside 1—1. Of the next studies, the repeated-dose toxicity research that had been deemed to be most relevant to the risk assessment are summarized in Appendix 6. In a research performed by NTP , 5 male and female F rats had been dosed with resorcinol in deionized water through gavage at 0, High-dose females had considerably decreased absolute and relative thymus weights. No other biologically vital differences in organ weights had been noticed. In distinction to these findings, Eastin et al.
Two long-term studies with Swiss mice or NZW rabbits, where the animals were treated with zero. In an in vitro. In an investigation in three human volunteers using circumstances similar to those utilized in hair dyeing, 14 C-ring-labelled 1. This means that solely a small quantity of resorcinol penetrates the pores and skin during the precise process of hair colouring.







  • There were no printed animal studies exhibiting thyroidal effects with a dose—response relationship that might be used for a tolerable intake.




  • Five of 3.




  • The third study, carried out in , included of lively employees.




  • However, these compartments are much less related for resorcinol, because of marginal releases and emissions to those compartments as well as a really low potential for adsorption of resorcinol to organic matter.




  • UV irradiation caused no elevated skin reactions.




  • The use of anti-zits cream is taken because the scenario of most concern because of the chance of continuous publicity.





In each species, there were no adverse results on ultimate mean body weights, haematology, or clinical chemistry parameters, and no chemical-related gross or microscopic lesions have been observed. In one other examine, rats had been exposed to 0 or zero. No thyroid hormone measurements have been carried out.
The elimination was biphasic, with half-lives of 18—21 min and 8. The 14 C activity was rapidly distributed in major tissues similar to muscles, kidneys, and liver, without indication of bioaccumulation Merker et al. Any new information being provided in the midst of the OECD evaluation shall be offered to the IPCS in order that an addendum could be prepared for consideration.

Fifty per cent of survivors were sacrificed 1 week later, and blood and urine samples had been taken. Resorcinol confirmed a concentration-dependent increase in labelling index [ three H]thymidine , acanthosis, and papillomatosis. After application of an ointment containing To study the goitrogenic exercise of resorcinol, female Wistar rats have been handled twice daily for 28 days by rubbing 6 g of an ointment containing Increased thyroid gland weights 2.
The bulk of the urine-recovered dye will need to have been taken up into the horny layer of the pores and skin after which slowly released into the circulation. A cumulative 4-day absorption assuming cm 2 of scalp was given as 0.


The third examine, carried out in , included of active staff. In topics males, 13 ladies with a mean age of 37 years, each laboratory and different exams, together with medical examination, have been done; no irregular thyroid glands or adjustments in T four values have been present in any of the themes when compared with regular values Bauer, The above information are restricted because of small examine sizes, lack of comparison groups, lacking present and historic management data, and missing info concerning potential exposure classes. In a study in a plant producing resorcinol by sulfonation of benzene — and also producing beta -resorcylic acid, resorcinol—formaldehyde resins, sulfites, and sulfates — staff had been uncovered primarily to resorcinol, however the exposure to different agents was not measured for publicity levels, see section 6. In this plant, three cross-sectional studies were carried out between and Flickinger, In , medical examinations, chest X-rays, pulmonary function, haematology, and scientific chemistry were carried out with of persons actively employed at a manufacturing plant in Pennsylvania, USA. In addition, male rats have higher circulating levels of TSH than females.
Although thyroid results are a big finish-point in each human case-studies and animal studies, there is a lack of consistency in the leads to the animal research. Resorcinol triggered no opposed results in several reproduction and developmental toxicity research in rats and rabbits. Resorcinol just isn't thought-about to be genotoxic.
Animals had been maintained for several months with periodic sacrifices Flickinger, The animals were then examined weekly for 10 extra weeks. Sacrificed animals confirmed brown-dyed abdomen walls and filling of abdomen and small gut with a darkish-brown to orange substance. These findings weren't noted in survivors.