Document VJVVvpQpgDZpvkLbLGdBKEDEw

TRADESECRET AR226-3082 DuPont H L-1997-01205 Study Title H-22994: SKIN IRRITATION T e s t IN RABBITS L a b o r a t o r y P r o je c t ID : HD-1997-01205 Author: Tracy A. FUliben Study Completed on: December 5,1997 Performing Laboratory: E. I. du Pont de Nemours and Company Haskell Laboratory for Toxicology and Industrial Medicine Elkton Road, P.O. Box 50 Newark, Delaware 19714-0050 Work Request Number: Page 1 o f 10 Company S a n i t i . W as no. conunn TSCA CB. H-22994: Skin Irritation Test in Rabbits Study Director: Issued by: CERTIFICATION f10 . 'V Tracy A . Filliben T oxicology A ssociate DuPont HL-1997-01205 Date -2 - Company Sanitized. Does not contain TSCA CBI H-22994: Skin Irritation Test in Rabbits STUDY INFORMATION DuPont HL-1997-01205 Stability: The test substance appeared to be stable under the conditions of the study; no evidence o f instability was observed. Sponsor: E.I. du Pont de Nemours and Company Wilmington, Delaware 19898 U.S.A. . Study Initiated / Completed: November 18,1997 / (see report cover page) In-Life Initiated / Completed: November 1 9 ,1997/November 22,1997 -3 - Company Sanitized. Does not contain TSCA CBi H-22994: Skin Irritation Test in Rabbits DuPont HL-1997-01205 STUDY PERSONNEL M anagers): Judith C. Stadler, Ph.D. Study Director: Tracy A. Filliben Primary Technician: Tracy A. Filliben Toxicology Report Preparation^): Lisa G. Burchfield, A.A. Laboratory Veterinarian: Charles E. Cover, V.M.D. -4 - Company Sanitized. Does not contain TSCA CBI H-22994: Skin Irritation Test in Rabbits DuPont HL-1997-01205 SUMMARY H-22994 was evaluated for acute skin irritation potential in 6 female New Zealand W hite rabbits. Approximately 0.5 mL of the test substance was applied to the shaved, intact skin o f each rabbit and covered with a semi-occlusive dressing for a 4-hour exposure. Approximately 1,24,48, and 72 hours after removal o f the test substance, the test sites were evaluated for erythema, edema, and other evidence o f dermal effects and were scored according to the Draize Scale. The adjacent areas of untreated skin were used for comparison. H-22994 produced slight or mild erythema by 1 hour after test substance removal. By 24 hours, 2 rabbits were clear o f all dermal irritation, and the remaining rabbits exhibited slight or mild erythema. Two additional rabbits exhibited no dermal irritation by 48 hours after test substance removal. The remaining 2 rabbits exhibited mild erythema at 48 hours and slight erythema by 72 hours. No edema was observed 1,24, or 48 hours after test substance removal; however, slight edema was observed in 1 rabbit at 72 hours. No clinical signs of toxicity were observed during the study. Under the conditions o f this study, H-22994 was a mild skin irritant. -5 - Company Sanitized. Does not contain TSCA CBi H-22994: Skin Irritation Test in Rabbits DuPont HL-1997-01205 INTRODUCTION The purpose of this study was to evaluate the skin irritation potential of H-22994 when applied to the shaved, intact skin of New Zealand White rabbits. M ATERIALS AND METHODS A. Animal Husbandry Young adult female HM:(NZW)fBR New Zealand W hite rabbits were received from Hare Marland. The rabbits were housed singly in suspended, stainless steel, wire-mesh cages. Each rabbit was assigned a unique identification number which was recorded on a card affixed to the cage. The last 3 digits o f the identification number were written on the inside of each rabbit's ear with a water insoluble marker. The rabbits were offered approximately 125 grams of Purina Certified High Fiber Rabbit Chow #5325 daily during the study. W ater was available ad libitum except during the exposure period while the animals were in stocks. Haskell Laboratory has an animal health monitoring program. This program is monitored and administered by the Laboratory Veterinarian. W ater samples are periodically analyzed for total bacterial counts and for the presence of coliforms, lead, and other contaminants. Additionally, samples from freshly washed cages and cage racks are periodically analyzed to ensure adequate sanitation by the cagewashers. Data from this program are maintained separately from study records. Animal feed is certified by the manufacturer to meet specified nutritional requirements and to be free of a list of specified contaminants. On the basis of these analyses, there is no evidence suggesting that contaminants were present in the feed or water in amounts which may have interfered with the results o f this study. Rabbits were quarantined, weighed, and observed for general health for approximately 2 weeks. Animal rooms were maintained on a timer-controlled, 12-hour light/12-hour dark cycle. Environmental conditions o f the rooms were targeted for a temperature of 20C 1C and relative humidity of 50% 10%. Excursions outside these ranges were judged to have been of insufficient magnitude and/or duration to have adversely affected the validity of the study. B. Protocol On the day prior to treatment, the hair of 6 female New Zealand W hite rabbits was closely shaved to expose the skin from the scapular to the lumbar region o f the back. The body weights of the rabbits ranged from 2508 to 2785 grams on the day of treatment. Each rabbit was placed into a stock which had been fitted with a piece of rubber sheeting, approximately 8" x 18". The rabbits remained in the stocks throughout the exposure period and during that time did not have access to food or water. Approximately 0.5 mL of H-22994 was -6 - Company Sanitized. Does not contain TSCA CBI H-22994: Skin Irritation Test in Rabbits DuPont HL-1997-01205 applied directly on the test site beneath a 1-inch, 2-ply gauze square that was held in place with non-irritating tape. Rubber sheeting was then wrapped around the animal and secured with clips to retard evaporation and to keep the test substance in contact with the skin without undue pressure. One other test substance was tested concurrently on a separate, localized test site on the backs of these rabbits. Approximately 4 hours after application of the test substance, the rubber sheeting was loosened, and the skin at the comers o f the gauze squares was marked with a waterproof pen; wrappings and gauze squares were then removed. The test sites were gently washed with warm water to remove excess test substance. The skin was gently patted dry, and the animals were returned to their cages. Approximately 1,24,48, and 72 hours after removal o f the test substance, the test sites were evaluated for erythema, edema, and other evidence of dermal effects and were scored according to the Draize Scale (Table 1). The adjacent areas of the untreated skin were used for comparison. The rabbits were also examined for clinical signs of toxicity at every dermal evaluation. RESULTS AND DISCUSSION H-22994 produced slight erythema in 4 rabbits and mild erythema in 2 rabbits by 1 hour after test substance removal. By 24 hours, 2 rabbits were clear o f all dermal irritation. O f the remaining rabbits, 3 exhibited slight erythema, and 1 exhibited mild erythema. Two additional rabbits exhibited no dermal irritation by 48 hours after test substance removal. The remaining 2 rabbits exhibited mild erythema at 48 hours and slight erythema by 72 hours. No edema was observed 1, 24, or 48 hours after test substance removal; however, slight edema was observed in 1 rabbit at 72 hours. No clinical signs of toxicity were observed. Individual skin irritation scores are presented in Table 2. A summary of skin responses is presented in the following table. SUMMARY OF SKIN RESPONSES TO H-22994 RESPONSE No Response Slight M ild 1 hour 0/6 4/6 2/6 ERYTHEMA 24 hours 48 hours 2/6 4/6 3/6 0/6 1/6 2/6 72 hours 4/6 2/6 0/6 1 hour 6/6 0/6 0/6 ED EMA 24 hours 48 hours 6/6 6/6 0/6 0/6 0/6 0/6 72 hours 5/6 1/6 0/6 CONCLUSIONS Under the conditions o f this study, H-22994 was a mild skin irritant. If these test scores are to be used for EEC/OECD classification, according to the guide to the labeling of dangerous substances published in the Official Journal of European Communities -7 - Company Sanitized. Does not contain TSC CB! H-22994: Skin Imitation Test in Rabbits DuPont HL-1997-01205 (EEC Directive 93/21, Annex VI), H-22994 probably should not be classified as an irritant unless further data proves otherwise. RECORDS RETENTION All study records, raw data, and the final report are retained at Haskell Laboratory, Newark, Delaware, or at Iron Mountain, 200 Todds Lane, Wilmington, Delaware 19802 (formerly known as the E. L du Pont de Nemours and Company Records Management Center). Company Sanitized. Does not contain TSCA CBI H-22994: Skin Irritation Test in Rabbits DuPont HL-1997-01205 TABLE 1 DRAIZE3SCALE FOR SCORING SKIN IRRITATION Evaluation of Skin Reactions Score Erythema and eschar formation: No erythema.................................................................................................................. 0 Very slight erythema (barely perceptible).................................................................... 1 (Slight) Well-defined erythem a............................................................................................ 2 (Mild) Moderate to severe erythema........................................................................................ 3 (Moderate) Severe erythema (beet redness) to slight eschar formation (injuries in depth)..........4 (Severe) Edema formation: No edema.............. 0 Very slight edema (barely perceptible)......................................................................... 1 (Slight) Slight edema (edges o f area well defined by definite raising).....................................2 (Mild) Moderate edema (raised approximately 1.0 m m )........................................................ 3 (Moderate) Severe edema (raised more than 1.0 mm extending beyond the area of exposure)... 4 (Severe) Abbreviations o f other dermal effects are: A = Abraded F = Fissuring I = Intact N = Necrosis T = Thickening G = Fissuring with C = Eschar Bleeding - = No Effect S = Epidermal B = Blanching Scaling D = Desquamation L = Sloughing R = Raw Areas X = Compound Adhered to Skin SN = Superficial Necrosis a Draize, J. H ., "Dermal Toxicity." Appraisal of the Safety o f Chemicals in Foods, Drugs and Cosm etics. The Editorial Committee o f the Association o f Food and Drug O fficials o f the United States, Austin, Texas, 1959, pp. 46-59. - 9 - Company Sanitized. Does not contain TSCA CBS H-22994: Skin Irritation Test in Rabbits DuPont HL-1997-01205 TABLE 2 INDIVIDUAL SKIN IRRITATION SCORES AND SKIN RESPONSES OBSERVED IN RABBITS RABBIT NUMBER 32361 32313 32409 32403 32404 32405 HOURS AFTER TEST SUBSTANCE REMOVAL ERYTHEMA EDEMA 1 24 48 72 1 24 48 72 1000 0 0 00 1000 0 0 00 1 12 10 0 0 1 1 12 1 0 0 0 0 2 200 0 000 2 10 0 0 0 0 0 - 10Company Sanitized- Does not contain TSCA CBI