.6. Skin irritation assessment
Animal studies have been carried out after getting ethical clearance from Institutional Animal Ethical Committee, VIT University, Vellore, India. Skin irritancy test was carried out to resolve possible localized reaction (if any) of the optimized microemulsion formulation on the skin of male wistar rats (150–180 g) [27]. The hair on the dorsal side of male wistar rats was removed one day before the commencing of the experiment [28]. The rats were divided into three groups (n = 4). Group I was served as control (no treatment), Group II received 0.8% (v/v) aqueous formalin solution as a standard irritant [29], Group III received cinnamon oil (6%) only, and Group IV received the microemulsion formulation (CMF4). A dose of 0.5 mL of formalin solution or cinnamon oil or microemulsion formulation was applied onto a 5 cm2 area of the shaved dorsal side of the wistar rats daily for 3 consecutive days [30]. The development of erythema and edema (if any) were monitored daily. Finally, the application site was graded according to visual scoring scale (always by the same investigator
.6. Skin irritation assessment
Animal studies have been carried out after getting ethical clearance from Institutional Animal Ethical Committee, VIT University, Vellore, India. Skin irritancy test was carried out to resolve possible localized reaction (if any) of the optimized microemulsion formulation on the skin of male wistar rats (150–180 g) [27]. The hair on the dorsal side of male wistar rats was removed one day before the commencing of the experiment [28]. The rats were divided into three groups (n = 4). Group I was served as control (no treatment), Group II received 0.8% (v/v) aqueous formalin solution as a standard irritant [29], Group III received cinnamon oil (6%) only, and Group IV received the microemulsion formulation (CMF4). A dose of 0.5 mL of formalin solution or cinnamon oil or microemulsion formulation was applied onto a 5 cm2 area of the shaved dorsal side of the wistar rats daily for 3 consecutive days [30]. The development of erythema and edema (if any) were monitored daily. Finally, the application site was graded according to visual scoring scale (always by the same investigator
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