Promotion of cutaneous penetration of nifedipine for nanoemulsion

ABSTRACT This article reports the development and characterization of a nanoemulsion (NE) able to improve the cutaneous penetration of nifedipine. NE with nifedipine was development and characterized, presenting droplet size of 20 nm with low polydispersity index (IP<0.1), spherical shape without aggregation, pH compatible with typical skin levels and stability evaluated by seven months. In the permeation studies, a classical formulation based in an oil/water cream containing nifedipine was used for comparison with NE. Nanoemulsion promoted and improved the retention of nifedipine in the epidermis and dermis in relation to classical formulation. This promoting effect is related to the nanometric size of the droplets of the NE (20 nm), which give him a large superficial area, favoring the contact of the nanocarrier with the skin surface. The NE was efficient in promoting accumulation of nifedipine in the dermis, which is the site of vasodilation action. NE was not irritating according to the primary dermal irritation tests. NE is a promising release system to promote cutaneous penetration of nifedipine and can be used in the future in clinical trials to promote healing of lesions caused by peripheral vascular diseases.

Effects of Chlamydia and Mycoplasma Infections on the Healing of Wounds after Surgery for Haemorrhoids,Fistula and Anoschisis / 华中科技大学学报(医学版)

Objective To explore the effects of chlamydia and mycoplasma infections on the healing of wounds after surgical operation for haemorrhoids,fistula and anoschisis.Methods Sixty-two patients with haemorrhoids,fistula and anoschisis undergoing the surgical operation during 2000.1 to 2008.10 were collected,and wounds did not heal 40 days after operation and the wound's surface infection occurred after postoperative anti-inflammatory therapy and dressing change.All patients were positive at least for laboratory Ct or Uu,and those with infections caused by other fungi,bacteria,viruses and the other systemic diseases were excluded.The correlation between the infections in 62 cases and sex,surgical types was analyzed.Results In 62 patients,there were 30 cases (48.4%) positive for both Ct and Uu,22 cases for single Ct (35.5%),and 10 cases for single Uu (16.1%),respectively.The infection rate in females was higher than in males (P<0.01).The surgical types included:surgery for 8 cases of haemorrhoids (12.9%),for 18 cases of fistula(29.0%),and for 36 cases of anoschisis(58.1%).respectively.Conclusion There is the possibility of chlamydia and mycoplasma infections in the patients with delayed healing of wounds following the surgical treatment on the anal region.Early diagnosis,early treatment,avoidance of ineffective medicines and repeatedly management of the wounds can shorten the healing period.