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At least 559 records · Page 31Linked to original sources
PubMed2002

In vivo measurement of human skin absorption of topically applied substances by a photoacoustic technique.

A photoacoustic technique is used for studying topically applied substance absorption in human skin. The proposed method utilizes a double-chamber PA cell. The absorption determination was obtained through the measurement of the thermal effusivity of the binary system substance-skin. The theoretical model assumes that the effective thermal effusivity of the binary system corresponds to that of a two-phase system. Experimental applications of the method employed different substances of topical application in different parts of the body of a volunteer. The method is demonstrated to be an easily used non-invasive technique for dermatology research. The relative concentrations as a function of time of substances such as ketoconazol and sunscreen were determined by fitting a sigmoidal function to the data, while an exponential function corresponds to the best fit for the set of data for nitrofurazona, vaseline and vaporub. The time constants associated with the rates of absorption, were found to vary in the range between 10 and 58 min, depending on the substance and the part of the body.

Acoustics↗
PubMedDate not supplied

The efficacy of nystatin combined with topical microbial agents in the treatment of burn wound sepsis.

Pilot in vitro studies demonstrated that nystatin combined with Silvadene (silver sulfadiazine 1% [Marion Laboratories, Inc., Kansas City Mo.]) or Furacin in a 1:1 ratio was equally effective against Candida albicans and ATCC strains of Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli, but Sulfamylon (Winthrop Pharmaceuticals, Winthrop, N.Y.) combined with nystatin demonstrated an antagonistic response. Therefore we examined the susceptibility to nystatin of 165 clinical isolates, both gram-positive and gram-negative, to nystatin combined with Silvadene or Sulfamylon and 144 isolates to nystatin and Furacin. Both Silvadene and Furacin combined with nystatin were equally effective against the microorganisms as were the individual drugs. Conversely, Sulfamylon combined with nystatin lost its antimicrobial capability (93.3% resistance, p less than 0.001). On the basis of the in vitro results, 93 patients with acute burns were treated with the appropriate topical antimicrobials from April 1988 to September 1988. Of the 93 patients treated, 90 had neither a major systemic bacterial nor a Candida sepsis, and none of these patients had associated localized burn wound sepsis during their hospital stays. These 90 patients were discharged without any documented signs of infection. The average burnsize was greater than or equal to 29.44% total body surface area. These data suggest that the antimicrobial properties of nystatin, when combined with Silvadene and Furacin, remain effective. Consequently, such combinations have been effective in controlling both local and systemic Candida and bacterial burn wound sepsis.

Anti-Infective Agents, Local↗
PubMed2001

Cytotoxic effects of 10% citric acid and EDTA-T used as root canal irrigants: an in vitro analysis.

EDTA-T and 10% citric acid used as root canal irrigants lead to more visible dentinal tubules than 5% sodium hypochlorite associated with 3% hydrogen peroxide. However, these cleansing agents must be compatible with apical periodontal tissue. We analyzed the cytotoxicity of 10% citric acid and EDTA-T in cultured fibroblasts using Trypan blue. The solutions were diluted to 1%, 0.1%, and 0.01% and applied to NIH 3T3 cell cultures. Cells grown on fresh DMEM served as a control. After 0, 6, 12, and 24 h (short-term assay, viability) and 1, 3, 5, and 7 days (long-term assay, survival), the cells were counted using a hemocytometer. In short-term tests, cell viability ranged from 85% to 99% for all experimental groups with no statistical differences when compared with control cultures, except for the group treated with 1% EDTA-T, which caused a progressive decrease in cell viability. In long-term tests, all cultures increased in number from day 1 to the end of the experimental period, showing no inhibition of cell proliferation, except for the cultures treated with 1% EDTA-T, which totally prevented cell growth. All dilutions of 10% citric acid were more biocompatible than EDTA-T. Cultures treated with citric acid had a higher percentage of viable cells in the short-term assays, and the cells retained their self-renewal capacity.

3T3 Cells↗
PubMed1991

In vitro toxicity testing for antibacterials against human keratinocytes.

The use of cultured human keratinocytes in an in vitro comparison of topical antibacterial toxicity for epithelial cells was examined. The complement of three assessments allows testing of epithelial migration, growth, and survival. The three assessments included (1) flow cytometry for determination of cell survival, (2) a comparison of confluent cell culture growth after antibacterial exposures, and (3) an evaluation of cell migration using a technique of dermal explants to study radial migration. A comparative ranking of the toxicities of the various topical antibacterials was determined with the three assessments. This has confirmed anecdotal reports that many of the topical antibacterials are cell-toxic and may inhibit wound healing. This information can be directly extrapolated to the clinical setting, unlike many of the animal data for wound healing that currently exist.

Anti-Bacterial Agents↗