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Epidermoid tumors represent the third commonest lesion of the cerebellopontine angle (CPA). Their evolutive and clinical features are distinctively characteristic. This series is a comprehensive review of the clinical, imaging and surgical aspects of the epidermoid cysts of the CPA. Material and methods: a case series and a analysis of other series of patients diagnosed with an epidermoid cyst of the CPA. The lesions were classified according to their anatomical extent; grade I within the boundaries of the CPA, grade II with extension to the suprasellar and perimesencephalic cisterns and grade III with parasellar and temporomesial region involvement. Results: this study involved forty-three patients with a mean age of 34 years old, 67% of them being female. The opening symptom was headache in 58.1% of the cases and trigeminal neuralgia in 41.8%. According to our classification; the temporomesial involvement (25.6%) was significantly (p = 0.001) associated with a higher incidence of seizures and trigeminal neuralgia was present in patients with lesions limited to the CPA (p = 0.006). The lesions were reached essentially through a retrosigmoidal approach (39.5%) and the surgical excision was deemed to be complete in 65% of the cases. Conclusion: these lesions are usually infiltrative at the time of diagnosis and a trigeminal neuralgia as the opening symptom is associated to more limited lesions and a better outcome. Our classification in grades according to the anatomical extension correlates well with clinical presentation, the type of surgical approach and the extent of surgical removal. [ABSTRACT FROM AUTHOR]

Ozonation of theobroma fat at different applied ozone dosages was carried out and peroxide indexes along with antimicrobial activity were determined. The reaction products were identified using Proton Nuclear Magnetic Resonance Spectroscopy (¹H NMR). The principal signal intensity values were used for following the reaction course between ozone and theobroma fat. The reaction was followed up to peroxide index values of 544 mmol-equiv/kg. The intensities of olefinic proton signals decreased with the gradual increase in ozone concentration until disappearing completely. The Criegee ozonides obtained at 87.4 mg/g of ozone doses were approximately 3.7 times higher than at the beginning of the reaction. The highest action spectrum of antimicrobial activity was obtained with the higher peroxide index. These results suggest that the ¹H NMR spectroscopic technique provides valuable information about of the ozonization grade of theobroma fat which produces an affective antimicrobial activity against Candida albicans. [ABSTRACT FROM AUTHOR]

Ferrous oxidation in xylenol orange (OFX) method for total hydroperoxides (HPT) determination in ozonized sunflower oil was developed and validated. This method can be used in investigations and quality control and preformulation studies. Sunflower oil samples ozonated at different ozone dosage was analyzed and total hydroperoxides (HPT) concentration using OFX method was determined. Peroxides value (IP) established in BP, 2000 was used as standard method. Suitable linearity of the results of the technique was demonstrated in the IP interval concentration of 48,4 to 501,7 mmol/kg (96,9-1 003,4 mmol-equiv/kg), with homogeneous variances, correlation and determination coefficient greater than 99 and 98 % respectively, response factors variation coefficient lower than 5 % (CVf = 4,8 %) and no significantly different of .0. intercept. Recoveries obtained between theoric and experimental concentration (99,2-103,4 %) in accuracy study, no showed a significant difference of 100 %. The method is precise because it satisfy repeatability assay, with variation coefficient not greater than 4,2 %, besides no significant differences were found in either the means or the variances obtained in different days, by different analysts. Exipient used no interferes significantly in the results, which explain the method specificity. No significant differences were found in either the means or the variances of determination realized to ozonized vegetable oil and ozonized vegetable oil with vegetable oil (placebo). The method satisfy all parameters for considerate it validated for HPT determination in ozonized vegetable oil. [ABSTRACT FROM AUTHOR]