Ultrafiltrate of saliva collected in situ for the measurement of testosterone

Evaluation of the Salivette as sampling device for monitoring beta-adrenoceptor blocking drugs in saliva

The Salivette was evaluated with a range of racemic beta-adrenoceptor blocking drugs with different lipophilicity. Recovery from the Salivette appeared to be independent of the stereochemical configuration of the drugs but a significant loss of drug due to the Salivette was observed for all tested drugs. The performance of the method, in terms of accuracy and precision, fitted well within the generally accepted criteria for validation, except near the limit of quantification. The Salivette is successfully used for quantitating salivary beta-blocking drugs.

Cotinine in an ultrafiltrate of saliva

BACKGROUND

We have developed a device for the simplified collection of a prepurified sample of saliva in the mouth.

METHOD

The device is based on the principle of an osmotic pump and accumulated about 1.2 ml of an ultrafiltrate of saliva within 8 min. We have investigated the ultrafiltrate for its utility as a biological medium in the evaluation of cigarette smoking status.

RESULTS

(a) In 58 matched samples from 13 subjects, the correlation coefficient for the cotinine concentration in the saliva and the ultrafiltrate was 0.95; (b) in matched plasma and ultrafiltrate samples from 27 smokers, the correlation coefficient for the cotinine concentrations was 0.96 with plasma containing 1.2 times the ultrafiltrate mean; (c) in a nonsmoker, elevated cotinine levels could be detected in the ultrafiltrate more than 24 hr after smoking 2 cigarettes, and the pattern of rise and decrease reflected that in whole saliva; and (d) in a habitual smoker; the mean cotinine concentration in the ultrafiltrate was 157 ng/ml (SD +/- 25.7 ng/ml) during a period of smoking 15 cigarettes per day and dropped to a mean of 47 ng/ml (SD +/- 10.5) when smoking was reduced to 5 cigarettes per day; after cessation of smoking, detectable concentrations of cotinine persisted for up to 5 days.

CONCLUSION

The device facilitated the aesthetic, noninvasive collection of a biological sample useful in the validation of smoking status.