Validity and reliability of test strips for the measurement of salivary nitrite concentration with and without the use of mouthwash in healthy adults

This study suggests that commercially available salivary NO2− test strips provide a reasonable surrogate marker for monitoring changes in salivary NO2− concentrations in humans. However, the strips do not provide accurate estimates of absolute NO2− concentrations.
Source: Nitric Oxide - Category: Chemistry Source Type: research