Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Reina Mercedes 10, Seville E-41012, Spain ...

Universidade Federal do Rio de Janeiro, Instituto de Química, LAGOA─LADETEC, Ilha do Fundão, Rio de Janeiro, Rio de Janeiro 21941-909, Brazil ...

The quality of black tea is often related to pigments called theaflavins and thearubigins. Chemical examination of the thearubigins shows that they are polymeric proanthocyanidins.

RECENT developments in the field of gas chromatography have included the measurement of gas–solid adsorption isotherms from the retention data 1–3. A peak obtained from a single injection is ...