Analyzing Teas and Herbal Infusions

January 5/Ghent, Belgium/Life Science Weekly -- New research, "Multimycotoxin UPLC-MS/MS for Tea, Herbal Infusions and The Derived Drinkable Products," is the subject of a report. According to a study from Ghent, Belgium, "In recent years, the consumption of tea and herbal infusions has increased. These hot drinks are consumed as daily drinks as well as for medicinal purposes."

"All tea varieties (white, yellow, green, oolong, black and puerh) originate from the leaves of the tea plant, Camellia sinensis. All extracts made of plant or herbal materials which do not contain Camellia sinensis are referred as herbal infusions or tisanes. During processing and manufacturing, fungal contamination of the plant materials is possible, enabling contamination of these products with mycotoxins. In this study, a multimycotoxin UPLC-MS/MS method was developed and validated for the analysis of the raw tea and herbal infusion materials as well as for their drinkable products. The samples were analyzed by ultra-high-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), with a mobile phase consisting of variable mixtures of water and methanol with 0.3% formic acid. The limits of detection for the different mycotoxins varied between 2.1g/kg and 121g/kg for raw materials and between 0.4g/L and 46g/L for drinkable products. Afterward, 91 different tea and herbal infusion samples were analyzed. Only in one sample, Ceylon melange, 76g/kg fumonisin B(1) was detected," wrote S. Monbaliu and colleagues, Ghent University.

The researchers concluded, "No mycotoxins were detected in the drinkable products."

Monbaliu and colleagues published the results of their research in the Journal of Agricultural and Food Chemistry ("Multimycotoxin UPLC-MS/MS for Tea, Herbal Infusions and The Derived Drinkable Products," Journal of Agricultural and Food Chemistry, 2010;58(24):12664-71).

For additional information, contact S. Monbaliu, Laboratory of Food Analysis, Ghent University, Ghent, Belgium.

From the January 7, 2011, Prepared Foods' Daily News
For more of the latest news from the food and beverage industry, visit Prepared Foods' Daily News