Determination of flavonols in green and black tea leaves and green tea infusions by high-performance liquid chromatography

2001 ◽  
Vol 34 (2-3) ◽  
pp. 223-227 ◽  
Author(s):  
Huafu Wang ◽  
Keith Helliwell
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Green Tea ◽  
High Performance ◽  
Black Tea ◽  
Tea Leaves ◽  
Tea Infusions ◽  
Green And Black Tea

Determination of Fumonisins B1 and B2 in Herbal Tea and Medicinal Plants in Turkey by High-Performance Liquid Chromatography

2004 ◽  
Vol 67 (8) ◽  
pp. 1782-1786 ◽  
Author(s):  
GÜLDEN Z. OMURTAG ◽  
DUYGU YAZICIOĞILU
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Medicinal Plants ◽  
High Performance ◽  
Fumonisin B1 ◽  
Black Tea ◽  
Herbal Tea ◽  
Two Samples ◽  
Fumonisin B2

The purpose of this study was to measure the potential levels of fumonisin B1 (FB1) and fumonisin B2 (FB2) contamination in several herbal teas and medicinal plants that are consumed regularly in Turkey. FB1 and FB2 were detected using high-performance liquid chromatography with fluorescence detection after derivatization with o-phthaldialdehyde. A total of 115 commercially available herbal tea and medicinal plant samples were analyzed. The recoveries in black tea were 86.9 ± 8.42% for FB1 and 102 ± 6.80% for FB2 spiked with 1 μg/g of each analyte. Similarly, the mean recovery results in lime (linden) for FB1 and FB2 were 85.2 ± 9.76% and 78.6 ± 5.67%, respectively. The minimum detectable amounts for the o-phthaldialdehyde derivatives of FB1 and FB2 were 0.025 μg/g (1 ng injected) and 0.125 μg/g (5 ng), respectively. FB1 was detected in two samples (0.160 and 1.487 μg/g), and FB2 was detected in none of the samples.

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