Analysis of vitamin K in green tea leafs and infusions by SPME–GC-FID |
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| Authors: | Má rcia Reto,Maria E. Figueira,Helder M. Filipe,Cristina M.M. Almeida |
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| Affiliation: | 1. Faculdade de Farmácia da Universidade de Lisboa, Unidade Farmacologia e Farmacotoxicologia, Av. das Forças Armadas, 1600-083 Lisboa, Portugal;2. Faculdade de Farmácia da Universidade de Lisboa, Laboratório de Bromatologia, Av. das Forças Armadas, 1600-083 Lisboa, Portugal;3. Faculdade de Farmácia da Universidade de Lisboa, Laboratório de Hidrologia, Av. das Forças Armadas, 1600-083 Lisboa, Portugal |
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| Abstract: | The usual methods for determination vitamin K are laborious. With the aim of replace them by a simpler method that requires fewer solvents, lower analytical levels and allows reporting of results in a smaller period of time, a procedure based on solid-phase microextraction (SPME) and gas chromatography with flame ionization detector (GC-FID) was developed. This method was used to analyse vitamin K in green tea leafs and infusions from nine brands of green tea commercialised in Portugal. |
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| Keywords: | Green tea SPME Infusion Vitamin K1 Vitamin K2 |
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