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Rutin in buckwheat grain meal determined by UV photoacoustic spectroscopy and HPLC

Dóka, Ottó, Brunori, Andrea, Schmidt, Rezső, Bicanic, Dane, Végvári, György
Nova biotechnologica et chimica 2017 v.16 no.1 pp. 61-67
Fagopyrum esculentum, Fagopyrum tataricum, buckwheat, high performance liquid chromatography, photoacoustic spectroscopy, rutin
A relatively novel approach for easy and quick determination of rutin in buckwheat grain is suggested. The rutin content of the grain in seven common buckwheat (Fagopyrum esculentum) and six Tartary buckwheat (Fagopyrum tataricum) varieties was investigated by means of UV photoacoustic spectroscopy and HPLC as reference method. The lowest content was found in ‘Botan’ and ‘Bamby’ varieties, while the highest values were obtained in the variety ‘Emka’. Rutin content in grain of all Tartary buckwheat varieties was two orders of magnitude higher than in the other varieties. Rutin content in F. esculentum ranges between 9 and 36 mg/100 g dry weight as compared to 921 to 2 132 mg/100 g dry weight in F. tataricum. The UV photoacoustic spectroscopy data show rather good correlations of R²=0.977 and R²=0.980 with values obtained by HPLC data for all measured samples. Therefore, UV photoacoustic spectroscopy can be a cheap and quick method for determining rutin content in buckwheat grain.