“…There is no doubt about quercetin, isoquercitrin, and quercitrin which are truly native plant components involved in the rutin metabolic pathway, but the origin of DTB, OTA, CDA, DDA, DPD, DBT, DBD, and DBOT is less certain. As shown in Dawidowicz et al (2016), they are formed during the heating of methanolic and methanol/water rutin solution, and they are also known as rutin and/or quercetin degradation products forming during their high-temperature treatment, UV irradiation, or exposure to other aggressive factors (Dubber et al 2005;Rohn et al 2007;Wang et al 2011;Zenkevich et al 2007;Zvezdanović et al 2012). The presented data show that some of them are formed during the heating of ethanolic and ethanol/water rutin solution.…”