Analyses of antioxidative properties of selected cyclitols and their mixtures with flavanones and glutathione

The conditions for determining the antioxidant properties of cyclitols (D-pinitol, L-quebrachitol, myo-, L-chiro-, and D-chiro-inositol), selected flavanones (hesperetin, naringenin, eriodictyol, and liquiriti-genin) and glutathione by spectrophotometric methods—CUPRAC and with DPPH radical, and by a chromatographic method DPPH-UHPLC-UV, have been identified. Interactions of the tested compounds and their impact on the ox-red properties were investigated. The RSA (%) of the compounds tested was determined. Very low antioxidative properties of cyclitols, compared with flavanones and glutathione alone, were revealed. However, a significant increase in the determined antioxidative properties of glutathione by methyl-ether derivatives of cyclitols (D-pinitol and L-quebrachitol) was demonstrated for the first time. Thus, cyclitols seem to be a good candidate for creating drugs for the treatment of many diseases associated with reactive oxygen species (ROS) generation.