SummaryDihydroquercetin, a white crystalline pentahydroxy‐flavanone, occurring in large quantities in Douglas fir and Jeffrey pine barks, was found to be an effective antioxidant for lard, cottonseed oil, and butter oil. This compound imparts no taste and color to fats and oils and, like quercetin, appears to be nontoxic. It was found that 0.03% quercetin was slightly more effective than 0.03% dihydroquercetin as an inhibitor of rancidity in lard. The presence of a small amount of citric acid increased markedly the antioxidant effect of dihydroquercetin on lard. The pentaacetate, pentapropionate, and the pentabenzoate esters of dihydroquercetin showed no antioxidant activity.
The hexagonal modification of ZnSe single crystals has been observed. The crystals were grown by the sublimation method. The lattice parameters are found to be a0 = 4.003±0.001 Å and c0 = 6.540±0.003 Å. The photoconductivity peaks observed in the spectral response curves at room temperature reflect the band symmetries of the wurtzite structure and obey the group theoretical selection rules. From the position of the photoconductivity maxima for E ⊥ C, the band gap energy at room temperature is estimated to be 2.795 eV.
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