Thirty-eight California and French wines were analyzed for y-nonalactone by Freon extraction and gas chromatography. The California white wines had from 0 to 16 pg/L (average for 6 samples was 7 ~lgl L and the red wines from 12 to 43 kg/L (average for 20 samples was 24 t&L). French red wines obtained similar amounts, 14 to 41 p&L (average for 12 samples was 21 p&L). The sensory threshold for ynonalaconte was determined to be 30 kg/L.
The sum of the flexo-coefficients (e 11 +e 33 ) was measured by the capacitance characteristic depending on the applied dc voltage in the HAN cell. The voltage for the minimum value of the capacitance was shifted by the influence of flexoelectric effect. One of the important problems for the evaluation for the flexo effect was the influence of impurity ions. Then, the chromatographic isolation phenomenon was used to separate impurity ions when the LC material was injected into the empty cell by the capillary action. The coefficient (e 11 +e 33 ) of ZLI-4792 was measured, and a value of 26.0 pC/m was obtained.
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