With more than 5000-year civilization, China has gradually formed in its different regions hundreds of the geographic indication products, such as Longjing Tea, Maotai Liquor, Shaoxing Rice Wine, Jinghua Ham, Beijing ...With more than 5000-year civilization, China has gradually formed in its different regions hundreds of the geographic indication products, such as Longjing Tea, Maotai Liquor, Shaoxing Rice Wine, Jinghua Ham, Beijing Roast Duck, Xinjiang Honey Jelon, etc. They are the precious creatures of Chinese nation.展开更多
The colorimetric enantiodiscrimination between mandelic acid and L-proline-Cu（II） is exploited to develop enantioselective indicator displacement assays. The sensitivity of the assay could be tuned by using a colori...The colorimetric enantiodiscrimination between mandelic acid and L-proline-Cu（II） is exploited to develop enantioselective indicator displacement assays. The sensitivity of the assay could be tuned by using a colorimetric indicator. The chromophoric ligand, pyrocatechol violet, effectively competes with the mandelic acid guest for open coordination sites on L-proline-Cu（II）. The △A could be increased to 0.12 by changing the ratio of（＋）- and（-）-mandelic acid concentrations that were found to be optimal from the displacement experiments. The resultant enantiomer excess versus △A relationship is linear. From the calibration curves, the absorbance values of the unknowns may be calculated for the enantiomeric excess value and the colorimetric enantiodiscrimination of mandelic acid can thus be obtained.展开更多
文摘With more than 5000-year civilization, China has gradually formed in its different regions hundreds of the geographic indication products, such as Longjing Tea, Maotai Liquor, Shaoxing Rice Wine, Jinghua Ham, Beijing Roast Duck, Xinjiang Honey Jelon, etc. They are the precious creatures of Chinese nation.
基金supported by the National Natural Science Foundation of China(No.21165022)
文摘The colorimetric enantiodiscrimination between mandelic acid and L-proline-Cu（II） is exploited to develop enantioselective indicator displacement assays. The sensitivity of the assay could be tuned by using a colorimetric indicator. The chromophoric ligand, pyrocatechol violet, effectively competes with the mandelic acid guest for open coordination sites on L-proline-Cu（II）. The △A could be increased to 0.12 by changing the ratio of（＋）- and（-）-mandelic acid concentrations that were found to be optimal from the displacement experiments. The resultant enantiomer excess versus △A relationship is linear. From the calibration curves, the absorbance values of the unknowns may be calculated for the enantiomeric excess value and the colorimetric enantiodiscrimination of mandelic acid can thus be obtained.
