Coffee flavor improver and method for producing the same

A coffee flavor improver of a solution that contains aroma compounds emitted in grinding roasted coffee beans,

• the solution being a propylene glycol solution satisfying the following requirement A1, or an ethanol solution satisfying the requirement B 1, or a combination thereof:
• requirement A1:
• in a total ion chromatogram obtained through electron-impact ionization (EI mode) at 70 eV using a gas chromatography mass spectrometer (GC/MS) equipped with a quadrupole mass analyzer and using polar columns, the chromatogram has peaks for 2-methylfuran, 2-methylbutyl aldehyde, isovaleraldehyde, 2,5-dimethylfuran, 3-hexanone, 2-vinylfuran, pyridine, 2,5-dimethylpyrazine, 2-ethyl-6-methylpyrazine and 3-ethylpyridine, the ratio of the total area of all the peaks having a retention index not more than that for acetoin to the total area (excepting for propylene glycol) of all the peaks in the chromatogram is 90% or more and less than 95%, and the ratio of the total area of all the peaks having a retention index larger than that for acetoin to the total area (excepting for propylene glycol) of all the peaks in the chromatogram is more than 5% and 10% or less;
• requirement B1:
• in a total ion chromatogram obtained through electron-impact ionization (EI mode) at 70 eV using a gas chromatography mass spectrometer (GC/MS) equipped with a quadrupole mass analyzer and using polar columns, the chromatogram has peaks for 2-methylfuran, 2-methylbutyl aldehyde, isovaleraldehyde, 2,5-dimethylfuran, 3-hexanone, 2-vinylfuran, pyridine, 2,5-dimethylpyrazine, 2-ethyl-6-methylpyrazine and 3-ethylpyridine, the ratio of the total area of all the peaks having a retention index not more than that for acetoin to the total area (excepting for ethanol) of all the peaks in the chromatogram is 93% or more and less than 98%, and the ratio of the total area of all the peaks having a retention index larger than that for acetoin to the total area (excepting for ethanol) of all the peaks in the chromatogram is more than 2% and 7% or less.