Abstract: Disclosed is a method for determining the age of ginseng roots using chromatography-mass spectroscopy. It comprises: extracting a metabolome from a ginseng sample; subjecting the metabolome to liquid chromatography-mass spectroscopy (LC/MS) or gas chromatography-mass spectroscopy (GC/MS) to afford an analysis result; converting the LC/MS or GC/MS analysis result to statistically accessible data; and performing a statistical analysis of the data to determine the age of ginseng sample. Based on the metabolite fingerprinting of metabolomics, the method can determine the exact age of ginseng roots from a very small amount of roots within a short time in a non-destructive manner with minimal damage to the roots.

Abstract: A refrigerator using a non-azeotropic refrigerant mixture (NARM) and a control method thereof. The refrigerator reduces the rotational speed of a freezing chamber fan or stopping the freezing chamber fan for a designated time, and/or increasing the rotational speed of a compressor in a simultaneous freezing/refrigerating operation mode of an NARM cycle as compared to a freezing operation mode, and may thus decrease evaporation latent heat of a refrigerant consumed by a freezing chamber evaporator and relatively increase evaporation latent heat of the refrigerant usable in a refrigerating chamber evaporator without increase in a charging amount of the refrigerant, thereby preventing over-charging due to increase in the charging amount of the refrigerant and reducing cycling loss.