Method for producing black ginseng concentrate with increased prosapogenin ginsenoside content using continuous steaming-drying technique and combined concentration technology

A method for producing black ginseng concentrate, the method comprising:

• (1) steaming ginseng followed by drying to prepare red ginseng;
• (2) carrying out extraction by adding water to a black ginseng mixture containing black ginseng, Patrinia scabiosaefolia roots, Persicaria hydropiper leaves, and Persicaria thunbergii leaves followed by filtration to prepare a mixed plant extract;
• (3) having the red ginseng, which is prepared in the step (1), immersed for 2 to 4 hours in the mixed plant extract prepared in the step (2) followed by recovery-recovering the red ginseng from the extract;
• (4) placing the red ginseng recovered in the step (3) in a steaming dryer followed by steaming, cooling, and drying to prepare black ginseng;
• (5) carrying out extraction of crushed black ginseng, which is obtained by crushing the black ginseng prepared in the step (4), by adding alcohol followed by filtration to prepare a black ginseng extract;
• and
• (6) concentrating the black ginseng extract prepared in the step (5) by using an evaporative concentrator followed by heat treatment.