본 실험은 전통발효식품인 청국장의 기능성 및 품질향상을 위한 기초자료를 제공하기 위하여 생약초(표고버섯, 더덕 및 어성초)를 첨가하여 청국장을 제조하고 이들의 이화학적 특성을 조사하였다. 생약초 분말 첨가량이 증가함에 따라 색도 중 a값과 b값은 증가하였으며, L값과 pH의 경우 감소하는 경향을 보였다. 일반성분 중 조단백질과 조지방 함량은 생약초 첨가수준이 높을수록 다소 감소하였으며, 수분, 회분은 첨가량에 영향을 받지 않는 것으로 나타났다.

Cheongkukjang was prepared by addition of medicinal herb powder (from Lentinus edodes, Codonopsis lanceolata BENTH et HOOK, or Houttuynia cordata THUNB) to improve Cheongkukjang quality and functional properties. Redness and yellowness (measured using Hunter’s color values) increased with increasing amounts of medicinal herb powder, whereas lightness (the third Hunter's color value) and pH decreased. Crude protein and lipid levels of Cheongkukjang decreased with increasing amounts of added medicinal herb powder, whereas powder addition did not affect either the moisture or crude ash content of Cheongkukjang. The major organic acids of Cheongkukjang were lactic acid, acetic acid, succinic acid, and citric acid, and acid levels increased as the proportion of medicinal herb powder in the Cheongkukjang preparation increased. The major amino acids of Cheongkukjang were glutamic acid, aspartic acid, leucine, arginine, and lysine and the principal fatty acids were linoleic acid, oleic acid, palmitic acid, and linolenic acid. Addition of medicinal herb powder to Cheongkukjang increased both crude saponin and quercetin contents. Sensory scores of Cheongkukjang containing 2% (w/v) medicinal herb powder were optimal in terms of both quality characteristics and sensory evaluation.

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