Screening of Lignan Compounds and Antioxidant Activity of Chungkukjang Fermented with Defatted Sesame Flour

참깨 탈지박을 첨가하여 제조한 청국장의 생리활성 및 리그난 성분 탐색

This study is on the effect of oil seed by-products added to Chungkukjang. For this, we designed three cases: Chungkukjang was added in with defatted sesame flour before fermented (DSFBF), added with defatted sesame flour after fermented (DSFAF) and with no adding (control). In each case, the common ingredients and the active antioxidant ingredients were examined and compared and the effects were analyzed. According to microanalysis result, carbohydrate content Chungkukjang the DSFAF 24.97%, control 23.86%, DSFBF Chungkukjang 20.21% as compared to control and Chungkukjang DSFAF relatively low carbohydrate content. The moisture contents in DSFBF (55.98%) or DSFAF (52.83%) were higher than that in control (48.89%). Chungkukjang crude ashes in DSFBF (1.48%) or DSFAF (2.41%) were much lower than in control (6.45%). The proportions of crude lipid in DSFBF (3.30%) or DSFAF (3.93%) were higher than in control (1.77%) by about 2%. As for crude protein, the percentage in DSFAF (15.86%) was lower than that of DSFBF (19.03%) or of control (19.03%). There was no meaningful difference in biological activity measurement as total phenolic contents were 1.26 mg/mL in DSFBF, 1.14 mg/mL in DSFAF and 1.26 mg/mL in control. But electron donating ability was meaningfully more active in DSFBF (21.30%) than in control (20.24%). The superoxide dismutase (SOD)-like activity in DSFBF (68.48%) was twice higher than in control (34.01%), which may imply that DSFBF contain some ingredients that can scavenge superoxide anion radically. In hydroxyl radical scavenging activity, DSFAF scores 96.87%, which is the highest with 96.40% in DSFBF and 95.73% in control. Relative antioxidative effects in DSFBF was 47.92%, which is comparable to 47.06% in control. As a result of extraction and quantitative HPLC analysis of sesamin and sesamolin extracted from the samples, DSFBF contained 3.04$\pm$0.21 mg/g of sesamin, which is meaningfully higher than 2.41$\pm$0.14 mg/g in DSFAF. Content of sesamolin was higher in DSFBF (1.36$\pm$0.09 mg/g) than DSFAF (1.12$\pm$0.07 mg/g) or in control. We can conclude that biologically active and effective ingredients could be found more in DSFBF than in DSFAF or in control. This study conveys not only the meaning that oil seed by-products can be used as an ingredient for making Chungkukjang functional food, but also the possibility that oil seed by-products themselves could become excellent functional food.

본 연구는 청국장에 유지부산물을 첨가하여 일반성분, 항산화활성에 미치는 영향 및 유효성분을 분석하였다. 일반성분 분석 결과 탄수화물 함량은 DSFAF 청국장 24.97%, Control 23.86%, DSFBF 청국장 20.21%로 Control과 DSFAF 청국장에 비해 탄수화물 함량이 비교적 낮았다. 수분함량은 DSFBF 청국장 55.98%, DSFAF 청국장 52.83%, Control 48.89%로 Control에 비해 DSFBF 청국장이 높게 나타났고, 회분함량은 DSFBF 청국장 1.48%, DSFAF 청국장 2.41%, Control 6.45%로 DSFBF, DSFAF 청국장 모두 Control보다 낮게 나타났다. 조지방 함량은 DSFBF 청국장 3.30%, DSFAF 청국장 3.93%, Control 1.77%로 Control보다 DSFAF 청국장이 2%정도 함량이 많았으며, 조단백질 함량의 경우 DSFBF 청국장 19.03%, DSFAF 청국장 15.86%, Control 19.03%로 Control과 비슷하거나 낮은 경향을 보였다. 생리활성 측정에서 총 페놀 함량은 DSFBF 청국장 1.26 mg/mL, Control 1.20 mg/mL, DSFAF 청국장 1.14 mg/mL로 Control과 유의적인 차이를 나타내었으며, 전자공여능은 DSFBF 청국장 21.30%로 Control 20.24%에 비해 유의적으로 높은 활성을 나타냈다. SOD 유사활성에서는 DSFBF 청국장 68.48%로 Control 34.01%에 비해 2배 이상의 superoxide anion 제거능이 높은 물질을 함유하고 있음을 예상할 수 있다. Hydroxyl radical 소거능에서는 DSFAF 청국장 96.87%, DSFBF 청국장 96.40%, Control 95.73%로 90% 이상의 높은 hydroxyl radical 소거능을 보였다. Relative antioxidative effects 저해활성은 DSFBF 청국장 47.92%, Control 47.06%로 비슷한 결과를 나타내었다. 본 시료 추출물에서의 sesamin, sesamolin을 HPLC를 통해 정량한 결과 sesamin은 DSFAF 청국장 2.41${\pm}$0.14 mg/g, DSFBF 청국장 3.04${\pm}$0.21 mg/g로 DSFBF 청국장이 비교적 높은 함량을 보였다. Sesamolin 또한 DSFAF 청국장 1.12${\pm}$0.07 mg/g, DSFBF 청국장 1.36${\pm}$0.09 mg/g으로 Control과 DSFAF 청국장에 비해 DSFBF 청국장이 생리활성 및 유효성분에서 더 높은 함량을 나타냈다. 기름 제조 후 부산물로 생성되는 참깨탈지박은 청국장에 새로운 기능성을 부여하는 기초 자료는 물론, 앞으로 우수한 기능성식품으로서의 가능성이 시사된다.