The Quality of Gangjung Added with Detoxified Stem Bark of Rhus verniciflua Extract during Room Temperature Storage

The quality of Gangjung added with detoxified stem bark of Rhus verniciflua (RVSB) extract ($0{\sim}7%$, w/w) during room temperature storage ($25^{\circ}C$, 60 days) was investigated. The moisture content of Gangjung slightly decreased as the storage period increased, especially Gangjung at concentrations between $0{\sim}1%$, $3{\sim}5%$, and 7% decreased after 30, 40 and 50 days of storage, respectively. No significant differences in the hardness were found among the control and experimental samples. However, the peak number of Gangjung containing detoxified RVSB extract at concentrations of $0{\sim}3%$ significantly decreased after 60 days of storage, while that of Gangjung with 5% and 7% addition were not changed during storage. The acid, peroxide and TBA values of Gangjung increased as the storage period increased but the acid value was significantly lower for the Gangjung prepared with 7% (w/w) detoxified RVSB extract after 40 days of storage. Moreover, from 40 to 60 days of room temperature storage, peroxide value significantly decreased as the concentrations of detoxified RVSB extract increased and TBA value significantly decreased when the addition of detoxified RVSB extract was over 3% (w/w). These results suggest that the physical texture of Gangjung improved and lipid oxidation was reduced by the addition of detoxified RVSB extract.

강정의 상온저장 중 무독화 옻 추출물 첨가에 따른 품질 변화

강정의 저장성 향상을 위해 무독화 옻 추출물을 첨가하여 상온에서 60일간 저장하면서 강정의 품질변화를 조사하였다. 무독화 옻 추출물 첨가 강정의 수분함량의 변화는 저장기간이 길어짐에 따라 약간씩 감소하였으며 특히, 대조군과 무독화 옻 추출물 1% 첨가군은 저장 30일에 감소하기 시작하였고 무독화 옻 추출물 3{\sim}5%$ 첨가군은 저장 40일에, 7% 첨가군은 50일에 감소가 시작되었다. 무독화 옻 추출물 첨가강정의 경도는 저장동안 시료간의 유의적 차이가 없었으나 강정의 아삭함을 나타내는 피크수의 변화는 $0{\sim}3%$ 첨가군은 저장 60일부터 감소하기 시작한 반면에 5%와 7% 첨가군은 저장동안 변화가 없었다. 무독화 옻 추출물 첨가 강정의 산가, 과산화물가 및 TBA가는 저장기간이 경과할수록 그 값이 증가하였으나 저장 40일부터 무독화 옻 추출물 7% 첨가 강정의 산가가 유의적으로 낮았다. 또한 과산화물가는 저장 40일부터 무독화 옻 추출물 첨가량이 많을수록 감소하였으며 TBA가도 저장 40일부터 무독화 옻 추출물 3% 이상 첨가 시 추출물 첨가수준이 증가할수록 유의적으로 낮은 값을 나타냈다.