본 연구에서는 우리나라의 연근해에서 생산되는 해조류를 이용하여 압출 성형물을 제조하기 위하여 단축스쿠류 압출성형기를 이용, corn grits에 미역 분말을 첨가하여 압출성형시켰을 때 일어나는 이화학적 특성변화를 반응표면 실험계획법에 의하여 분석하였다. 미역분말을 첨가한 corn grits압출성형물의 이화학적 측정치인 각 종속변수들간의 단순상관관계를 보면 밀도는 팽화율, 명암도, 파단강도는 수분용해 지수, 명암도, 수분흡수지수는 수분용해도지수에서 유의차를 나타내었다. 독립변수인 수분함량($15{sim}21\%$), 미역분말함량($10{sim}30\%$) 및 토출구온도($95{sim}115^{circ}C$)의 주어진 범위에서 각 종속변수인 이화학적 특성에 대한 영향을 3차원 반응표면 회귀분석을 하였을 때, 팽화율은 수분함량이 감소하고 토출구 온도가 증가할 때 증가하였으며, 밀도는 수분함량과 미역분말함량이 증가함에 따라 증가하는 것으로 나타났다. 파단강도는 수분함량과 미역분말함량이 증가함에 따라 증가하는 것으로 나타났다. 파단강도는 수분함량이 증가함에 따라 증가하는 반면, 미역분말함량에 따라서는 감소하는 경향이었다. 수분용해도지수는 수분함량이 증가할수록 증가하는 경향으로 나타났고, 명암도는 대체로 미역함량이 증가함에 따라 감소하는 경향을 보여주었다.
The present study was focused on investigation of proper processing conditions to develop physicochemical properties of extrudates using sea mustard and corn by single extruder. Response surface analysis was used to evaluate effects of extrusion variables on the quality of the extrudates. Physicochemical dependence variables of sea mustard extrudates with corn grits show a significance correlation of within $5\%$. Among the various dependence variables, the expansion ratio showed a high correlation with bulk density, break strength, water solubility index and yellowness. Bulk density correlated closely with water solubility index; break strength with water absorption index and lightness, and water absorption index with lightness. Water solubility index and lightness showed a significance correlation with yellowness of within $0.5\%$. Three dimensional graphic analysis on response surface regression was conducted with each of the dependent variables which revealed statistically significant relationship to independent variables: $15{sim}21\%$ moisture content, $10{sim}30\%$ sea mustard content and $95{sim}115^{circ}C$ die temperature. Expansion ratio decreased with increasing moisture and sea mustard content. It showed the highest value at $18\%$ moisture content, $10\%$ sea mustard content and $95^{circ}C$ die temperature. and the lowest value was at $21\%$ moisture content, $30\%$ sea mustard content and $105^{circ}C$ die temperature. Bulk density was highest at $21\%$ moisture content, $30\%$ sea mustard content and $105^{circ}C$ die temperature. On the other hand, it was lowest at $18\%$ moisture content, $10\%$ sea mustard content and $95^{circ}C$ die temperature. Break strength was highest at $18\%$ moisture content, $10\%$ sea mustard content and $115^{circ}C$ die temperature, but lowest at $21\%$ moisture content, $30\%$ sea mustard content and $105^{circ}C$ die temperature. Water solubility index increased in the range of $43.9{sim}54.8\%$ as the moisture content increased.
