摘要
以魔芋胶 (KG)为基材 ,研究KG的浓度、增塑剂的种类与浓度和干燥温度等因素对膜的抗张强度 (TS)、耐破度 (BS)、伸长率 (E)以及水蒸气透过系数 (WVP)的影响。结果表明 ,随KG浓度的增大 ,各指标均有所升高 ,但浓度太高 (>10 g/L) ,制膜困难 ,且表观性状不够理想。综合考虑 ,浓度以 8g/L为宜 ;随增塑剂浓度的增加 ,膜的TS下降 ,E增大 ,阻湿性能明显降低 ;3种增塑剂中 ,甘油的增塑效果最明显 ,聚乙二醇 4 0 0次之 ,乙二醇最差 ;随干燥温度的提高 ,膜的TS有所增加 ,E和WVP有所降低 ,但温度太高 ,膜显微黄色 ,脆性增大 ,一般
The effects of concentration of KG, plasticizers and drying temperature on tensile strength (TS), bursting strength (BS), elongation rate (E) and water vapour permeability (WVP) of KG film were studied The results showed that above indexes increased with the increase of KG concentration But if the KG concentration too high (>10?g/L), it was difficult to form film or the apparent character of formed film was not good enough Comprehensively considered, the optimum KG concentration was 8?g/L With the increase of plasticizer concentration, TS of the film lowered, E rose and moisture barrier ability apparently weakened Among applied plasticizers, plasticizing effect of glycerol was the most apparent, polyethylene glycol 400 (PEG 400) the second and glycol the least With the rising of the drying temperature, TS of the film strengthened, E and WVP decreased But if the drying temperature too high, the film would show a little yellow and its brittleness rose The suitable drying temperature was 60℃
出处
《食品与发酵工业》
CAS
CSCD
北大核心
2001年第9期21-25,共5页
Food and Fermentation Industries
基金
广东省自然科学基金资助项目 (No 990 897)
