亲水胶体对牛皮胶原蛋白肠衣膜性能的影响

为了研究亲水胶体对牛皮胶原蛋白肠衣膜性能的影响,首先以软木纤维素为代表,研究其添加量对胶原蛋白肠衣膜机械性能、溶胀率、水接触角、变性温度等方面的影响;并进一步考察分别添加7种亲水胶体(软木纤维素、微晶纤维素、竹纤维素、魔芋胶、瓜尔胶、羟丙基甲基纤维素和海藻酸丙二醇酯)对肠衣膜性能的影响。结果表明,软木纤维素的添加可使肠衣膜的湿抗拉强度明显增加,溶胀率下降,热收缩率略微降低,热稳定性提升;但当纤维素加入量过高时,肠衣膜的透明度较差,故综合得到软木纤维素的最佳添加量为0.5%(g/g牛皮干基重)。加入海藻酸丙二醇酯肠衣膜的干断裂延伸率最小,约为9%;加入魔芋胶肠衣膜的透明度达到最大值,为35;加入瓜尔胶和魔芋胶的肠衣膜具有最低的热收缩率,约30%。加入微晶纤维素肠衣膜的机械性能、溶胀率、热收缩率及透明度均优于软木纤维素和竹纤维素;FTIR光谱结果表明,7种亲水胶体不会对肠衣膜的化学键产生显著影响。通过添加相应的亲水胶体可获得对牛皮胶原蛋白肠衣膜特定性能的改善。

Effects of Hydrocolloids on the Properties of Bovine Skin Collagen Casing Films

To study the effects of hydrocolloids on the properties of collagen casing films made from bovine skin, the cork cellulose was firstly chosen as an example. The effects of cork cellulose addition on the mechanical properties, swelling ratio, water contact angle, denaturation temperature and the like properties of collagen films were investigated. Moreover, the influences of 7 different hydrocolloids (cork cellulose, microcrystalline cellulose, bamboo cellulose, konjac gum, guar gum, hydroxypropyl methylcellulose, propylene glycol alginate) on the properties of collagen films were further analyzed. The results showed that the addition of cork cellulose could improve the tensile strength at wet state and the thermal stability, which decrease the swelling rate and heat shrinkage rate. But the transparency of film would highly decreased if the addition was that high. So optimum addition amount of cork cellulose was set at 0.5% (g/g dry weight of bovine skin). The film added with propylene glycol alginate had the lowest elongation at break of 9%, the one with konjac gum showed the highest transparency of 35, and the ones with guar gum and konjac gum showed the lowest heat shrinkage of 30%. Moreover, the mechanical properties, swelling rate, heat shrinkage and transparency of film containing microcrystalline cellulose were better than that of cork cellulose and bamboo cellulose. FTIR results showed that there were no apparent changes on the chemical bonds of films in the presence of hydrocolloids. Above all, the improvement in some given properties of bovine skin collagen casing films could be obtained by adding one of the corresponding hydrocolloids.