负载Mg^(2+)乳液凝固剂对富硒豆腐品质的影响

Effect of Mg^(2+)loaded emulsion coagulant on the quality of selenium-enriched tofu

为研究负载Mg^(2+)的乳液凝固剂在富硒豆腐点卤加工中的应用,以MgCl_(2)制备的富硒豆腐为对照,以产量和硒保留率、脱水率和水分状态、质构特性为评价指标,探讨不同Mg^(2+)释放速率对豆腐品质和凝胶结构的影响。结果表明:乳液凝固剂中Mg^(2+)的释放速率对富硒豆腐的品质和硒保留率影响显著;与常规的MgCl_(2)豆腐相比,在8000 r/min释放条件下,富硒豆腐的孔洞明显减少,凝胶网络更加均匀致密,脱水率降低了32.94%,水分含量、产量、硒保留率分别增加了6.42%、26.80%、10.70%,质构特性也有所改善;在6000 r/min释放条件下,尽管富硒豆腐的水分含量、产量和硒保留率分别增加了19.25%、56.18%、44.64%,但是外观结构松软坍塌,凝胶强度差,硬度显著降低了45.78%,脱水率显著提高了51.06%;当释放条件剪切速度>10000 r/min时,富硒豆腐的产量、水分含量、质构特性和硒保留率并未有显著的改善。本研究旨在实现乳液凝固剂应用于豆腐点卤环节,为富硒豆腐的工业化生产提供理论依据。

This study investigated the application of emulsion coagulant loaded with Mg^(2+)in the coagulating process of selenium-enriched tofu.The tofu prepared by MgCl_(2) was used as the control.The effects of Mg^(2+)release rate on the quality and gel structure of tofu were studied using yield,selenium retention,water change and texture characteristics as evaluation indexes.The results showed that the release rate of Mg^(2+)in the emulsion coagulant had a significant effect on the quality and selenium retention rate of selenium-en-riched tofu.In comparison to common MgCl_(2) tofu,Under 8000 r/min,the pores of selenium-enriched tofu were significantly reduced,the gel network was more uniform and dense,the water content was increased by 6.42%,the yield was increased by 26.80%,and the selenium retention rate was increased by 10.70%.Under 6000 r/min,although the moisture content,yield and selenium retention rate of selenium-enriched tofu increased by 19.25%,56.18%and 44.64%,respectively,the appearance structure was soft and col-lapsed,the gel strength was poor,and the hardness,dehydration rate decreased by 45.78% and 51.06%.When the release condition is faster than 10000 r/min,production,moisture content,texture and selenium retention rate of selenium-enriched tofu were not significantly improved.These findings are expected to re-alize the application of emulsion coagulant in the solidification process of tofu and providing a theoretical basis for the industrial production of selenium-rich tofu.