Influence of Bacterial Cellulose (nata) on the Physicochemical and Sensory Properties of Frankfurter

The physicochemical and sensory characteristics of pork frankfurters containing different levels (10% to 30%) of bacterial cellulose (nata) were evaluated. Emulsion stability of the raw meat batter decreased with the addition of nata. For nata‐added treatments, increasing levels of nata in frankfurters resulted in decreased textural hardness and shear values. Sensory results indicated that N10 and N20 had significantly higher firmness scores than N30 and control. However, juiciness score did not differ for all treatments. Incorporation of nata at lower levels (10% to 20%) did not have detrimental effects on the physicochemical, textural, sensory, and microbiological properties of regular‐fat frankfurters. Addition of a higher level (30%) of nata essentially produced comparable sensory properties to the control, but lower levels of nata in frankfurters yielded higher sensory firmness and instrumental hardness values. Based on the composite results, manufacture of regular‐fat frankfurter containing 10% to 20% high‐fiber nata resulted in product quality comparable to the control.     

保健大豆冰淇淋的研制

研究了以大豆为主要原料,添加山药及椰果制成冰淇淋的配方和工艺.这种冰淇淋是一种风味独特、品质优良、老少皆宜,集多功能于一体的新型保健食品.     

椰子纳塔发酵条件研究

研究了一株醋酸杆菌（Ａｃｅｔｏｂａｃｔｅｒｓｐ．）在椰子水培养液中发酵产生纳塔（ｎａｔａ）的适宜工艺条件：蔗糖７％,ＮＨ４Ｃｌ０．４％,ＫＨ２ＰＯ４０．２％,ＭｇＳＯ４０．０２％,ＣａＣｌ２０．０２％,ＦｅＳＯ４０．０００５％（Ｗ／Ｖ）,酵母膏０．０５％,柠檬酸０．０２％,椰子水５０％～１００％（Ｖ／Ｖ）,ｐＨ４．０,用大口容器盛装,３０℃静置培养１４～１８ｄ。在此条件下,于５００ｍｌ烧杯中发酵１６ｄ,最高可收获１８２ｇ重,３．３ｃｍ厚的纳塔,其外观和品质均符合纳塔食品的加工要求。     

纳塔生产菌培养条件的研究

该文主要研究了纳塔生产菌的发酵生产条件的优化.纳塔是醋酸菌发酵生产的细菌纤维素,作为一种健康天然食品,被广泛应用于罐头、果冻等食品中.以纳塔为代表的细菌纤维素近几年越来越受到人们的重视,成为国内生物材料研究的热点.试验从样品发酵液中筛选出了纳塔生产菌,得到了优化的纳塔发酵培养基组成为:葡萄糖2％,蛋白胨1％,酵母膏0.5％,柠檬酸0.1％,磷酸氢二钠0.5％,纳塔的产量达到了9.9g/L.     

Characteristics of thin‐layer drying and rehydration of nata de coco

Nata is white gelatinous bacterial cellulose produced by Acetobacter aceti ssp. xylinum through fermentation of coconut water. Drying behaviour of nata de coco was conducted with a hot air dryer for a temperature range of 50–90 °C. The experimental data obtained were fitted into seven empirical and/or semi‐theoretical thin‐layer drying models using nonlinear regression analysis. Results showed that Logarithmic model, Wang and Singh model fitted better than Verma et al. model although all these three models were suitable for predicting the drying process of nata de coco. The rehydration capacity was lost severely when the moisture content of the samples was nearly zero, but it can almost rehydrate to its initial state when the moisture content was above 8%. The drying kinetic properties and rehydration capacity of nata de coco indicated that most of the moisture in nata de coco was free water.     

椰纤果热风干燥工艺优化研究

对椰纤果的热风干燥工艺条件和利用渗透法对椰纤果的结构修饰进行研究,通过单因素及正交试验探讨不同热风及结构修饰条件对椰纤果的复水性、复水后的质构等的影响。结果表明,热风干燥椰纤果的最佳工艺条件为干燥温度60℃、浸泡处理1.0%卡拉胶浸泡、浸渍固液比1∶2(m∶V)、浸渍时间为20h。     

压缩椰纤果浓缩椰奶的工艺研究

研究了一种椰奶浓缩的新方法,即采用压缩的椰纤果浓缩椰奶。通过试验研究出其适宜的浓缩工艺条件为：椰纤果规格1.5cm × 1.5cm × 1.5cm,椰纤果压缩比为0.3,压缩椰纤果与椰奶的用量为1:3(W/W),在25～30℃慢速搅拌的情况下浓缩30min,浓缩效率最高。在此条件下,初始干物质含量为39.0% 的椰奶,经浓缩后干物质含量可达到72.8%,脂肪含量为66.9%,浓缩椰奶回收率为84.0%。此方法可以用于乳化后的椰奶浓缩,且效果更好。