喷雾干燥制备枸杞粉工艺研究

以枸杞酱为原料,通过喷雾干燥制备枸杞粉,采用单因素和正交试验相结合确定最佳工艺。试验结果表明,当麦芽糊精添加量为50％、固形物浓度为8％、进风温度为180℃、出风温度为80℃时,喷雾干燥效果最好,在此条件下喷雾制备枸杞粉的出粉率为29．1％。     

Liposomes encapsulating beta‐carotene produced by the proliposomes method: characterisation and shelf life of powders and phospholipid vesicles

The objective of this study was to investigate the feasibility of producing proliposomes incorporating beta‐carotene by spray drying and to assess the capacity of the liposomes produced by the hydration of the dry phospholipid particles to preserve the encapsulated carotenoid. Powders containing beta‐carotene, hydrogenated phosphatidylcholine and sucrose were obtained and characterised in terms of crystallinity, morphology, thermal behaviour, density, solubility and hygroscopicity. The preservation of beta‐carotene in the powder was evaluated for two storage conditions under normal atmosphere and vacuum. The proliposome was highly soluble, with all components embedded in the matrix and capable of preserving more than 90% of the incorporated beta‐carotene for 60 days of refrigerated storage under vacuum. The liposome dispersions maintained their average size, polydispersity index and zeta potential for 100 days of storage. After 60 days, the degradation of encapsulated beta‐carotene was minimal, and the colour of the dispersions was preserved.     

Spray Drying of Fruit and Vegetable Juices—A Review

The main cause of spray drying is to increase the shelf life and easy handling of juices. In the present paper, the studies carried out so far on spray drying of various fruits and vegetables are reported. The major fruit juices dried are mango, banana, orange, guava, bayberry, watermelon, pineapple, etc. However, study on vegetable juices is limited. In spray drying, the major optimized parameters are inlet air temperature, relative humidity of air, outlet air temperature, and atomizer speed that are given for a particular study. The juices in spray drying require addition of drying agents that include matlodextrin, liquid glucose, etc. The drying agents are added to increase the glass transition temperature. Different approaches for spray dryer design have also been discussed in the present work.     

枸杞粉喷雾干燥工艺优化研究

采用喷雾干燥法制备枸杞粉,研究麦芽糊精添加量对喷雾干燥工艺中粘壁情况及枸杞粉集粉率、水分含量和流动性的影响。在单因素实验的基础上,以枸杞粉集粉率为响应值,利用响应面法优化进料浓度、进风温度和雾化器转速,同时考察了最优工艺下枸杞粉的集粉率、水分含量和流动性。结果表明:枸杞粉喷雾干燥最优工艺参数为麦芽糊精添加量25%,进料浓度22%,进风温度150℃和雾化器转速270r/s,在最优喷雾干燥工艺参数下得到枸杞粉集粉率为47.55%,水分含量为4.11%和流动性为9.2cm。该研究结果为枸杞粉喷雾干燥工艺的完善提供了一定的参考。     

Spray drying conditions for orange juice incorporated with lactic acid bacteria

This work aimed to develop an orange juice powder by spray drying with lactic acid bacteria (Lactobacillus plantarum 299v and Pediococcus acidilactici HA‐6111‐2), testing their survival both during drying and storage (room temperature and 4 °C). Initially, the best conditions for spray drying were chosen to allow the best survival of each LAB: (i) inlet air temperature of 120 °C and (ii) 0.5:2 ratio of the orange juice soluble solids and drying agent added (prebiotics: 10 DE maltodextrin or gum Arabic). Survival of LAB was not affected by drying process, and it was higher when cultures were stored at 4 °C. A slightly higher protection was conferred by 10 DE maltodextrin, in the case of L. plantarum and at 4 °C. Pediococcus acidilactici was more resistant during storage at 4 °C, with logarithmic reductions lower than 1 log‐unit. It was demonstrated that it is possible to produce a functional nondairy product, orange juice powder supplemented with prebiotic compounds, containing viable LAB for at least 7 months, when stored at 4 °C.     

复配麦芽糊精及β-环糊精对喷雾干燥甘薯全粉品质的影响

为提高喷雾干燥所制备出甘薯全粉的品质,本研究探讨了麦芽糊精及β-环糊精作为助干剂对产品品质的影响.通过比对麦芽糊精及β-环糊精单独及复配使用后,甘薯全粉的出粉率、营养组分及特性(色泽、粒度、流动性、水合特性、抗氧化成分以及抗氧化力)变化,得出甘薯全粉喷雾干燥的最优助干剂配方.结果表明,采用最优复合组合的添加比例为20g...     

壳聚糖香精微胶囊的制备

壳聚糖无毒、无害,易于生物降解,不污染环境,是一种理想的微胶囊壁材。以壳聚糖为壁材,采用喷雾干燥工艺对香精进行微胶囊化,通过对乳液稳定性能的测定评价了大豆卵磷脂、蒸馏单甘酯和吐温6 0复配乳化剂的性能,系统的探讨了壁材浓度、乳化剂用量、芯壁比等对微胶囊化效果的影响,确定了最佳工艺条件;测试并分析了微囊的形貌、包埋率和释放率等质量指标。     

新型番茄红素微胶囊的制备及稳定性评价

分别以菊粉、麦芽糊精、海藻糖为壁材,以包埋番茄红素的乳清分离蛋白-壳聚糖双层乳液为芯材,使用喷雾干燥法制备番茄红素微胶囊。探究不同壁材、芯壁质量比对微胶囊包埋率、微观形貌、贮藏稳定性以及在酸性饮料模拟介质中稳定性、体外模拟释放的影响,以确定最佳新型番茄红素微胶囊的制备条件。结果表明：不同微胶囊的包埋率稳定在72.97%～81.90%之间,所有样品均呈现出典型的球状结构;随着芯壁质量比的降低,微胶囊中的番茄红素在贮藏期和酸性环境下的物化稳定性均明显增加;与菊粉相比,以麦芽糊精和海藻糖为壁材的微胶囊可实现番茄红素在模拟胃肠液中的控制释放。本研究有助于进一步开发番茄红素递送载体,从而促进其产业化应用。     

山楂果原花青素的微胶囊化研究

研究了山楂果原花青素的微胶囊化工艺,以提高其稳定性。结果表明:以麦芽糊精、阿拉伯胶为复合壁材的微胶囊化效果最佳;通过单因素和正交试验确定微胶囊化工艺为,微胶囊化温度30℃,微胶囊化时间1h,芯壁材质量比为3∶7,复合壁材阿拉伯胶质量分数为40%,螯合剂EDTA-2Na添加量占芯材和壁材总质量的0.02%,总固形物含量为250g/L。在此微胶囊化工艺下喷雾干燥所得产品的微胶囊化效率为95.9%,微胶囊产率为90.6%。通过高效液相色谱(HPLC)检测,山楂果原花青素微胶囊化前后主要成分未发生改变,且稳定性得以提高。     

果胶-壳聚糖多层修饰脂质体的制备及配方优化

本研究利用壳聚糖、果胶对常规脂质体进行先后修饰构建果胶-壳聚糖多层修饰脂质体（pectin-chitosan coated liposomes,Pe-Ch-Liposomes）,以番茄红素为模型药物,系统研究了主要因素对多层修饰脂质体包封率和浊度的影响,并以包封率为指标优化配方。结果表明果胶溶液与壳聚糖溶液的体积及浓度配比均对多层修饰脂质的包封率及浊度有一定的影响,且多层修饰过程可降低由卵磷脂与胆固醇质量比引起的包封率及浊度的差异。正交实验结合单因素分析确定最佳配方为果胶壳聚糖体积比为2∶1,果胶-壳聚糖总浓度为0.2%∶0.2%,卵磷脂与胆固醇质量比为5∶1,番茄红素添加量为2.5 mg。在此条件下制备的多层修饰脂质体的包封率（97.8%）显著高于常规脂质体的包封率（85.4%）;粒度分布较为集中,平均粒径为1870.4 nm,多分散系数为0.231。      

A feasibility study of Lactobacillus plantarum in fruit powders after processing and storage

The aim of this study was to develop fruit powders (apple, banana and strawberry) enriched with a probiotic strain (Lactobacillus plantarum 299v). Two methodologies were proposed: (i) drying of the fruit with probiotic culture incorporated (by convection) or (ii) drying of fruit (by convection) and addition of spray‐dried probiotic culture. In the first methodology, processing caused a notable reduction in probiotic viable counts in apple, but this reduction was lower during drying of banana and strawberry. A large reduction in viable cells was also recorded during storage. In the second methodology, the survival of L. plantarum 299v was considerably higher during spray‐drying, and fruit powders with a microbial content suitable for a probiotic food (10⁸–10⁹ cfu g^?1) were obtained. The fruit powders incorporating L. plantarum 299v can be stored at 4 °C or at room temperature, for at least 3 months. This preliminary study demonstrated that fruit powders are good carriers of probiotic cultures, but the techniques used to produce them should be carefully considered.     

喷雾干燥法制备面粉改良剂茶多酚微胶囊研究

以面粉改良剂茶多酚为研究对象,选用海藻酸钠、壳聚糖以及氯化钙为包埋壁材,采用喷雾干燥法对茶多酚进行微胶囊化研究。通过单因素实验以及响应面优化分析得出如下结论,喷雾干燥最佳技术条件:进风温度180℃,空气流量750L/h,出风温度100℃。茶多酚最佳包埋参数为:复合壁材比例海藻酸钠2.5%、壳聚糖0.8%、氯化钙4.5%,芯材与壁材质量比为2∶1,最大包埋率为73.8%。包埋颗粒近似球形,直径介于2～10μm之间,分布均匀无粘连。微胶囊稳定性实验表明,在5℃下,茶多酚较为稳定,最佳储存期为22d。