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提高酸奶稳定性的研究 总被引:10,自引:0,他引:10
<正> 目前市场上的酸奶有发酵型和调配型两大类,调配型酸奶以其投资少,生产工艺简单,可调配成各种风味,在酸奶市场上占相当大的比重。目前市场上调配型酸奶仍存在不少质量问题,稳定性差是调配型酸奶最严重的问题,酸奶放置2~3个月便出现沉淀,严重影响酸奶的保质期。至于怎样提高酸奶的稳定性,很少有这方面的报道。 酸奶的稳定性受到多方面因素的影响, 相似文献
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The influence of different sweeteners on the quality of yoghurt was studied using a sucrose sweetened yoghurt as the reference. The alternative sweeteners used were xylitol, sorbitol, fructose, cyclamate and saccharin. The sweeteners were added to the yoghurt either prior to or after incubation. The influence of xylitol and sorbitol were studied more closely by investigating their growth retarding effects on the yoghurt culture. The quality of the yoghurt varieties was evaluated by pH, titratable acidity, viscosity, microbiological quality, sensory properties and storage stability.
All the sweeteners used were suitable for sweetening of yoghurt after incubation. However, saccharin could be used only when mixed with xylitol to cover its disturbing bitter aftertaste when used alone.
Sweetening with sorbitol prior to incubation was problematic. To obtain a suitable sweetness of the yoghurt 15% of sorbitol had to be added. This amount retarded the growth of the yoghurt culture so greatly that no acid, aroma or coagulation was formed in the product. Even a concentration 7% made the yoghurt significantly different from the normal yoghurt. The sweetness of yoghurt prepared with less than 7% of sorbitol is very slight. Consequently, sorbitol is not suitable for use as the only sweetener in pre-sweetened yoghurt. However, its use was possible in combination with sucrose. Xylitol proved to be a good yoghurt sweetener for pre-incubation sweetening, in spite of a slight retarding effect on the growth of the bacteria. At 8% concentration, which was the most preferred, the retarding effect of xylitol was negligible. 相似文献
All the sweeteners used were suitable for sweetening of yoghurt after incubation. However, saccharin could be used only when mixed with xylitol to cover its disturbing bitter aftertaste when used alone.
Sweetening with sorbitol prior to incubation was problematic. To obtain a suitable sweetness of the yoghurt 15% of sorbitol had to be added. This amount retarded the growth of the yoghurt culture so greatly that no acid, aroma or coagulation was formed in the product. Even a concentration 7% made the yoghurt significantly different from the normal yoghurt. The sweetness of yoghurt prepared with less than 7% of sorbitol is very slight. Consequently, sorbitol is not suitable for use as the only sweetener in pre-sweetened yoghurt. However, its use was possible in combination with sucrose. Xylitol proved to be a good yoghurt sweetener for pre-incubation sweetening, in spite of a slight retarding effect on the growth of the bacteria. At 8% concentration, which was the most preferred, the retarding effect of xylitol was negligible. 相似文献
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以鲜乳和乳清蛋白浓缩物为主要原料再配合其他辅料制成了一种新型发酵乳制品-酸乳酪(蛋白质量分数4.5%)。通过对样品硬度、拉伸力、脱水收缩作用敏感性、黏度、持水力等参数的测定和感官评价,确定了合理的产品配方,并对产品质量作了评价与分析。结果表明,当乳清蛋白浓缩物为3.7%,白砂糖7.0%,明胶0.3%,果胶0.05%(均为质量分数,下同),选用Str.Lactis and Str.cremoris作为发酵剂,在30℃条件下发酵13h即可得到优质的酸乳酪,该产品具有营养丰富,稳定性好和感官品质佳等特点。 相似文献
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对螺旋藻的脱腥工艺进行了探讨,通过比较萃取法和遮蔽法的脱腥效果,确定了螺旋藻脱腥的最佳工艺为萃取法,萃取剂为体积浓度95%的乙醇。以螺旋藻的添加量、菌种添加量、发酵温度、发酵时间为参数,采用单因素试验和正交试验对螺旋藻酸乳的加工制作工艺进行了研究。确定了其原料的配比与工艺条件为:全脂乳粉10.2 g/100g、白砂糖8 g/100g、菌种添加量5 g/100g、螺旋藻添加量0.2 g/100g、发酵温度38℃、发酵时间6 h。在此条件下得到的产品呈浅绿色,且色泽均匀,凝乳状态完全,无乳清析出,口感细腻,品质较好。 相似文献
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