南瓜胡萝卜发酵乳饮料的工艺研究

以南瓜、胡萝卜为主要原料,经预处理、软化、打浆等工序,添加各种辅料,采用单因素试验和响应面设计,确定南瓜胡萝卜发酵乳饮料生产的最佳配方和工艺条件.结果表明,饮料的最佳配方为南瓜汁70％,胡萝卜汁30％,脱脂乳粉2.5％,安赛蜜0.025％,复合稳定剂0.18％.饮料的最佳工艺条件为接种量3％,发酵温度42℃,发酵时间4h.     

新疆地产胡萝卜汁乳酸菌发酵饮料的研制

以冷榨胡萝卜原汁为原料,用保加利亚乳杆菌和嗜热链球菌为菌种。采用4因素3水平正交实验方法,最终确定胡萝卜发酵饮料种子扩大液,发酵液及饮料口感稳定性的最佳工艺配方。实验结果显示种子扩大液的最佳配方:3%葡萄糖,8%脱脂乳,3%接种量;发酵液最佳配方为发酵温度43℃,发酵时间24h,接种量5%;发酵饮料调配最佳配方:蔗糖7%,柠檬酸0.03%,稳定剂CMC-Na0.4%、黄原胶0.2%。     

胡萝卜醋发酵工艺的试验研究

以胡萝卜为原料，对胡萝卜醋的发酵工艺进行了试验研究。结果表明最佳发酵工艺条件是：酒精发酵时酵母菌的适宜生长温度为28～30℃，发酵时间5～6d。醋酸菌的适宜生长温度为33℃，发酵时间为40d。     

发酵蛋乳饮料的工艺研究

以全蛋和牛乳为主要原料,研制出一种营养丰富、均衡、有鸡蛋风味的乳酸饮料。在研究中确定了主要工艺流程,并通过发酵条件试验、物料配比确定、稳定剂筛选和正交实验,选出最佳配方,并对产品做理化测定。     

酶解技术在马蹄胡萝卜汁生产中的应用研究

用糖化酶、果胶酶酶解法代替传统榨汁法分别酶解马蹄，胡萝卜以提高出汁率，试验结果表明，在酶解条件下马蹄、胡萝卜出汁率分别提高２４％、１２％。     

蓝莓发酵乳饮料加工工艺研究

研究具有营养保健功能的蓝莓乳酸菌饮料的加工工艺,旨在为该饮料的工业化生产提供一定的技术参考。通过正交试验确定了蓝莓乳酸菌饮料的最佳配方;通过耐酸CMC-Na、果胶、海藻酸钠的单因素稳定性实验,在此基础上采用正交试验,以沉淀率为指标确定三种稳定剂的最佳添加量配比;蓝莓发酵乳饮料最佳配方:酸乳35%,蓝莓果汁25%,蔗糖4.5%,阿斯巴甜0.0225%,此时饮料酸甜比适中,口感最好;采用复合稳定剂可以提高稳定效果,当果胶、耐酸CMC-Na、海藻酸钠添加量分别为0.2%、0.1%、0.15%时,饮料稳定性最好。按照上述方法,可以得到风味较好、营养丰富的蓝莓发酵乳饮料。     

发酵型黑莓乳饮料工艺的研究

建立以黑莓清汁、鲜牛奶为主要原料,生产发酵型黑莓乳饮料的工艺,通过实验优化产品配方与工艺参数。结果表明,果胶酶用量0.05%,酶解时间1.5 h,酶解温度为50℃。     

桑果保健醋发酵工艺研究

桑果营养丰富,且具有多种保健功能,以桑果、糯米为原料,采用液态发酵法,研制出风味独特、营养丰富的桑果保健醋,对节约粮食资源、开发新型保健调味品具有重要意义。     

发酵型米酒乳饮料工艺的研究

以传统民间食品米酒为发酵剂,牛乳为主要发酵原料,通过单因素试验、正交试验,研制成一种风味独特、营养丰富的发酵型米酒乳饮料。实验结果表明:米酒接种量7%,白砂糖添加量12%,复合稳定剂加入量0.2%为最佳发酵米酒乳配方。     

草莓燕麦发酵乳饮料的工艺研究

以感官评分为考察指标,采用单因素实验分析了燕麦发酵乳、草莓原浆与稳定剂黄原胶添加量对该乳饮料的最佳配比的影响。再通过正交试验优化草莓燕麦发酵乳饮料工艺参数。结果表明：影响草莓燕麦发酵乳饮料工艺参数的因素为燕麦发酵乳添加量>草莓原浆添加量>稳定剂黄原胶添加量。最佳配方为以乳饮料100 g为基准,燕麦发酵乳添加量50%,草莓原浆添加量25%,黄原胶添加量0.25%。此时草莓燕麦发酵乳饮料感官评分为95,黏度为732.64 mPa·s,酸度为71.42。     

仙人掌汁乳酸发酵饮料的研制

本研究的目的是制造仙人掌汁乳酸发酵饮料 ,主要侧重于仙人掌苦涩味脱除 ,发酵原液的配制 ,菌种配比的选择等方面进行探讨 ,以摸索出最佳工艺条件 ,生产出具有仙人掌汁独特风味的乳酸发酵饮料。     

纯天然西瓜汁生产工艺研究

研究采用新式的杀菌工艺,用低压低温杀菌(65℃、0.095MPa、沸腾状态7min)氮气回充的方式对纯天然西瓜汁进行杀菌处理,经过处理的西瓜汁在少氧的状态下进行杀菌,不仅极大地使维生素和其他有益成分得以保留,保证很好的色泽,而且达到了很好的杀菌效果。在杀菌过程中原有加热杀菌工艺中不可避免的加热煮熟气味得到很好的避免和去除,西瓜汁原有风味得到很好的保持,回充氮气防止了西瓜汁中易氧化成分的损失,抑制残留微生物的生长繁殖。在不添加任何食品添加剂的情况下,西瓜汁的贮存期可以达到12个月,达到了工业生产和商品货架期的要求。     

乳酸发酵胡萝卜汁的研制

以胡萝卜汁为基质,对若干乳酸发酵菌株进行发酵性能及生长曲线的研究,确定了以嗜酸乳杆菌为主要发酵菌种.并使之与耐氧驯化的青春双歧杆菌混合培养,表现出良好的共发酵特性.在胡萝卜汁中加入食盐1%,蔗糖2%,豆浆7%,接种量1%,种间比(La∶Ba)1∶1,在37℃下发酵24h,活菌总数可达1.2×109个/ml.以此培养液为发酵剂,对胡萝卜汁进行发酵,即可制得色泽纯正、风味优良、质地细腻的乳酸发酵胡萝卜汁.最佳发酵参数为接种量2%,砂糖4%,食盐0.3%,37℃,16h.     

葫萝卜汁悬浮稳定性的研究

通过添加稳定剂对胡萝卜汁进行稳定化处理,研究了六种单一稳定剂对胡萝卜汁稳定性的影响.通过筛选,将黄原胶、瓜尔豆胶和海藻酸钠这三种稳定剂进行复合,结果表明:黄原胶、瓜尔豆胶和海藻酸钠用量均为0.15%时,胡萝卜汁达到很好的稳定效果.     

Antimicrobial properties of pepsin-digested lactoferrin added to carrot juice and filtrates of carrot juice

The objective of this study was to determine the antimicrobial activity of pepsin-digested lactoferrin added to carrot juice and filtrates prepared from carrot juice. Lactoferrin isolated from raw skim milk was digested by pepsin for 4 h at pH 3. The digest of lactoferrin was lyophilized, and the antimicrobial activity of the digests was determined in peptone-yeast-glucose broth, carrot juice, permeate from carrot juice, and the dialysate of carrot juice permeate using Escherichia coli (American Type Culture Collection strain 35343) as the test organism. Growth of E. coli and the inhibitory effect of the peptide were greater in peptone-yeast-glucose broth at pH 7 than at pH 4. The peptic digest of lactoferrin did not have antimicrobial properties in carrot juice at concentrations of less than 10 mg/ml of juice. Carrot juice was filtered through a membrane with a molecular weight rejection of 10,000 or 500 Da, and the permeate was dialyzed against distilled water. Growth of E. coli was delayed in the filtrate by 5 mg but not by 1 mg of the peptic digest of lactoferrin per ml of filtrate. Bacterial counts of the control and experimental samples were not significantly different after 24 h of incubation. The peptic digest of lactoferrin at a concentration of 5 mg of digest per ml of dialysate was bacteriostatic toward E. coli after 24 h of incubation at 23 degrees C. Dialysis of permeate caused a percentage reduction in cation concentration in the permeate ranging from 69.23% (Co) to 99.32% (Na). The antimicrobial activity of lactoferrin added to carrot juice was probably inhibited by cations.     

Kinetics of amino acid loss in carrot juice concentrate during storage

The loss of total amino acid (TAA) and individual leading amino acids (LAAs) in 20, 40, 60 Brix carrot juice concentrate (CJC) stored at −18 C, 0, 25 and 37 °C is investigated. The LAAs are histidine, proline, serine, aspartic acid, glutamic acid, arginine and alanine in CJC, their summation account for about 86 percent in TAA. As the storage temperature increase and the storage time extend, the loss of TAA and LAAs concentration is significantly increased (P<0.05). The higher the storage temperature such as 37 °C is, the greater the loss of TAA and LAAs concentration is. After 6 month storage, the TAA loss percentage is 72.85, 70.13 and 78.32 in 20, 40, 60 Brix CJC at 37 °C, respectively. The loss kinetics of TAA concentration is well fitted using the first-order reaction and the zero-order reaction. As compared to the zero-order reaction, the first-order reaction provides a perfect fit with better model performance parameters, which included accuracy factor (Af), bias factor (Bf), the sum of the squares of the differences of the natural logarithm of observed and predicted values (SS), and root mean square error (RMSE). Similarly, the loss kinetics of LAAs also followed the first-order reaction. After 6 months storage at 37 °C, the loss percentage of histidine, proline, serine, aspartic acid, glutamic acid, arginine and alanine is 95.46, 93.52, 78.05, 73.14, 70.35, 67.14 and 62.72 in 60 Brix CJC, respectively, the histidine is the most reactive one of LAAs in the study.     

胡萝卜制汁工艺的研究

介绍了胡萝卜原汁生产工艺对胡萝卜出汁率,原汁风味和β－胡萝卜素保存率的影响以及原汁贮条件对β－胡萝卜素含量的影响。     

胡萝卜汁的生产技术

<正> 市场上可见多种不同的胡萝卜汁混合饮料,当中有加入橙汁、菠萝汁、柠檬汁、水和糖的产品,而胡萝卜汁含量一般为2～10%左右。柠檬汁可在产品中产生酸化作用,如添加维生素,还可提高产品的营养价值。此外,市场上也有出售含99%胡萝卜汁和1%柠檬汁的混合饮料,其价格一般是其他胡萝卜汁混合饮料的3倍。     

姜汁对酸奶发酵性能的影响

以保加利亚乳杆菌（Lb.）、嗜热链球菌（St.）为发酵菌种，对含有不同姜汁添加量的姜汁牛奶在42℃条件下进行发酵。在发酵过程中对酸奶的滴定酸度、pH、粘度、活菌数等发酵性能进行测定，并对成品进行感官评定，从而得出姜汁在酸奶中的最佳添加量。结果表明：姜汁添加量在30%以上时对发酵过程中的滴定酸度、pH、粘度有显著影响；姜汁添加量在10%以下时对Lb.、St.的生长影响不大，但添加量超过10%时对Lb.、St.的生长有显著的抑制作用，通过感官评分确定姜汁最佳量为10%。