Effects of storage in slurry ice on the microbial,chemical and sensory quality and on the shelf life of farmed turbot (Psetta maxima)

The application of slurry ice, a binary mixture of small spherical ice crystals surrounded by seawater at subzero temperature, is a potentially new preservation method for farmed turbot (Psetta maxima), a flat fish species of increasing commercial interest. Comparative biochemical, microbiological and sensory analyses were carried on turbot specimens stored in either slurry ice or flake ice for up to 40 days. The results obtained in the sensory analysis correlated well with the observed chemical and microbial changes. Storage of turbot in slurry ice resulted in a slowing-down of the nucleotide degradation pathway and lipid oxidation mechanisms. A good stabilisation of the high molecular weight protein fraction of turbot muscle was also achieved as a consequence of storage in slurry ice. A slower production of both trimethylamine and total volatile bases was also observed. Likewise, low levels of total aerobes, anaerobes, coliforms, and proteolytic bacteria were attained. The application of slurry ice to farmed turbot is advisable to achieve better quality maintenance during storage and distribution.     

南极冰鱼外裹糊鱼块在冻藏过程中品质变化

以南极冰鱼为原料,经预处理后制得外裹糊鱼块,研究其冻藏过程中品质变化及货架期,以菌落总数、挥发性盐基氮(TVB-N)、硫代巴比妥酸(TBA)值、pH值、色泽及感官评价等为评价指标。结果表明:随着冻藏时间的延长,南极冰鱼外裹糊鱼块的菌落总数呈先下降后上升趋势,TVB-N含量、TBA值和pH值均呈上升趋势,色泽亮度值L*、白度值以及感官评分均呈下降趋势,其冻藏货架期为6个月,超过6个月时,其品质严重下降,达到不可食用阶段。     

电子舌对冰葡萄酒的区分辨识研究

应用电子舌对冰葡萄酒样品进行区分辨识,考察电子舌对不同种类冰葡萄酒样品的辨别能力。采用主成分分析法和判别因子分析法对实验数据进行处理。结果表明,在主成分得分图和判别因子图上,各冰葡萄酒样品的落点在各自的区域范围内而互不干扰,说明电子舌能够将各种不同种类和同一种类经橡木桶不同贮藏时间的冰葡萄酒样品很好地区分开。     

结晶原理和冰淇淋中的结晶现象

阐述了结晶原理在冰淇淋凝冻中的应用,详细叙述了结晶的目的和方法,晶核的形成原理,结晶体的成长,多晶现象,以及冰淇淋中的结晶现象.     

芦荟冰淇淋的研制

在冰淇淋中添加芦荟凝胶粉，使冰淇淋具有芦荟的保健和养颜特性，并能提高冰淇淋混合料液的粘度，冰淇淋的膨胀率和抗融性。     

Recrystallization in Model Ice Cream Solutions as Affected by Stabilizer Concentration

Ice recrystallization rates in simple aqueous solutions comprising fructose and a hydrocolloid stabilizer were measured. The stabilizers were an enzyme-modified guar and a non-gelling high methoxy pectin. The stabilizer concentration dependence of the recrystallization rates for both materials was similar in that increasing the concentration resulted in decreasing rates until a point is reached where further addition had no additional effect. That recrystallization rates were reduced by both gelling and non-gelling stabilizers was strongly suggestive that gelation was not a requirement for recrystallization inhibition and another more specific mechanism applies, for example a weak interfacial effect such as adsorption or blocking. This behavior was also seen with locust bean gum and guar and provided further empirical evidence to support the hypothesis that stabilizers adsorb to ice crystal surfaces.     

绿芦笋木糖醇黑米冰淇淋的研制

绿芦笋具有许多药用保健功能,黑米是我国稻米中珍品,营养价值极高,以黑米为主要辅料.用木糖醇代替部分蔗糖,生产出低糖具有营养保健性的新产品一绿芦笋木糖醇黑米冰淇淋,并对工艺中黑米粉的处理、杀茵、均质、老化、凝冻等操作对冰激淋质量的影响进行初步探讨.研究表明:绿芦笋木糖醇黑米冰淇淋新产品配方为绿芦笋汁5kg、鲜牛奶25 kg、黑米粉3 kg、全脂淡奶粉3 kg、奶油3 kg、鸡蛋5 kg、白砂糖14 kg、糖浆1 kg、复合稳定剂0.3 kg、香草香精0.3kg、盐适量,用水补充至100kg.     

Effect of slurry ice on chemical changes related to quality loss during European Hake (Merluccius merluccius) chilled storage

Slurry ice is a biphasic system consisting of small spherical ice crystals surrounded by seawater at subzero temperature. Its employment was evaluated in the present work as a new chilled storage method for whole European Hake (Merluccius merluccius) and compared to traditional flake icing. Different chemical analyses (nucleotide degradation, formaldehyde formation, lipid hydrolysis and oxidation, interaction compound formation, and electrophoretic protein profiles) related to quality changes were analysed and compared to sensory evaluation. An inhibitory effect on quality loss mechanisms was observed for the slurry ice treatment, according to nucleotide degradation (K value), free formaldehyde content, browning development, and sarcoplasmic protein profiles. No differences in lipid hydrolysis and oxidation could be distinguished by a comparison between both icing conditions. The sensory analysis showed a higher shelf-life time for slurry icing than flake icing (12 days and 5 days, respectively). Results confirm the practical advantages of using slurry ice as a chilled storage method.     

大豆乳清细菌纤维素在冰淇淋中的应用

研究使用AcetobacterxylinumC5菌种 ,利用大豆乳清发酵得到的细菌纤维素作为稳定剂 ,应用到冰淇淋的加工当中。试验证明 ,细菌纤维素可以替代黄原胶、卡拉胶等稳定剂添加到冰淇淋中 ,它能够改善口感 ,同时呈现爽口的香甜味。细菌纤维素冰淇淋的抗融性和融化特性都比较理想 ,融化率 2 1 7%,膨胀率 67%。同时产品具有一定的膳食保健功能     

八宝酒味雪糕的研制

采用糯米酒新工艺的生产方法,以小曲、糖化酶、活性干酵母作为糖化发酵剂,生产出来醇甜清香、略带酸味的优质糯米酒,然后再把莲子、葡萄干、花生仁、核桃仁、红豆、枸杞子、黑芝麻等小料经加工和糯米共同酿造成八宝糯米酒。八宝酒味雪糕是以八宝糯米酒为主要原料之一,按照雪糕的制作工艺制得营养价值高、口味好的一种冷饮食品。