脉冲磁场对大肠杆菌和金黄色葡萄球菌杀灭效果的验研究

通过试验,考察了脉冲磁场对于大肠杆菌和金黄色葡萄球菌杀灭效果的影响.试验结果表明,脉冲数(杀菌时间)和磁场强度对两株菌的杀菌效果影响显著,脉冲数增至20以后,杀菌效果趋于稳定;脉冲数对杀菌效果的影响大于磁场强度.     

自动控制脉冲强光杀菌装置的研制

采用单片机控制技术，研制了自动控制脉冲强度杀菌装置。每个光脉冲的输入能量可达６００～２２００Ｊ；光脉冲宽度经测定小于８００μＳ。３０个光脉冲能使大肠杆菌减少５个数量级，４０个光脉冲以使蛋白酶的活力钝化９０％，脉冲强光杀菌可事负透明塑料薄膜包装的切片面包的保存期延长１倍以上，脉冲强光杀菌是一种很有发展前途的冷杀菌技术。     

响应面优化脉冲强光对煎饼表面大肠杆菌的杀菌效果

采用脉冲强光对煎饼表面进行杀菌处理,研究脉冲强光对煎饼表面大肠杆菌的杀菌效果。在单因素试验基础上,利用响应面分析方法建立大肠杆菌数量降低对数值的二次多项数学模型,利用模型对脉冲能量、脉冲次数和脉冲距离及其交互作用进行分析。结果表明：脉冲强光可有效杀死煎饼表面的大肠杆菌,优化条件为脉冲能量500 J、次数40 次、距离10.9 cm,此时脉冲强光对煎饼表面大肠杆菌的数量可减少2.15 个对数值,提高了煎饼的货架期及食用安全性。     

脉冲强光杀菌装置设计的初步研究

脉冲强光杀菌是一种新兴的冷杀菌技术，本试验设计脉冲强光杀菌的发生电路，对电路进行了初步的设计研究，使用双电源脉冲发生电路提供能量，使电路简单化，并达到预期效果。     

脉冲磁场对大肠杆菌和金黄色葡萄球菌杀灭效果的试验研究

通过试验,考察了脉冲磁场对于大肠杆菌和金黄色葡萄球菌杀灭效果的影响。试验结果表明,脉冲数(杀菌时间)和磁场强度对两株菌的杀菌效果影响显著,脉冲数增至20以后,杀菌效果趋于稳定;脉冲数对杀菌效果的影响大于磁场强度。      

脉冲磁场对大肠杆菌和金黄色葡萄球菌杀灭效果的试验研究

通过试验,考察了脉冲磁场对于大肠杆菌和金黄色葡萄球菌杀灭效果的影响。试验结果表明,脉冲数(杀菌时间)和磁场强度对两株菌的杀菌效果影响显著,脉冲数增至20以后,杀菌效果趋于稳定;脉冲数对杀菌效果的影响大于磁场强度。     

脉冲强光对煎饼中细菌的杀菌效果的研究

煎饼在包装和贮藏过程中易受微生物的二次污染,严重影响其食用安全性,采用脉冲强光杀菌技术可有效杀死煎饼中的微生物。结果表明:脉冲能量为400J、次数20次、距离10.9cm、频次2次/s,在此优化条件下脉冲强光对煎饼中细菌杀菌率达到99.4%。      

脉冲强光对煎饼中细菌的杀菌效果的研究

煎饼在包装和贮藏过程中易受微生物的二次污染,严重影响其食用安全性,采用脉冲强光杀菌技术可有效杀死煎饼中的微生物。结果表明:脉冲能量为400J、次数20次、距离10.9cm、频次2次/s,在此优化条件下脉冲强光对煎饼中细菌杀菌率达到99.4%。     

脉冲强光杀菌在水处理中的应用

介绍了饮用水生产中的杀菌方法及存在的主要问题,介绍了脉冲强光杀菌原理,并展望了该方法在水处理的广阔应用前景。     

脉冲强光杀菌装置的初步设计研究

脉冲强光杀菌是一种新兴的冷杀菌技术,本文设计脉冲强光杀菌的发生电路,对其进行了初步的设计研究,使用双电源脉冲发生电路提供能量。     

Inactivation of Staphylococcus aureus in milk using flow-through pulsed UV-light treatment system

ABSTRACT:  This study investigated the efficacy of pulsed UV-light for continuous-flow milk treatment for the inactivation of Staphylococcus aureus , a pathogenic microorganism frequently associated with milk safety concerns. Pulsed UV light is an emerging technology, which can be used for the inactivation of this pathogen in milk in a relatively short time. Pulsed UV light damages the DNA of the bacteria by forming thymine dimers that lead to bacterial death. The effect of sample distance from the quartz window of the UV-light source, number of passes, and flow rate was investigated. A response surface methodology was used for the design and analysis of experiments. Milk was treated at 5-, 8-, or 11-cm distance from a UV-light strobe at 20, 30, or 40 mL/min flow rate and treated up to 3 times by recirculation of milk to assess the effect of the number of passes on inactivation efficiency. Log₁₀ reductions varied from 0.55- to 7.26-log₁₀ CFU/mL. Complete inactivation was obtained in 2 cases and no growth was observed following an enrichment protocol. Predicted results were in agreement with the experimental data. Overall, this work demonstrates that pulsed UV-light has a potential for inactivation of milk pathogens.     

HACCP在冷冻馒头生产中的应用

介绍了将HACCP应用于冷冻馒头生成中,通过控制原辅料检验、面团发酵、冷却与包装、冷冻与冻藏,实现预防和降低生产中的各种危害的方法.     

馒头萎缩的研究进展

馒头萎缩是影响馒头品质的关键问题之一。虽然可以通过调节加工工艺、配料和小麦粉品质解决馒头萎缩,但具体的馒头萎缩机制目前尚不是太清楚。针对前人关于馒头萎缩的研究,进行总结和综述,并对馒头萎缩研究进行了展望。     

Predicting heat inactivation of Staphylococcus aureus under nonisothermal treatments at different pH

The aim was to assess whether heat resistance data obtained from isothermal treatments allow the estimation of survivors of Staphylococcus aureus under nonisothermal conditions and to find a model that accurately predicts its heat inactivation at constantly rising heating rates (0.5-9 degrees C/min) in media of different pH (4.0-7.4). S. aureus showed a higher heat resistance under isothermal treatments at pH 4.0 than at pH 5.5-7.4. However, under nonisothermal treatments S. aureus increased its heat resistance at pH 5.5-7.4 and became more thermotolerant than at pH 4.0. Estimations of survival curves under nonisothermal treatments obtained from heat resistance parameters of isothermal treatments did not adequately fit experimental values. Whereas the number of survivors was much higher than estimated at pH 5.5-7.4, that obtained at the slower heating rates at pH 4.0 was lower. An equation based on the Weibullian-like distribution (log10 S(t) = (t/delta)p) accurately described survival curves obtained under nonisothermal conditions. A nonlinear relationship was observed among the scale parameter (delta) and the heating rate which allowed the development of two equations capable of predicting the inactivation rate of S. aureus under nonisothermal treatments. This study might contribute to prevent public health risks in foods requiring long heating lag phases during their processing.     

高粱馒头工艺与品质研究

研究了高粱馒头的工艺及品质,并通过正交试验对工艺进行了优化。结果为：高粱粉添加量2096、加水量53％、发酵时间2．5h、醒发时间20min时,可以得到品质良好的高粱馒头。     

南瓜馒头的研制

论述了南瓜的营养价值和保健功能、低聚木糖的独特生理功能。通过正交试验确定了保健型南瓜馒头的最优工艺：南瓜粉添加量为30％,加水量为48％,发酵时间3h,低聚木糖量1．3％,醒发时间为25min。     

木聚糖酶在提高馒头品质中的应用

介绍了食品级木聚糖酶在提高馒头品质中的应用。对比了1种国产食品级木聚糖酶与2种进口食品级木聚糖酶作用的效果,证明国产木聚糖酶用于主食馒头加工具有独特的优势,可以替代国外同类进口产品。     

小麦胚芽粉对馒头品质的影响

研究了小麦胚芽粉加入量对馒头品质的影响。测定不同小麦胚芽粉加入量下制得的馒头的比容、白度、硬度以及感官评分等并观察其变化,结果显示,随着小麦胚芽粉含量的增加,馒头的白度和比容均呈下降趋势,而硬度呈现先平缓后上升的趋势,馒头的感官评分则是先增大后减小,在加入量为6%时所制得的馒头的感官评分最高。     

黄原胶对馒头质构影响的研究

研究不同添加量的黄原胶对馒头质构的影响,采用TPA(Texture ProfileAnalysis)技术,研究黄原胶对馒头的硬度(Hardness)、弹性(Springiness)、粘着性(Adhesiveness)、内聚性(Cohesiveness)、咀嚼性(Chewingness)、回复性(Resilience)的影响。结果表明,馒头制作中添加一定量的黄原胶能够改善馒头的质构,提高馒头的品质。结果发现,黄原胶三个水平的添加量中0.10%的黄原胶改善馒头质构的效果最好。     

小米馒头工艺与品质研究

通过对小米馒头的工艺与品质进行研究,可知随着小米粉添加量的增加,加水量逐渐降低,发酵体积逐渐减小,通过正交实验可以得出在小米粉添加量为45%、加水量为45%、发酵时间为3h、醒发时间为40min时,可以得到品质良好的小米面馒头。