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感官分析目前在国内研究不多，外文资料很多，特献上 感官分析手册及GB [ Last edited by 幻影无痕 on 2007-7-20 at 07:53 ] |
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德国：一项新的测试系统更方便识别饮料病原体 -------------------------------------------------------------------------------- 2007年4月29日 阅读次数: 52 新闻作者:admin 默认字体 9pt 10pt 11pt 12pt 13pt 14pt 15pt 16pt 17pt 18pt 20pt 25pt 德国德乐集团一直从事浓缩果汁、水果制品、色素、乳品及饮料等行业。从2003年至2006年，作为饮料生产变化评估手段，有过约100次微生物检查过程。最近德乐集团设计的两项新的测试系统，旨在检测出饮料灌装生产过程中混入的病原体和杂质。 此前德乐集团已经设计出针对酒精饮料的测试系统，最新设计出的这两项新系统是针对非酒精饮料。一个是无菌测定系统（AVM），另一种是风险管理系统。 迫于市场规范性的不断提高和人们对食品安全问题关注度的日益升温，食品饮料生产商越来越注重微生物检测的重要性，并将它作为车间生产管理的重要因素。 无菌测定系统的整个检测过程可跟踪饮料从原材料到成品制成的全部生产过程，德乐集团表示，目前在非酒精饮料市场中，消费者对包装的多样化、产品质量的要求越来越高，产品安全的重要性日益凸显。AVM产品生产过程可以让工人在无菌灌装生产过程中确定饮料杂质参数。检测过程使用可视化检测，不需要额外的技术设备，5至7天内可得出检测结果。 德乐集团称，通过提前确定产品加工过程的系统参数，标准测试系统可帮助加工商在生产过程中节省成本。风险管理系统可在饮料生产线中提供品质保证。 德乐集团表示它已研制并生产一批产品，生产者能够接触这些产品检测出饮料的潜在危害。（本文编译： 第一食品网也非） 资料来源：第一食品网 |
24楼2007-05-26 21:52:25
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www.foodnetbase.com最新出版的外文书目 Modern Food Microbiology (6th Edition) 现代食品微生物学 http://bbs.foodmate.net/viewthread.php?tid=9645&fromuid=10459 Essentials of Food Sanitation 食品消毒学 http://bbs.foodmate.net/viewthread.php?tid=5324&fromuid=10459 Foodborne Pathogens-Hazards Risk Analysis and Control 食品中的致病菌：危害、风险分析和控制 http://bbs.foodmate.net/viewthread.php?tid=9760&fromuid=10459 Microbiological Risk Assessment in Food Processing http://bbs.foodmate.net/viewthread.php?tid=9642&fromuid=10459 实验室生物安全手册 http://bbs.foodmate.net/viewthread.php?tid=9985&fromuid=10459 微生物自学教材－Microbiology Demystified http://bbs.foodmate.net/viewthread.php?tid=9741&fromuid=10459 Laboratory Exercises in Microbiology 图文并茂－微生物实验练习 http://bbs.foodmate.net/viewthread.php?tid=9720&fromuid=10459 |
2楼2007-01-14 00:35:34
3楼2007-01-24 15:25:39
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(R) The Flavour Profile Method (Arthur D. Little) This method was developed by Arthur. D. Little in the late 1940’s early 1950’s. It uses a panel of 4-6 trained panellists. Panellists are selected by screening for sensory acuity, interests, attitude and availability. A vocabulary is developed by exposure to a wide range of products from the product category to be assessed. The list is then reviewed and refined and reference standards and definitions applied to each term. The panellists examine the products and the results are reported to the panel leader. Through discussion in an open session lead by the panel leader, a consensus decision is reached for each sample. Aroma, flavour and amplitude, which is the balance or blending of the flavour, is assessed in this way. The scales used with this technique involve the use of numbers and symbols and therefore cannot be analysed statistically. This method is therefore a qualitative descriptive test. The main disadvantage with this type of test is that a dominant panel member or the panel leader could easily influence the panels decision. (R) Profile Attribute Analysis The Flavour Profile method was renamed the Profile Attribute Analysis with the introduction of numerical scales. Mean scores could then be calculated and the data statistically analysed. However consensus methods are still employed by some people. Again, this runs the risk of a result being skewed by a dominant personality in the group. (R) The Texture Profile Method This method was developed at General Foods in the 1960’s. It was based on the principles of the Flavour Profile method to assess the textural characteristics of a product. Textural characteristics are categorised into three groups, mechanical, geometrical and ‘other’ characteristics. 1. Mechanical: relating to the reaction of food to stress eg. hardness, chewiness and adhesiveness 2. Geometrical characteristics: relating to the size, shape and orientation of the particles within the food eg. grainy, fibrous and aerated 3. Other characteristics: relating to the perception of the moisture and fat contents of the food The order in which the characteristics are assessed is also very important. The order of assessment is first bite, “chewing” or masticatory second phase and residual or third phase. Panellists are selected on their ability to discriminate between textural differences in the product area to be trained. Six to ten panellists are suggested. Standardised terminology and rating scales are used for the assessments and each scale point is anchored with a specific food. Initially the technique used an expanded version of the Flavour Profile scale, however more recently category and line scales have been used. Panellists each make their own individual judgement and then depending on the type of scale used, a consensus decision is reached or statistical analysis is performed on the data. (R) Quantitative Descriptive Analysis (QDA ) This method of descriptive analysis was developed in the 1970’s. Ten to twelve panellists are selected by screening for ability to discriminate between products, their ability to verbalise their perceptions and to work as a group. The first step is to expose the panellists to a wide range of products from the product category to be assessed. Each panellist individually lists as many descriptive words possible that describe differences between the products. Hedonic terms such as nice, good, bad, etc are not allowed. Through a group discussion, the list of descriptive words is narrowed down to remove duplications and redundant terms until a standardised vocabulary is reached. This standardised vocabulary then needs to be defined with verbal definitions or reference standards and anchor points for the scale agreed upon. The panel also decides the order in which the terms are to be assessed. During this process the panel leader only acts to facilitate the discussion and provide references but does not influence or lead the panel. Trial evaluations are then carried out using the agreed vocabulary and refinements may be made until the panel is happy with the terms used. The panel leader evaluates the results from these trial sessions and once confident the results are reliable andrepeatable the actual assessment can take place. The assessment and trial sessions are completed in sensory booths following the basic principles of sensory evaluation. An unstructured 6-inch or 15cm line scale is used to measure the intensities of the agreed characteristics. Several replicates (3+) are required to validate the data. Data is then analysed using an analysis of variance. The results are often displayed visually on a spider web or star diagram. Other Methods Other methods which you may come across in literature but which will not be discussed in detail in this workshop are: Spectrum Method This is a descriptive analysis technique developed by Civille to cover any or all of appearance, aroma, flavour, texture or sound characteristics. Panellists use a standardised lexicon of terms to evaluate the products. This method requires extensive training of the panel to use standardised scales anchored with multiple reference points and panellists are trained to use the scale identically. Data is analysed in a similar way to QDA. Time Intensity This is used to track the changes in perception of a particular attribute of a product over time. For example you might rate the intensity of mint flavour perceived in chewing gum over a 3 minute period. This can be measured using pencil and paper or using one of the sensory software packages with time intensity facilities. Free Choice Profiling Unlike other descriptive testing techniques this method does not use an agreed vocabulary to assess the samples. Each panellist generates their own list of terms and scales, although they must use these consistently for all samples. The data from this type of assessment is then analysed using Generalised Procrustes analysis. The main advantage of this technique is the time saved on training a panel, however interpretation of individual attributes can be subjective as the terms are not defined as with other descriptive testing methods. |
4楼2007-02-01 13:10:09