共查询到19条相似文献,搜索用时 171 毫秒
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葡萄酒、果酒酒精含量测定中计算方法的探讨 总被引:1,自引:0,他引:1
葡萄酒、果酒国际GB/T15038-94中规定:测定酒精含量的方法有气相色谱法、密度瓶法和酒精计法,其中气相色谱法测定速度最快、结果最准确,但一般葡萄 相似文献
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啤酒酒精度分析中重量法与容量法的差异 总被引:1,自引:0,他引:1
《啤酒》国家标准 GB4927—2001及《啤酒分析方法》GB4928—2001已于2003年1月1日正式实施。其中酒精度分析法分为第一法“密度瓶法”(又分容量法和重量法);第二法气相色谱法;第三法仪器法。我们对密度瓶法的容量法与重量法进行了对比实验,发现两分析方法的结果存在差异。1 分析原理一定量的啤酒样品经蒸馏得到的乙醇溶液在 相似文献
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本文主要探讨抽其密闭油样瓶上部气体,用气相色谱法测定食用植物油中溶剂残留的方法.实验结果表明,液上气法对仪器无污染,峰形好、出峰快,操作简便,并与直接油样法进行了比较实验,对同一油样,测定结果很接近.本法回收、准确度和 相似文献
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气相色谱法分析共轭亚油酸异构体 总被引:17,自引:0,他引:17
有许多种测定共轭亚油酸各异构体相对含量的方法 ,如气相色谱法、银离子高效液相色谱法、气质联用和核磁共振法等 ,其中气相色谱法最为简便快速。本研究选择气相色谱法用于共轭亚油酸各异构体的分析。结果表明 ,气相色谱法可用于共轭亚油酸中主要异构体的相对含量的测定 相似文献
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气相色谱法可实现对白酒生产的主产物、副产物以及酒中微量芳香成分的测定.在白酒样品应用气相色谱法分析时一般采用直接进样法,色谱柱可选择填充柱和毛细管柱,检测器选用FID,柱温宜采用程序升温方式进行.(孙悟) 相似文献
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根据GB/T 15038-2006《葡萄酒、果酒通用分析方法》[1]中的密度瓶法作为对象,建立密度瓶法测定葡萄酒中酒精度的不确定度分析方法,以评定测定结果的质量,找出主要影响因素。分析测试过程中产生的不确定度分量来源,并利用测定结果及其他资料,按照JJF1059-1999《测量不确定度评定与表示》[2]评定该测试结果的不确定度。 相似文献
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Refillable polyester bottles, for example polyethylene terephthalate (PET) bottles, are known to interact with chemicals. Aroma compounds from a product can be absorbed by the bottle material, remain after washing and remigrate when the bottle is reused, resulting in off-flavour of the new product. A certified reference material has recently been approved with which the chemical and sensory inertness of refillable bottle materials can be tested. In this study a sensory method aimed at characterizing the sensory inertness properties of the reference bottle material was developed. A use-reuse situation was simulated by storing bottle wall strips in a solution of four odour-active compounds (the loading phase) and, after cleaning, immersing them in water (the remigration phase). The remigration water was analysed with both a sensory method, i.e. determination of the threshold odour number, and chemically using gas chromatography-mass spectrometry (GC-MS). Additionally, another PET and a polyethylene naphthalate (PEN) bottle material were also tested. The sensory threshold determination method could differentiate between the PEN materials and the PET materials. Results from chemical analysis showed that the inertness properties of the PET materials were very similar. The PEN material exhibited significantly superior inertness properties, with only 3-24% of the aroma transfer properties of PET. 相似文献
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Carbon dioxide formation in non-fat dry milk during accelerated non-enzymic browning reaction was determined by gas chromatography. Carbon dioxide content in the headspace of the sample bottle increased as the non-enzymic browning reaction increased. Non-fat dry milk containing added 0, 15 or 30 g kg?1 lysine in the air-tight serum bottle was stored at 55, 65 or 75°C. The coefficients of variation for reflective spectroscopic brown colour measurement and GC carbon dioxide determination were 1.37% and 1.30%, respectively. The average correlation coefficient between brown colour development and carbon dioxide formation for the nine samples during storage was 0.96. The simple, fast and reproducible gas chromatographic carbon dioxide determination method could be used to study non-enzymic browning reactions in foods or to complement other analytical methods in measuring the non-enzymic browning reaction. 相似文献
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A 3D Computational Fluid Dynamics (CFD) approach is used to investigate the effect of parameters such as bottle geometry, surface tension, or inclination on bottle emptying processes. The method can e.g. be used to assess changes of bottle emptying times induced by new bottle shapes, and it is shown to be much more accurate than existing empirical models. While expensive commercial CFD software has substantially restricted and hindered the use of this method in the past, our approach is based on freely available open source CFD software and hence accessible to everyone. 相似文献
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电子鼻检测玉米象不同虫态的技术研究 总被引:1,自引:0,他引:1
针对粮堆中储粮害虫玉米象检测技术落后,检测结果不可靠等问题,利用电子鼻对玉米象不同虫态及虫态组合进行检测,并采用主成分分析法(PCA)和判别因子分析法(DFA)对检测数据进行分析,结果表明:电子鼻可以对不同密度的玉米象成虫进行有效的识别,但当虫口密度高于20头/瓶时,无法进行区分;使用电子鼻检测玉米象不同虫态时,PCA分析法的重复间数据较分散,区分度不高,而DFA分析法可将各虫态有效区分;电子鼻检测玉米象混合虫态时,DFA分析法可将不同组合有效区分,而PCA分析法无法区分,因此将电子鼻检测结合DFA分析法用于玉米象不同虫态及虫态组合的检测是可行的。 相似文献
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易拉瓶盖作为一种新型的啤酒包装材料,已在本公司成功应用并逐渐在浙江、吉林等地的啤酒厂推广,取得了良好效果。简要介绍普通玻璃瓶装啤酒采用易拉瓶盖封口的设备改造方法和保证密封性能的若干措施。 相似文献