共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
5.
《中华纸业》2015,(24)
为了研究国产和进口造纸法再造烟叶的无机添加物的成分和含量差异,采用X射线光电子能谱(X P S)对再造烟叶表面的元素组成进行分析,以获得填料和助燃剂等物质成分的信息,结果显示,所检测的国产和进口再造烟叶的填料主要是碳酸钙,助燃剂成分均为钾盐。然后分别采用化学分析方法和原子吸收光谱法准确分析再造烟叶中的总碳酸钙和水溶性钾,几种国产再造烟叶的总碳酸钙含量为3.48%~5.5%,显著低于进口产品的6.08%;而国产再造烟叶钾含量为1.71%~2.49%,进口产品钾含量为2.02%,低于大部分国产再造烟叶。采用显微镜观察分析了再造烟叶的纤维组织和分散纤维的形态。在进口样品中,宽度小于50μm、长度大于2mm的细长纤维的比例高于国产样品,宽度为200~500μm粗纤维也更为通透,说明纤维解离较好。再造烟叶中的碳酸钙含量高有助于改善片基物理性能,而解离完全的纤维更易于燃烧,使燃烧性能的改善不仅仅依赖于助燃剂的添加量。。 相似文献
6.
7.
再造烟叶产品的涂布率是再造烟叶生产过程中一个非常重要的质量稳定性指标。为掌控再造烟叶产品在线生产过程中涂布率检测结果的及时反馈,以及行业快速检测方法统一的需要,本文在经典方法 YC/T 572-2018的基础上,通过对不同温度、不同烘干时间等影响检测结果因素的比对分析,开发出一种快速大批量测定热水可溶物含量的检测方法——平板干燥法,涂布率实验数据通过相关数理统计分析。结果表明:平板干燥法适合于在线生产的快速检测,对在线生产产品质量情况的快速控制提供了一种更有效的分析方法。 相似文献
8.
9.
10.
为明析不同档次再造烟叶的质量特性,对国内14个不同档次的再造烟叶样品进行纤维形态、常规物理指标、常规化学指标、挥发性致香成分和内在感官质量进行分析。结果表明:(1)随着再造烟叶档次的提升,对削弱再造烟叶抗张强度、撕裂强度等物理性质的扭结纤维比例均值升高,对提高纤维留着、浆料滤水性能的细小纤维占比均值降低。(2)中高档再造烟叶热水可溶物含量低于低档造纸法再造烟叶产品1%,低中档造纸法再造烟叶灰分含量均值高于高档再造烟叶产品1%。(3)总糖、还原糖含量均值随再造烟叶档次的提升而逐渐提升,低档再造烟叶总植物碱含量稍高于中高档再造烟叶为1.26%。(4)随着再造烟叶档次的提升,对烟香贡献较大的酮类、醛类、酯类挥发性致香成分含量均值下降,再造烟叶内在感官质量,香气量、香气质、舒适性和浓度提升,木质杂气和刺激性降低。 相似文献
12.
13.
F S Interesse G D'Avella V Alloggio F Lamparelli 《Zeitschrift für Lebensmittel-Untersuchung und -Forschung》1985,181(6):470-474
Following our study of the mineral contents of some Southern Italian wines, this work reports on the detection of 12 elemental components. The elements were determined using ICP-AES, flame atomic emission or absorption spectroscopy. The values determined for Li, Na, Mg, K, Ca, Rb, Sr and Ba were within the usual ranges for wines (average values for these elements were: 0.010, 26.2; 94.4; 888; 94.0; 3.30, 0.82 and 0.11 mg/l respectively). All the wines contained low levels of As, the concentrations of which were always under 0.20 mg/l, the maximum level permitted by E.E.C. standards. The measuring of Co, Ag, and Sb led us to ascertain, in all the wines, concentrations lower than 0.01 mg/l for Co and Ag and below the instrumental detection level for Sb (0.06 mg/l). In a previous study wines from D.O.C. areas of Southern Italy were analysed by the technique of inductively coupled plasma atomic emission spectroscopy (ICP-AES), for 14 minerals. This paper deals with further investigation of the mineral composition of the same wines for different metal constituents, analysed by ICP-AES, flame atomic emission, or atomic-absorption spectroscopy (two techniques). The first technique was applied to the detection of Co, As, Sr, Ag, Sb, and Ba. The alkaline metals Li, Na, K, and Rb were determined by flame atomic emission, a technique which possesses better detection limits for these elements. For Mg and Ca the atomic absorption methods were applied. 相似文献
14.
采用微波消解-电感耦合等离子体质谱法测定了41个牌号烤烟型卷烟和雪茄烟样品烟丝中的锂、铬、镍、铜、砷、硒、钼、镉、铊和铅含量,并按照类型和价位对卷烟中这10种有害元素含量进行了统计分析。结果发现:①卷烟中锂和铜的含量较高,铊的含量很低,铬、镍、镉、铅、砷、硒和钼7种元素的平均含量为0.55~4.42μg/g;②雪茄烟中铬、镍、砷、钼、镉、铊和铅的含量一般高于烤烟型卷烟,而硒元素的含量则相反,但差别较小;烤烟型卷烟中锂和铜的含量与雪茄烟没有显著差异;③高档卷烟中的锂、镍、镉、铊和铬含量较低,而砷、铅的含量较高;不同价位卷烟的铜、硒和钼含量差异不显著。 相似文献
15.
1997 UK Total Diet Study dietary exposures to aluminium, arsenic, cadmium, chromium, copper, lead, mercury, nickel, selenium, tin and zinc 总被引:4,自引:0,他引:4
Gillian Ysart Patrick Miller Michelle Croasdale Helen Crews Paul Robb Malcolm Baxter Christian De L'Argy Nigel Harrison 《Food Additives & Contaminants》2000,17(9):775-786
Concentrations of aluminium, arsenic, cadmium, chromium, copper, lead, mercury, nickel, selenium, tin and zinc were determined in samples from the 1997 UK Total Diet Study and used to estimate dietary exposures of the general UK population. Population average dietary exposures to aluminium (3.4mg/day), arsenic (0.065mg/day), cadmium (0.012mg/day), chromium (0.10mg/day), copper (1.2mg/day), mercury (0.003mg/day), nickel (0.13mg/day), tin (1.8mg/ day) and zinc (8.4mg/day) are similar to those from previous UK Total Diet Studies and are below the appropriate PTWIs, PMTDIs and TDIs. Dietary exposure of the UK population (0.026 mg/day) to lead is falling as a result of measures taken to reduce lead contamination of the environment and food and is well below the PTWI. There has been little change in UK estimates of selenium exposure since the 1994 Total Diet Study but current estimates (0.039mg/day) are lower than those derived from earlier Total Diet Studies. 相似文献
16.
采用高压结合酶法处理凡纳滨对虾的虾蛋白、虾仁泥(虾肉)和虾仁,获得3 种低敏虾制品;采用酶联免疫吸附法检测3 种虾制品的过敏原性,采用全身性过敏反应(过敏性休克模型)及致敏离体回肠平滑肌收缩实验(Schultz-Dale反应)检测3 种低敏虾制品的致敏性,以分析体内与体外方法检测虾制品致敏性的差异性。结果显示:处理前的3 种原料过敏原性极高。经高压结合酶法处理的虾蛋白、虾肉和虾仁的过敏原性分别消减97.0%、94.1%和94.5%。而在动物实验中(以磷酸缓冲盐溶液为阴性对照,未处理虾蛋白为阳性对照,以豚鼠为受试对象),未处理虾蛋白组的过敏反应发生率与死亡率均为100%,3 种低敏虾制品的过敏反应发生率也为100%,死亡率分别为16.7%(虾蛋白产物)、50%(虾肉产物)和83.3%(虾仁产物)。致敏的离体回肠受到3 种低敏虾制品攻击后,收缩力也明显增强,分别达到376.9%、766.2%和1 004.4%。上述结果表明,对高压结合酶法制备的低敏虾制品过敏原性的检测,体外检测与体内检测存在一定的差异性。 相似文献
17.
H. Henschel 《Molecular nutrition & food research》1979,23(2):192-192
18.
利用动态顶空制样-热脱附-气相色谱-嗅闻-质谱联用技术,结合气味活度值(odor activity value,OAV)以及感官评价,对不同贮藏时间(0、7、14、21、35、49、77 d)的风干肠挥发性风味物质进行检测,分析贮藏过程中各类挥发性物质变化情况,并对造成异味的主要物质进行鉴别。结果表明:不同贮藏时间的样品中,分别检出挥发性风味物质59、56、63、58、73、68、71 种,主要为酯类物质;随着贮藏时间的延长,风干肠样品色泽变黑,失去光泽,异味逐渐增加,可接受度降低,其中有21、21、17 种风味活性物质分别与感官评价中色泽、风味、可接受度评分显著相关;经过OAV分析以及气相色谱-嗅闻鉴定,辛酸乙酯、1-辛烯-3-醇、正己醛、庚醛、正辛醛、壬醛、反,反-2,4-癸二烯醛可能是造成风干肠异味的主要物质。 相似文献
19.