羊毛与黏胶混纺面料定量分析方法比较

分别使用0.5 mol/L次氯酸钠法、36%～38%浓盐酸法对标准羊毛贴衬、黏胶贴衬及多种配比的两者混和试样、深色针织面料、浅色针织面料和深色机织面料以及已知混纺比的毛黏混纺面料进行试验,分析在一定含量范围内可优先选择的试验方法。结果表明,当羊毛含量低于20%时,建议采用36%～38%浓盐酸法;当羊毛含量高于20%且低于50%时,36%～38%浓盐酸法及0.5 mol/L次氯酸钠法都可采用;当羊毛含量高于50%时,建议采用0.5 mol/L次氯酸钠法。     

羊毛与桑蚕丝混纺织物定量分析方法的研究

介绍了3种关于羊毛与桑蚕丝混纺织物定量分析的方法,即75%硫酸法、浓盐酸法、甲酸-氯化锌法,并指出了75%硫酸法对羊毛损伤较大的问题。文中探讨了浓盐酸法、甲酸-氯化锌法的羊毛纤维质量修正系数,并采用75%硫酸法、浓盐酸法、甲酸-氯化锌法测试了羊毛与桑蚕丝混纺针织面料及梭织面料中羊毛的含量。结果表明:浓盐酸法、甲酸-氯化锌法对羊毛纤维质量损失影响较小;对于羊毛与桑蚕丝混纺针织及梭织面料,浓盐酸法及甲酸-氯化锌法测得羊毛含量与面料实际配比比较接近,而硫酸法测得羊毛含量与真实配比相差较远,且羊毛损伤较大,可以采用浓盐酸法或甲酸-氯化锌法代替75%硫酸法。     

羊毛/桑蚕丝溶解方法的探讨

采用75%硫酸法、氯化钙/乙醇法、硝酸钙法和甲酸/氯化锌法对羊毛/桑蚕丝混纺产品进行了定量分析,并探讨了4种方法不同的试验条件和试验结果.试验结果表明:氯化钙乙醇法、硝酸钙法和甲酸/氯化锌法的实测含量与实际含量较接近,重现性较好.     

丝／毛混纺面料定量分析方法的比较

现行标准中涉及的丝／毛定量分析方法有5种，为了从中选出较为合理的方法，选用不同风格的丝／毛面料，用手拆法、甲酸氯化锌法、59．5％硫酸法、75％硫酸（室温）法和75％硫酸（40℃）法进行定量分析。试验结果表明，59．5％硫酸法、甲酸氯化锌方法和手拆法的测试结果差异在1％以内；75％硫酸法在40℃条件下，羊毛的测试值比前三种方法的差异偏大，在2％以内；75％硫酸法在25C条件下的测试结果与其他方法的偏差较大，有些达到3％以上。该研究表明，在进行丝／毛面料定量分析时要选择合适的方法。     

桑蚕丝/羊毛纤维混纺织物定量化学分析方法的探讨

文章采用硫酸法和甲酸/氯化锌法,对五种不同配比的桑蚕丝/羊毛纤维混纺织物进行试验,探讨在定量化学分析中可以优先选择的试验方法。试验是利用桑蚕丝和羊毛在试剂中的溶解性差异,溶解去除混纺织物中的桑蚕丝,收集残留物,进行清洗和烘干后,对不溶残留物进行称重,用修正后的质量计算不溶组分羊毛占混纺织物干燥质量的净干质量分数,再由差值得出溶解组分桑蚕丝的净干质量分数。两种试验方法得到的试验结果表明,硫酸法和甲酸/氯化锌法的含量偏差均符合±5%的含量允差范围。在试验过程中,通过研究分析两种试验方法对不同配比混纺织物造成的结果差异,发现硫酸法测得的羊毛含量始终高于配比值。尤其是当羊毛含量高于30%后,差异更为明显。用甲酸/氯化锌法进行试验时,羊毛含量的偏差均小于1%,数据的稳定性和重现性好,结果更为准确。因此,桑蚕丝/羊毛纤维混纺织物在定量化学分析时,应优先使用甲酸/氯化锌法进行试验,这样结果的准确性能得到保证。     

羊毛与桑蚕丝混纺产品定量分析的探讨

目前羊毛、桑蚕丝的混纺产品定量化学分析方法主要采用GB/T2910.18—2009中的75%硫酸法和FZ/T01112—2012中的甲酸氯化锌法,但浓硫酸法和甲酸-氯化锌法配制及使用都有一定的危险性,对环境也有一定的影响。本文介绍了浓盐酸法,将浓盐酸法与GB/T 2910.18—2009中的75%硫酸法、FZ/T01112—2012中的甲酸-氯化锌法方法进行对比,测试羊毛与桑蚕丝不同混纺比例试验结果的稳定性和重现性。结果表明,采用浓盐酸法测试羊毛与桑蚕丝混纺产品具有一定的可行性,浓盐酸法溶解桑蚕丝时对羊毛的损伤较小,试验误差最小,结果重现性最好,且试验时间较短,易操作。     

不同试剂对醋酯纤维/聚酯纤维混纺面料定量分析的探讨

采用甲酸/氯化锌法、N,N-二甲基甲酰胺法、75%硫酸法对醋酯纤维/聚酯纤维混纺面料进行定量分析,并与国家标准GB/T 2910.3—2009的丙酮法作对比,结果表明：75%硫酸法、甲酸/氯化锌法、N,N-二甲基甲酰胺法均能准确定量分析,且75%硫酸法更加健康、经济和安全,建议在检测试验中考虑以上三种方法,优先考虑75%硫酸法。     

桑蚕丝/羊毛混纺产品定量化学分析方法探讨

文章对桑蚕丝/羊毛混纺产品的三种定量化学分析方法进行比对分析。结果表明,40℃甲酸/氯化锌法和70℃甲酸/氯化锌法对浅色产品适用,深色产品不适用,75%硫酸法(40℃)对浅色、深色产品都能适用。     

甲酸/氯化锌法定量分析羊毛/桑蚕丝混纺产品

羊毛／桑蚕丝混合物的定量分析方法有75％硫酸法和甲酸／氯化锌法,本文通过试验对比分析了两种方法的准确性,试验表明,甲酸／氯化锌法对羊毛基本没有损伤,所得结果更接近真值,且用时较短,可在日常检测过程中优先使用。     

羊毛与桑蚕丝混纺产品定量分析方法的分析讨论

针对GB2910.18-2009的硫酸法和FZ/T01112-2012的甲酸/氯化锌法规定的羊毛/桑蚕丝混纺织物定量分析对深色样品存在不完全溶解的问题,本文利用保险粉,对85/15的羊毛/桑蚕丝深色面料先褪色,后进行定量分析,并对两种不同的实验方法进行了比较分析,结论为使用保险粉褪色对样品的损伤可忽略不计,对实验数据不会造成影响;褪色后使用硫酸法和甲酸/氯化锌法实测混纺比例比褪色样品的准确性高;甲酸/氯化锌法比硫酸法的实测值更为接近已知样品的混纺比。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.