锥齿针布在生产细旦纤维中的应用

探讨光山白鲨针布厂家生产的大白鲨锥齿系列针布在生产细旦莫代尔品种上的应用情况。生产实践对比显示,大白鲨锥齿系列针布与graf针布相比,质量指标基本相当,但要好于国内其它品牌针布的成纱质量。大白鲨锥齿针布优化的齿型设计和特殊表面处理工艺,是其能提高梳理质量、减少纤维损伤、提高成纱质量的根本原因。     

芦荟纤维素纤维混纺纱生产实践

芦荟纤维是芦荟在纺织品应用领域的一种尝试,将芦荟纤维与其它纤维混纺可实现性能优势互补。本文通过实践研究确定了一种芦荟纤维混纺纱的最佳纺纱工艺,实现莫代尔/芦荟、麻赛尔/芦荟混纺纱的可纺性。经检测成纱性能优异,达到纱线标准一等品指标要求,具有广阔的应用前景。     

梳棉机针布选配与工艺优化

探讨了梳棉机针布选配和工艺参数的选择问题。通过工艺对比得出,纺C14.6 tex棉纱时针布选配应按照锡林针布稀、盖板针布密的原则进行。在生条定量3.9 g/m、刺辊速度970 r/min、锡林速度403 r/min工艺条件下,有利于进一步提高成纱质量。     

鲨鱼软骨粉综合监测方法探讨

采用气相色谱,氨基酸分析,红外光谱等方法检测鲨鱼软骨制品中有机物与无机物无机组组成,尤其是对糖蛋白和蛋白多糖内中性糖成分,特定氨基酸的检验,可对市场上各种鲨鱼软骨制品质量状况作出比较全面而准确的评价。     

Rapid Quantitative Determination of Squalene in Shark Liver Oils by Raman and IR Spectroscopy

Squalene is sourced predominantly from shark liver oils and to a lesser extent from plants such as olives. It is used for the production of surfactants, dyes, sunscreen, and cosmetics. The economic value of shark liver oil is directly related to the squalene content, which in turn is highly variable and species‐dependent. Presented here is a validated gas chromatography‐mass spectrometry analysis method for the quantitation of squalene in shark liver oils, with an accuracy of 99.0 %, precision of 0.23 % (standard deviation), and linearity of >0.999. The method has been used to measure the squalene concentration of 16 commercial shark liver oils. These reference squalene concentrations were related to infrared (IR) and Raman spectra of the same oils using partial least squares regression. The resultant models were suitable for the rapid quantitation of squalene in shark liver oils, with cross‐validation r² values of >0.98 and root mean square errors of validation of ≤4.3 % w/w. Independent test set validation of these models found mean absolute deviations of the 4.9 and 1.0 % w/w for the IR and Raman models, respectively. Both techniques were more accurate than results obtained by an industrial refractive index analysis method, which is used for rapid, cheap quantitation of squalene in shark liver oils. In particular, the Raman partial least squares regression was suited to quantitative squalene analysis. The intense and highly characteristic Raman bands of squalene made quantitative analysis possible irrespective of the lipid matrix.     

新型大白鲨针布的应用实践

研究了新型大白鲨锡林针布对生条质量的影响问题。用aQura对新型大白鲨针布所加工的生条进行了检测,结果显示新型大白鲨针布所加工的生条与普通针布所加工的生条相比,棉结去除率高2.28%,平均纤维有效长度高0.57 mm,短绒率下降2.5%,大白鲨锡林针布有利于生条质量的改善,原因在于其良好的光洁度、耐磨度和锋利度。     

Discrimination against diacylglycerol ethers in lipase-catalysed ethanolysis of shark liver oil

Lipase-catalysed ethanolysis of squalene-free shark liver oil was investigated. The mentioned shark liver oil was comprised mainly of diacylglycerol ether and triacylglycerols. In order to test discrimination against diacylglycerol ether, up to 10 different lipases were compared. The ratio of oil to ethanol and lipase stability were also evaluated. Surprisingly, lipase from Pseudomonas stutzeri was the fastest biocatalyst among all assayed, although poor discrimination against diacylglycerol ether was observed. The best results in terms of selectivity and stability were obtained with immobilised lipase from Candida antarctica (Novozym 435). Ethanolysis reaction after 24 h in the presence of Novozym 435 produced total disappearance of triacylglycerol and a final reaction mixture comprised mainly of diacylglycerol ethers (10.6%), monoacylglycerol ethers (32.9%) and fatty acid ethyl esters (46.0%). In addition, when an excess of ethanol was used, diacylglycerol ethers completely disappeared after 15 h, giving a final product mainly composed of monoacylglycerol ethers (36.6%) and fatty acid ethyl esters (46.4%).     

Effective Diffusivity Determination Considering Shrinkage by Means of Explicit Finite Difference Method

Drying data of salted shark (Carcharhinus limbatus) muscle pieces samples, dried in a convective dryer, by using three different air conditions and two different air velocities, were treated by Fick's second law. The shrinkage during drying process was considered as a linear function of sample moisture. The Fick's second law equation was numerically solved by the explicit finite difference method to obtain effective diffusivity, considering shrinkage and with and without simplification of moisture content profile. The experimental data fitted very well independently of the simplification introduced on the moisture content profile. The best fit was obtained by considering volumetric average of sample moisture content. The effective diffusivity values calculated considering the shrinkage varied from 0.72 to 2.20 × 10^?10 m²/s with the mean relative deviation modulus from 1.02 to 6.51%. The activation energy expressed in function of air temperature varied from 3.42 to 19.23 kJ/mol.     

Evaluation of chondroitin sulfate in shark cartilage powder as a dietary supplement: Raw materials and finished products

We evaluated the content and biochemical properties of chondroitin sulfate (CS) in shark cartilage powders being used as nutraceutical supplements. The quantities of CS in shark cartilage products (SCPs) and finished products containing shark cartilage powder were determined by analyzing unsaturated disaccharides after treatment with chondroitinase ABC, and the results were compared with the specifications on the product labels. This method was validated and good linearity (r ? 0.999) was obtained. The recovery ranged from 95.27% to 102.39% with precision from 2.27% to 3.95%. Furthermore, the average molecular weights (MW) and the origins of CS in SCPs and finished products were evaluated by agarose gel-electrophoresis and assessment of disaccharide compositional patterns, respectively. Quantitative and compositional analysis of disaccharides after enzymatic depolymerization showed that the amount of CS in the samples of SCPs ranged from 0% to 28.92 ± 0.03%. All of the SCP samples except for SCP D had ΔDi-2,6diS and had more ΔDi-6S than ΔDi-4S, indicating that they originated from shark cartilage. In the finished products, the amount of CS ranged from 0.58 ± 0.01% to 21.30 ± 0.08%. With the exception of SCP D and two finished products (F and D), which contained CS with lower MWs, the average MW of CS in the SCPs and finished products was approximately 40 kDa or higher than that of MW standard (40 kDa) of CS. These analyses contribute to the evaluation of the quantity and quality of CS in SCPs and finished products containing CS, which is necessary for the manufacture of high-grade nutraceuticals.     

基于Shark的工作流流程的实现方式研究

工作流管理系统目前处于技术发展曲线上的相对成熟阶段，不同的人对工作流的理解不同，从而也出现了众多的工作流软件，如Ofbiz、Enhydra Shark、Osworkflow、Jbpm、Obe等。结合在开发无锡机床股份有限公司客户服务中心中工作流管理系统的一些经验，力图通过对其中一种优秀的工作流引擎Shark的介绍，来促进人们对工作流技术的了解。