Effect of superfine grinding on properties of <Emphasis Type="Italic">Vaccinium bracteatum</Emphasis> Thunb leaves powder

Vaccinium bracteatum Thunb, have been widely used in various traditional medicines and food products. The narrow and uniform particle size distribution in V. bracteatum Thunb leaves (VBTL) can be achieved through a new emerging type of foodstuff processing and superfine grinding. The VBTL powders were subjected to four particle sizes as followed: 300–125, 125–75, 75–40, and <40 μm. The VBTL powders were observed to be with smaller size and bulk density, greater surface area, tapped density and the angle of repose. Water solubility index, water holding capacity and total flavonoid extraction increased slightly with the decrease in particle size. Differential scanning calorimetry showed that the VBTL exhibiting particle size of <40 μm had the lowest peak temperature; whereas, powder with a particle size of 125–300 μm displayed the largest endothermic enthalpy. Our results of the properties of VBTL superfine powder supplied the basis for VBTL in potential industrial applications of foods.     

浅析精梳机锡林与纺纱质量之间的关系

针对危害性纤维、危害性疵点的清除效率和对棉纱棉布的影响与危害,分析了精梳机锡林齿密、齿形与精梳机产量、精梳棉纱成本、梳棉条疵点的清除、精梳棉纱质量的关系;说明精梳棉纱必须依靠精梳工序对危害性疵点、危害性纤维进一步清除,同时采用精梳机高密度顶梳、锡林清除对布面质量具有更大危害性的疵点,死棉、白星、僵斑、毛粒毛球等;通过对增加精梳机锡林齿密与梳棉条疵点、危害性纤维的清除效率和对精梳条、棉纱质量的控制效果分析,说明精梳机锡林齿密的增加,齿形、齿根、齿深的变化,既降低了危害性疵点和危害性纤维,又可以在保证质量的前提条件下减少精梳落棉率,降低纺纱成本.指出:精梳工序是关键性纺纱工序,增加精梳机顶梳密度和锡林齿密,是精梳棉纱降本增效的最佳方式之一;对某些危害性疵点及纤维的清除效果和效率方面,精梳机也许会比梳棉机更直接、更有效;未来精梳棉纱梳理质量的提高重点应向精梳工序倾斜;在发展纺机主机设备的同时,应注重关键纺纱器材的改进提高.     

氨纶与双组分复合长丝/棉包芯纱的拉伸弹性

为改善传统弹力包芯纱弹性回复性能,以氨纶、双组分复合长丝(CM800)为芯纱,棉纤维为外包纤维,设计了13种弹力包芯纱。探讨氨纶预牵伸倍数、芯纱线密度和弹力包芯纱反复拉伸次数与弹性回复率之间的关系。采用纱线强伸仪测试氨纶/棉、CM800/棉和棉双丝弹力包芯纱的拉伸弹性。结果表明:氨纶的牵伸倍数越大,弹力包芯纱的弹性回复率越小;随着氨纶线密度的增加,包芯纱的弹性回复率先增加后减少;CM800线密度越小,包芯纱的弹性回复率越小;氨纶/棉、CM800/棉和棉双丝弹力包芯纱的定伸长5%和定负荷200 c N反复拉伸次数与纱线弹性回复率的关系均符合幂函数关系,且弹力包芯纱的弹性回复率随着纱线反复拉伸次数的增加而降低;CM800/棉包芯纱的弹性回复率最大,氨纶/棉包芯纱的弹性回复率最小。     

静电层层自组装法整理多巴胺改性涤/棉混纺织物的阻燃性能

为了赋予涤/棉混纺织物良好的阻燃性能,以pH值为5、质量分数为1%壳聚糖溶液和pH值为2、质量分数为1.5%植酸钠溶液,通过静电层层自组装法,对经多巴胺改性后的涤/棉(65/35)混纺织物进行阻燃整理。其中正负离子交替沉积1次记为组装1层,第1层内每次组装15 min,第1层后各次组装时间为5 min,共组装15层。探讨了整理后织物极限氧指数(LOI)、炭长、热重、热释放速率、炭渣形貌等性能。结果表明:多巴胺改性可以提高涤/棉混纺织物的反应性,有利于阻燃整理;整理后织物阻燃性能显著提高,LOI值从未整理时的18.8%提高到28.7%;热分解温度比未整理织物大幅提前,炭渣含量较未整理提高了5.7%;整理后织物点燃时间延长,平均热释放速率(HRR)和峰值热释放速率(PHRR)分别为14.16 k W/m2和51.07 k W/m2,相较未整理涤/棉织物下降了84.62%和78.47%,织物燃烧危险性显著降低。     

三维试衣技术研究现状及发展趋势

三维试衣技术为消费者提供了更直观的服装三维立体视觉效果。线上三维试衣技术能使消费者在网上更快捷、便利、真实、有效地挑选服装,并可在服装网购中发挥较大优势。线下三维试衣技术带来了全新的购物体验模式,能为消费者提供更多的搭配选择,并可在短时间内试穿多套服装。目前,国内外对于三维试衣技术的研究已逐渐深入,线上、线下的三维试衣技术都获得了一定的研究成果。介绍了国内外三维试衣技术的发展现状,对比目前市场上三维试衣技术的特点,分析了试衣系统面临的挑战,提出其发展趋势。     

Anti‐inflammatory properties of high pressure‐assisted extracts of Grifola frondosa in lipopolysaccharide‐activated RAW 264.7 macrophages

The aim of this study was to determine the in vitro anti‐inflammatory properties of the shake extract (SE) and the high pressure‐assisted extract (PE) of the mycelia of Grifola frondosa in a lipopolysaccharide‐stimulated RAW 264.7 macrophage model. The content of total polysaccharides and β‐glucans of PE at 600 MPa (PE‐600) was 41.2 and 6.2 mg g^?1 dry weight, respectively, which were significantly higher than SE extracts. The results showed that treatment with 500 μg mL^?1 of PE by 600 MPa (PE‐600) did not reduce RAW 264.7 cell viability but did significantly inhibit the production of LPS‐induced NO, PGE₂ and intracellular ROS. The PE‐600 inhibited the activation of NF‐kB and then reduced the production of LPS‐induced TNF‐α, IL‐6 and IL‐1β in a dose‐dependent manner. Thus, the PE could be used as an alternative extraction method for improving the extraction efficacy of G. frondosa and serve as an alternative source of anti‐inflammatory agents.     

气动书籍包装机的设计与研究

为提高书籍包装的效率,设计一种结构新颖、性能稳定的气动书籍包装机,实现书籍自动装袋包装的功能。利用MATLAB和ADAMS建立运动力学数学模型并进行仿真,利用ANAYS进行关键部件的有限元分析,最后进行实际测试。该包装机关键零部件满足强度与硬度要求,减少了书籍包装的时间,包装成功率高。该气动书籍包装机性能稳定,可以连续高效地实现书籍包装功能,具有较高的经济效益。     

Antioxidant and antibacterial activities of exopolysaccharides from Bifidobacterium bifidum WBIN03 and Lactobacillus plantarum R315

The objective of this study was to investigate the antioxidant and antibacterial activities of exopolysaccharide (EPS) from Bifidobacterium bifidum WBIN03 (B-EPS) and Lactobacillus plantarum R315 (L-EPS). The 1,1-diphenyl-2-picrylhydrazyl (DPPH)-radical scavenging, hydroxyl radical-scavenging, and superoxide radical-scavenging abilities were measured to evaluate antioxidant activity. Inhibition of erythrocyte hemolysis and lipid peroxidation was also measured. Both B-EPS and L-EPS had strong scavenging ability against DPPH and superoxide radicals at high concentration. The inhibitory effect of B-EPS on erythrocyte hemolysis was stronger than that of L-EPS in a concentration range from 0.30 to 1.00 mg/mL, whereas the hydroxyl scavenging ability of L-EPS (39.15 ± 0.58%) was significantly higher than that of 0.15 mg/mL ascorbic acid (24.33 ± 1.17%) and B-EPS (17.89 ± 3.30%) at 0.10 mg/mL. The inhibition of lipid peroxidation of 0.50 mg/mL B-EPS and L-EPS was 13.48 ± 1.74% and 12.43 ± 0.51%, respectively, values lower than that of ascorbic acid at the same concentration (23.20 ± 1.41%). Furthermore, all these abilities were enhanced in a concentration-dependent manner. Agar diffusion assay showed that both EPS exhibited antibacterial activities against tested pathogens such as Cronobacter sakazakii, Escherichia coli, Listeria monocytogenes, Staphyloccocus aureus, Candida albicans, Bacillus cereus, Salmonella typhimurium, and Shigella sonnei at 300 μg/mL. In conclusion, both EPS have antimicrobial and antioxidant activities and could have applications in the food industry.     

基因工程菌Escherichia coli BL21/pET-pel重组果胶酶的纯化及酶学性质

采用超声波破碎法、镍离子亲合层析柱法,纯化重组菌Escherichia coli BL21/pET-pel表达的胞内重组果胶酶,并用十二烷基硫酸钠-聚丙烯酰胺凝胶电泳（sodium dodecyl sulfate-polyacrylamide pelelectrophoresis,SDSPAGE）检测,研究纯化的重组果胶酶酶学性质。结果表明：重组果胶酶纯化倍数为1.71,回收率为88.5%,分子质量约为44 kD。最适pH值为9.0～9.5,在pH 7.0～10.0之间催化性质较稳定;最适作用温度范围为45～55 ℃,在60 ℃下保温30 min还剩余40%的酶活力;在离子浓度为1 mmol/L时,Ca2+和Co2+对该酶有较强的促进作用,而Fe2+则对其有较强的抑制作用。     

服装单件流程生产流水线设计研究

依据案例服装企业实施单件流程生产的实践,进行成衣工艺流程分析和设计。针对流水线生产存在的瓶颈,提出合理编排现场工序及缝制工作地、平衡工序节拍、提高编制效率及实现流水线同步化生产的优化方案,探讨不同批量订单和不同流水线生产方式的成衣单件流程生产模式及应用。