丙烯酰胺接枝改性液体过滤用熔喷聚丙烯非织造布的研究

采用化学接枝改性法,以过氧化苯甲酰为引发剂,研究反应中丙烯酰胺接枝熔喷聚丙烯非织造布的主要影响因素,并对接枝产物的结构及吸湿性能进行了分析。结果表明:实验获得的接枝物润湿性能明显改善。     

Comparative study of proximate composition and amino acid in farmed and wild Pseudobagrus ussuriensis muscles

The proximate composition and amino acid compositions of the muscle of wild and farmed Pseudobagrus ussuriensis were compared. The lipid content of the farmed fish was significantly higher, while moisture content was significantly lower, than those of the wild fish. Pseudobagrus ussuriensis protein has a well‐balanced amino acid composition. The percentages of total amino acids, essential amino acids, nonessential amino acids and delicious amino acids were significantly higher in the wild than those in farmed fish. The ratios of W_EAA to W_TAA (42.78%–43.02%) and W_EAA to W_NEAA (85.52%–87.74%) were comparable to the reference values of 40% and above 60% recommended by FAO/WHO. According to the amino acid scores, methionine would have been described as the first limiting amino acid, and Lys had the highest score for the protein in both wild and farmed Pseudobagrus ussuriensis. This study shows that Pseudobagrus ussuriensis under investigation have high nutritional qualities and are good protein resources.     

响应面优化酸热法从废弃黑曲霉提取壳聚糖工艺

研究以酸热法破除黑曲霉细胞壁提取壳聚糖的工艺。在单因素实验基础上,运用Box-Behnken中心组合实验和响应面法考察了破壁温度、破壁时间和盐酸浓度3个因素对壳聚糖得率的影响,并优化了破壁工艺。结果表明,最佳破壁工艺为:破壁温度100℃,破壁时间1.6h,盐酸浓度2.1%,壳聚糖实际得率为10.87%,理论值11.06%,两者相对误差1.72%,说明响应面法优化酸热破除黑曲霉细胞壁工艺可行。     

基于纹织JCAD软件的仿书法提花织物的工艺设计及产品开发

文章采用纹织JCAD软件,借助现代提花织造技术,开发出仿书法提花织物。从纹织JCAD工艺设计、织物试织、产品效果入手,结合使用图片处理软件与纹织JCAD,选取一种能"逼真"体现书法效果的工艺,解决了在织造过程中织物漏色的难题,并提出了针对低经密织机织造织物的建议。     

抗紫外线泡沫整理工艺的优化

采用泡沫整理技术对棉织物进行抗紫外线整理。研究了整理剂用量、焙烘温度、焙烘时间、发泡机进气量、发泡机车速等因素对整理后织物抗紫外线性能、白度和透气性的影响。结果表明,泡沫整理的织物白度和透气性变化不大,具有良好的服用性能;越温和的焙烘条件,整理织物的抗紫外线性能越好;发泡机进气量越小,织物的抗紫外性能越好;发泡机车速加快,织物的抗紫外性能变差。优化的泡沫整理焙烘条件为140℃,2 min。     

Effects of postharvest sodium silicate treatment on pink rot disease and oxidative stress-antioxidative system in muskmelon fruit

Sodium silicate (Si) at 100 mM was used as a postharvest treatment agent of induction resistance on muskmelon (Cucumis melon L. cv. Yindi) to investigate the mechanism of controlling pink rot disease, which caused by Trichothecium roseum. Si treatment significantly reduced (P < 0.05) the lesion diameter of melons inoculated with T. roseum during storage. Si treatment increased the content of superoxide (O₂^•−) and could be further raised by challenged with T. roseum inoculation. The content of hydroxyl radical (·OH) in inoculated fruit was also increased. Both malondialdehyde (MDA) and hydrogen peroxide (H₂O₂) were also accumulated with Si treatment and challenged inoculation. Si treatment maintained membrane integrity in non-inoculated fruit, as compared to untreated control. Si treatment and challenge inoculation significantly (P < 0.05) increased the activity of superoxide dismutase (SOD), glutathione reductase (GR), peroxidase (POD), and polyphenoloxidase (PPO), while markedly decreased the activity of catalase (CAT) and ascorbic peroxidase (APX). Si treatment and challenge inoculation also enhanced the content of ascorbic acid (ASA) and glutathione (GSH). These findings suggested that the effects of sodium silicate on postharvest disease in muskmelon fruit may be associated with the elicitation of antioxidant defense system in fruit.     

层压复合工艺优化

文章采用正交组合实验,对复合织物的剥离强度、耐静水压、透湿和透气性能进行分析。利用灰色近优综合评定,得出最优工艺。     

米糠油物理精炼过程中脱臭对其谷维素含量的影响

研究了脱臭温度和脱臭时间对米糠油中谷维素含量的影响.结果表明脱臭温度和脱臭时间对米糠油中谷维素的裂解、汽流夹带损失有不同程度的影响,随着脱臭温度升高和脱臭时间的延长,米糠油中谷维素的裂解、汽流夹带损失量呈增大趋势;在米糠油脱臭的实验条件范围内,脱臭温度为210 ℃,脱臭时间为20 min时,米糠油中谷维素留存量最多,其含量为1.73%;脱臭温度为270℃,脱臭时间为120 min时,米糠油中谷维素留存量最少,其含量为1.28%.     

A186系列梳棉机盖板倒转的改造实践

为了在梳棉针布老化及使用原棉品质较差的情况下,有效地降低成纱棉结,针对C 14.6 tex品种进行了梳棉机盖板倒转改造的生产实践.分析了盖板倒转的改造原理,介绍了盖板倒转的改造方法.实践袁明:梳棉机盖板倒转减少棉结的效果明显,盖板倒转尤其适合使用原棉质量较差并且锡林针布老化的企业进行梳棉机改造.     

In vitro antioxidant properties of rutin

Much work has been carried out in recent years on the beneficial effect of phenolic compounds which act as natural antioxidants and help to neutralize free radicals. We analysed the antioxidant activity of the rutin (quercetin-3-rhamnosyl glucoside) using different assays including: total antioxidant activity and reducing power, hydroxyl radical scavenging assay, superoxide radical scavenging assay, 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging assay and lipid peroxidation assay which uses egg yolk as the lipid-rich source. Total antioxidant capacity was determined by the assay based on the decrease in absorbance of β-carotene by the sample. Rutin exhibited strong DPPH radical scavenging activity. At the concentration of 0.05 mg/ml, ascorbic acid (Vc), butylated hydroxytoluene (BHT) and rutin showed 92.8%, 58.8%, and 90.4% inhibition, respectively. In addition, rutin had effective inhibition of lipid peroxidation. Those various antioxidant activities were compared to standard antioxidants such as BHT and Vc.