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1.
Study of antimicrobial activity of aloevera, chitosan, and curcumin on cotton, wool, and rabbit hair 总被引：1，自引：0，他引：1
Aloevera, chitosan, and curcumin were applied in alone and in combination with each others on cotton, wool and rabbit hair
by exhaustion method for the assessment of their antimicrobial activity. The antimicrobial activity of these natural ingredients
was better in peroxide treated cotton, formic acid treated wool/rabbit hair fibrous substrates than their corresponding intact
ones. Aloevera shown better antimicrobial activity than chitosan and curcumin when applied alone and its antimicrobial activity
was enhanced by addition of both chitosan and curcumin. The application of aloevera+chitosan+curcumin combination on peroxide
treated cotton and formic acid treated wool/rabbit hair fibrous substrate was fast up to twenty five washing cycles. 相似文献
2.
Rahul Navik Faizan Shafiq Asfandyar Khan Manoj Datta Xiongyi Peng Md. Kamruzzaman Yingjie Cai 《Fibers and Polymers》2017,18(6):1115-1123
Wool fabric was treated with liquid ammonia at -40 °C for 30 and 60 s prior to the application of polypyrrole (PPy). The polymer was deposited on wool fiber using the chemical oxidation method with 0.02 and 0.05 mol/l (Py) monomer concentration and FeCl3 as a catalyst. Functional groups of wool samples were analyzed using FT-IR, and surface morphology was investigated using SEM micrographs. Properties such as water absorbency, surface resistivity, abrasion resistance, weight add-on, and air permeability of coated specimens were explored. The FT-IR outcomes revealed the liquid ammonia pre-treatment changed the amount of amide I (NH), cystic acid, cystic monoxide, and dioxide content of the fiber. SEM micrographs revealed the descaling of wool surface after pre-treatment and smooth coating of polymer. Pre-treatment of wool in liquid ammonia improved absorbency of wool fabric with respect to the treatment duration. The surface resistivity of wool fabric decreased with the increase of monomer concentration and pre-treatment duration. The results of abrasion resistance confirmed that the pre-treated fabric exhibited lower loss of polymer after 200 cycles of abrasion. The weight of the fabric was increased and air permeability decreased when the monomer concentration and liquid ammonia pre-treatment duration was increased. 相似文献
3.
C. W. Kan 《Fibers and Polymers》2006,7(3):262-269
In this paper, the effects of low temperature plasma (LTP) treatment on the dyeing properties of the wool fiber were studied.
The wool fibers were treated with oxygen plasma and three types of dye that commonly used for wool dyeing, namely: (i) acid
dye, (ii) chrome dye and (iii) reactive dye, were used in the dyeing process. For acid dyeing, the dyeing rate of the LTP-treated
wool fiber was greatly increased but the final dyeing exhaustion equilibrium did not show any significant change. For chrome
dyeing, the dyeing rate of the LTP-treated wool fiber was also increased but the final dyeing exhaustion equilibrium was only
increased to a small extent. In addition, the rate of afterchroming process was similar to the chrome dyeing process. For
the reactive dyeing, the dyeing rate of the LTP-treated wool fiber was greatly increased and also the final dyeing exhaustion
equilibrium was increased significantly. As a result, it could conclude that the LTP treatment could improve the dyeing behavior
of wool fiber in different dyeing systems. 相似文献
4.
A descaling and oxidation pretreatment was employed to maximize the yield of cortical cells in the disintegration process of wool fiber. The results indicated that the productivity of intact cortical cells was greatly increased by moderate oxidation pretreatment in 1.6 % per-acetic acid within 2 h, but the yield would be decreased by further oxidation pretreatment. In order to give a reasonable explanation for this fact, the effect of the increasing time of oxidation pretreatment on the yield of intact cortical cells was investigated by means of spectral analysis using FT-IR and XRD. The intensity of the peak at 1040 and 1173 cm?1 in FT-Infrared spectrum gradually increased with increasing oxidation pretreatment time, suggesting that more and more SS bonds were cleaved to form cysteic acid. X-ray Diffraction investigation showed that the crystallinity of wool fiber obviously decreased when the time of oxidation pretreatment exceeded 2 h. The combined results of FT-IR and XRD revealed that SS bonds in the amorphous region of wool fiber were first cleaved in the fiber components. The selective cleavage of SS bonds in the amorphous region by the appropriate oxidation pretreatment can effectively decrease the bonding force between the components of wool fiber and enhance the yield of intact cortical cells. 相似文献
5.
In this study, electrospun wool keratose (WK)/silk fibroin (SF) blend nanofiber was prepared and evaluated as a heavy metal
ion adsorbent which can be used in water purification field. The WK, which was a soluble fraction of oxidized wool keratin
fiber, was blended with SF in formic acid. The electrospinnability was greatly improved with an increase of SF content. The
structure and properties of WK/SF blend nanofibers were investigated by SEM, FTIR, DMTA and tensile test. Among various WK/SF
blend ratios, 50/50 blend nanofiber showed an excellent mechanical property. It might be due to some physical interaction
between SF and WK molecules although FTIR result did not show any evidence of molecular miscibility. As a result of metal
ion adsorption test, WK/SF blend nanofiber mats exhibited high Cu2+ adsorption capacity compared with ordinary wool sliver at pH 8.5. It might be due to large specific surface area of nanofiber
mat as well as numerous functional groups of WK. Consequently, the WK/SF blend nanofiber mats can be a promising candidate
as metal ion adsorption filter. 相似文献
6.
Laser treatment is one of the technologies which are able to eliminate all the adverse effects on the environment caused by
chemical treatment commonly used in textile finishing. In this research, we investigated the use of laser treatment for the
purpose of wool felting shrinkage control, and compared its effectiveness with that of the traditional chlorination treatment
method. The wool fabric was exposed to an industrial laser at two different power levels and two sweep speeds. We found that
upon selecting the appropriate treatment parameters, the laser treatment is effective in reducing felting shrinkage of wool
fiber by its etching effects on the scales of the wool fiber as shown by the scanning electron micrographs. Too high energy
exposure of the wool fiber by laser radiation causes excessive fabric strength loss. We also found that the laser-treated
wool has felting shrinkage reduction similar to that treated using the traditional chlorination procedure. The laser technology
presents an alternative wool processing method to replace the tradition chlorine treatment method. If this technology can
be applied to wool felting-proof finishing on a commercial scale, it will significantly benefit the environment by completely
elaminating the harzardous chlorine compounds currently by the industry. 相似文献
7.
Shanlan rice is an endemic upland rice in Hainan province, China. In this study, we investigated the effects of ultrasonic treatment (UT) on the cooking and fermentation properties of Shanlan rice. These effects were evaluated by multiple physical and chemical indicators via scanning electron microscopy (SEM), low-field nuclear magnetic resonance (LF-NMR), and high-performance liquid chromatography (HPLC). According to the minimal cooking time and the content of total leached solids, the optimal ultrasonic power and time were determined to be 240 W and 30 min, respectively. The results indicated that the ultrasonic treatment broke the rice surface, loosened the inner structure of rice, and extended the relaxation time. These changes increased water absorption during the cooking process by 8.2% and promoted saccharification and alcohol production at the initial fermentation stage, with a 54.1% higher alcohol content on the first day. The rice wine brewed from the treated rice showed differences in the non-volatile acid contents; malic acid and tartaric acid contents increased, while the acetic acid content decreased significantly. Moreover, the red colour and brightness of the rice wine were significantly improved after the ultrasonic treatment, with a 16.6% increase in the rice wine yield. 相似文献
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10.
为提高澳洲坚果油提取得率并获得高品质油脂,采用超声波辅助法提取澳洲坚果油,并分析提取油脂的理化性质。首先通过单因素实验考察了提取溶剂、超声功率、超声时间以及液料比对提取率的影响,然后通过响应面法优化了提取工艺参数。结果表明,正己烷对澳洲坚果油提取率较高;适当增加超声波功率、超声时间以及溶剂量,澳洲坚果油得率均随之增加;通过响应面优化,超声波辅助提取澳洲坚果油的最佳提取条件为：液料比为9.6∶1（mL/g）,超声功率为520 W,超声时间为32 min,澳洲坚果油得率达69.1%,2次提取总得率达96.3%。研究结果表明超声波辅助提取是一种有效的油脂提取方法,从脂肪酸成分比例及理化性质来看,澳洲坚果油营养价值较高。 相似文献
11.
采用响应面法优化超声波辅助提取薏苡仁低聚糖的工艺条件。在单因素试验基础上,选取液料比、超声波时间以及超声波功率3个因素结合Box-Behnken试验建立数学模型,分析考察3个因素对薏苡仁低聚糖响应值的影响程度,优化工艺参数。各因素对薏苡仁低聚糖提取率影响程度从大到小顺序依次为:超声波功率超声波时间液料比。响应面设计法优化出其最佳超声波提取条件为:超声波温度70℃,液料比33∶1(m L/g),超声波时间27 min,超声波功率450 W。在该条件下,薏苡仁低聚糖提取率为0.94%,与模型预测值0.98%接近。说明使用响应面法优化超声波辅助提取薏苡仁低聚糖的工艺条件是可行的。 相似文献
12.
A water and dye-free heat treatment method was used to color wool fibers. The heat effect changed wool fibers to different colors from white in a nitrogen atmosphere. The influences of heating temperature and time on the colors of wool were investigated and the mechanical property of colored wool fibers was evaluated. The color strength of wool fibers increased as heat treatment temperature and time increased. The tensile strength retention rate of wool fiber was relatively high (≥90 %) when the heat temperature was below 200 °C. The surface morphologies of wool fibers scarcely changed during the heat treatment. The carbon content of fibers was found to reduce by heat treatment, indicating oxidization of components in the wool fibers in the process of coloration. Heat treatment may provide a water and dye-free approach to color wool and other textile fibers, albeit within a limited color range. 相似文献
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咖啡作为世界三大饮料之一,中国咖啡主要分布在海南和云南地区。本研究以海南兴隆咖啡豆为原料,探究超声波辅助冷萃技术（以下简称超声冷萃）制备咖啡液的最优条件,并测定咖啡因、葫芦巴碱、绿原酸含量以及咖啡渣的微观结构。以超声时间、超声温度和超声功率为单因素,咖啡液总可溶性固形物提取率为评价指标,在单因素试验的基础上,利用Box-Behnken原理设计3因素3水平响应面试验,对超声冷萃提取条件进行优化得到最佳提取工艺,并以传统冷浸法为对照,采用超高效液相色谱法测定咖啡液葫芦巴碱、咖啡因、绿原酸的含量,扫描电子显微镜测定咖啡渣微观结构。结果表明,适当增加超声功率、超声时间和超声温度,咖啡液总可溶性固形物随之增加,影响咖啡液总可溶性固形物的提取率的主次因素为超声功率>超声时间>超声温度,超声冷萃制备咖啡液的最佳工艺参数为：超声功率500 W、超声时间35 min、超声温度20℃,在优化条件下,总可溶性固形物提取率为22.92%±0.16%,与响应面优化试验回归模型预测值（22.85%±0.12%）基本吻合。与传统冷浸法相比,超声冷萃制备所得咖啡液葫芦巴碱、咖啡因和绿原酸（3-CQA、4-CQA、5-CQA）含量分别为175.19 mg/L、317.71 mg/L和257.77 mg/L,均有所提高,咖啡渣表面微观结构更为破碎,说明超声冷萃破坏了植物细胞壁,从而释放出更多的可溶性物质,且超声冷萃显著缩短萃取时间。本研究优化制备咖啡液的超声冷萃提取工艺,结果表明超声波冷萃是一种有效的咖啡液提取技术,为咖啡精深加工及高值化产品研发提供理论依据和技术支撑。 相似文献
15.
Qiang Wang Ping Wang Xuerong Fan Li Cui Xianfei Zhao Xiaoxiao Gao 《Fibers and Polymers》2009,10(5):724-730
The enzymatic antifelting of wool with proteases, which is referred to as bio-antifelting, has become a promising eco-friendly alternative to conventional chlorination treatment. However, wool bio-antifelting in industrial scale has not been reached so far due to its unsatisfactory shrink-resistance and uncontrolled action in fiber damage. In this paper, the action and mechanism of two kinds of chemical pretreatments, i.e., hydrogen peroxide and dichlorodicyanuric acid pretreatments on the shrink-resistance of protease-treated wool fabrics were investigated and compared. The results show that although hydrogen peroxide treatment could decrease the shrinkage of wool in comparison with untreated one, its contribution to the enhancement of wool bio-antifelting with protease was not remarkable. An effective shrink-resistance can be obtained when the wool fabric was treated with dichlorodicyanuric acid and protease consecutively. Both of the two chemical pretreatments could improve the wettability and whiteness of protease-treated wool. The mechanism of different pretreatments for enhancing wool bio-antifelting with protease was further illustrated and compared via several microscopic analyses such as Allwörden’s reaction, FTIR-ATR and SEM. The comprehensive comparison for wool bio-antifelting based on different chemical pretreatments reveals the difference of hydrogen peroxide and dichlorodicyanuric acid pretreatments in antifelting mechanism, which is valuable for getting a clear understanding and further modification of wool bio-antifelting. 相似文献
16.
Short wool fibers obtained by the stretch breaking process can be blended with cotton fibers and processed in a cotton spinning
system, which has a high production rate. For the structural property of the wool fiber after stretch breaking, the diameter
and length of the wool fiber were measured as a function of time. The diameter of the broken fibers was finer than the diameter
of untreated fibers. The fiber diameter at the break point was the finest and was more irregular than the original fiber.
The broken fiber showed mechanical properties of increased modulus, decreased breaking strain, and increased breaking strength. 相似文献
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18.
Previous investigation results revealed that after the Low Temperature Plasma (LTP) treatment, the hydrophilicity of wool
fiber was improved significantly. Such improvement enhances the wool dyeing and finishing processes which might be due to
the changes of the wool surface to a more reactive one. In this paper, wool fibers were treated with LTP with different gases,
namely, oxygen, nitrogen and gas mixture (25 % hydrogen/75 % nitrogen). Investigations showed that chemical composition of
wool fiber surface varied differently with the different plasma gas used. The surface chemical composition of the different
LTP-treated wool fibers was evaluated with different characterization methods, namely FTIR-ATR, XPS and saturated adsorption
value. The experimental results were thoroughly discussed. 相似文献
19.
In order to overcome the existing challenges on the production time and quality, a novel dough resting method of fresh wet noodles via ultrasonic processing was developed. The changes of the starch, protein hydration and gluten network formation after ultrasonic treatment were investigated. The sensory quality, secondary structure and cross section morphology of dough were characterized. The results showed that ultrasonic treatment could improve the texture of wheat dough, promote the hydration of starch and protein, and increase the cooking quality. Compared with the control group, the hardness of fresh noodles decreased by 14.19%, and tensile force significantly increased by 33.43% after treatment under ultrasonic power density of 66 W/L. Viscoelastic, SEM and FTIR characterization results also verified that the angle of loss (tanδ) and surface roughness was decreased, and the content of α-helix significantly increased via ultrasonic treatment. It could be observed that the ultrasonic resting could reduce the surface tension between protein and water molecules to promote the formation of gluten network and protein hydration. Therefore, ultrasonic treatment could facilitate to reduce the resting processing time and improve the quality of fresh wet noodles. 相似文献