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Research progress in Ramie fiber extraction: Degumming method, working mechanism, and fiber performance 苎麻纤维提取的研究进展:脱胶方法、工作机理和纤维性能
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119876
Ramie fiber, recognized as king of natural fibers, is one of the strongest and longest natural fiber. The fabric made of ramie fibers exhibits the compelling features of being crisp and cool, fast moisture absorption and heat dissipation, as well as favorable air permeability and antibacterial. Since cellulose fibers in raw ramie are stuck tightly by gummy substances consisting of pectin, hemicellulose and lignin, a degumming process is necessary to separate these gummy materials prior to the downstream spinning process. High purified ramie cellulose fibers are supposed to be extracted with high degumming efficiency. However, currently most commonly adopted degumming methods show some inevitable defects, such as long degumming process, high operating cost, serious environmental pollution, and uncontrollable fiber quality. These mentioned issues should be properly addressed in future research work to promote the advancement of ramie fiber industry. The development of green, ecological, environmentally friendly, clean and efficient ramie degumming methods has attracted more and more attention. In this review, the methodologies of degumming processing, including mechanical, chemical, biological and combined degumming methods, are summarized systematically and the resultant properties are also covered. In addition, some research conclusions will be drawn by analyzing the latest process in this field, as well as the views on the remaining challenges and some scientific perspectives or outlook will be finally given for potential readers.
苎麻纤维是公认的天然纤维之王,是强度最高、长度最长的天然纤维之一。用苎麻纤维制成的织物具有清爽凉快、吸湿散热快、透气性好、抗菌性强等显著特点。由于原料苎麻中的纤维素纤维会被果胶、半纤维素和木质素等胶状物质紧紧粘住,因此在下游纺纱工艺之前,必须采用脱胶工艺将这些胶状物质分离出来。高纯度的苎麻纤维素纤维应该以较高的脱胶效率提取出来。然而,目前普遍采用的脱胶方法存在一些不可避免的缺陷,如脱胶过程长、运行成本高、环境污染严重、纤维质量不可控等。这些问题都需要在今后的研究工作中妥善解决,以促进苎麻纤维产业的发展。开发绿色、生态、环保、清洁、高效的苎麻脱胶方法已引起越来越多的关注。本综述系统地总结了脱胶处理的方法,包括机械脱胶法、化学脱胶法、生物脱胶法和联合脱胶法等,并对脱胶后的性能进行了阐述。此外,还将通过分析该领域的最新进展得出一些研究结论,并对尚存的挑战发表看法,最后为潜在读者提供一些科学观点或展望。
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引用次数: 0
Experimental and kinetic analysis of Bambusa tulda pyrolysis in carbon dioxide and nitrogen atmosphere 二氧化碳和氮气环境下簕杜鹃热解的实验和动力学分析
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119806
<div><div>Experiments were conducted using a fixed-bed pyrolysis system and a thermo-gravimetric analyzer to investigate the effect of <span><math><msub><mrow><mi>N</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> and <span><math><mrow><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub><mspace></mspace></mrow></math></span> atmosphere on thermal degradation, physicochemical, structural, and elemental characteristics of <em>Bambusa tulda</em> and its char. A kinetic study was conducted at four different heating rates to determine the activation energy, pre-exponential factor, and kinetic model. The results indicate significant weight loss during the second stage of pyrolysis, primarily due to the thermal degradation of low molecular weight compounds such as hemicelluloses, cellulose, and a small fraction of lignin. The <span><math><mrow><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub><mspace></mspace></mrow></math></span>atmosphere leads to more significant weight loss compared to<span><math><mrow><mspace></mspace><msub><mrow><mi>N</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> atmosphere, with an average weight loss of about 80 % under <span><math><msub><mrow><mi>N</mi></mrow><mrow><mn>2</mn><mspace></mspace></mrow></msub></math></span> and approximately 95 % under <span><math><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>. This difference is likely due to specific gas-phase reactions and the consumption of carbon fuel induced by <span><math><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>. Iso-conversional methods determined that the average activation energy of <em>Bambusa tulda</em> in the presence of <span><math><msub><mrow><mi>N</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> was 160.05 kJ mol<sup>−1</sup>, whereas under<span><math><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>, it was 105.51 kJ mol<sup>−1</sup>. The kinetic mechanism of <em>B. Tulda</em> for both the atmosphere was validated using Cardio’s master plots. The data points for activation energy and pre-exponential factors show a strong linear fit across incremental conversion fractions, indicating the presence of the kinetic compensation effect. Biochar produced in <span><math><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> atmosphere (BCC) exhibited larger pores than biochar generated in <span><math><mrow><msub><mrow><mi>N</mi></mrow><mrow><mn>2</mn></mrow></msub><mspace></mspace></mrow></math></span> atmosphere (BCN). BCN has a porous, organized structure, while BCC displays pores with a channel-like structure due to the development of an aromatic structure. The carbon content and calorific value of <em>Bambusa tulda</em> char are noteworthy, with values of 81.23 % and 25.36 MJ kg<sup>−1</sup> for N<sub>2</sub> atmosphere, and 85.16 % and 29.44 MJ kg<sup>−1</sup> for <span><math><msub><mrow><mi>CO</mi></mrow><mrow><mn
使用固定床热解系统和热重分析仪进行了实验,以研究 N2 和 CO2 气氛对簕杜鹃及其焦炭的热降解、物理化学、结构和元素特性的影响。在四种不同的加热速率下进行了动力学研究,以确定活化能、预指数和动力学模型。结果表明,在热解的第二阶段,主要由于低分子量化合物(如半纤维素、纤维素和一小部分木质素)的热降解,重量损失明显。与 N2 气氛相比,CO2 气氛导致的重量损失更为显著,N2 气氛下的平均重量损失约为 80%,而 CO2 气氛下的平均重量损失约为 95%。这种差异可能是由于二氧化碳引起的特定气相反应和碳燃料消耗造成的。等转换法确定,在 N2 存在下,图尔达簕竹的平均活化能为 160.05 kJ mol-1,而在 CO2 下,平均活化能为 105.51 kJ mol-1。使用卡迪奥主图验证了两种气氛下簕杜鹃的动力学机制。活化能和前指数因子的数据点在各个增量转化分数上显示出很强的线性拟合,表明存在动力学补偿效应。与在氮气环境中生成的生物炭(BCN)相比,在二氧化碳环境中生成的生物炭(BCC)孔隙更大。BCN 具有多孔、有序的结构,而 BCC 则由于芳香结构的形成而显示出具有通道状结构的孔隙。簕杜鹃炭的含碳量和热值值得注意,在氮气环境下分别为 81.23 % 和 25.36 兆焦耳/千克-1,在二氧化碳环境下分别为 85.16 % 和 29.44 兆焦耳/千克-1,这表明其具有作为气化过程原料或化石燃料替代品的潜力。
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A kinetic study was conducted at four different heating rates to determine the activation energy, pre-exponential factor, and kinetic model. The results indicate significant weight loss during the second stage of pyrolysis, primarily due to the thermal degradation of low molecular weight compounds such as hemicelluloses, cellulose, and a small fraction of lignin. The &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;atmosphere leads to more significant weight loss compared to&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; atmosphere, with an average weight loss of about 80 % under &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and approximately 95 % under &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;. This difference is likely due to specific gas-phase reactions and the consumption of carbon fuel induced by &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;. Iso-conversional methods determined that the average activation energy of &lt;em&gt;Bambusa tulda&lt;/em&gt; in the presence of &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; was 160.05 kJ mol&lt;sup&gt;−1&lt;/sup&gt;, whereas under&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, it was 105.51 kJ mol&lt;sup&gt;−1&lt;/sup&gt;. The kinetic mechanism of &lt;em&gt;B. Tulda&lt;/em&gt; for both the atmosphere was validated using Cardio’s master plots. The data points for activation energy and pre-exponential factors show a strong linear fit across incremental conversion fractions, indicating the presence of the kinetic compensation effect. Biochar produced in &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; atmosphere (BCC) exhibited larger pores than biochar generated in &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; atmosphere (BCN). BCN has a porous, organized structure, while BCC displays pores with a channel-like structure due to the development of an aromatic structure. The carbon content and calorific value of &lt;em&gt;Bambusa tulda&lt;/em&gt; char are noteworthy, with values of 81.23 % and 25.36 MJ kg&lt;sup&gt;−1&lt;/sup&gt; for N&lt;sub&gt;2&lt;/sub&gt; atmosphere, and 85.16 % and 29.44 MJ kg&lt;sup&gt;−1&lt;/sup&gt; for &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn","PeriodicalId":13581,"journal":{"name":"Industrial Crops and Products","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanical performance of windmill palm reinforced textile fabrics and their sustainable composite 风车棕榈增强织物及其可持续复合材料的机械性能
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119776
Windmill palm fibers, as a new type of cellulose fiber, have several advantages such as being environmentally friendly, lightweight, and having excellent mechanical properties. In this paper, different types of windmill palm fibers were used to prepare fabrics. Then, the fabrics were used to prepare palm fabric reinforced composites. The structure and mechanical properties of the raw, alkalized, as well as bleached windmill palm fibers, fabrics, and composites were characterized. The results showed that the windmill palm fibers with removed hemicellulose had the highest mechanical performance, with tensile strength and Young's modulus being 252.72±60.42 MPa and 1.07±0.32 GPa. At the same time, the palm reinforced composites with alkalized windmill palm fiber were endowed with higher mechanical properties with a tensile strength of 69.89±6.30 MPa. The bleached windmill palm fiber exhibited the highest wear resistance. While the alkalized windmill palm fiber had a well UV resistant property. Both alkali treatment and bleach treatment had a positive effect on enhancing the mechanical properties of the palm reinforced composites. The palm reinforced composites are partially degradable, which plays a positive role in promoting carbon neutrality.
风车棕榈纤维作为一种新型纤维素纤维,具有环保、轻质、机械性能优异等优点。本文使用不同类型的风车棕榈纤维制备织物。然后,用这些织物制备棕榈织物增强复合材料。对未加工、碱化以及漂白的风车棕榈纤维、织物和复合材料的结构和机械性能进行了表征。结果表明,去除半纤维素的风车棕榈纤维具有最高的机械性能,拉伸强度和杨氏模量分别为 252.72±60.42 MPa 和 1.07±0.32 GPa。同时,碱化风车棕榈纤维的棕榈增强复合材料具有更高的力学性能,抗拉强度为 69.89±6.30 兆帕。漂白风车棕榈纤维表现出最高的耐磨性。而碱化风车棕榈纤维具有良好的抗紫外线性能。碱处理和漂白处理对提高棕榈增强复合材料的机械性能都有积极作用。棕榈增强复合材料可部分降解,这对促进碳中和起到了积极作用。
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引用次数: 0
HaVTE1 confers ABA insensitivity by blocking the ABA signaling pathway in sunflowers (Helianthus annuus L.) HaVTE1 通过阻断向日葵(Helianthus annuus L.)中的 ABA 信号通路赋予其 ABA 不敏感性
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119850
Sunflower (Helianthus annuus) is the fourth major oilseed crop in the world, with remarkable tolerance in saline-alkali soils. The VTE1 gene encodes tocopherol cyclase (TC), an enzyme pivotal in the biosynthesis of both vitamin E and vitamin K1. Despite its integral role in the synthesis of these crucial vitamins, the functional analysis of VTE1 under abiotic stress in sunflowers remains scant. In the present investigation, a structural analysis of the VTE1 protein across 155 diverse species revealed a highly conserved evolutionary trace. The expression profiling of HaVTE1 depicted that the HaVTE1 was responsive to the ABA pathway. Transgenic results confirmed that overexpression of HaVTE1 in Arabidopsis and sunflower showed decreased sensitivity to ABA while knocking-down in sunflower exhibited the opposite phenotype. Furthermore, biochemical experiments displayed that HaVTE1 decreases ABA sensitivity by scavenging superoxide contents. Concurrently, the transcriptome analysis revealed that HaVTE1 blocked the upstream of the ABA signaling cascade, which was further confirmed by luciferase assay, resulting in reduced sensitivity to ABA of HaVTE1 overexpression plants. The findings shed light on a theoretical basis for the sunflower responses to ABA signaling and abiotic stresses.
向日葵(Helianthus annuus)是世界第四大油料作物,对盐碱土具有显著的耐受性。VTE1 基因编码生育酚环化酶(TC),这是一种在维生素 E 和维生素 K1 的生物合成中起关键作用的酶。尽管 VTE1 在这些重要维生素的合成过程中发挥着不可或缺的作用,但对向日葵非生物胁迫下 VTE1 的功能分析仍然很少。本研究对 155 个不同物种的 VTE1 蛋白进行了结构分析,发现了其高度保守的进化轨迹。对 HaVTE1 的表达谱分析表明,HaVTE1 对 ABA 途径具有响应性。转基因结果证实,在拟南芥和向日葵中过表达 HaVTE1 会降低对 ABA 的敏感性,而在向日葵中敲除 HaVTE1 则表现出相反的表型。此外,生化实验表明,HaVTE1 通过清除超氧化物含量来降低对 ABA 的敏感性。同时,转录组分析表明,HaVTE1 阻断了 ABA 信号级联的上游,这一点在荧光素酶检测中得到了进一步证实,从而导致 HaVTE1 过表达植株对 ABA 的敏感性降低。这些发现为向日葵对 ABA 信号和非生物胁迫的响应提供了理论依据。
{"title":"HaVTE1 confers ABA insensitivity by blocking the ABA signaling pathway in sunflowers (Helianthus annuus L.)","authors":"","doi":"10.1016/j.indcrop.2024.119850","DOIUrl":"10.1016/j.indcrop.2024.119850","url":null,"abstract":"<div><div>Sunflower (<em>Helianthus annuus</em>) is the fourth major oilseed crop in the world, with remarkable tolerance in saline-alkali soils. The <em>VTE1</em> gene encodes tocopherol cyclase (TC), an enzyme pivotal in the biosynthesis of both vitamin E and vitamin K1. Despite its integral role in the synthesis of these crucial vitamins, the functional analysis of <em>VTE1</em> under abiotic stress in sunflowers remains scant. In the present investigation, a structural analysis of the VTE1 protein across 155 diverse species revealed a highly conserved evolutionary trace. The expression profiling of <em>HaVTE1</em> depicted that the <em>HaVTE1</em> was responsive to the ABA pathway. Transgenic results confirmed that overexpression of <em>HaVTE1</em> in <em>Arabidopsis</em> and sunflower showed decreased sensitivity to ABA while knocking-down in sunflower exhibited the opposite phenotype. Furthermore, biochemical experiments displayed that <em>HaVTE1</em> decreases ABA sensitivity by scavenging superoxide contents. Concurrently, the transcriptome analysis revealed that <em>HaVTE1</em> blocked the upstream of the ABA signaling cascade, which was further confirmed by luciferase assay, resulting in reduced sensitivity to ABA of <em>HaVTE1</em> overexpression plants. The findings shed light on a theoretical basis for the sunflower responses to ABA signaling and abiotic stresses.</div></div>","PeriodicalId":13581,"journal":{"name":"Industrial Crops and Products","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A clean deconstruction of steam-exploded corn straw into high purity cellulose nanosheets and well-defined lignin nanotubes 将蒸汽爆破的玉米秸秆清洁解构为高纯度纤维素纳米片和定义明确的木质素纳米管
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119765
The efficient and structure-protective isolation of the main components of lignocellulosic biomass remains challenging for value-added utilization. In this study, we used corn straw waste, a vast yet underexplored biomass from agricultural residues, as the raw material to extract high-purity cellulose nanosheets and recycle the lignin components as well-defined lignin nanotubes (LNTs) in a tandem process. The process consisted of a feasible dilute alkali-assisted wet ball milling treatment of steam-exploded corn straw into high-purity cellulose nanosheets and a lignin solution, which was further transferred into LNTs by a molecular assembly method. Purity, morphology, chemical structure, and thermal behavior of high-purity cellulose nanosheets and LNTs were examined. The 98.9 wt% purity of the high-purity cellulose nanosheets was achieved with a crystallinity of 36.9 %, providing a solid foundation for further chemical modification. The LNTs exhibited remarkable antioxidant activity, opening new avenues for the development of lignin-based functional materials and fundamental research.
高效分离木质纤维素生物质的主要成分并保护其结构,对于增值利用而言仍是一项挑战。在这项研究中,我们以玉米秸秆废料(一种来自农业残留物的大量但尚未得到充分开发的生物质)为原料,通过串联工艺提取高纯度纤维素纳米片,并将木质素成分回收为定义明确的木质素纳米管(LNTs)。该工艺包括采用可行的稀碱辅助湿球磨法将蒸汽爆破的玉米秸秆处理成高纯度的纤维素纳米片和木质素溶液,再通过分子组装法将其转化为 LNT。研究了高纯度纤维素纳米片和 LNT 的纯度、形态、化学结构和热行为。高纯度纤维素纳米片的纯度为 98.9%,结晶度为 36.9%,为进一步的化学改性奠定了坚实的基础。LNTs 具有显著的抗氧化活性,为木质素基功能材料的开发和基础研究开辟了新途径。
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引用次数: 0
Preparation, properties, and characterization of dual-modified tapioca starch and its composite film 双重改性木薯淀粉及其复合膜的制备、性能和表征
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119840
Traditional packaging materials easily cause white pollution, developing green biological packaging is highly important for environmental sustainability. In this study, double-modified tapioca starch (DMTS) was prepared and characterized. Further, clove essential oil (Ceo) at concentrations of 0.5 %/0.75 %/1.0 %/1.25 % (wt%) was loaded into the DMTS film matrix to develop an applicable active packaging material. XRD analysis and FT-IR results revealed that esterified starch was successfully prepared, the DM/CS/Ceo films had a dense intermolecular network, and the Ceo was successfully incorporated into the polymer matrix. The performance test results demonstrate well-performing mechanical, hydrophobic, and antioxidant properties of Ceo series composite films. Specifically, the EAB of the 1.25 % Ceo film increased by 10.7 %, the water contact angle increased by 18.89°, and the DPPH free radical clearance increased by 12.79 times compared to that of the DM film. In addition, the inhibition rates of the 1.25 % Ceo film against Escherichia coli and Staphylococcus aureus reached 86.51 % and 86.84 %, respectively. These results indicate that Ceo films have tremendous potential application value in prolonging food storage life.
传统包装材料容易造成白色污染,开发绿色生物包装对环境的可持续发展至关重要。本研究制备了双改性木薯淀粉(DMTS)并对其进行了表征。此外,还在 DMTS 薄膜基质中添加了浓度为 0.5 %/0.75 %/1.0 %/1.25 %(重量百分比)的丁香精油(Ceo),以开发一种适用的活性包装材料。XRD 分析和 FT-IR 结果表明,酯化淀粉已成功制备,DM/CS/Ceo 薄膜具有致密的分子间网络,Ceo 已成功融入聚合物基质。性能测试结果表明,Ceo 系列复合薄膜具有良好的机械性能、疏水性和抗氧化性。与 DM 薄膜相比,1.25% Ceo 薄膜的 EAB 增加了 10.7%,水接触角增加了 18.89°,DPPH 自由基清除率增加了 12.79 倍。此外,1.25 % Ceo 薄膜对大肠杆菌和金黄色葡萄球菌的抑制率分别达到了 86.51 % 和 86.84 %。这些结果表明,Ceo 薄膜在延长食品储藏寿命方面具有巨大的潜在应用价值。
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引用次数: 0
Bringing bioactive peptides into drug discovery: Challenges and opportunities for medicinal plants 将生物活性肽引入药物研发:药用植物的挑战与机遇
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119855
The pervasiveness of lifestyle diseases is gradually increasing at an alarming rate worldwide. Physicians are prescribing many drug interventions to patients; however, the majority of them are found to have undesirable side effects. Thus, identifying natural alternatives is the principal goal of the pharma industry. Medicinal plants are the depository of diverse natural peptide products and peptides in the genome and awaiting their discovery. This review focuses on the techniques wet-lab and in silico, as well as their strengths and limitations, to extract, identify, and screen novel bioactive peptides. Once the bioactivities have been ascribed to a peptide using various in silico tools, docking is performed with the target to assess its interaction. Then, in vitro and in vivo experiments are designed to check their activity and efficacy on animal models. The discovery of novel bioactive peptides, augmented by advancements in recombinant technology and machine learning, is bound to keep pharmaceutical companies interested in peptide-based drugs. In addition, we have also discussed medicinal plants and novel approaches, such as DNA-based bioactive peptide development approaches currently being utilized in this regard.
生活方式疾病在全球范围内以惊人的速度逐渐蔓延。医生为患者开出了许多药物干预处方,但其中大多数都有不良副作用。因此,寻找天然替代品成为制药业的主要目标。药用植物是基因组中各种天然肽产品和肽的宝库,正等待着人们去发掘。本综述将重点介绍用于提取、鉴定和筛选新型生物活性肽的湿实验室和硅学技术及其优势和局限性。一旦利用各种硅学工具确定了多肽的生物活性,就会与靶标进行对接,以评估其相互作用。然后,设计体外和体内实验,检查其在动物模型上的活性和功效。新型生物活性肽的发现,再加上重组技术和机器学习的进步,必将使制药公司对基于肽的药物产生浓厚的兴趣。此外,我们还讨论了药用植物和新方法,如目前正在使用的基于 DNA 的生物活性肽开发方法。
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引用次数: 0
Comparative study of the physical and mechanical properties of Bambusa vulgaris fibers from Cameroon for application to hybrid composite materials 喀麦隆簕杜鹃纤维应用于混合复合材料的物理和机械性能比较研究
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119725
Aircraft designers have been looking for light-weight and robustness from natural fibers since the earlier times. To address this concern, scientists are currently working together on the bamboo long fiber reinforced bio-based matrix composite (BAMCO) project. This study focused on Bambusa vulgaris, a dominant bamboo species in Cameroon, to evaluate its potential for use in airline industries. The aim of the study is to determine the age at which Bambusa vulgaris fibers have the best mechanical and thermal properties for the manufacture of hybrid composites applied to aeronautics and aerospace. B. vulgaris plants aged 1–3 years, 4–5 years and 7 years were characterized, by submitting specimens to several tests: 1) density measurement, 2) tensile tests, 3) scanning electron microscopy (SEM), 4) Fourier-transform infrared spectroscopy (FTIR), 5) thermal conductivity, 6) thermogravimetric analysis (TGA), 7) specific heat capacity measurement, 8) dynamic mechanical analysis (DMA), and 9) ILSS test. A comparative study of the properties of other natural fiber tested in the aeronautic and aerospace industries revealed that, 7-year-old B. vulgaris has good properties for the airline industry. This study provides evidence that a 7-year-old B. vulgaris plant has a potentially important role in aeronautical and aerospace composite materials.
自古以来,飞机设计师们就一直在追求天然纤维的轻质和坚固。为了解决这一问题,科学家们目前正在合作开展竹长纤维增强生物基复合材料(BAMCO)项目。这项研究的重点是喀麦隆的主要竹种簕竹,以评估其在航空工业中的应用潜力。研究的目的是确定簕竹纤维在哪个年龄段具有最佳的机械和热性能,以制造应用于航空和航天领域的混合复合材料。研究人员对 1-3年、4-5年和7年的簕杜鹃植株进行了特征描述,并对样本进行了多项测试:1) 密度测定;2) 拉伸测试;3) 扫描电子显微镜 (SEM);4) 傅立叶变换红外光谱 (FTIR);5) 热导率;6) 热重分析 (TGA);7) 比热容测量;8) 动态机械分析 (DMA) 和 9) ILSS 测试。对航空和航天工业中测试过的其他天然纤维的特性进行比较研究后发现,7 年树龄的 B. vulgaris 在航空工业中具有良好的特性。这项研究提供了证据,证明 7 年生的褐藻榕植物在航空航天复合材料中具有潜在的重要作用。
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引用次数: 0
Flame-retardant mechanism and mechanical property of flame-retardant corn straw brick (FRCSB) 阻燃玉米秸秆砖(FRCSB)的阻燃机理和力学性能
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119852
In this paper, the pyrolysis characteristics of flame-retardant corn straw brick (FRCSB) and the changes in weights, dimensions, colors, mechanical properties, and micromorphology after high temperature treatment were studied. The results indicate that FRCSB demonstrates excellent flame retardancy. The evaporation process of water in FRCSB is delayed, completing only at a heat treatment temperature of 300°C, whereas the evaporation processes for Ca(OH)2 and corn straw fiber are completed at 200°C and 100°C, respectively. The decomposition process of corn straw fiber and Ca(OH)2 in FRCSB is also delayed and slowed compared to their individual decomposition rates. This delay occurs because the calcium carbonate (CaCO3) formed from the reaction between Ca(OH)2 and CO2 creates a barrier on the surface of FRCSB, preventing heat exchange. The observed changes in color and weight of FRCSB during heat treatment support these findings. Furthermore, a specific range of heat treatment reduces the moisture content of FRCSB and increases its compressive strength up to 18.86 MPa at 200 °C. However, the compressive strength decreases rapidly due to the decomposition of corn straw fiber within FRCSB. Therefore, the key to enhancing the mechanical properties of FRCSB at high temperatures lies in preventing the decomposition of corn straw fiber in the brick. The strongly alkaline environment provided by Ca(OH)2 allows corn straw fiber to retain its properties during heat treatment, thereby improving the performance of FRCSB by serving as a support and connector.
本文研究了阻燃玉米秸秆砖(FRCSB)的热解特性以及高温处理后重量、尺寸、颜色、机械性能和微观形态的变化。结果表明,FRCSB 具有优异的阻燃性。FRCSB 中水分的蒸发过程是延迟的,仅在热处理温度达到 300°C 时才完成,而 Ca(OH)2 和玉米秸秆纤维的蒸发过程分别在 200°C 和 100°C 时完成。FRCSB 中玉米秸秆纤维和 Ca(OH)2 的分解过程与它们各自的分解速度相比也有所延迟和减缓。出现这种延迟的原因是 Ca(OH)2 和 CO2 反应生成的碳酸钙(CaCO3)在 FRCSB 表面形成了一层屏障,阻碍了热交换。在热处理过程中观察到的 FRCSB 颜色和重量的变化证实了上述结论。此外,特定范围的热处理可降低 FRCSB 的水分含量,并提高其抗压强度,在 200 °C 时最高可达 18.86 兆帕。然而,由于 FRCSB 中玉米秸秆纤维的分解,抗压强度迅速降低。因此,在高温条件下提高 FRCSB 机械性能的关键在于防止玉米秸秆纤维在砖中分解。Ca(OH)2 提供的强碱性环境可使玉米秸秆纤维在热处理过程中保持其特性,从而通过充当支撑和连接体提高 FRCSB 的性能。
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引用次数: 0
Fabrication and characterization of a novel superhydrophobic cotton fabric with integrated 3D graphene-Ag/TiO2 aerogel for superior antibacterial performance, oil-water separation, and enhanced durability 制作和表征集成了三维石墨烯-Ag/二氧化钛气凝胶的新型超疏水性棉织物,以实现卓越的抗菌性能、油水分离和更高的耐用性
IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2024-10-19 DOI: 10.1016/j.indcrop.2024.119882
This research delineates the pioneering development of a superhydrophobic cotton textile, ingeniously integrated with a three-dimensional graphene-Ag/TiO2 aerogel. The study meticulously details the fabrication process, structural characterization, and diverse industrial applications of this advanced textile. The fabric demonstrates exceptional hydrophobicity, evidenced by a water contact angle (WCA) of 161.8°. Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD), Raman spectra, and Fourier Transform Infrared Spectroscopy (FTIR) substantiate the micromorphological and chemical alterations of the cotton surface, highlighting the successful reduction of graphene oxide (GO) and incorporation of polydimethylsiloxane (PDMS), TiO2, and Ag nanoparticles. The fabric’s antibacterial efficacy is rigorously established, boasting an impressive antibacterial rate that surpasses 99.99 % against E. coli and S. aureus. Additionally, the fabric demonstrates its capability to discern between oil and water with remarkable finesse, showcasing a separation efficiency that exceeds 98 %, even under extreme chemical conditions. The textile also exhibits excellent self-cleaning, washing, and chemical durability, alongside robust antistatic properties. Despite a marginal decrease in air permeability relative to raw cotton, the fabric’s multifunctional capabilities significantly compensate for this trade-off. The unique three-dimensional architecture of the hybrid graphene-Ag/TiO2 aerogel (AT-HGA) modified cotton marks a substantial advancement in bio-based material science, with broad potential applications in functional garments, medical textiles, and various industrial sectors.
这项研究描述了超疏水棉纺织品的开创性开发,它巧妙地与三维石墨烯-Ag/二氧化钛气凝胶融为一体。研究详细介绍了这种先进纺织品的制造工艺、结构特征和多种工业应用。织物具有优异的疏水性,水接触角(WCA)达到 161.8°。扫描电子显微镜 (SEM)、X 射线光电子能谱 (XPS)、X 射线衍射 (XRD)、拉曼光谱和傅立叶变换红外光谱 (FTIR) 证实了棉表面的微观形态和化学变化,突出显示了氧化石墨烯 (GO) 的成功还原以及聚二甲基硅氧烷 (PDMS)、二氧化钛 (TiO2) 和银纳米粒子的加入。织物的抗菌功效已得到严格证实,对大肠杆菌和金黄色葡萄球菌的抗菌率超过 99.99%,令人印象深刻。此外,这种织物还具有出色的油水鉴别能力,即使在极端的化学条件下,其分离效率也超过 98%。这种织物还具有出色的自洁、洗涤和化学耐久性,以及强大的抗静电性能。尽管与原棉相比,这种织物的透气性略有下降,但其多功能性大大弥补了这一不足。石墨烯-Ag/TiO2 混合气凝胶(AT-HGA)改性棉的独特三维结构标志着生物基材料科学的重大进步,在功能性服装、医用纺织品和各种工业领域具有广泛的应用潜力。
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Industrial Crops and Products
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