Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.91
Sijie Zhuang, W. Lv, Jingxian Zhang, Z. Long, Chang Sun, Xuefeng Lu, Shuangfei Wang
In this paper, we report a method for the preparation of liner paper applied on liquid crystal glass. It was obtained by wet forming of hardwood fiber and a laboratory-made hydrophilic dispersible polyester staple fiber in a certain proportion. The laboratory-made hydrophilic dispersible polyester staple fiber was obtained by co-deposition of gallic acid and ethylenediamine on PET fiber. Some additives were used in the papermaking process, including wet strength agent polyamide epichlorohydrin (PAE), anti-mildew and antibacterial agent polyhexamethylene biguanide (PHMB), and pH adjuster boric acid (H3BO3). Results showed that the liner paper has high air permeability (~35.99 μm.(Pa∙s)-1), good wet strength (~0.720 kN.m-1) and excellent anti-mildew and antibacterial properties. Interestingly, the pore size of the modified PET fiber paper increased between 23% and 29% within the same pore size range compared with PET fiber paper. This provides a theoretical basis for the relationship between paper pore size and air permeability.
{"title":"LINER PAPER WITH HIGH AIR PERMEABILITY, HIGH WET STRENGTH, ANTI-MILDEW AND ANTIBACTERIAL PROPERTIES FOR LIQUID CRYSTAL GLASS","authors":"Sijie Zhuang, W. Lv, Jingxian Zhang, Z. Long, Chang Sun, Xuefeng Lu, Shuangfei Wang","doi":"10.35812/cellulosechemtechnol.2022.56.91","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.91","url":null,"abstract":"In this paper, we report a method for the preparation of liner paper applied on liquid crystal glass. It was obtained by wet forming of hardwood fiber and a laboratory-made hydrophilic dispersible polyester staple fiber in a certain proportion. The laboratory-made hydrophilic dispersible polyester staple fiber was obtained by co-deposition of gallic acid and ethylenediamine on PET fiber. Some additives were used in the papermaking process, including wet strength agent polyamide epichlorohydrin (PAE), anti-mildew and antibacterial agent polyhexamethylene biguanide (PHMB), and pH adjuster boric acid (H3BO3). Results showed that the liner paper has high air permeability (~35.99 μm.(Pa∙s)-1), good wet strength (~0.720 kN.m-1) and excellent anti-mildew and antibacterial properties. Interestingly, the pore size of the modified PET fiber paper increased between 23% and 29% within the same pore size range compared with PET fiber paper. This provides a theoretical basis for the relationship between paper pore size and air permeability.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45758434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.90
Milica Galić, M. Stajić, Jasmina Ćilerdžić
The main goal of this study was to analyze the potential of Trichoderma viride BEOFB 1210m for cellulase production during solid-state fermentation of wheat straw pretreated with the ligninosome of a well-known white-rot delignificator – Pleurotus pulmonarius HAI 573. After only 7 days of T. viridae BEOFB 1210m cultivation on biologically pretreated wheat straw, this micromycete produced the most active xylanases, which were also the dominant enzymes, with a value of even 3730.10 U L-1. Likewise, maximal but much lower values of exocellulases (155.83 U L-1) and β-glucosidases (59.98 U L-1) were detected after the same period of fermentation. However, much higher activity of endocellulase (2439.55 U L-1) was obtained on the 10th day. The dynamics of enzyme activity was reflected on the level of substrate depolymerization. As much as 30.56% of the cellulose was degraded already on the 7th day, and that percentage did not change significantly until the end of the cultivation period. A significant loss of hemicelluloses was also measured at the beginning of the fermentation process, but it reached a maximum of approximately 50% by the 21st day. The results clearly showed that the selected T. viride strain has very good potential to synthesize highly active cellulases when grown on a cheap and available substrate, which is significant for further large-scale industrial applications.
本研究的主要目的是分析绿色木霉BEOFB 1210m在用著名白腐脱木素菌——肺菇HAI 573的木质素体预处理的麦草固态发酵过程中产生纤维素酶的潜力。在经过生物预处理的小麦秸秆上仅培养7天的T.viridae BEOFB 1210m后，这种微酵母产生了最具活性的木聚糖酶，木聚糖酶也是主要的酶，甚至达到3730.10U L-1。同样，在相同的发酵期后，检测到胞外纤维素酶（155.83 U L-1）和β-葡萄糖苷酶（59.98 U L-1。然而，在第10天获得了更高的内纤维素酶活性（2439.55U L-1）。酶活性的动态反映在底物解聚的水平上。在第7天，多达30.56%的纤维素已经降解，并且直到培养期结束，这一百分比才发生显著变化。在发酵过程开始时也测量到半纤维素的显著损失，但到第21天达到最大约50%。研究结果清楚地表明，所选的绿色T.viride菌株在廉价可用的底物上生长时，具有合成高活性纤维素酶的良好潜力，这对进一步的大规模工业应用具有重要意义。
{"title":"DYNAMICS OF PRETREATED WHEAT STRAW SACCHARIFICATION BY CELLULOSOME OF Trichoderma viride","authors":"Milica Galić, M. Stajić, Jasmina Ćilerdžić","doi":"10.35812/cellulosechemtechnol.2022.56.90","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.90","url":null,"abstract":"The main goal of this study was to analyze the potential of Trichoderma viride BEOFB 1210m for cellulase production during solid-state fermentation of wheat straw pretreated with the ligninosome of a well-known white-rot delignificator – Pleurotus pulmonarius HAI 573. After only 7 days of T. viridae BEOFB 1210m cultivation on biologically pretreated wheat straw, this micromycete produced the most active xylanases, which were also the dominant enzymes, with a value of even 3730.10 U L-1. Likewise, maximal but much lower values of exocellulases (155.83 U L-1) and β-glucosidases (59.98 U L-1) were detected after the same period of fermentation. However, much higher activity of endocellulase (2439.55 U L-1) was obtained on the 10th day. The dynamics of enzyme activity was reflected on the level of substrate depolymerization. As much as 30.56% of the cellulose was degraded already on the 7th day, and that percentage did not change significantly until the end of the cultivation period. A significant loss of hemicelluloses was also measured at the beginning of the fermentation process, but it reached a maximum of approximately 50% by the 21st day. The results clearly showed that the selected T. viride strain has very good potential to synthesize highly active cellulases when grown on a cheap and available substrate, which is significant for further large-scale industrial applications.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44260864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.98
D. Zioui, L. Aoudjit, F. Touahra, K. Bacharı
The aim of this work was to synthesize nanocomposite membranes based on chitosan (CS) biopolymer containing TiO2 nanoparticles (TiO2-Chitosan). The developed membranes were fully featured using different characterization techniques (SEM, TGA, XRD, FTIR and contact angle measurement). The photocatalytic activity of the fabricated membranes was evaluated by performing experiments in which aqueous solutions of tartrazine dye that contained the fabricated membrane were irradiated with solar light. The photodegradation percentage was spectrophotometrically determined by monitoring the maximum wavelengths (λmax) of tartrazine at 427 nm for different irradiation times. The decolourisation percentage of the dye under solar light was 83% using the TiO2-Chitosan membrane. The effective reusability and stability of the produced nanocomposite (TiO2-Chitosan) films was also assessed. After four use cycles, this efficiency remained practically constant, demonstrating the membranes’ reusability and suitability for catalytic activity in tartrazine removal from water.
{"title":"\"PREPARATION AND CHARACTERIZATION OF TiO2-CHITOSAN COMPOSITE FILMS AND APPLICATION FOR TARTRAZINE DYE DEGRADATION \"","authors":"D. Zioui, L. Aoudjit, F. Touahra, K. Bacharı","doi":"10.35812/cellulosechemtechnol.2022.56.98","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.98","url":null,"abstract":"The aim of this work was to synthesize nanocomposite membranes based on chitosan (CS) biopolymer containing TiO2 nanoparticles (TiO2-Chitosan). The developed membranes were fully featured using different characterization techniques (SEM, TGA, XRD, FTIR and contact angle measurement). The photocatalytic activity of the fabricated membranes was evaluated by performing experiments in which aqueous solutions of tartrazine dye that contained the fabricated membrane were irradiated with solar light. The photodegradation percentage was spectrophotometrically determined by monitoring the maximum wavelengths (λmax) of tartrazine at 427 nm for different irradiation times. The decolourisation percentage of the dye under solar light was 83% using the TiO2-Chitosan membrane. The effective reusability and stability of the produced nanocomposite (TiO2-Chitosan) films was also assessed. After four use cycles, this efficiency remained practically constant, demonstrating the membranes’ reusability and suitability for catalytic activity in tartrazine removal from water.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46300996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.92
Mustafa Çiçekler
The main objective of this study is to determine the effects of different ratios of starch-containing AKD emulsion in various pulp types sizing processes on paper properties. A secondary objective of the study is to evaluate the influences of starch content in AKD emulsion and AKD dosage applied to pulps. Three different pulp types were sized: unbleached kraft, bleached kraft and chemithermomechanical pulps. In preparation of AKD emulsions, three different ratios of starch were used. AKD was applied to all pulps under the same conditions at four different dosages based on oven-dried fiber weight. Test papers were produced and Cobb values (water absorptiveness), some mechanical and optical properties of the papers were determined. In addition, SEM, XRD and contact angle analyses were applied to papers produced with optimal sizing parameters. As a result of the study, it was found that the effects of AKD cause different behaviors depending on the pulp types. AKD was highly efficient in sizing chemithermomechanical pulp, decreasing the Cobb value by 90.9%. Depending on the pulp type, the starch content used in the emulsion preparation and the AKD dosage applied to the papers have various effects on the paper properties.
{"title":"\"EFFECTS OF DIFFERENT RATIOS OF STARCH-CONTAINING AKD ON PAPER PROPERTIES IN INTERNAL SIZING OF VARIOUS PULP TYPES \"","authors":"Mustafa Çiçekler","doi":"10.35812/cellulosechemtechnol.2022.56.92","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.92","url":null,"abstract":"The main objective of this study is to determine the effects of different ratios of starch-containing AKD emulsion in various pulp types sizing processes on paper properties. A secondary objective of the study is to evaluate the influences of starch content in AKD emulsion and AKD dosage applied to pulps. Three different pulp types were sized: unbleached kraft, bleached kraft and chemithermomechanical pulps. In preparation of AKD emulsions, three different ratios of starch were used. AKD was applied to all pulps under the same conditions at four different dosages based on oven-dried fiber weight. Test papers were produced and Cobb values (water absorptiveness), some mechanical and optical properties of the papers were determined. In addition, SEM, XRD and contact angle analyses were applied to papers produced with optimal sizing parameters. As a result of the study, it was found that the effects of AKD cause different behaviors depending on the pulp types. AKD was highly efficient in sizing chemithermomechanical pulp, decreasing the Cobb value by 90.9%. Depending on the pulp type, the starch content used in the emulsion preparation and the AKD dosage applied to the papers have various effects on the paper properties.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42368559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.83
F. Adebawo, O. Y. Ogunsanwo, O. Adegoke, L. Lucia
Acetylation is a well-established process to improve dimensional properties of wood and resistance to fungi attack. This study was carried out due to limited studies on the effect of acetylation on mechanical properties, thermal stability, and microstructural aspects of wood. Wood blocks, (each 20×20×60 mm) of Obeche wood were acetylated with acetic anhydride at 120 °C for 60, 120, 180, 240 and 300 minutes. The microstructure and thermal stability of acetylated and unmodified wood blocks were assessed using SEM and TGA, respectively. The maximum compressive strength (MCS//g) and modulus of elasticity (MOE) of the wood specimens were also determined. The SEM indicated no visible damage or defect in the microstructure of all the acetylated wood and no significant differences in the strength properties compared to untreated wood. Acetylated wood showed an increased thermal stability compared to unmodified wood.
{"title":"\"STRENGTH PROPERTIES, THERMAL STABILITY AND MICROSTRUCTURE OF ACETYLATED OBECHE (Triplochiton scleroxylon K. SCHUM) WOOD \"","authors":"F. Adebawo, O. Y. Ogunsanwo, O. Adegoke, L. Lucia","doi":"10.35812/cellulosechemtechnol.2022.56.83","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.83","url":null,"abstract":"Acetylation is a well-established process to improve dimensional properties of wood and resistance to fungi attack. This study was carried out due to limited studies on the effect of acetylation on mechanical properties, thermal stability, and microstructural aspects of wood. Wood blocks, (each 20×20×60 mm) of Obeche wood were acetylated with acetic anhydride at 120 °C for 60, 120, 180, 240 and 300 minutes. The microstructure and thermal stability of acetylated and unmodified wood blocks were assessed using SEM and TGA, respectively. The maximum compressive strength (MCS//g) and modulus of elasticity (MOE) of the wood specimens were also determined. The SEM indicated no visible damage or defect in the microstructure of all the acetylated wood and no significant differences in the strength properties compared to untreated wood. Acetylated wood showed an increased thermal stability compared to unmodified wood.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41267378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.81
Aryanny Nasir, N. Adrus, S. Bohari
Rice husk (RH) is the by-product of the rice milling industry, and its primary disposal via burning can lead to detrimental environmental implications. While literature primarily focused on the potential of its silica component, the cellulosic constituent, which can be of applied value in the biomedical field, appears sparsely reported. Therefore, this review paper critically discusses both the silica and cellulose components of RH investigated for various biomedical uses (adsorbents, drug delivery systems, antioxidant and antitumor activities), and provides the elaborative overview of the chemical extraction methods for both components, while highlighting the needs for optimizing the extraction process for large scale industrial considerations. Discussions on several limitations of the current knowledge that mitigated readiness for biomedical applications (e.g. inadequate data from animal studies and clinical trials, as well as the lack of analytical confirmatory tests and non-standardized methods) are also presented. Considering the medicinal properties of RH, the possible utilization of its cellulose content as a new biomaterial for wound healing application is theorized. The information gathered here justifies the use of this agricultural biomass as a new source of economic wealth for biomedical industries, while minimizing the environmental threat that can be associated with its disposal.
{"title":"RICE HUSK AS POTENTIAL RESOURCE FOR BIOMEDICAL APPLICATIONS: A REVIEW","authors":"Aryanny Nasir, N. Adrus, S. Bohari","doi":"10.35812/cellulosechemtechnol.2022.56.81","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.81","url":null,"abstract":"Rice husk (RH) is the by-product of the rice milling industry, and its primary disposal via burning can lead to detrimental environmental implications. While literature primarily focused on the potential of its silica component, the cellulosic constituent, which can be of applied value in the biomedical field, appears sparsely reported. Therefore, this review paper critically discusses both the silica and cellulose components of RH investigated for various biomedical uses (adsorbents, drug delivery systems, antioxidant and antitumor activities), and provides the elaborative overview of the chemical extraction methods for both components, while highlighting the needs for optimizing the extraction process for large scale industrial considerations. Discussions on several limitations of the current knowledge that mitigated readiness for biomedical applications (e.g. inadequate data from animal studies and clinical trials, as well as the lack of analytical confirmatory tests and non-standardized methods) are also presented. Considering the medicinal properties of RH, the possible utilization of its cellulose content as a new biomaterial for wound healing application is theorized. The information gathered here justifies the use of this agricultural biomass as a new source of economic wealth for biomedical industries, while minimizing the environmental threat that can be associated with its disposal.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48796510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.86
Arshad Ali, M. Haseeb, M. A. Hussain, M. Tayyab, Gulzar Muhammad, N. Ahmad, N. F. Alotaibi, S. Hussain, I. Hussain
Herein, we optimized eco-friendly extraction parameters to get the maximum yield of a novel polysaccharide-based mucilage (SSH) from seeds of Salvia spinosa. The dependency of the extraction yield of SSH on the pH of the extraction medium (pH 6-8), extraction temperature (25-75 °C), seed/water ratio (1:10-1:40 w/v), and seed–water contact time (1-4 h) was evaluated using response surface methodology–Box Behnken design (RSM–BBD). A second-order polynomial equation provided the best fit to the studied response with p < 0.0001. The optimum conditions to achieve the maximum yield of SSH (7.35%) were at pH 7, extraction temperature of 50 °C, seed/water ratio of 1:25 w/v, and seed–water contact time of 2.5 h. Scanning electron microscopic analysis of SSH revealed its superporous nature.
{"title":"EXTRACTION OPTIMIZATION OF A SUPERPOROUS POLYSACCHARIDE-BASED MUCILAGE FROM Salvia spinosa L.","authors":"Arshad Ali, M. Haseeb, M. A. Hussain, M. Tayyab, Gulzar Muhammad, N. Ahmad, N. F. Alotaibi, S. Hussain, I. Hussain","doi":"10.35812/cellulosechemtechnol.2022.56.86","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.86","url":null,"abstract":"Herein, we optimized eco-friendly extraction parameters to get the maximum yield of a novel polysaccharide-based mucilage (SSH) from seeds of Salvia spinosa. The dependency of the extraction yield of SSH on the pH of the extraction medium (pH 6-8), extraction temperature (25-75 °C), seed/water ratio (1:10-1:40 w/v), and seed–water contact time (1-4 h) was evaluated using response surface methodology–Box Behnken design (RSM–BBD). A second-order polynomial equation provided the best fit to the studied response with p < 0.0001. The optimum conditions to achieve the maximum yield of SSH (7.35%) were at pH 7, extraction temperature of 50 °C, seed/water ratio of 1:25 w/v, and seed–water contact time of 2.5 h. Scanning electron microscopic analysis of SSH revealed its superporous nature.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48333517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.88
Noura Y. Elmehbad, Nadia A. Mohamed, Nahed A. Abd El‐Ghany, M. Abdel-Aziz
A crosslinked sodium alginate (SA)/carboxymethyl xanthan gum (CMXG) hydrogel was prepared by blending an equivalent weight ratio of SA and CMXG, followed by crosslinking using CaCl2. Moreover, two nanocomposites were prepared by in situ dispersion of two different concentrations of silver nanoparticles (AgNPs) into the matrix of the prepared hydrogel. The analysis displayed that the order of COX-2 inhibition by the tested samples was SA ˂ CMXG ˂ crosslinked SA/CMXG hydrogel ˂ SA/CMXG/AgNPs1% ˂ SA/CMXG/AgNPs3% ˂ Celecoxib. AgNP composites exhibited a potent inhibition tendency, and their activity increased with increasing the AgNPs content. The recorded MIC values revealed that the MIC values that cause 50% inhibition (IC50) of COX-2 enzyme activity were 14.2 and 3.6 µg/mL for SA/CMXG/AgNPs1% and SA/CMXG/AgNPs3%, respectively, corresponding to 0.28 µg/mL for the standard drug Celecoxib. Moreover, SA/CMXG/AgNPs composites showed a greater inhibition efficiency of H. pylori than their parent SA/CMXG hydrogel. Their inhibitory efficiency increased with increasing their AgNPs content; SA/CMXG/AgNPs1% and SA/CMXG/AgNPs3% exhibited 100% inhibition against H. pylori growth at MIC of 3.9 and 1.95 µg/mL, respectively. The anti-H. pylori activity of SA/CMXG/AgNPs 3% was higher than that of the standard drug Clarithromycin, especially at the low concentrations ranging from 0.24 to 0.98 µg/mL. These results make SA/CMXG/AgNPs3% a promising anti-H. pylori agent.
{"title":"\"GREEN SYNTHESIS OF NANO-SILVER/SODIUM ALGINATE/CARBOXYMETHYL XANTHAN GUM HYDROGEL AND EVALUATION OF ITS ANTI-INFLAMMATORY AND ANTI-Helicobacter pylori ACTIVITY \"","authors":"Noura Y. Elmehbad, Nadia A. Mohamed, Nahed A. Abd El‐Ghany, M. Abdel-Aziz","doi":"10.35812/cellulosechemtechnol.2022.56.88","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.88","url":null,"abstract":"A crosslinked sodium alginate (SA)/carboxymethyl xanthan gum (CMXG) hydrogel was prepared by blending an equivalent weight ratio of SA and CMXG, followed by crosslinking using CaCl2. Moreover, two nanocomposites were prepared by in situ dispersion of two different concentrations of silver nanoparticles (AgNPs) into the matrix of the prepared hydrogel. The analysis displayed that the order of COX-2 inhibition by the tested samples was SA ˂ CMXG ˂ crosslinked SA/CMXG hydrogel ˂ SA/CMXG/AgNPs1% ˂ SA/CMXG/AgNPs3% ˂ Celecoxib. AgNP composites exhibited a potent inhibition tendency, and their activity increased with increasing the AgNPs content. The recorded MIC values revealed that the MIC values that cause 50% inhibition (IC50) of COX-2 enzyme activity were 14.2 and 3.6 µg/mL for SA/CMXG/AgNPs1% and SA/CMXG/AgNPs3%, respectively, corresponding to 0.28 µg/mL for the standard drug Celecoxib. Moreover, SA/CMXG/AgNPs composites showed a greater inhibition efficiency of H. pylori than their parent SA/CMXG hydrogel. Their inhibitory efficiency increased with increasing their AgNPs content; SA/CMXG/AgNPs1% and SA/CMXG/AgNPs3% exhibited 100% inhibition against H. pylori growth at MIC of 3.9 and 1.95 µg/mL, respectively. The anti-H. pylori activity of SA/CMXG/AgNPs 3% was higher than that of the standard drug Clarithromycin, especially at the low concentrations ranging from 0.24 to 0.98 µg/mL. These results make SA/CMXG/AgNPs3% a promising anti-H. pylori agent.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45502144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.97
Münevver Ertek Avcı, O. Demiryurek
This study aims to develop and characterize more sustainable and ecological yarns as an alternative to 100% cotton in traditional denim fabric production by using hemp fiber. For this purpose, conventional ring, core-spun and dual core-spun yarns were spun from three blend proportions of organic cotton/hemp fibers as 100:0, 80:20 and 70:30 in percentages. Hemp and organic cotton were used as sheath fiber, and elastane type (Lycra and T400) – as core fiber in the yarn structures. According to the results, the sheath fiber type and blend ratio greatly influenced all yarns’ physical characteristics. Using hemp fiber in the yarn structure generally decreased the yarn properties, as expected. However, the best results by using hemp fiber in the yarn structures were achieved by using 20% hemp fiber in the sheath of the yarn structure. Further increasing this rate to 30% worsened the yarn properties considerably, regardless of the core component. When the yarns were evaluated in terms of sustainability and performance, 80/20% organic cotton/hemp blended yarns had the optimum yarn properties.
{"title":"DEVELOPMENT OF SUSTAINABLE AND ECOLOGICAL HYBRID YARNS: HEMP FIBER IN DENIM FABRIC PRODUCTION","authors":"Münevver Ertek Avcı, O. Demiryurek","doi":"10.35812/cellulosechemtechnol.2022.56.97","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.97","url":null,"abstract":"This study aims to develop and characterize more sustainable and ecological yarns as an alternative to 100% cotton in traditional denim fabric production by using hemp fiber. For this purpose, conventional ring, core-spun and dual core-spun yarns were spun from three blend proportions of organic cotton/hemp fibers as 100:0, 80:20 and 70:30 in percentages. Hemp and organic cotton were used as sheath fiber, and elastane type (Lycra and T400) – as core fiber in the yarn structures. According to the results, the sheath fiber type and blend ratio greatly influenced all yarns’ physical characteristics. Using hemp fiber in the yarn structure generally decreased the yarn properties, as expected. However, the best results by using hemp fiber in the yarn structures were achieved by using 20% hemp fiber in the sheath of the yarn structure. Further increasing this rate to 30% worsened the yarn properties considerably, regardless of the core component. When the yarns were evaluated in terms of sustainability and performance, 80/20% organic cotton/hemp blended yarns had the optimum yarn properties.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44815585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.84
A. J. V. Zanuncio, Emanuel Arnoni Costa, A. G. Carvalho, V. R. de Castro, Angélica DE CASSIA OLIVEIRA CARNEIRO, Solange de Oliveira Araújo
Colorimetric evaluation is practical, accurate and fast. Starting from the generally established fact that a heat treatment changes the wood properties, the present paper aimed to predict the properties of heat-treated wood by using colorimetry and artificial neural networks (ANNs). Eucalyptus grandis and Pinus caribaea wood samples were heat-treated to evaluate their color, as well as physical and mechanical properties. The relationship between the wood color and its physical and mechanical properties was evaluated through multilayer perceptron (MLP) neural network. The heat treatment darkened the wood, increased its dimensional stability and reduced its mechanical resistance. Artificial neural networks based on colorimetric and temperature parameters were efficient in modeling the wood properties, with better results to predict its physical parameters. The coefficient of determination (R2) of the models was high and the root mean squared error (RMSE%) low – with homogeneous distribution. The findings suggest that colorimetry is adequate as a non-destructive tool to evaluate heat-treated wood.
{"title":"ARTIFICIAL INTELLIGENCE AND COLORIMETRY AS A COMBINED NON-DESTRUCTIVE METHOD TO PREDICT PROPERTIES OF HEAT-TREATED WOOD","authors":"A. J. V. Zanuncio, Emanuel Arnoni Costa, A. G. Carvalho, V. R. de Castro, Angélica DE CASSIA OLIVEIRA CARNEIRO, Solange de Oliveira Araújo","doi":"10.35812/cellulosechemtechnol.2022.56.84","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.84","url":null,"abstract":"Colorimetric evaluation is practical, accurate and fast. Starting from the generally established fact that a heat treatment changes the wood properties, the present paper aimed to predict the properties of heat-treated wood by using colorimetry and artificial neural networks (ANNs). Eucalyptus grandis and Pinus caribaea wood samples were heat-treated to evaluate their color, as well as physical and mechanical properties. The relationship between the wood color and its physical and mechanical properties was evaluated through multilayer perceptron (MLP) neural network. The heat treatment darkened the wood, increased its dimensional stability and reduced its mechanical resistance. Artificial neural networks based on colorimetric and temperature parameters were efficient in modeling the wood properties, with better results to predict its physical parameters. The coefficient of determination (R2) of the models was high and the root mean squared error (RMSE%) low – with homogeneous distribution. The findings suggest that colorimetry is adequate as a non-destructive tool to evaluate heat-treated wood.","PeriodicalId":10130,"journal":{"name":"Cellulose Chemistry and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44302328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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