Pub Date : 2022-11-29DOI: 10.35812/cellulosechemtechnol.2022.56.82
B. Lönnberg
"Data by Riissanen were largely applied to learn more about wood grinding and, particularly, possible effects of the moisture content in spruce wood, varying from 65 to 15%, which in terms of moisture ratio covers a range from 1.9 to 0.2 kg water per kg oven dry wood. Tensile index (TI) and light scattering coefficient (LSC) of the pulp sheets were tested corresponding to various wood moisture contents, when the wood samples were ground to pulp by application of 20 and 30 m/s stone surface speeds and 0.7, 1.0 and 1.3 mm/s wood feed rates, respectively. The fines quantity of the screened pulp was related to the shives quantity that was screened off before testing, and accordingly these data were imitating some relevant grinding conditions. Fines were considered indicative of the fibrillation, as shives were indicative of the average fibre length. The respective TI and LSC values were correlated to the fines content–to–shives ratio for some useful results. The highest TI were obtained with fully water impregnated spruce wood (65% MC) by application of 30 m/s stone surface speed, and the lowest with air-dry wood (15% MC) and 30 m/s as well. Fresh spruce wood (58% MC) resulted in a similar trend as obtained with fully water impregnated wood, but on a lower level. Slightly dried spruce wood (44% MC) showed a further lower level, but surprisingly 30 m/s resulted in lower TI values than 20 m/s stone speed. Spruce wood with water saturated fiber walls (28% MC) appeared to react strongly to 20 m/s, but not to 30 m/s stone surface speed. The LSC values appeared quite contrary to the TI values, i.e. the highest LSC values were obtained by grinding the air-dry spruce wood (15% MC), while the fully water impregnated wood (65% MC) again gave the lowest LSC, when grinding at 20 m/s stone surface speed. "
{"title":"\"DEVELOPMENT OF WOOD GRINDING 5. FINES CONTENT–TO–SHIVES RATIO \"","authors":"B. Lönnberg","doi":"10.35812/cellulosechemtechnol.2022.56.82","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.82","url":null,"abstract":"\"Data by Riissanen were largely applied to learn more about wood grinding and, particularly, possible effects of the moisture content in spruce wood, varying from 65 to 15%, which in terms of moisture ratio covers a range from 1.9 to 0.2 kg water per kg oven dry wood. Tensile index (TI) and light scattering coefficient (LSC) of the pulp sheets were tested corresponding to various wood moisture contents, when the wood samples were ground to pulp by application of 20 and 30 m/s stone surface speeds and 0.7, 1.0 and 1.3 mm/s wood feed rates, respectively. The fines quantity of the screened pulp was related to the shives quantity that was screened off before testing, and accordingly these data were imitating some relevant grinding conditions. Fines were considered indicative of the fibrillation, as shives were indicative of the average fibre length. The respective TI and LSC values were correlated to the fines content–to–shives ratio for some useful results. The highest TI were obtained with fully water impregnated spruce wood (65% MC) by application of 30 m/s stone surface speed, and the lowest with air-dry wood (15% MC) and 30 m/s as well. Fresh spruce wood (58% MC) resulted in a similar trend as obtained with fully water impregnated wood, but on a lower level. Slightly dried spruce wood (44% MC) showed a further lower level, but surprisingly 30 m/s resulted in lower TI values than 20 m/s stone speed. Spruce wood with water saturated fiber walls (28% MC) appeared to react strongly to 20 m/s, but not to 30 m/s stone surface speed. The LSC values appeared quite contrary to the TI values, i.e. the highest LSC values were obtained by grinding the air-dry spruce wood (15% MC), while the fully water impregnated wood (65% MC) again gave the lowest LSC, when grinding at 20 m/s stone surface speed. \"","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":"45405306","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.2022.56.96
Yakout Addour, Azzedine Benyahia, N. Laib, Nadir Deghfel
Environmental and energy conservation pressure has led to a dramatic increase in the need for economically feasible lightweight materials that can be better substituted for non-biodegradable materials in reinforced composites. To this end, this study examines composite materials prepared from unsaturated polyester resins reinforced with treated and untreated Alfa fibers. Fiber treatment was carried out by NaOH solution of 5% concentration at different times (1, 3, 5 and 24 h). The strength and flexural modulus of the composites were evaluated according to the ASTM D790 test method. The analytical results indicate that the fibers’ alkaline pretreatment time had a positive influence on the mechanical properties of the composites.
{"title":"\"EFFECT OF ALKALINE TREATMENT TIME ON FLEXURAL PROPERTIES OF ALFA FIBER/UNSATURATED POLYESTER COMPOSITE \"","authors":"Yakout Addour, Azzedine Benyahia, N. Laib, Nadir Deghfel","doi":"10.35812/cellulosechemtechnol.2022.56.96","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.96","url":null,"abstract":"Environmental and energy conservation pressure has led to a dramatic increase in the need for economically feasible lightweight materials that can be better substituted for non-biodegradable materials in reinforced composites. To this end, this study examines composite materials prepared from unsaturated polyester resins reinforced with treated and untreated Alfa fibers. Fiber treatment was carried out by NaOH solution of 5% concentration at different times (1, 3, 5 and 24 h). The strength and flexural modulus of the composites were evaluated according to the ASTM D790 test method. The analytical results indicate that the fibers’ alkaline pretreatment time had a positive influence on the mechanical properties of the composites.","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":"44737677","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.2022.56.93
M. Engin
The COVID-19 pandemic has influenced the demand for products that are considered hygienic, thereby increasing the production rate and variety of hygienic products. Researching new antimicrobial materials is gaining importance with increasing awareness of the topic of infectious diseases caused by various microorganisms. In the present work, cellulosic handsheets were produced and then coated with coatings having different glutaraldehyde concentrations by a roller bar technique. The surface water absorption capacity of the sample groups and their structural and strength characteristics were analyzed. Also, the cross-linking effect of glutaraldehyde was determined by FTIR analysis. The results not only showed that, after being exposed to glutaraldehyde on their surface, the handsheets presented a higher hydrophilic structure and higher tensile strength properties, but also confirmed that coatings containing 1–5% glutaraldehyde lessened fungal activity on their surfaces.
{"title":"AN EXAMINATION OF THE CHARACTERISTICS OF CELLULOSIC HANDSHEETS TREATED WITH GLUTARALDEHYDE","authors":"M. Engin","doi":"10.35812/cellulosechemtechnol.2022.56.93","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.93","url":null,"abstract":"The COVID-19 pandemic has influenced the demand for products that are considered hygienic, thereby increasing the production rate and variety of hygienic products. Researching new antimicrobial materials is gaining importance with increasing awareness of the topic of infectious diseases caused by various microorganisms. In the present work, cellulosic handsheets were produced and then coated with coatings having different glutaraldehyde concentrations by a roller bar technique. The surface water absorption capacity of the sample groups and their structural and strength characteristics were analyzed. Also, the cross-linking effect of glutaraldehyde was determined by FTIR analysis. The results not only showed that, after being exposed to glutaraldehyde on their surface, the handsheets presented a higher hydrophilic structure and higher tensile strength properties, but also confirmed that coatings containing 1–5% glutaraldehyde lessened fungal activity on their surfaces.","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":"46786048","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.2022.56.87
Zhichun Jia, Guang-Jun Guo, Yamin Du, X. Fan, D. Xie, Yanxia Wei, Jian-Ning Zhu, Ji Zhang, Xin-Guo Zhang
Glycyrrhizic acid is the main component of the medicinal plant Glycyrrhiza uralensis Fisch. It is widely used as a sweetener and an effective active ingredient with multiple physiological functions. Endophytes are microorganisms that coexist with plants and can produce cellulase. This cellulase enzyme can be used to overcome dissolution barriers of plant active ingredients by degrading plant cell wall. In the present study, a cellulase-producing strain with high cellulase activity was isolated from fresh Glycyrrhiza uralensis Fisch, and identified using the Congo red staining method and the DNS method. Glycyrrhizic acid yield was determined by the HPLC method. A highly reactive cellulase-producing strain, with a high extraction capacity of glycyrrhizic acid, was obtained. The strain was named GG-3, and bioinformatic analysis showed that it was a Bacillus sp. Findings obtained after optimization of the enzyme production and glycyrrhizic acid extraction process showed that glycyrrhizic acid yield increased by 32.52% and 31.35% after extraction with GG-3 enzyme, compared with the use of the traditional extraction method and commercial cellulase extraction method, respectively.
{"title":"CELLULASE OF ENDOPHYTIC Bacillus SP. FROM Glycyrrhiza uralensis F. AND ITS APPLICATION FOR EXTRACTION OF GLYCYRRHIZIC ACID","authors":"Zhichun Jia, Guang-Jun Guo, Yamin Du, X. Fan, D. Xie, Yanxia Wei, Jian-Ning Zhu, Ji Zhang, Xin-Guo Zhang","doi":"10.35812/cellulosechemtechnol.2022.56.87","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.87","url":null,"abstract":"Glycyrrhizic acid is the main component of the medicinal plant Glycyrrhiza uralensis Fisch. It is widely used as a sweetener and an effective active ingredient with multiple physiological functions. Endophytes are microorganisms that coexist with plants and can produce cellulase. This cellulase enzyme can be used to overcome dissolution barriers of plant active ingredients by degrading plant cell wall. In the present study, a cellulase-producing strain with high cellulase activity was isolated from fresh Glycyrrhiza uralensis Fisch, and identified using the Congo red staining method and the DNS method. Glycyrrhizic acid yield was determined by the HPLC method. A highly reactive cellulase-producing strain, with a high extraction capacity of glycyrrhizic acid, was obtained. The strain was named GG-3, and bioinformatic analysis showed that it was a Bacillus sp. Findings obtained after optimization of the enzyme production and glycyrrhizic acid extraction process showed that glycyrrhizic acid yield increased by 32.52% and 31.35% after extraction with GG-3 enzyme, compared with the use of the traditional extraction method and commercial cellulase extraction method, respectively.","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":"42395722","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.2022.56.85
R. Varma, Arnab Prtihar, Nigariga Pasumpon, S. Vasudevan
The study shows a comparison of cellulose extracted from two species of red seaweeds, namely Hypnea musciformis and Sarconima filliformis. The celluloses were characterized by FTIR, XRD, TGA and SEM analyses. The studies show similarities in the characteristics of the celluloses extracted from H. musciformis and S. filliformis. FTIR analysis confirms the presence of O-H and C-H bonds in the celluloses of both species, while the XRD patterns of celluloses confirm their crystallinity, with a maximum peak at 22°. The thermal stability of the celluloses from H. musciformis and S. filliformis was observed in the range of 250 to 350 °C. The morphological structure of the celluloses was studied using SEM and both celluloses showed smooth pore-free surface.
{"title":"EXTRACTION AND CHARACTERISATION OF CELLULOSE FROM RED SEAWEEDS OF Hypnea musciformis AND Sarconima filliformis","authors":"R. Varma, Arnab Prtihar, Nigariga Pasumpon, S. Vasudevan","doi":"10.35812/cellulosechemtechnol.2022.56.85","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.85","url":null,"abstract":"The study shows a comparison of cellulose extracted from two species of red seaweeds, namely Hypnea musciformis and Sarconima filliformis. The celluloses were characterized by FTIR, XRD, TGA and SEM analyses. The studies show similarities in the characteristics of the celluloses extracted from H. musciformis and S. filliformis. FTIR analysis confirms the presence of O-H and C-H bonds in the celluloses of both species, while the XRD patterns of celluloses confirm their crystallinity, with a maximum peak at 22°. The thermal stability of the celluloses from H. musciformis and S. filliformis was observed in the range of 250 to 350 °C. The morphological structure of the celluloses was studied using SEM and both celluloses showed smooth pore-free surface.","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":"47867704","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.2022.56.99
Hayat Briki, N. Abdellaoui, O. Arous, F. Metref, D. Akretche
In this work, the development of polymeric inclusion membranes for elimination of toxic ions is reported. The effect of a local clay additive on the structure and performances of the membranes was studied. The membrane was made up of cellulose triacetate (CTA) and polysulfone (PSu), plasticized by dioctylphtalate (DOP) and modified by local clay and di-(2-ethylhexyl) phosphoric acid (D2EHPA) incorporated into the polymer as metal ions carrier. The transport of lead (II) and cadmium (II) ions through two kinds of polymer inclusion membrane (PIM) systems, with and without clay, was investigated. The membranes (polymers/plasticizer/carrier/clay) were synthesized using a new method and characterized by various techniques, including Fourier Transform Infrared (FTIR) spectroscopy, Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM) and contact angle determination. A study of Pb(II) and Cd(II) retention using the synthesized membranes was realized. Dialysis experiments of lead and cadmium ions transfer across the polymer inclusion membranes have proved their good performance.
{"title":"\"CARRIER-MEDIATED TRANSPORT OF LEAD AND CADMIUM IONS THROUGH PLASTICIZED POLYMERIC MEMBRANES PREPARED FROM HYBRID ORGANIC–INORGANIC MATERIALS \"","authors":"Hayat Briki, N. Abdellaoui, O. Arous, F. Metref, D. Akretche","doi":"10.35812/cellulosechemtechnol.2022.56.99","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.99","url":null,"abstract":"In this work, the development of polymeric inclusion membranes for elimination of toxic ions is reported. The effect of a local clay additive on the structure and performances of the membranes was studied. The membrane was made up of cellulose triacetate (CTA) and polysulfone (PSu), plasticized by dioctylphtalate (DOP) and modified by local clay and di-(2-ethylhexyl) phosphoric acid (D2EHPA) incorporated into the polymer as metal ions carrier. The transport of lead (II) and cadmium (II) ions through two kinds of polymer inclusion membrane (PIM) systems, with and without clay, was investigated. The membranes (polymers/plasticizer/carrier/clay) were synthesized using a new method and characterized by various techniques, including Fourier Transform Infrared (FTIR) spectroscopy, Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM) and contact angle determination. A study of Pb(II) and Cd(II) retention using the synthesized membranes was realized. Dialysis experiments of lead and cadmium ions transfer across the polymer inclusion membranes have proved their good performance.","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":"42006672","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.2022.56.89
Matea Korica, Zdenka Peršin Fratnik, L. FRAS ZEMLJIČ, M. Kostić
Wound dressings designed with simultaneously adequate antibacterial, sorption, and antioxidant properties enable proper wound healing. Since the antibacterial properties have already been proven in our previous studies, the sorption and antioxidant properties of raw and differently pretreated (TEMPO-oxidized and TEMPO-oxidized cellulose nanofibrils (TOCN) coated) viscose fabrics (CVs), functionalized with chitosan (CH) and chitosan-based nanoparticles with (NCH+Zn) and without incorporated zinc (NCH), were investigated. The sorption properties were evaluated by absorbency rate and capacity, contact angle, zeta potential, and moisture sorption, whereas the antioxidant properties were determined by the ABTS method. The morphological properties of CVs were investigated by SEM. By using pretreatments, the sorption and antioxidant properties of CVs were improved, while subsequent functionalization with CH, NCH and NCH+Zn decreased both properties. However, TOCN-coated CV functionalized with CH and TEMPO-oxidized CV functionalized with NCH still have sorption and antioxidant properties better than raw CV. The obtained results allow the design of antibacterial wound dressings with predefined sorption and antioxidant properties.
{"title":"INSIGHT INTO SORPTION AND ANTIOXIDANT PROPERTIES OF ANTIBACTERIAL WOUND DRESSINGS COMPOSED OF VISCOSE FABRICS FUNCTIONALIZED WITH CHITOSAN AND CHITOSAN-BASED NANOPARTICLES","authors":"Matea Korica, Zdenka Peršin Fratnik, L. FRAS ZEMLJIČ, M. Kostić","doi":"10.35812/cellulosechemtechnol.2022.56.89","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.89","url":null,"abstract":"Wound dressings designed with simultaneously adequate antibacterial, sorption, and antioxidant properties enable proper wound healing. Since the antibacterial properties have already been proven in our previous studies, the sorption and antioxidant properties of raw and differently pretreated (TEMPO-oxidized and TEMPO-oxidized cellulose nanofibrils (TOCN) coated) viscose fabrics (CVs), functionalized with chitosan (CH) and chitosan-based nanoparticles with (NCH+Zn) and without incorporated zinc (NCH), were investigated. The sorption properties were evaluated by absorbency rate and capacity, contact angle, zeta potential, and moisture sorption, whereas the antioxidant properties were determined by the ABTS method. The morphological properties of CVs were investigated by SEM. By using pretreatments, the sorption and antioxidant properties of CVs were improved, while subsequent functionalization with CH, NCH and NCH+Zn decreased both properties. However, TOCN-coated CV functionalized with CH and TEMPO-oxidized CV functionalized with NCH still have sorption and antioxidant properties better than raw CV. The obtained results allow the design of antibacterial wound dressings with predefined sorption and antioxidant 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":"43790524","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.2022.56.94
Margarita María SALDÍVAR GUEVARA, V. Saucedo-Rivalcoba, J. Rivera‐Armenta, Laura Inés ELVIRA TORALES
The development of edible films applied to fruits and vegetables postharvest have generated recent advances regarding the synergistic effect of components on the shelf life of products. Currently, there are edible films made by combining several biopolymers, including chitosan, starch, pectin, alginate, among others. The application of physical barriers, such as films, on the surface of fruits can regulate the permeability to O2, CO2, and water vapor, delaying the natural process of physiological maturity. The use of films also improves the mechanical properties of horticultural products, which are essential in handling them. In the present work, films based on chitosan (antimicrobial agent) and pectin (gelling agent) as a biopolymer matrix, as well as glycerol (plasticizer) and calcium chloride (cross-linking agent), were prepared. The effect of adding the crosslinking agent on the film properties was evaluated by infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and dynamic viscosity testing.
{"title":"\"EVALUATION OF A CROSS-LINKING AGENT IN THE PREPARATION OF FILMS BASED ON CHITOSAN AND PECTIN FOR FOOD PACKAGING APPLICATIONS \"","authors":"Margarita María SALDÍVAR GUEVARA, V. Saucedo-Rivalcoba, J. Rivera‐Armenta, Laura Inés ELVIRA TORALES","doi":"10.35812/cellulosechemtechnol.2022.56.94","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.94","url":null,"abstract":"The development of edible films applied to fruits and vegetables postharvest have generated recent advances regarding the synergistic effect of components on the shelf life of products. Currently, there are edible films made by combining several biopolymers, including chitosan, starch, pectin, alginate, among others. The application of physical barriers, such as films, on the surface of fruits can regulate the permeability to O2, CO2, and water vapor, delaying the natural process of physiological maturity. The use of films also improves the mechanical properties of horticultural products, which are essential in handling them. In the present work, films based on chitosan (antimicrobial agent) and pectin (gelling agent) as a biopolymer matrix, as well as glycerol (plasticizer) and calcium chloride (cross-linking agent), were prepared. The effect of adding the crosslinking agent on the film properties was evaluated by infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and dynamic viscosity testing.","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":"42137304","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.2022.56.95
K. Nguyen
In this study, halloysite clay (HC), a reinforcing nanofiller, was mixed with 1 and 1.5% chitin solutions to prepare chitin–halloysite clay composite hydrogel by phase inversion under water vapor atmosphere at 25 °C. Chitin, extracted chemically from crab shell, was dissolved in N,N-dimethyl acetamide in the presence of 5% lithium chloride (DMAc/5% LiCl), and then different amounts of HC solution (0, 3, 5 and 7%) were added to evaluate the effect of HC on the fundamental properties of the obtained composite hydrogels. After the green route of preparation, the diameter and thickness of the hydrogel samples seemed to remain the same, while varying the concentrations of chitin and inorganic filler solution. As a result, in the case of the 1% chitin hydrogel, the tensile strength of the composite films increased from 335.9 to 489.8 kPa, while the elongation was around 61.3 and 86.0% with the addition of 0 and 7% HC solution. With the increase in the chitin content to 1.5%, the mechanical strength of the resultant composite hydrogels was enhanced. Moreover, the reduction in the equilibrium water content confirmed the formation of a composite hydrogel incorporating a well dispersed nanofiller, with good interfacial interaction between the nanofiller and the biopolymer matrix.
{"title":"\"PREPARATION AND CHARACTERIZATION OF CHITIN HYDROGEL COMPOSITED WITH HALLOYSITE CLAY SOLUTION VIA PHASE INVERSION \"","authors":"K. Nguyen","doi":"10.35812/cellulosechemtechnol.2022.56.95","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.95","url":null,"abstract":"In this study, halloysite clay (HC), a reinforcing nanofiller, was mixed with 1 and 1.5% chitin solutions to prepare chitin–halloysite clay composite hydrogel by phase inversion under water vapor atmosphere at 25 °C. Chitin, extracted chemically from crab shell, was dissolved in N,N-dimethyl acetamide in the presence of 5% lithium chloride (DMAc/5% LiCl), and then different amounts of HC solution (0, 3, 5 and 7%) were added to evaluate the effect of HC on the fundamental properties of the obtained composite hydrogels. After the green route of preparation, the diameter and thickness of the hydrogel samples seemed to remain the same, while varying the concentrations of chitin and inorganic filler solution. As a result, in the case of the 1% chitin hydrogel, the tensile strength of the composite films increased from 335.9 to 489.8 kPa, while the elongation was around 61.3 and 86.0% with the addition of 0 and 7% HC solution. With the increase in the chitin content to 1.5%, the mechanical strength of the resultant composite hydrogels was enhanced. Moreover, the reduction in the equilibrium water content confirmed the formation of a composite hydrogel incorporating a well dispersed nanofiller, with good interfacial interaction between the nanofiller and the biopolymer matrix.","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":"49524197","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.2022.56.100
P. Vassileva, I. Uzunov, D. Voykova
The present study deals with the removal efficiency towards Congo red dye of two cationized cellulose adsorbents prepared from cereal by-products. Rice and einkorn husks were used as raw materials to extract and separate the cellulose by alkali and bleaching treatments. The cellulose materials were modified with N,N-dimethyl-1-octadecylamine to prepare cationized adsorbents. Instrumental methods, such as XRD, DTA, FTIR and SEM, as well as low-temperature nitrogen adsorption, were used for their characterization. The results showed that the quaternary ammonium group was successfully grafted onto the cellulose structures. The survey mainly focused on the effect of process parameters on the adsorption capacity of the investigated materials, including contact time, initial Congo red concentrations, solution pH and temperature. The adsorption process was well described by the pseudo-second-order and Langmuir models. The values of entropy, enthalpy and Gibbs free energy for the Congo red removal were determined.
{"title":"KINETICS, EQUILIBRIUM AND THERMODYNAMICS OF CONGO RED REMOVAL BY CATIONIZED CELLULOSE OBTAINED FROM CEREAL BY-PRODUCTS","authors":"P. Vassileva, I. Uzunov, D. Voykova","doi":"10.35812/cellulosechemtechnol.2022.56.100","DOIUrl":"https://doi.org/10.35812/cellulosechemtechnol.2022.56.100","url":null,"abstract":"The present study deals with the removal efficiency towards Congo red dye of two cationized cellulose adsorbents prepared from cereal by-products. Rice and einkorn husks were used as raw materials to extract and separate the cellulose by alkali and bleaching treatments. The cellulose materials were modified with N,N-dimethyl-1-octadecylamine to prepare cationized adsorbents. Instrumental methods, such as XRD, DTA, FTIR and SEM, as well as low-temperature nitrogen adsorption, were used for their characterization. The results showed that the quaternary ammonium group was successfully grafted onto the cellulose structures. The survey mainly focused on the effect of process parameters on the adsorption capacity of the investigated materials, including contact time, initial Congo red concentrations, solution pH and temperature. The adsorption process was well described by the pseudo-second-order and Langmuir models. The values of entropy, enthalpy and Gibbs free energy for the Congo red removal were determined.","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":"41808585","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：