Chemistry of wood
Seddigheh Afraz; Seyyed Khalil Hosseinihashemi
Abstract
In this research, the bark extract of the yew (Taxus baccata L.) tree trunk grow in AfraTakhte forest cache of Aliabad-e Katul) located in Golestan province was extracted with acetone solvent and by Soxhlet apparatus method and then the chemical components within it were identified. The bark of prepared ...
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In this research, the bark extract of the yew (Taxus baccata L.) tree trunk grow in AfraTakhte forest cache of Aliabad-e Katul) located in Golestan province was extracted with acetone solvent and by Soxhlet apparatus method and then the chemical components within it were identified. The bark of prepared disks was separated and converted to the flour. Afterwards, extract insoluble acetone solvent was prepared according to TAPPI standard method. In order to silylation of compounds, amount of dry powder of extract was poured into a glass vial and the derivative materials (pyridine, BSTFA + TMCS 1%) were added to it and to identification the sample was injected to the gas chromatography- mass spectrometry device. The results from this research indicated that the mean value of acetone extract of yew bark was 13.63%. Generally, 46 compounds were identified in the yew bark. The most abundant identified compounds were including: tetrasiloxane, decamethyl- (14.80%), hexadecanoic acid, hydroxy ester (11.24%), 3-(3-aminopropyl)-6-(3,3-dimethylallylamino)purine (9.85%), d-ribofuranose, 1,2,3,5-tetrakis-O-(hydroxy)- (9.31%), 2-methylpyrrolo[1,2-a]pyrazin-1(2H)-one (6.73%). The various chemical components such as phenolic, flavenoid, alkaloid, fatty acid, fatty acid ester, sugar, alkane, fatty alcohol, alcoholic sugar, and stroied were identified in the acetone extract of yew bark that some of them can synthesized as preservatives for inhibition of wood-degrading organisms. The most important identified cytotoxic and anticancer compounds in the acetone extract of yew bark has been 4-piperidinone, 2,2,6,6-tetramethyl- (0.19%) and phenol, 2,4-bis(1,1-dimethylethy)- (3.32%).
Management and Economics wood
Latif Nazari; Seyyed Khalil Hosseinihashemi
Abstract
In this research, the individual and interaction effects of three organic biocides (propiconazole, tebuconazole, and chlorothalonile) with the metal chelator EDTA and the antioxidant BHT at different concentrations (50, 150, 250, 350, and 450 ppm) against the white-rot fungus, Trametes versicolor was ...
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In this research, the individual and interaction effects of three organic biocides (propiconazole, tebuconazole, and chlorothalonile) with the metal chelator EDTA and the antioxidant BHT at different concentrations (50, 150, 250, 350, and 450 ppm) against the white-rot fungus, Trametes versicolor was investigated. In under laminar sterile hood, about 25 mL of the media was poured into the Petri plates. Three antibiogram discs (with triangular position) put on the media. By micro-sampler about 20 μL of steriled preservative solutions was poured on every disc, separately. Then, about 5 mm of mycelium plug of intended fungus that was inoculated previously was put in the center of plates. The plates were incubated and daily for one week, the mycelium growth of fungus and inhibition effects of different preservative solutions against fungus was measured. The results of this research demonstrated that chlorothalonil biocide by itself have not any inhibition effect on growth of fungus, whilst propiconazole and tebuconazole biocides by itself have significant effect at different concentrations on growth of fungus. In consider of synergistic effect of propiconazole, tebuconazole, and chlorothalonil biocides with non-biocides additives of EDTA and BHT, it has been found that there is synergistic effect between propiconazole biocide and the metal chelator EDTA at high concentration such as 450 ppm, but in combination with other solutions synergistic effect has not been found. Also, any synergistic effect has not found between tebuconazole and chlorothalonil biocides with other preservative solutions.
Seyyed Khalil Hosseinihashemi; Ali Bagheri; Vahidreza Safdari; Hassan Sadeghifar
Abstract
Black locust wood is durable against microorganisms. The species is planted as a nitrogen fixing specie in many arid and semiarid areas of Iran. Extraction procedures included soaking wood samples in hexane solvent for 15 days were applied. Average percentage of black locust heartwood extractives was ...
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Black locust wood is durable against microorganisms. The species is planted as a nitrogen fixing specie in many arid and semiarid areas of Iran. Extraction procedures included soaking wood samples in hexane solvent for 15 days were applied. Average percentage of black locust heartwood extractives was determined as 8.4 percent. Identification of chemical compounds in the extractives was performed on a GC/MS device. Generally, 25 compounds were identified with different percentage in heartwood. The most abundant compound within the hexane heartwood extract of black locust samples was hexadecanoic acid as a trimethylsilyl ester, amounting to 13.39% saturated fatty acids group. The most important identified unsaturated fatty acids in the heartwood of the species 9, 12-octadecadienoic acid (Z, Z) - (10.10%). Tetradecane (6.88%) and hexadecane (6.15%) were the most important identified alkenes in the heartwood of the species. Also squalene as pure and mineral hydrocarbon oil was identified amounting to 1.17%. Squalene Vaccine manufacturers has proved that the squalene is effective against virus diseases of animals
Vahid Safdari; Seyyed Peyman Hashemi Beygzadmahalleh; Asghar Tabei; Seyyed Khalil Hosseinihashemi
Abstract
Tobacco (Nicotiana tabacum) is one of the non-wood species and its stalks are the main crop after harvesting which can be used in composite board and paper industry. For better use of this non-wood fibrous raw material, the evaluation of anatomical, morphological and chemical components are necessary. ...
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Tobacco (Nicotiana tabacum) is one of the non-wood species and its stalks are the main crop after harvesting which can be used in composite board and paper industry. For better use of this non-wood fibrous raw material, the evaluation of anatomical, morphological and chemical components are necessary. Tobacco stalks "Coker"cultivar 347 which is widely planted in Gilan province of Iran were randomly sampled. Anatomical properties (cross, tangential and radial sections) and morphological properties (fiber length, fiber diameter, and cell wall thickness) were measured and the indices and ratio of the fibers including: slenderness index, runkel index, flexibility ratio in three heights of stem (5%, 50% and 75%) were calculated. The Chemical components including: Cellulose, lignin, ash, alpha cellulose and hemicellulose of stem with bark and without bark were recorded according to related standards and the results were ststistically analyzed. Results showed that the chemical components of the tobacco stalk were desirable but the index of L/D of fibers were lower than many non-woods and hardwoods. Therefore, it is assumed that the paper produced from tobacco stalks do have suitable tear strength. The runkel index (2 cell wall thickness / fiber diameter) is close to hardwoods and many non-woods, Therefore, it is presumed that paper have appropriate tensile, burst and folding strength. It is predicted that tobacco stalks combined with softwoods with long fibers can produce good quality paper.
Vahid reza ُSafdari; Behzad Shabani; Seyyed Khalil Hosseinihashemi; Mehran Roohnia; Vilma Bayamzadeh
Abstract
Air pollutantion in particular pollutants from automobile exhaust can affect anatomical and morphological characteristics of woods. In order to investigate the impact of this factor, Pinus eldarica trees of Chitgar park in Tehran, the area which is extended from south to crowded highway (polluted ...
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Air pollutantion in particular pollutants from automobile exhaust can affect anatomical and morphological characteristics of woods. In order to investigate the impact of this factor, Pinus eldarica trees of Chitgar park in Tehran, the area which is extended from south to crowded highway (polluted site) and in north to Alborz Mountain (unpolluted site) and the middle part (semi-polluted site) were sampled by increment borer. After cross-dating, the tree rings of recent 5 years were separated from the old rings. Then anatomical characteristics of cross section, including transition between early and latewood, tangential thickness of last formed latewood tracheides, frequency of ray and resin ducts and morphological characteristics of tracheids in three zones and in the same rings were studied. Results indicated that the ring width pattern of Pinus eldarica in three zones is somehow the same. The frequency of resin duct and rays and false rings in 2005 and 2006 in the polluted and semi-polluted site were higher compare to the unpolluted site. Fiber length, wall thickness (2d) and lumen size of trees of unpolluted site were more than the other two sites (Polluted and Semi-polluted). In general, it could be concluded that air pollution impact on tree ring width can reduce wood quality as well.
Physics and anatomy
Mohammad reza Nicsresht sigharodi; Vahid reza Safdari; Mohammad javad Sepideh dam; sayed Khalil Hosseini hashemi
Abstract
Paper’s components identification is important for pulp and paper mills and many organizations. In the present study we tried to identify paper fibers and introduce the most important anatomical characteristics which are effective in identification. First anatomical characteristics of wood and ...
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Paper’s components identification is important for pulp and paper mills and many organizations. In the present study we tried to identify paper fibers and introduce the most important anatomical characteristics which are effective in identification. First anatomical characteristics of wood and non-wood species which are important in pulp and paper industry were investigated. Then the papers of 3 important paper mills in Iran (totally 5 different papers) which their raw material include forest species, imported pulp and waste paper were sampled and examined. Many slides have been prepared according to ISO 9184-1 (ISO 1990) standard and valuable Atlases useful for identification of exotic species were reviewed. At the end important anatomical characteristics were recorded. Results showed that the fiber identification of papers is feasible. For softwoods identification, cross-field pits and for hardwoods, vessel shape, including, spiral thickening, perforation plate, inter-vessel pits and especially ray- vessels pits are the most crucial features for identification. Parenchyma, fiber biometric properties and fiber shape, in most species were similar and least effective in identification process. Epidermal cells, parenchyma and vessels were the most important anatomical feature for identification of non-woods.
Management and Economics wood
Mehdi Modirzarea; Sayed khalil Hosseini hashemi; Amir Nourbakhsh; Vahid Safdari
Abstract
In this study the effect of white and brown-rot fungi on durability and hardness characteristics of Bagasse/Polypropylene composite was evaluated. The test specimens were prepared using Bagasse fibers (38%), Polypropylene (60%), and maleic anhydride (2%) according to respective standard and by hot press ...
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In this study the effect of white and brown-rot fungi on durability and hardness characteristics of Bagasse/Polypropylene composite was evaluated. The test specimens were prepared using Bagasse fibers (38%), Polypropylene (60%), and maleic anhydride (2%) according to respective standard and by hot press method. Then specimens were exposed to white (Coriolus versicolor) and brown-rot (Coniophora puteana) fungi according to BS 838:1961 standard and Kollescale method at 8, 12 and 16 weeks. After that, superficial damage, weight loss, and hardness strength of samples were determined. The results showed that superficial damage of brown-rot fungus was lower than white-rot fungus. The weight loss of white-rotted samples were significantly (P<0.05) higher than brown-rotted one, but the hardness of white-rotted samples was a little higher than brown-rotted one. Totally by increasing of time the severity of decay increased.
