Some physical and mechanical properties of African birch (&lt;i&gt;Anogeissus leiocarpus&lt;/i&gt;) timber

Bello, Ayodeji; Jimoh, A.A.

doi:10.4314/jasem.v22i1.14

Cited by 10 publications

(15 citation statements)

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“…According to African plant database and plant list database 2010 [ 13 ], there are nine species belonging to the genus Anogeissus , of which eight are native to tropical Asia. A. leiocarpa is the only African species, and it grows in various geographical zones and different vegetation types such as bushlands, savannas, and woodlands, and due to its good tolerance to drought and high soil salinity, it can even grow in drylands and arid and semi-arid grasslands [ 9 , 14 , 15 ]. A. leiocarpa is a deciduous tree that can reach heights of 15–18 m ( Figure 1 B).…”

Section: Introductionmentioning

confidence: 99%

Potential Anti-Tuberculosis Activity of the Extracts and Their Active Components of Anogeissus leiocarpa (DC.) Guill. and Perr. with Special Emphasis on Polyphenols

et al. 2020

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In Sudanese traditional medicine, decoctions of the stem bark of Anogeissus leiocarpa are used for the treatment of tuberculosis (TB). However, this plant has not been investigated before for its antimycobacterial effects. Our screening results show, for the first time, that many extracts of various parts of A. leiocarpa exhibit growth inhibitory activity against Mycobacterium smegmatis. Minimum inhibitory concentration (MIC) values ranged between 625 and 5000 µg/mL, with an ethyl acetate extract of the root showing the lowest MIC value. The good antimycobacterial effects of the root part could be due to its high concentration of ellagic acid derivatives, ellagitannins, and flavonoids. Thin layer chromatography (TLC) fractionation resulted in some fractions with better activity than the starting point crude methanol extract (MIC 2500 µg/mL). Those fractions with the lowest MIC values contained a high number of antioxidant compounds. Fractions 3 and 4 (MIC 1500 and 1000 µg/mL, respectively) contained high concentrations of di-methyl ellagic acid ([M-H]− 329.0318). Fraction 6 (MIC 2000 µg/mL) contained a lower concentration of di-methyl ellagic acid and was not as growth inhibitory as fractions 3 and 4. Moreover, in fraction 3, an acetylated ellagic acid derivative ([M-H]− 343.0477) and di-methyl-ellagic acid xyloside ([M-H]− 461.0739) were tentatively characterized. Di-methyl ellagic acid xyloside was also present in fraction 4 and could strongly contribute to the antimycobacterial effect of this fraction. Additionally, protocatechuic acid ([M-H]− at m/z 153.0196) was present in fraction 4. Our antimycobacterial results obtained from this research justify the use of A. leiocarpa in Sudanese folk medicine against cough related to TB. Roots, stem bark, and leaves of A. leiocarpa are sources for new potent anti-TB drug lead compounds.

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Section: Introductionmentioning

confidence: 99%

Potential Anti-Tuberculosis Activity of the Extracts and Their Active Components of Anogeissus leiocarpa (DC.) Guill. and Perr. with Special Emphasis on Polyphenols

et al. 2020

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“…Adjustments were made to the characteristic values for density (at the test MC) using equation (5a) & (5b) [2,13]; to conform to reference grading conditions. This is with reference to conditions provided by [35,36] and provision by international grading standards [7].…”

Section: Densitymentioning

confidence: 99%

“…Using equation (10a) and (10b) respectively, MC adjustment was made to the characteristic value of MOR, with respect to the measured MC and with reference to BS EN 338 [36]; to conform to the equivalent reference moisture conditions of 12% and 18% [2,13].…”

Section: Mor and Moementioning

confidence: 99%

“…With reference to [7,36], and with regards to the measured MC, adjustments were also made to the characteristic value of MOE, to conform with the reference MC conditions (12% and 18%) by applying equations (13a) and (13b) as recommended by [2,13].…”

Section: Modulus Of Elasticitymentioning

confidence: 99%

“…In Nigeria the quality and characteristics of conventional timber species such as Teak Wood (Tectona grandis), Mahogany (Khaya spp. ), Apa, (Afzelia africana), Iyip Okoyo (Stauditiastpitata), African birch (Anogeissus leiocarpus), etc., have received renewed attention [11,12,13]. Localized alternatives such as Rubber trees (Hevea brasiliensis), African oil palm (Elaeis Guineensis), African fan palm or African palmyra palm (Borassus aethiopum) and Bamboo (Bambusa vulgaris) also require some attention for economic reasons as well as for environmental concerns [1].…”

Section: Introductionmentioning

confidence: 99%

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Characterization, Grading and Flexural Modelling of Rubberwood (Hevea brasiliensis); for the Local and International Construction Industry

Akpokodje

Uguru

Esegbuyota

2020

JERR

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Rubberwood, hitherto solely employed as fuel wood has found fairly suitable use in the Nigerian construction industry. This paper investigated the engineering properties of this low cost, alternative, timber material, produced from Rubber trees (Hevea brasiliensis); often employed within two weeks of felling, for the construction of formworks and related wood works. No real attempt has been made to formally grade or coordinate the properties of rubber wood as employed in the Nigerian construction industry. The research was aimed to achieve the determination of the physical and mechanical properties of naturally seasoned rubber wood obtained from the Niger Delta region of Nigeria, and assigned to it a strength/grade class. Specific properties required for grading were determined using suitable standard methods. The structural and mechanical properties of the timber wood were determined using the three point bending test in accordance with standards presented by BS EN 408 and ASTM D193, but with an aspect ratio of 12. Characteristic values for the wood properties (at the tested moisture content “MC”) were determined in accordance with BS EN 384. Adjustments were made to the characteristic values for the mechanical properties, and the density of the timber species at the test MC; to conform with the international reference MC condition of 12% (as specified by BS EN 338), and also 18% MC, to suit standards required for the Nigerian environmental condition (NCP 2). Grading was carried out in accordance with BS EN 338. The characteristic values for the mechanical properties (at 12% and 18% MC) evaluated from test results are as follows; characteristic values for MOR and MOE were 20.191 N/mm2 and 19.283 N/mm2, and 2285.784 N/mm2 and 2195.606 N/mm2 respectively. Mean values for densities (at 12% and 18% MC) were 406.169 Kg/m3 and 431.058 Kg/m3, while the characteristic values for the related densities were 338.474 Kg/m3 and 359.215 Kg/m3. Furthermore, the mean green density and characteristic green density for the rubberwood were 988.148 Kg/m3 and 900.352 Kg/m3 respectively. From the results obtained, rubberwood procured from the Niger Delta region was categorized as a grade D30 and D35 timber material at 18% MC and 12% MC respectively. Rubberwood from the Niger Delta can be conveniently employed as an alternative material to conventional timber, in both the furniture and the construction industry, but with special considerations.

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Directional variability of wood properties in Pinus wallichiana and Dalbergia sissoo of South Asian origin

Hassan

Mahr

Iqbal

et al. 2023

International Wood Products Journal

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Pinus wallichiana and Dalbergia sissoo wood is widely used in the construction and furniture industry in Pakistan. However, directional variability of physical properties, which can be important for wood-based industry, remains poorly documented. In both wood types, water and moisture uptake, water contact angle, and compressional strength varied significantly along the three directions. Water and moisture uptake was found significantly higher in tangential direction while water contact angle, and compressional strength was found the highest along the longitudinal direction in both wood types. Furthermore, thermal conductivity and diffusivity were found the highest along longitudinal direction however, specific heat capacity was found the highest in radial direction. Based on the results it can be concluded that although, dimensional variability was more pronounced in Dalbergia sissoo wood however, studies on site-specific variations in physical properties need further investigations for better recommendations.

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Some physical and mechanical properties of African birch (<i>Anogeissus leiocarpus</i>) timber

Cited by 10 publications

References 1 publication

Potential Anti-Tuberculosis Activity of the Extracts and Their Active Components of Anogeissus leiocarpa (DC.) Guill. and Perr. with Special Emphasis on Polyphenols

Potential Anti-Tuberculosis Activity of the Extracts and Their Active Components of Anogeissus leiocarpa (DC.) Guill. and Perr. with Special Emphasis on Polyphenols

Characterization, Grading and Flexural Modelling of Rubberwood (Hevea brasiliensis); for the Local and International Construction Industry

Directional variability of wood properties in Pinus wallichiana and Dalbergia sissoo of South Asian origin

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