NC State
  • Researchpp 3718-3733Camlibel, O. (2021). "Effect of calcite addition on technical properties and reduction of formaldehyde emissions of medium density fiberboard," BioResources 16(2), 3718-3733. AbstractPDF

    Physical, mechanical, and formaldehyde emission properties were studied for medium density fiberboard (MDF) produced with oak (75%) and pine (25%) fibers that had been mechanically refined in the presence of calcite particles. The calcite slurry was prepared at two levels of solids, 1.5% and 3% (10 and 20 kg·m-³). Chips were cooked for 4 min at 185 °C, under 8 bar vapor pressure in an Andritz defibrillator. 1.8% liquid paraffin, 0.72% ammonium sulphate solution, and 11% urea-formaldehyde were added by percentage based on oven-dried wood fibers in the blowline at the exit of the defibrator. The fibers were dried to 11% moisture content. MDF boards (2100 mm × 2800 mm × 18 mm) were created using a continuous hot-press process. The addition of calcite in the course of MDF production resulted in improved physical properties, such as thickness swelling (ThS 24 hours) and water absorption (WA 24 hours). MDF boards prepared with calcite exhibited higher internal bond (IB), modulus of rupture (MOR), and modulus of elasticity (MOE). Resistance to axial withdrawal of screw also was increased by addition of 3% calcite. In addition, the lowest levels of formaldehyde emission were observed for MDF prepared with calcite at the 3% level.

  • Researchpp 3734-3745Gao, W., Huang, L., Lei, Z., and Wang, Z. (2021). "Camellia oleifera shell as a potential agricultural by-product for paper production," BioResources 16(2), 3734-3745. AbstractPDF

    The aim of this study was to investigate a potential biorefinery process to realize the high utilization of Camellia oleifera shell (COS), which is an agricultural by-product mainly composed of cellulose, hemicellulose, and lignin. Before treatment by steam explosion, the COS was impregnated with water, 3.0 wt% NaOH solution, or 3.0 wt% H2SO4 solution. The morphological structure and chemical composition of the steam-exploded COS pulp were investigated. The results indicated that the impregnation treatments increased the cellulose content of the steam-exploded COS pulp and decreased the hemicellulose and lignin content. The morphology of steam-exploded COS fiber was short, coarse and stiff. Hydrophobic and colorful handsheets were fabricated by mixing proportional bleached softwood fiber. This study demonstrated that COS was a potential material for the papermaking industry, and the combination of water impregnation and steam explosion treatment for COS was a good pulp process.

  • Researchpp 3746-3759Teles, V. C., Roldi, M., Luz, S. M., dos Santos, W. R., Andreani, L., and Valadares, L. F. (2021). "Obtaining plasticized starch and microfibrillated cellulose from oil palm empty fruit bunches: Preparation and properties of the pure materials and their composites," BioResources 16(2), 3746-3759.AbstractPDF

    Starch and celluloses are biodegradable resources of great importance in terms of marketing. These biopolymers can be used to generate films with interesting mechanical, optical, and thermal properties, which can substitute for plastic films in certain applications, e.g., packaging materials. This study describes the preparation of pure plasticized starch films, prepared from soluble starch and glycerol, and the preparation of microfibrillated cellulose films from oil palm empty fruit bunches fabricated via casting. Composites made of plasticized starch were also prepared with microfibrillated cellulose added in 10% increments. The density, color difference, opacity, morphology, water activity, water affinity, and thermal and mechanical characteristics of the films were investigated. Plasticized starch is a translucent material with contact transparency; it is fragile and has relatively high water and glycerol contents. The thermogravimetric analysis of materials displayed up to four stages of weight loss related to water evaporation, glycerol, starch, and cellulose thermal degradation. As a consequence, the materials with higher cellulose content exhibited better thermal resistance. The composites with 90% of microfibrillated cellulose resulted in increased tensile strength when compared to the pure materials. The pure microfibrillated cellulose presented the highest values of Young modulus. The addition of plasticized starch to microfibrillated cellulose improved the maximum strain of the composites.

  • Researchpp 3760-3770Ferreira, J., Esteves, B., Ayata, Ü., Cruz-Lopes, L., and Domingos, I. (2021). "Land use impact of maritime pine and eucalypt: A life cycle assessment study," BioResources 16(2), 3760-3770.AbstractPDF

    The forestry sector in Portugal faces important challenges, resulting in an increased incidence of fires and the action of pathogens, which puts the sustainability of forest resources at risk. Due to the economic, social, and environmental importance of forests, this work assessed the land use environmental impact of maritime pine and eucalypt standing in Portuguese forests. SimaPro software was used to translate the inventory table results into land use impact category. The ILCD 2011 Midpoint+ method was chosen to assess the “land use” environmental impact that focuses on soil quality and its indicator (kg carbon deficit), which describes the changes in soil organic matter associated with land interventions. The results showed that for the first rotation time, the land use impact category per cubic meter of maritime pine is 18423 kg C deficit and 23430 kg C deficit for eucalypt, which means that the land use impact category of eucalypt is 27% higher than the impact of maritime pine.

  • Researchpp 3771-3782Li, X., Zhang, X., Xing, M., Chen, R., Zhao, X., and Xia, D. (2021). "Antioxidant and antibacterial activities of Pterocarya stenoptera bark extract and its mechanism on Staphylococcus aureus through cell membrane damage," BioResources 16(2), 3771-3782. AbstractPDF

    Pterocarya stenoptera bark extract (PSBE) was assessed for its chemical constituents, antioxidant activity, and antibacterial activity. The total phenolic content (TPC) in the PSBE was 272.92 ± 3.22 mg gallic acid equivalent (GAE)/g. Three phenolic compounds (quercetin-3-O-(2″-O-galloyl)-rhamnoside, quercetin, and juglone) were identified in the PSBE via ultraperformance liquid chromatography/mass spectroscopy (UPLC/MS) analysis. The PSBE possessed remarkable antioxidant activity in the DPPH and ABTS+ radicals scavenging system, with IC50 values of 96.25 ± 3.82 μg/mL and 158.26 ± 6.08 μg/mL, respectively. Moreover, the PSBE had high antibacterial activity, which was especially sensitive to Staphylococcus aureus. The antibacterial mechanism of the PSBE on the S. aureus was related to the deformation of the cell morphology and the destruction of the cell membrane structure, which was confirmed using a BacLight Viability Kit and scanning electron microscope (SEM) observations. These findings suggest that the strong antioxidant and antibacterial properties of the bark extract from P. stenoptera make the tree species suitable as a natural additive in the pharmaceutical, food, and cosmetic industries.

  • Researchpp 3783-3796Düzkale Sözbir, G. (2021). "Utilization of various lignocellulosic substrates for Pleurotus ostreatus mushroom cultivation in the manufacturing of polycaprolactone (PCL)-based biocomposite films," BioResources 16(2), 3783-3796. AbstractPDF

    The possibility of using beech wood sawdust and hazelnut husk waste generated during the cultivation of Pleurotus ostreatus mushrooms as a filler in polycaprolactone (PCL)-based biocomposite films was investigated. Chemical and physical properties of the PCL biocomposites were determined. The beech sawdust and hazelnut husk were exposed to degradation for 73 d and 78 d, respectively, in slightly acidic environments at a relative humidity of 75%. The degraded materials caused the holocellulose and lignin contents in the PCL biocomposites to decrease, while the cellulose and α-cellulose contents increased. In general, as the lignocellulosic waste content increased, the tensile strength (TS) and elongation at break (EatB) values decreased and the tensile modulus (TM) and water absorption (WA) values increased. It was determined that the PCL biocomposite with the degraded beech sawdust absorbed more water than the composite with the undegraded beech sawdust. On the other hand, the PCL biocomposite with the degraded hazelnut husk absorbed less water than the composite with the raw hazelnut husk.

  • Researchpp 3797-3807Ganash, M., Abdel Ghany, T. M., Al Abboud, M. A., Alawlaqi, M. M., Qanash, H., and Amin, B. H. (2021). "Lignocellulolytic activity of Pleurotus ostreatus under solid state fermentation using silage, stover, and cobs of maize," BioResources 16(2), 3797-3807. AbstractPDF

    Lignocellulolytic white-rot fungi allow the bioconversion of agricultural wastes into value-added products that are used in a myriad of applications. The aim of this work was to use corn residues (Zea mays L.) to produce valuable products under solid-state fermentation (SSF) with Pleurotus ostreatus. White-rot fungus P. ostreatus was isolated from maize silage (MS) and thereafter it was inoculated on MS as substrate and compared with maize stover (MSt) and maize cobs (MC) to determine the best lignocellulosic substrate for the production of lignocellulolytic enzymes and extracellular protein. The MS gave the highest productivity of CMCase (368.2 U/mL), FPase (170.5 U/mL), laccase (11.4 U/mL), and MnPase (6.6 U/mL). This is compared to productivity on MSt of 222 U/mL, 50.2 U/mL, 4.55 U/mL, and 2.57 U/mL, respectively; and productivity on MC at the same incubation period as 150.5 U/mL, 48.2 U/mL, 3.58 U/mL, and 2.5 U/mL, respectively. The levels of enzyme production declined with increasing incubation period after 15 and 20 days using MS and MC, respectively, as substrates. Maximum liberated extracellular protein content (754 to 878 µg/mL) was recorded using MS, while a low amount (343 to 408 µg/mL) was liberated with using MSt and MC.

  • Reviewpp to be addedZhang, J., Yang, J., Zhang, H., Zhang, Z., and Zhang, Y. (2021). "Research status and future development of biomass liquid fuels," BioResources 16(2), Page numbers to added.AbstractPDF

    Due to the combined pressures of energy shortage and environmental degradation, bio-liquid fuels have been widely studied as a green, environmentally friendly, renewable petroleum alternative. This article summarizes the various technologies of three generations of biomass feedstocks (especially the second-generation, biomass lignin, and the third-generation, algae raw materials) used to convert liquid fuels (bioethanol, biodiesel, and bio-jet fuel) and analyzes their advantages and disadvantages. In addition, this article details the latest research progress in biomass liquid fuel production, summarizes the list of raw materials, products and conversion processes, and provides personal opinions on its future development. The aim is to provide a theoretical basis and reference for the optimization of existing technology and future research and development of biomass liquid fuels.

  • Researchpp 3808-3814Król, P. (2021). "Drill holes deflection determination for small diameter bits in wood-based materials," BioResources 16(2), 3808-3814. AbstractPDF

    The growing interest in wood accessories has focused scientific research attention on wood cutting with small diameter tools. A problem that may arise when drilling wood is the phenomenon of wandering – when the hole is not made in the designed place. The difficulty in studying small diameter drill holes (0.5 mm to 0.9 mm) is due to the difficulty of automatic measurement. The development of an appropriate methodology may allow for the observation of this phenomenon without the need for high-class hardware and expensive software. This article presents the results of tests carried out on nearly 500 samples made of various wood-based materials (high-density fiberboard (HDF), medium-density fiberboard (MDF), chipboard, and plywood) in terms of the usefulness of the OpenCV computer vision library for the determination of wandering.

  • Researchpp 3815-3826França, F. J. N., Shmulsky, R., Ratcliff, T., Farber, B., Senalik, C. A., Ross, R. J., and Seale, R. D. (2021). "Interrelationships of specific gravity, stiffness, and strength of yellow pine across five decades," BioResources 16(2), 3815-3826. AbstractPDF

    The interrelationships among specific gravity (SG), modulus of elasticity (MOE), and strength (modulus of rupture, MOR) are largely the foundational basis for non-destructive evaluation and testing. Resource monitoring and commercial structural lumber production often rely upon such non-destructive evaluation to predict the bending and/or tension strength of individual members. These technologies require routine calibration. In addition, it is important to know the extent to which a given resource may change over time. To that end, this study investigated the relationship among SG, MOE, and MOR of small clear specimens from three samples taken across an approximate 50-year period; 1965 to 2018. Coefficients of determination among these variables are presented along with the prediction equations. These findings can be used to gain insight into the reliability and stability of these relationships over time.