Bioresource Technology Reports最新文献

In microalgae cultivation systems, fluctuating temperatures impact growth rates and biomass quality, whilst extremes of temperature can lead to the loss of large-scale cultures. Evaluation and selection of strains based on their performance under different temperatures could offer substantial improvements by reducing costs and increasing yields. Here the thermal performance of Tetradesmus obliquus UTEX393 was compared with a novel isolate of the same species, SNS0120, using turbidity-controlled flat-panel photobioreactors. UTEX393 showed higher growth performance at all temperatures and a higher thermal limit compared to SNS0120. Total fatty-acids were not influenced by temperature, but the fatty-acid profiles varied, and omega-3/6 ratios were lower under high temperatures. Transcriptomic analysis of UTEX393 showed that temperature caused substantial shifts in gene expression, with 4971 significantly differentially expressed genes during a temperature upshift from 10 °C (low temperature) to 25 °C (optimal temperature), and 3683 genes significantly differentially expressed from 25 °C (optimal temperature) to 34 °C (high temperature).

Renewable biofuels derived from plants are imperative to meet long-term energy and food needs. Sorghum is globally recognized for its multiple uses as a food, feed, and energy source. Plant biomass represents one of several sustainable and renewable green energy sources. Sorghum (Sorghum bicolor L.) is a robust cereal crop that thrives in arid regions. This review comprehensively explores sorghum's potential for bioenergy production, covering its life cycle, biomass characteristics, yield variability, chemical composition, and energy content. This paper analyzes various processing and conversion technologies for sorghum, examining biochemical (fermentation, and microbial) and thermochemical (hydrothermal liquefaction, pyrolysis, and gasification) approaches. It further explores a range of applications, such as ethanol production, biogas generation, and the synthesis of industrial products. Additionally, it investigates sorghum's role in producing microbial and algal lipids and bioactive compounds for human health. This crop is anticipated to significantly contribute to food, feed, fodder, and fuel security.

The study identified the catabolic genes, enzymes and metabolic pathways involved in spent coolant oil waste (SCW) degradation by mutant S. vacuolatus (MSv) and wild S. vacuolatus cultivated without SCW and with SCW using RNA transcriptomic analysis. Moreover, total petroleum hydrocarbon (TPH) degradation and the metabolites released were determined using GC–MS. Major hydrocarbon (HC) degraded were naphthalene, decane, and benzene,1,3-dimethyl with highly enriched gene ontology obtained that provided strong evidence of enhanced cellular metabolic activities that enabled the oxidation of various hydrocarbons (HCs) present in SCW. Significant residual mass balances (>70 % degradation) were obtained for the polycyclic aromatics (PAHs) and their derivatives. Also, distinct transcripts involved in SCW degradation include 6-CoA-linked acetaldehyde dehydrogenase, 3-coatomer subunit alpha-3 and 1-arginine deiminase. Additionally, a key transcript CoA-linked acetaldehyde dehydrogenase encoding alcohol dehydrogenase for the degradation of naphthalene HCs via a naphthalene degradation pathway was identified. These findings provide a major insight into HC degradation genes and enzymes that can further be exploited for the bioremediation of HC polluted water environments.

The aim of the study is to investigate the synergistic impact of MgO nanoparticles and red dragon fruit peel extract (RFE) on chitosan (CS) biofilm. The CS films were analyzed using FTIR, TGA, ESEM/EDX, XRD, UV-spectra analysis along with contact angle measurement, antioxidant activity, overall migration and biodegradation study. The results showed that as the concentration of RFE increases, improvement in UV-blocking and thermal properties is observed. The FTIR analysis revealed the hydrogen bond interactions among CS, MgO nanoparticles, and RFE. The findings showed that a significant (P < 0.05) increase in 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and 2,2-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid (ABTS) radical scavenging activity, reaching to 37.63 % and 62.83 %, respectively. Also, increase in moisture content, water solubility, and water vapor permeability up to 25.64 %, 38.58 %, and 2.83 × 10⁻¹⁰ g m⁻¹ Pa⁻¹ s⁻¹_, respectively, was found. ESEM images depicted the aggregation of MgO nanoparticles. The films comply with EU 10/2011 safety standards for fatty foods.

The production of microalgae biomass and the management of productivity plays an important role in global biotechnology. This research aimed to study the kinetic characteristics of C. vulgaris growth, conduct an economic analysis of biomass production, and develop a simple optimization model for choosing the optimal cultivation regime. The results showed that the additional CO₂ supply increased the specific growth rate of C. vulgaris by 35 % and increased productivity by 47 %. Analysis of the batch growth curve of microalgae revealed potentially effective cultivation cycles, which were two, four, and six days. Economic analysis revealed that the greatest biomass yield can be obtained using a two-day cultivation period. Depending on the biomass yield, the cost of production, net income, and profitability of production were calculated according to the cultivation cycles.

This study explores the potential of fractional supplementation of the phytohormone indole-3-acetic acid (IAA) to enhance phycocyanin production in Spirulina cultures. Microalgae cultures were supplemented with IAA at specific time points (days 0, 5, 10, 15, 20, and 25), reaching the same supplementation concentration (0.1 mg L⁻¹) in the final 30-day cultivation period. The continuous daily supplementation resulted in a remarkable 229 % (106.41 mg g⁻¹) increase in phycocyanin concentration and a 251 % (8.3 mg L⁻¹ d⁻¹) improvement in productivity compared to the control group without phytohormone addition (32.30 mg g⁻¹ and 2.4 mg L⁻¹ d⁻¹, respectively). Additionally, the strategy successfully reduced the production cost of the pigment by 71 %. This approach can potentially make microalgae-based products more accessible to the population while addressing the industry's need for cost-effective pigment production. The study offers a novel strategy for optimizing natural pigment production and microalgae cultivation.

Rapid development of industry and the persistent discharge of untreated industrial effluents are critical difficulties that cause harmful effects to the environment. About 20 % of the world's freshwater supply is contaminated because up to 70 % of untreated industrial waste is discharged directly into water bodies in some areas. Remediation of contaminated sites utilizing microbial process has demonstrated successful and consistent because of its eco-accommodating features. Biosurfactants are surface dynamic particles having hydrophilic and hydrophobic moieties as their constituents which permit them to connect at interfaces and decrease the surface pressure. Thus, water surface tension can be lowered by biosurfactants from 72 mN/m to as low as 27 mN/m. Additionally, yields of biosurfactant production can be as high as 10 g/L, depending upon the microbial strain and the conditions of fermentation. This review provides in-depth knowledge of properties and classifications, interaction mechanism of biosurfactant and pollutant.

Amoxicillin (AMX), a commonly used antibiotic, has been found in surface waters globally. It has raised environmental concerns due to potential risks such as generating antibiotic resistance, genotoxicity, and disruption of ecology. This study investigates the prospect for Amoxicillin degradation using a Microbial Fuel Cell (MFC) powered by a native microbial community. This research encompasses an analysis of the degradation profile, electricity generation, and microbes involved in the process. Prior to acclimatization (using 1000 Ω external resistance), experiments were conducted for a duration of 72 h, during which the initial concentration and pH value of amoxicillin were altered. Electric potential was measured, and amoxicillin content was determined using High Performance Liquid Chromatography (HPLC). Microbial community composition was evaluated through 16S rRNA sequencing. Amoxicillin reduction were 17.85 ± 4.35 %, 42.82 ± 2.78 %, and 66.17 ± 0.47 %, with corresponding power generation values of 450.99, 267.55, and 171.99 μW/m² for starting amoxicillin concentrations of 10, 20, and 30 mg/L, respectively. The experiment produced a maximum power of 972.97 μW/m² at pH 8.2 with a 73.42 ± 6.93 % reduction in AMX. A microbial community composition shift was detected and an exoelectrogen, Chromobacterium, was identified as the dominating microbe post-operation. This study underscores the potential of MFCs in amoxicillin degradation, providing valuable insights for future advancements of antibiotics and pharmaceuticals removal in wastewater remediation.

The persistent global energy crisis is propelling significant innovations, including the use of palm fatty acid distillate (PFAD) as a renewable resource for producing green diesel (GD). Therefore, this study aimed to intensify GD synthesis from PFAD by optimizing the process using a Response Surface Methodology-Box Behnken Design (RSM-BBD). Optimization was achieved with a nickel phosphide catalyst supported by natural zeolite through hydrodeoxygenation method. RSM-BBD was used to design the process, considering time (1−3 h), temperature (300–350 °C), catalyst concentration (5–15 %), and pressure (20–60 bar). The results showed that the optimum conditions consisted of 11 % catalyst concentration, 3 h of reaction time, 342 °C temperature, and 29 bar pressure, leading to a 96.35 % GD yield. All conversion parameters, except pressure, significantly influenced GD yield. The quality of the synthesized GD showed high quality and compliance with Indonesian as well as European diesel fuel standards.

Nonwood fibers are appealing substitutes for the raw materials for the pulp and paper sector, such as for packaging, whose market demand is growing, given their variety of sources and the decreasing trend of wood supply. To change the inherent hydrophilic properties of fibers, several specialty papers with additional features, such as hydrophobic qualities, have been actively produced globally. Compared with hydrophobic paper, superhydrophobic paper has a larger water contact angle (>150°), which endows it with superior capabilities, such as water repellence, anticorrosion, self-cleaning, anti-icing, drag reduction, and easy roll-off. This review presents the fundamentals of wettability, progress in preparing superhydrophobic nonwood papers, determination of the properties of superhydrophobic nonwood papers, characterization of superhydrophobic nonwood papers, and application of superhydrophobic nonwood papers. The future challenges, research, and development of superhydrophobic paper made from nonwood fibers are also briefly discussed. It is expected that durable superhydrophobic papers from non-wood sources can be produced using environmentally-friendly and economically-feasible technologies. Life cycle and techno-economic evaluations of superhydrophobic paper made from nonwood materials are recommended. The usage of these papers to replace plastic-based materials in food packaging and advanced applications like sensing devices would help to increase the use of sustainable materials.