Abstract:
BACKGROUND:Acid hydrolysis is a popular pretreatment for removing hemicellulose from lignocelluloses in order to produce a digestible substrate for enzymatic saccharification. In this work, a novel model for the dilute acid hydrolysis of hemicellulose within sugarcane bagasse is presented and calibrated against experimental oligomer profiles. The efficacy of mathematical models as hydrolysis yield predictors and as vehicles for investigating the mechanisms of acid hydrolysis is also examined. RESULTS:Experimental xylose, oligomer (degree of polymerisation 2 to 6) and furfural yield profiles were obtained for bagasse under dilute acid hydrolysis conditions at temperatures ranging from 110°C to 170°C. Population balance kinetics, diffusion and porosity evolution were incorporated into a mathematical model of the acid hydrolysis of sugarcane bagasse. This model was able to produce a good fit to experimental xylose yield data with only three unknown kinetic parameters k a ,k b and k d . However, fitting this same model to an expanded data set of oligomeric and furfural yield profiles did not successfully reproduce the experimental results. It was found that a "hard-to-hydrolyse" parameter, α, was required in the model to ensure reproducibility of the experimental oligomer profiles at 110°C, 125°C and 140°C. The parameters obtained through the fitting exercises at lower temperatures were able to be used to predict the oligomer profiles at 155°C and 170°C with promising results. CONCLUSIONS:The interpretation of kinetic parameters obtained by fitting a model to only a single set of data may be ambiguous. Although these parameters may correctly reproduce the data, they may not be indicative of the actual rate parameters, unless some care has been taken to ensure that the model describes the true mechanisms of acid hydrolysis. It is possible to challenge the robustness of the model by expanding the experimental data set and hence limiting the parameter space for the fitting parameters. The novel combination of "hard-to-hydrolyse" and population balance dynamics in the model presented here appears to stand up to such rigorous fitting constraints.
journal_name
Biotechnol Biofuelsjournal_title
Biotechnology for biofuelsauthors
Greenwood AA,Farrell TW,Zhang Z,O'Hara IMdoi
10.1186/s13068-015-0211-5subject
Has Abstractpub_date
2015-02-19 00:00:00pages
26issn
1754-6834pii
211journal_volume
8pub_type
杂志文章abstract:Background:Cyanobacteria have shown promising potential for the production of various biofuels and chemical feedstocks. Synechococcus elongatus UTEX 2973 is a fast-growing strain with pronounced tolerance to high temperatures and illumination. Hence, this strain appears to be ideal for the development of photosynthetic...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-018-1215-8
更新日期:2018-08-04 00:00:00
abstract:BACKGROUND:Low- and high-affinity glucose transport system is a conserved strategy of microorganism to cope with environmental glucose fluctuation for their growth and competitiveness. In Neurospora crassa, the dual-affinity glucose transport system consists of a low-affinity glucose transporter GLT-1 and two high-affi...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-021-01877-2
更新日期:2021-01-28 00:00:00
abstract:BACKGROUND:Oligocelluloses and oligoxyloses are partially hydrolyzed products from lignocellulosic biomass hydrolysis. Biomass hydrolysates usually contain monosaccharides as well as various amounts of oligosaccharides. To utilize biomass hydrolysates more efficiently, it is important to identify microorganisms capable...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/1754-6834-7-13
更新日期:2014-01-28 00:00:00
abstract:BACKGROUND:Brown algae are promising feedstocks for biofuel production with inherent advantages of no structural lignin, high growth rate, and no competition for land and fresh water. However, it is difficult for one microorganism to convert all components of brown algae with different oxidoreduction potentials to etha...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-016-0494-1
更新日期:2016-04-01 00:00:00
abstract::Editorial introduction to the thematic series on the life and lifework of Mary Mandels. ...
journal_title:Biotechnology for biofuels
pub_type: 社论
doi:10.1186/1754-6834-2-23
更新日期:2009-09-01 00:00:00
abstract:BACKGROUND:Higher ratios of syringyl-to-guaiacyl (S/G) lignin components of Populus were shown to improve sugar release by enzymatic hydrolysis using commercial blends. Cellulolytic microbes are often robust biomass hydrolyzers and may offer cost advantages; however, it is unknown whether their activity can also be sig...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-016-0445-x
更新日期:2016-02-04 00:00:00
abstract:Background:Understanding the extracellular electron transport pathways in cyanobacteria is a major factor towards developing biophotovoltaics. Stressing cyanobacteria cells environmentally and then probing changes in physiology or metabolism following a significant change in electron transfer rates is a common approach...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-020-01788-8
更新日期:2020-08-26 00:00:00
abstract:Background:α-l-Arabinofuranosidase (ARA), a debranching enzyme that can remove arabinose substituents from arabinoxylan and arabinoxylooligomers (AXOS), promotes the hydrolysis of the arabinoxylan fraction of biomass; however, the impact of ARA on the overall digestibility of cellulose is controversial. In this study, ...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-019-1412-0
更新日期:2019-03-22 00:00:00
abstract:BACKGROUND:Coordination of synthesis and assembly of the polymeric components of cell walls is essential for plant growth and development. Given the degree of co-mingling and cross-linking among cell wall components, cellulose organization must be dependent on the organization of other polymers such as lignin. Here we ...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-016-0540-z
更新日期:2016-06-17 00:00:00
abstract:BACKGROUND:Bamboo is potentially an interesting feedstock for advanced bioethanol production in China due to its natural abundance, rapid growth, perennial nature and low management requirements. Liquid hot water (LHW) pretreatment was selected as a promising technology to enhance sugar release from bamboo lignocellulo...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/1754-6834-6-173
更新日期:2013-11-29 00:00:00
abstract:BACKGROUND:Second generation hydrogen fermentation technologies using organic agricultural and forestry wastes are emerging. The efficient microbial fermentation of hexoses and pentoses resulting from the pretreatment of lingocellulosic materials is essential for the success of these processes. RESULTS:Conversion of a...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/1754-6834-5-6
更新日期:2012-02-13 00:00:00
abstract:BACKGROUND:Crude glycerol in the waste stream of the biodiesel production process is an abundant and renewable resource. However, the glycerol-based industry is usually afflicted by the cost for refinement of crude glycerol. This issue can be addressed by developing a microbial process to convert crude glycerol to valu...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-017-0857-2
更新日期:2017-07-04 00:00:00
abstract:Background:Populus (poplar) tree species including hybrid varieties are considered as promising biomass feedstock for biofuels and biochemicals production due to their fast growing, short vegetative cycle, and widely distribution. In this work, poplar was pretreated with acetic acid (AC) to produce xylooligosaccharides...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-019-1423-x
更新日期:2019-04-15 00:00:00
abstract:BACKGROUND:When producing biofuels from dedicated feedstock, agronomic factors such as harvest time and location can impact the downstream production. Thus, this paper studies the effectiveness of ammonia fibre expansion (AFEX) pretreatment on two harvest times (July and October) and ecotypes/locations (Cave-in-Rock (C...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/1754-6834-3-1
更新日期:2010-01-04 00:00:00
abstract:BACKGROUND:Production of biofuels from microalgae has been recognized to be a promising route for a sustainable energy supply. However, the microalgae harvesting process is a bottleneck for industrialization because it is energy intensive. Thus, by displaying interactive protein factors on the cell wall, oleaginous mic...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-015-0406-9
更新日期:2016-01-13 00:00:00
abstract:BACKGROUND:Microbial lipid production represents a potential alternative feedstock for the biofuel and oleochemical industries. Since Escherichia coli exhibits many genetic, technical, and biotechnological advantages over native oleaginous bacteria, we aimed to construct a metabolically engineered E. coli strain capabl...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-014-0172-0
更新日期:2014-12-24 00:00:00
abstract:BACKGROUND:Plant hemicellulose (largely xylan) is an excellent feedstock for renewable energy production and second only to cellulose in abundance. Beyond a source of fermentable sugars, xylan constitutes a critical polymer in the plant cell wall, where its precise role in wall assembly, maturation, and deconstruction ...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-016-0669-9
更新日期:2016-11-22 00:00:00
abstract:Background:Clostridium thermocellum is a promising microorganism for conversion of cellulosic biomass to biofuel, without added enzymes; however, the low ethanol titer produced by strains developed thus far is an obstacle to industrial application. Results:Here, we analyzed changes in the relative concentration of int...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-017-0961-3
更新日期:2017-11-30 00:00:00
abstract:BACKGROUND:Molasses is a dense and saline by-product of the sugar agroindustry. Its high organic content potentially fuels a myriad of renewable products of industrial interest. However, the biotechnological exploitation of molasses is mainly hampered by the high concentration of salts, an issue that is nowadays tackle...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-017-0701-8
更新日期:2017-01-31 00:00:00
abstract:BACKGROUND:Although lignin peroxidase is claimed as a key enzyme in enzyme-catalyzed lignin degradation, in vitro enzymatic degradation of lignin was not easily observed in lab-scale experiments. It implies that other factors may hinder the enzymatic degradation of lignin. Irreversible interaction between phenolic comp...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-016-0664-1
更新日期:2016-11-15 00:00:00
abstract:Background:Butyric acid is a platform chemical material, the production of which has been greatly stimulated by the diverse range of downstream applications in many industries. In particular, higher quality butyric acid used in food and medicine, is more dependent on microbiological production methods. Hence, the bio-o...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-020-01741-9
更新日期:2020-06-03 00:00:00
abstract:Background:Camelina (Camelina sativa L.) is a promising oilseed crop that may provide sustainable feedstock for biofuel production. One of the major drawbacks of Camelina is its smaller seeds compared to other major oil crops such as canola, which limit oil yield and may also pose challenges in successful seedling esta...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-018-1334-2
更新日期:2018-12-18 00:00:00
abstract:BACKGROUND:Globally, the development of a cost-effective long-term renewable energy infrastructure is one of the most challenging problems faced by society today. Microalgae are rich in potential biofuel substrates such as lipids, including triacylglycerols (TAGs). Some of these algae also biosynthesize small molecule ...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/1754-6834-7-62
更新日期:2014-04-15 00:00:00
abstract:Background:Microbial fuel cell (MFC) convokes microorganism to convert biomass into electricity. However, most well-known electrogenic strains cannot directly use glucose to produce valuable products. Zymomonas mobilis, a promising bacterium for ethanol production, owns special Entner-Doudoroff pathway with less ATP an...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-020-01672-5
更新日期:2020-03-05 00:00:00
abstract:BACKGROUND:Development of biofuels is considered as one of the important ways to replace conventional fossil energy and mitigate climate change. However, rapid increase of biofuel production could cause other environmental concerns in China such as water stress. This study is intended to evaluate the life-cycle water f...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-017-0778-0
更新日期:2017-04-18 00:00:00
abstract:Background:Biodiesel and flavor compound production using enzymatic transesterification by microbial lipases provides mild reaction conditions and low energy cost compared to the chemical process. SGNH-type lipases are very effective catalysts for enzymatic transesterification due to their high reaction rate, great sta...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-020-01696-x
更新日期:2020-03-16 00:00:00
abstract:BACKGROUND:n-Butanol can serve as an excellent gasoline substitute. Naturally, it is produced by some Clostridia species which, however, exhibit only limited suitability for industrial n-butanol production. The yeast Saccharomyces cerevisiae would be an ideal host due to its high robustness in fermentation processes. N...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-016-0673-0
更新日期:2016-11-25 00:00:00
abstract:Background:To increase the production of bioethanol, a two-step process based on hydrothermal and dilute alkaline treatment was applied to reduce the natural resistance of biomass. However, the process required a large amount of water and a long operation time due to the solid/liquid separation before the alkaline trea...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-018-1140-x
更新日期:2018-05-12 00:00:00
abstract:BACKGROUND:Inefficient carbohydrate conversion has been an unsolved problem for various lignocellulosic biomass pretreatment technologies, including AFEX, dilute acid, and ionic liquid pretreatments. Previous work has shown 22% of total carbohydrates are typically unconverted, remaining as soluble or insoluble oligomer...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-017-0757-5
更新日期:2017-03-29 00:00:00
abstract:BACKGROUND:To ensure reliable sources of energy and raw materials, the utilization of sustainable biomass has considerable advantages over petroleum-based energy sources. Photosynthetic algae have attracted attention as a third-generation feedstock for biofuel production, because algae cultivation does not directly com...
journal_title:Biotechnology for biofuels
pub_type: 杂志文章
doi:10.1186/s13068-014-0183-x
更新日期:2014-12-31 00:00:00