TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2021
·
IF 2.917
Qing SHU,Chun-fa LIAO,Wen-qiang ZOU,Bao-quan XU,Yu-hui TAN
The adsorption characteristics and mechanisms of spirulina powder were investigated when it was used as adsorbent to recover ytterbium(III) from wastewater solution. Surface structure and element valence of the adsorbent were analyzed by SEM and XPS for the exploring of its adsorption mechanism for ytterbium(III). The adsorption characteristics of ytterbium(III) on spirulina powder was analyzed through assessing adsorption isotherm, kinetics and thermodynamic models. The adsorption isotherm data were best explained by Langmuir model, and the adsorption capacity of spirulina powder for ytterbium(III) was 72.46 mg/g when adsorption temperature was 318 K. The kinetic experiment results showed that the pseudo-second order kinetic model can better simulate the adsorption process of spirulina powder to ytterbium(III), indicating that the rate-controlling step was chemical adsorption. Spirulina can be an efficient and economical ytterbium(III) recycling material, because it showed good adsorption stability and reusability from the adsorption−desorption cycle experiment results.
研究领域:
环境科学
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生物技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 20
·
IF 1.86
Bo Shi,Liang Liang,Hui Yang,Liming Zhang,Fuan He
Spirulina–poly(vinyl alcohol) (PVA)–glycerol (SPG) films with improved mechanical performance, especially tensile strength (TS) and the elongation at break (EAB), are fabricated by a casting method. The integrity, color, solubility, microstructure, thermal properties, tensile strength, and compatibility of the SPG films are assessed. SPG films became smooth, homogeneous, and flexible after plasticizing with glycerol. The presence of PVA and hydrogen bonding of PVA with glycerol and spirulina protein improves the water resistance of SPG films by decreasing water absorption of spirulina protein and decreasing water diffusion through the films. The amount of carbonaceous residues decreases from 31% to 14% because of the co-pyrolysis of spirulina, PVA, and glycerol. TS increases from 2.5 to 26 Mpa and modulus from 53 to 610 Mpa with increasing PVA content. Glycerol enhances film flexibility and EAB up to 50%. Spirulina can be composited with hydrophilic polymers to fabricate compatible, processable and thermally recyclable films with desirable mechanical performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44842.
研究领域:
材料科学
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生物工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Chunli Yu,Yao Hu,Yuqin Zhang,Wei Luo,Jing Zhang,Peilun Xu,Jun Qian,Jun Li,Jianfeng Yu,Jin Liu,Wenguang Zhou,Shengxi Shao
In industrial-scale cultivation of microalgae, salinity stress often stimulates high-value metabolites production but decreases biomass yield. In this research, we present an extraordinary response of Arthrospira platensis to salinity stress. Specifically, we observed a significant increase in both biomass production (2.58 g L −1 ) and phycocyanin (PC) content (22.31%), which were enhanced by 1.26-fold and 2.62-fold, respectively, compared to the control, upon exposure to exogenous glycine betaine (GB). The biochemical analysis reveals a significant enhancement in carbonic anhydrase activity and chlorophyll a level, concurrent with reductions in carbohydrate content and reactive oxygen species (ROS) levels. Further, transcriptomic profiling indicates a downregulation of genes associated with the tricarboxylic acid (TCA) cycle and an upregulation of genes linked to nitrogen assimilation, hinting at a rebalanced carbon/nitrogen metabolism favoring PC accumulation. This work thus presents a promising strategy for simultaneous enhancement of biomass production and PC content in A. platensis and expands our understanding of PC biosynthesis and salinity stress responses in A. platensis .
研究领域:
生物技术
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Stelgen Inkoua,Chao Li,Muhammad Rashid,Muhammad Mahboob Naeem,Shu Zhang,Wenran Gao,Mortaza Gholizadeh,Xun Hu
Spirulina platensis contains abundant nitrogen-containing organics, which might react with derivatives of cellulose/lignin during hydrothermal carbonization (HTC), probably affecting yield, property of hydrochar , and pore development in activation of hydrochar. This was investigated herein by conducting co-HTC of spirulina platensis with cellulose, lignin, and sawdust at 260 °C and subsequent activation of the resulting hydrochars with K 2 C 2 O 4 at 800 °C. The results showed that cross-condensation of spirulina platensis-derived proteins with cellulose/lignin-derived ketones and phenolics did take place in the co-HTC, forming more π-conjugated heavier organics, retaining more nitrogen species in hydrochar, reducing yields of hydrochar, making the hydrochar more aromatic and increasing the thermal stability and resistivity towards activation. This enhanced the yield of activated carbon (AC) by 7 %–20 % and significantly increased specific surface area of the AC from activation of hydrochar of spirulina platensis + lignin to 2074.5 m 2 /g (859.3 m 2 /g from spirulina platensis only and 1170.1 m 2 /g from lignin only). Furthermore, more mesopores from activation of hydrochar of spirulina platensis + cellulose (47 %) and more micropores from activation of hydrochar of spirulina + sawdust (93 %) was generated. The AC from spirulina platensis + lignin with the developed pore structures generated sufficient sites for adsorption of tetracycline from aqueous phase and minimized steric hindrance for mass transfer with the abundant mesopores (43 %).
研究领域:
生物工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
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2025
·Vol. 15
·期 18
·14072-14078
·
IF 4.6
Beixiao Zhang,Gul Muhammad,Liya Deng,Md Asraful Alam,Anqi Zhao,Thomas O. Butler,Zhenglong Li,Ximing Zhang,Jingliang Xu
Microalgae biomass is regarded as a potential feedstock for valuable compounds such as pigments, lipids and proteins. However, development of single molecule extraction processes is the most common practice. A green multiproduct extraction approach is needed for economically sustainable process development of the microalgal industry. Therefore, this study aims to investigate the sequential extraction of lutein and lipid from dry and wet Chlorella pyrenoidosa biomass pretreated with a choline chloride-based deep eutectic solvent (DES) under a sustainable biorefinery scheme. In this context, we have assessed the kinetic modeling of the solid–liquid extraction process for the aforementioned compounds, focusing on the effects of temperature and time. The maximum lutein (3.80 mg g−1) and lipid (95.0 mg g−1) contents from dry biomass were obtained at 45 °C in 40 min and at 70 °C in 90 min, respectively. From wet biomass, the maximum lutein (2.57 mg g−1) and lipid contents (87.47 mg g−1) were obtained at 35 °C in 40 min and at 70 °C in 90 min, respectively. The kinetics of the solvent-based extraction process for lutein and lipids were assessed via first-order and second-order kinetic models with an associated investigation of kinetic parameters, such as rate constants, saturation concentration and activation energies. We found that temperature is an important parameter that influences the extraction of all compounds and also has a significant impact on the kinetic parameters. Toxicity evaluation of the DES and economic assessment of DES vs. ionic liquids (ILs) were performed. The synthesis cost of the DES is lower than that of ILs, and Escherichia coli JM109 survivability assessment confirms the DES as a non-toxic solvent. The present study provides valuable insights into the sequential extraction for a high-value multiproduct biorefinery.
研究领域:
生物技术
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可再生资源与环境
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Ruihan Dong,Ziyue Tang,Yang Yang,Yingquan Chen,Xianhua Wang,Wei Cheng,Haiping Yang,Hanping Chen
The thermodynamics and kinetics effects of activators on the simultaneous activation pyrolysis of microalgae remain unclear. This study addresses this gap by investigating the effects of activators (KOH, KHCO 3 , CH 3 COOK, K 2 CO 3 ) on Spirulina platensis (SP) pyrolysis using thermogravimetric-Fourier transform infrared spectrometer (TG-FTIR) and isoconversion methods. The results showed that all activators reduced the initial decomposition temperature of SP, leading to the earlier release of volatile pyrolysis products. Kinetics analysis further revealed that the addition of activators lowered the apparent activation energy ( E α ) in the initial pyrolysis stage of SP. However, as the devolatilization process transitioned to the charring stage, the E α gradually increased, surpassing that of SP pyrolyzed alone. Thermodynamic analysis indicated that the carbonization process of microalgae in the presence of activators required higher energy absorption. These findings reveal the mechanisms of activators in microalgae pyrolysis and provide insights into biochar production.
研究领域:
能源与环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2023
·
IF 4.1
Yanghao Meng,Hongbiao Du,Shuai Lu,Yanwei Liu,Jinglai Zhang,Hualong Li
Hydrothermal liquefaction (HTL) is one of the most promising technologies for biofuel production. The preparation and application of catalysts for HTL have been the research focus in recent years. In this study, a new synergistic catalytic process strategy is proposed. CuO–CeO2/γ-Al2O3 was used as an in situ hydrogen donor catalyst and Ni–Co/SAPO-34 was synthesized for hydroprocessing to improve bio-oil production process. The results of XRD and XPS demonstrated that the metal components were well supported on the catalyst. When the two catalysts were mixed, the yield of bio-oil increased from 51.00% to 64.51%, the carbon recovery rate raised from 69.53% to 88.18%, the energy recovery rate grew from 63.42% to 80.22%, and the S content is relatively reduced by 83.3%. Also, TG analysis showed that the content of light components in bio-oil increased. Moreover, the hydrocarbons and alcohols were observed to a higher proportion from the GC-MS analysis. This new method still has high catalytic activity after repeated use for five times. This study provides a new idea for preparing higher yield and superior quality bio-oil.
研究领域:
能源生物学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Benke Cui,Chunguang Ren,Renlong Zhang,Yuhang Ren,Jiaxin Liu,Yanzhe Gou,Tianyu Zhao,Xue Jiang,Hongli Cui,Xiuzhi Wang,Linlin Wang
Hypoxia can prolong the healing time of wounds and oxygen delivery to the hypoxic tissue has been reported an effective strategy for promoting wound regeneration. Bacterial infections can interfere with the wound healing process, leading to poor skin regeneration and even more serious complications, which is also an urgent issue to be solved during the process of wound healing. To address the problem of delayed wound healing caused by hypoxia and bacterial infections, we fabricated a series of Chlorella -loaded hydrogels (CK) using gelatin, κ-carrageenan and I-carrageenan as matrixes, which introduced Chlorella and ampicillin conferred oxygen-producing and antimicrobial capacity to the hydrogel. The CK hydrogels possessed good mechanical and adhesive properties, as well as the capability of efficient and sustained oxygen release. The hydrogels possessed outstanding hemostatic ability, excellent blood and cell compatibility, which also owned excellent antibacterial capacity against E. coli and S. aureus . More notably, the in vivo evaluation revealed that the hydrogel can accelerate wound healing by promoting collagen deposition, which may as a promising potential wound dressing for hypoxic wound healing.
研究领域:
生物材料学
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医学工程
·
再生医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2024
·
IF 9
Mengjiao Fan,Xueming Gao,Yuewen Shao,Kai Sun,Yuchen Jiang,Shu Zhang,Yi Wang,Song Hu,Jun Xiang,Xun Hu
High nitrogen content in Spirulina platensis -derived bio-oil is a highly undesirable feature in upgrading of bio-oil to biofuel via hydrodeoxygenation . However, the nitrogen species could be potentially used as dopant for tailoring the catalytic behaviors of metallic sites in heterogeneous catalysts . In this study, the nitrogen species in the bio-oil from hydrothermal carbonization (HTC) of Spirulina platensis was used to modify Co-based catalyst for enhancing their catalytic activity for hydrogenation of o -chloronitrobenzene ( o -CNB). The results showed that the introduction of N species not only promoted dispersion of Co particles via formation of Co–N sites, but also generated extra pores and significantly increased H 2 uptake. The abundant Co–N sites, high dispersion of Co and higher surface area of N-doped catalyst (CoFeAl–N) jointly contributed to the enhanced catalytic activity for hydrogenation of o -CNB, achieving the yield of 90.3% for o -chloroaniline ( o -CA) and lowering the activation energy from 63.0 kJ mol −1 (with N-free CoFeAl catalyst) to 55.1 kJ mol −1 . The effectiveness of introducing nitrogen for enhancing catalytic activity for hydrogenation of o -CNB was also confirmed in the experiments for doping Co/Al 2 O 3 (prepared via impregnation) and CoAl (prepared via co-precipitation) catalysts with the Spirulina platensis derived bio-oil.
研究领域:
生物化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 19
·15830-15838
·
IF 3.201
Bo Shi,Liming Zhang,Liang Liang,Jianfeng Ban
Hydrophilicity, pores with interconnected structures, and degradability are important properties of tissue engineering scaffolds. The degradability after introducing spirulina extract (SP-E) to polycaprolactone (PCL) via particulate leaching to obtain SP-E/PCL scaffolds was characterized on the basis of their porosity, hydrophilicity, water absorption capacity, and degradability. Microscopy analysis showed that the pore sizes were in the range of 250–300 μm including small interconnected pores within large pores because of some SP-E leaching out during the fabrication process. The hydrophilicity of the SP-E/PCL scaffold was considerably enhanced by introducing SP-E. The water contact angles of the SP-E/PCL scaffold decreased from 120° to 65° at 2 s followed by further decrease to 0° at 7 s. The water absorption capacity increased from 2.5 to 8.5 times the original weight. SP-E/PCL scaffolds quickly degraded with increasing amounts of SP-E, and the percentage of weight loss increased from 2.2% (PCL scaffold) to 29.2% (20 wt% SP-E/PCL scaffold) after immersion in PBS for 25 d because of the co-degradation of SP-E and PCL. The molecular weight of SP-E/PCL-20 changed slightly after only 28 d degradation. The hydroxyl groups of the degraded SP-E/PCL-20 specimen were formed after 28 d. Moreover, the number of micropores formed on the surface of the scaffold after immersion in PBS for 25 d increased with increasing amounts of SP-E. Using SP-E as a secondary phase improved porosity, interconnectivity, hydrophilicity, and water absorption capacity and caused accelerated degradation between SP-E and PCL. These findings suggest that SP-E/PCL scaffolds have potential applications in tissue engineering.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
DOI
高影响因子
Bioresources and Bioprocessing
·
2021
·Vol. 8
·期 1
·1-9
·
IF 4.578
Ma Jun,Zeng Xiankun,Zhou Min,Cheng Le,Ren Difeng
Spirulina platensis protein hydrolysates were prepared by digesting protein extracts with papain, and the hydrolysates were separated into 30, 10, and 3 kDa weights using membrane ultrafiltration. The 0–3 kDa low-molecular-weight Spirulina peptides (LMWSPs) proved the highest chemical antioxidant activity by 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging ability, hydroxyl radical (·OH) scavenging activities and total antioxidant capacity. Cellular antioxidant ability of LMWPs fractions against 2000 μg/mL H2O2 induced oxidative damage of L02 cells were investigated. The MTT assay results displayed that LMWSPs at different concentrations (0–1000 μg/mL) had proliferation effect on the L02 cells and that treatment of the L02 cells with the 1000 μg/mL LMWSPs (0–3 kDa) significantly prevented H2O2-induced oxidative damage compared with control cells. Moreover, the 2′,7′-dichlorofluorescein diacetate (DCFH-DA) fluorescent probe assay showed that the levels of ROS and NO were significantly lower in the experimental group that was treated with the peptides for 24 h than in the control group. Furthermore, using the corresponding kits, the treatment inhibited the reduction of SOD activity and the increase of MDA contents in the L02 cells. Therefore, LMWSPs (0–3 kDa) may have potential applications in antioxidant and liver health products.
研究领域:
营养学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Hongwei Pang,Yanping Feng,Xinru Ma,Qirong Yang,Zhaoying Li
The intensification of environmental pollution and significant consumption of fossil fuels has led to widespread attention on developing renewable resources. As a carbon-containing renewable energy source, Spirulina is characterized by its fast growth cycle and wide distribution. Currently, one of the research hotspots is the conversion of Spirulina into bio-oil through hydrothermal liquefaction. However, studies on the two-stage hydrothermal liquefaction of Spirulina predominantly concentrate on the product yield or composition. There is relatively little research on thermodynamic (energy) analysis and techno-economic assessment during the reaction process. The main bio-oil components from two-stage hydrothermal liquefaction of Spirulina are ketones and acids with 44.9 % and 34.1 %, respectively. Compared to no-catalysis, two-stage hydrothermal liquefaction of Spirulina over HZSM-5, alkili-modified HZSM-5, and Ni@alkali-modified HZSM-5 increase the relative content of hydrocarbons to 6.6 %, 32.9 % and 48.1 %, respectively. Energy analysis and techno-economic assessment are conducted with Aspen Plus simulation, revealing a exergy efficiency of 56.4 % for the catalytic two-stage hydrothermal liquefaction of Spirulina compared with 43.6 % over no-catalyst. The primary losses occur in the first stage of the reaction process (248.6 kW) and the cooling process (10.7 kW) for catalytic two-stage hydrothermal liquefaction of Spirulina . The hourly price of producing 1 kg bio-oil with a catalyst is $3.67, while without a catalyst, it is $4.54 kg −1 ; obtaining a unit of chemical exergy costs $0.14×10 −3 kJ −1 through catalysis. Moreover, the fluctuations in the prices of sulfuric acid and catalysts are most sensitive to the cost price of bio-oil with or without catalysts in the two-stage hydrothermal liquefaction process, with the values being 10.06 % and 8.10 %. This study has important significance for efficient transformation and energy utilization of Spirulina .
研究领域:
能源生物学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）