Journal of chemical technology and biotechnology最新文献

{"title":"Evaluation of green microalgal strains for simultaneous municipal wastewater treatment and heavy metal bioremediation","authors":"Elvis Kodzo Ahiahonu,&nbsp;William Wilson Anku,&nbsp;Ashira Roopnarain,&nbsp;Mahloro Hope Serepa-Dlamini,&nbsp;Penny Poomani Govender","doi":"10.1002/jctb.7705","DOIUrl":"10.1002/jctb.7705","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Microalga-assisted wastewater treatment systems have gained attention for their efficiency in removing nutrients, chemical oxygen demand, toxic heavy metals and other dissolved compounds, while also producing valuable biomass and demonstrating high CO₂ biofixation potential. The current research focuses on investigating the municipal wastewater phycoremediation and heavy metal biosorption ability of three indigenous freshwater microalgal strains: <i>Tetradesmus reginae</i>, <i>Tetradesmus obliquus</i> and <i>Chlorella sorokiniana.</i></p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The research findings indicate that the microalgal strains <i>T. reginae</i>, <i>T. obliquus</i> and <i>C. sorokiniana</i> exhibited notable performance in biomass accumulation. Specifically, the biomass accumulations were 2.215 ± 0.002, 1.143 ± 0.006 and 0.856 ± 0.021 g L⁻¹, respectively, with initial culture biomasses ranging from 0.5 to 0.6 g L⁻¹. These strains significantly reduced toxic heavy metals (As, 46.86–60.12%; Cd, 52.96–83.18%; Cr, 73.49–82.18%; and Pb, 95.38–96.25%), nutrients (NH₄⁺ &amp; NO₃⁻ 100% and PO₄³⁻ 78–86.41%) as well as chemical oxygen demand (46.02–67.35%), and biosequestered CO₂ (0.8–0.18 gCO₂ L⁻¹ d⁻¹) during the growth period. Among the strains, <i>T. reginae</i> emerged as the top performer. The Fourier transform infrared spectra of the strain's biomass confirmed the presence of specific functional groups, such as <span></span>CH, <span></span>NH, <span></span>OH and <span></span>CN, which play a crucial role in ionising and reacting with toxic metal ions and protons in the wastewater.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>This study has shown that the isolated wild microalgal strains have promising phycoremediation and heavy metal adsorption characteristics. Moreover, they exhibit promising rates of CO₂ biosequestration. These findings underscore the potential of microalga-assisted wastewater treatment systems for efficient and eco-friendly wastewater remediation, as well as biomass generation and CO₂ mitigation. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adsorption of bimetal from aqueous solution on plum seed activated carbon synthesized by pyrocarbonic acid microwave method","authors":"Sami D Salman,&nbsp;Israa M Rashid,&nbsp;Yussur D Abdulwahab","doi":"10.1002/jctb.7708","DOIUrl":"10.1002/jctb.7708","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>This article presents the simultaneous adsorption of bimetal Cu²⁺ and Zn²⁺ from an aqueous solution using activated carbon synthesized from a plum seed precursor by sulfuric acid and microwave activation: plum seeds chemically activated by 45% (w/w) sulfuric acid with 2:1 ratio for 4 h, then carbonized for 2 h at 700 °C and the product obtained activated in a microwave oven for 20 min at 700 W for final of activation. Plum seeds and activated carbon produced were characterized in terms of their physical and chemical composition using Brunauer–Emmett–Teller measurements, field emission scanning electron microscopy and Fourier transform infrared spectroscopy. The effects of absorption time, bimetal solution pH, bimetal concentration and dosage of activated carbon on the capacity of adsorption and removal efficiency were studied with Design-Expert software using response surface methodology with the I-optimal method for experimental data analysis.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The results showed that the statistical analysis of Cu²⁺ and Zn²⁺ removal efficiency followed the quadratic models generated by Design-Expert software with significant <i>P</i> value (<i>P</i> &lt; 0.0001) and the optimum values of removal efficiencies were 99.9268% for Cu²⁺ and 99.34% for Zn²⁺ at an adsorption time of 4.98 h, pH of 7.94, bimetal concentration of 38.467 mg L⁻¹ and adsorbent dose of 1485.294 mg (100 mL)⁻¹. The equilibrium adsorption data were analyzed by Langmuir and Freundlich isotherm models and there was a significant agreement in the results with the Freundlich model with <i>R</i>² = 0.9841 for Cu²⁺ and <i>R</i>² = 0.9927 for Zn²⁺. Likewise, the data were found to fit with a pseudo-second-order model with <i>R</i>² = 0.9989 for Cu²⁺ and <i>R</i>² = 0.9948 for Zn²⁺ as compared to a pseudo-first-order model.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>Activated carbon synthesized from plum seeds with chemical and microwave activation could be effectively used as an adsorbent for bimetal Cu²⁺ and Zn²⁺ in aqueous solution. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antimicrobial framework nucleic acid-based DNAzyme cluster with high catalytic efficiency","authors":"Noshin Afshan,&nbsp;Ruba Tariq,&nbsp;Iqra Riaz,&nbsp;Abdul Manan,&nbsp;Azhar Iqbal,&nbsp;Muhammad Ejaz,&nbsp;Amir Sohail,&nbsp;Alina Bari,&nbsp;Sajid Mahmood,&nbsp;Shahid Iqbal,&nbsp;Khalid M Alotaibi,&nbsp;Matar Alshalwi","doi":"10.1002/jctb.7703","DOIUrl":"10.1002/jctb.7703","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Hydroxyl radical-mediated materials primarily liberate more reactive and acutely lethal hydroxyl radical (^•OH) and act as potent bactericidal antibiotics, for example H₂O₂. Hydroxyl radical possess higher tendency than that of H₂O₂ to attack various biological molecules such as DNA, proteins and iron–sulfur clusters, and impair their proper functioning, actively leading to strongly potent bactericidal effect. To acquire the desired antimicrobial effect, high concentration of H₂O₂ is required that has found medically harmful to healthy tissues of humans.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>We herein report framework nucleic acid-regulated DNAzyme cluster (FDC) – that is, peroxidase-like hemin-bound G-quadruplex (G4/H) DNAzyme – to amplify the catalytic reduction potential of G4/H complex, leading to high conversion rate of H₂O₂ to more reactive hydroxyl radical that potentially shows the same antibacterial efficiency at lower and safer H₂O₂ concentration. Specifically, we have grafted multiple copies of DNAzymes outside framework nucleic acid (FNA) to successively achieve 3–9 orders of magnitude enhancement in catalytic activity and antibacterial efficiency of FDC.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>Our designed FDC has successfully alleviated H₂O₂ toxicity and increased its efficiency as antibacterial material, as FDC amplified the catalytic reduction potential of G4/H DNAzyme, leading to high conversion rate of H₂O₂ to more reactive ^•OH that potentially shows the same antibacterial efficiency at lower and safer H₂O₂ concentration. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phosphate buffer-driven precursor polycondensation to promote fermentative humification","authors":"Jiabin Li,&nbsp;Yunlong Zhang,&nbsp;Xiufen Li","doi":"10.1002/jctb.7706","DOIUrl":"10.1002/jctb.7706","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Aerobic fermentation always suffers from nitrogen loss and low humification degree. The objective of this study was to investigate the promotion of phosphate buffer on organic matter degradation and precursor polymerization into humus (HS) in aerobic fermentation, and to analyze the key roles played by different precursors. In order to achieve this, sludge aerobic fermentation tests were conducted on control (CK), phosphate buffer addition treatment (KP) and potassium chloride addition treatment (K).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The HS content of KP treatment exhibited a notable increase compared to the CK and K treatments, with a maximum increase of 38.29%. In addition, phosphate addition improved the nitrogen retention capacity and the complexity of the HS structure. Phosphate buffer enhanced both the polyphenol and Maillard humification pathways by promoting the condensation of precursors (polysaccharides, reducing sugars, polyphenols, amino acids and proteins). Among these precursors, reducing sugars, amino acids and proteins were identified as the key driving precursors of phosphate.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSIONS</h3>\u0000 \u0000 <p>Phosphate, as an exogenous additive to the fermentation system, reduces nitrogen loss while promoting precursor polymerization to form HS, which benefits the improvement of soil fertility and crop growth upon organic fertilizer application. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetically separable spent coffee grounds as a potential novel support for the covalent immobilization of β-glucosidase for cellobiose hydrolysis","authors":"Shaifali Bhardwaj,&nbsp;Ankit Mishra,&nbsp;Debashish Ghosh,&nbsp;Anil Kumar Sinha","doi":"10.1002/jctb.7700","DOIUrl":"10.1002/jctb.7700","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>The industrial-scale application of enzymes faces obstacles due to elevated costs and difficulties in stability and reuse. In this study, magnetic spent coffee grounds, an ecotoxic waste, have been utilized successfully for the first time to immobilize <i>β</i>-glucosidase to overcome these challenges.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The spent coffee grounds were magnetized and amine-functionalized, followed by characterization using various techniques. Under optimized conditions, forming an imine bond between the functionalized support and <i>β</i>-glucosidase resulted in a 62% immobilization yield (92.81 mg g⁻¹ enzyme loading) and 12.5 U mg⁻¹ activity after immobilization. A relatively small kinetic change was observed in the <i>K</i>_m value (902 to 946 μmol L⁻¹) after immobilization, suggesting minimal hindrance by AMSCG₃ on substrate access or product release. Moreover, Glu@AMSCG₃ showed exceptional stability (&gt;90% residual activity) within a pH range of 3 to 6 after 2 h of incubation at 25 °C. A residual activity of 87.94% was maintained even at 80 °C and pH 5 after 2 h of incubation compared to the free <i>β</i>-glucosidase, which showed only 6.5% residual activity at the same temperature. When cellobiose was hydrolyzed using Glu@AMSCG₃ under optimum conditions, 91.33% cellobiose conversion was achieved initially, and over 79% conversion was maintained for 10 reusability cycles.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The improved stability of <i>β</i>-glucosidase after covalent immobilization on amine-modified magnetically separable spent coffee grounds indicates their potential as a support matrix for application in enzyme immobilization. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Concentration of betanin from model beetroot extracts by using nanofiltration: parameter estimation and sensitivity analysis","authors":"Ashwani Kumar Tiwari,&nbsp;Manish Jain","doi":"10.1002/jctb.7698","DOIUrl":"10.1002/jctb.7698","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Nowadays, research focusing on natural compounds is getting more importance across the globe. Recently, natural bioactive compounds have gained the attention of researchers as a consequence of their exemplary physicochemical properties and exceptional utility in the food and pharma industries. However, separating and concentrating these bioactive compounds from their origin sources still poses a considerable challenge to their profitable commercial usage. The current study focuses on the application of a facile nanofiltration method for recovering betanin from model beetroot extract solutions using a polyamide nanofiltration membrane. Furthermore, the three-parameter Spiegler–Kedem model was used to determine the transport parameters of the membrane and theoretically predict the performance of the membrane. Additionally, variance-based sensitivity analysis methods were deployed to study the sensitivity of different operating and membrane transport parameters.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULT</h3>\u0000 \u0000 <p>The results indicate that the membrane exhibited the highest rejection of 99% and permeate flux of 3.14 ⨯ 10⁻⁵ m³ m⁻² s⁻¹ at 0.6 MPa pressure and 600 mL min⁻¹ flow rate. The data obtained through the Spiegler–Kedem model were coherent with the experimental observations. Simulations on sensitivity analysis revealed that specific hydraulic permeability and cross-membrane pressure majorly influence permeate flux and rejection.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>This study showed that nanofiltration with 150 Da cut-off membranes effectively concentrated betanin with 99% rejection. Higher cross-membrane pressure and higher feed flow rates were preferable operating conditions for higher rejections. Variance-based sensitivity analysis showed that cross-membrane pressure and hydraulic permeability are the most influential parameters affecting permeate flux and rejection. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Treatment of textile industry effluents with up-flow anaerobic sulfidogenic reactor","authors":"Gülayşe Özkaymak,&nbsp;Aybüke Nur Şahan,&nbsp;Elif Yakamercan,&nbsp;Yakup Çakmak,&nbsp;Deniz Uçar","doi":"10.1002/jctb.7699","DOIUrl":"10.1002/jctb.7699","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Dyes present in textile wastewater can pose various environmental problems, including toxicity, carcinogenicity and mutagenicity, when released into receiving environments. Sulfidogenic bacteria play a crucial role in wastewater treatment by reducing sulfate and producing sulfide through the utilization of organic compounds in water. The resulting sulfide often transfers its electrons to another electron acceptor. This study focused on the treatment of real textile wastewater using an up-flow sulfidogenic column bioreactor.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The reactor was acclimated to sulfate-reducing conditions when influent chemical oxygen demand and sulfate concentrations were 1742 and 2000 mg L⁻¹, respectively. Subsequently, a gradual transition was made from sulfate-reducing conditions to dye-reducing conditions. Throughout the study, the hydraulic retention time was maintained at 1 day.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The influent dye concentration was 2722 Pt-Co, and an impressive dye removal efficiency of approximately 90 ± 2% was achieved. This corresponds to a removal rate of 2450 Pt-Co L⁻¹ day⁻¹. Although the sulfide concentration in the reactor decreased in the last period, investigating the extent to which this sulfide participates in the dye removal may expand the use of sulfidogenic reactors in the treatment of real textile industry wastewater. © 2024 The Author(s). <i>Journal of Chemical Technology and Biotechnology</i> published by John Wiley &amp; Sons Ltd on behalf of Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jctb.7699","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance of iron – doped activated carbon synthesised from cocoa husk as a cathode catalyst in microbial fuel cell powered Fenton process","authors":"Juliana John,&nbsp;Karnapa Ajit,&nbsp;Haribabu Krishnan,&nbsp;Ahammed Sherief Kizhakkethil Youseph","doi":"10.1002/jctb.7697","DOIUrl":"https://doi.org/10.1002/jctb.7697","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Bio-electro-Fenton (BEF) systems, specifically microbial fuel cell (MFC) driven electro-Fenton (EF) systems, have gained significant attention in wastewater treatment in recent years. The role of the cathode catalyst in BEF is crucial, as it undergoes O₂ reduction via a 2e⁻ oxygen reduction reaction (ORR) to produce H₂O₂. In this study, we have harnessed the abundant lignocellulosic composition of cocoa pod husk (CPH) to prepare a novel iron-doped heterogeneous Fenton catalyst for the BEF system. Cocoa is typically grown for its wet beans, which constitute only one third of cocoa fruit by weight, while CPH makes up about two-thirds of the weight and is often discarded as by-product or waste. As a result, approximately 10 million tons of CPH are produced globally each year, highlighting the potential for transforming it into a value-added product. To date, CPH has been utilised as a natural fertiliser, soil amendment, biomass fuel, poultry and livestock feed ingredient, and more.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The presence of mesoporous structure, iron content, oxygen containing functional groups, and prominent reduction peaks in cyclic voltammetry validated the Fe-doped cocoa husk biochar's (Fe-CHB) potential to act as an ORR catalyst. The BEF system achieved an open circuit voltage, current, and power densities of 0.697 V, 0.15 A/m², and 0.040 W/m², respectively, at an optimum resistance of 350 Ω. Optimisation of the process parameters using RSM and ANN predicted maximum dye removal efficiencies of 93.34% and 92.45%, respectively, at dye and substrate concentrations of 10 mg/L and 1 g/L. These predictions closely aligned with the experimental findings of 92.5%.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The synthesised catalyst provided large surface area, electrical conductivity, superior ORR catalytic efficiencies, and ample sites for H₂O₂ activation. Hence, Fe-CHB can serve as a highly effective electrocatalyst in BEF systems. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of a magnetic solid acid Fe3O4@PS-SO3H and its use in hydrolysis of cellulose","authors":"Mengmeng Liu,&nbsp;Zhen Liu,&nbsp;Linghui Qiao","doi":"10.1002/jctb.7696","DOIUrl":"https://doi.org/10.1002/jctb.7696","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>In order to improve the catalytic performance and stability of magnetic solid acid for cellulose hydrolysis in the aqueous phase, this study first modified the surface of magnetite (Fe₃O₄) nanoparticles (NPs) with oleic acid. Then, in an oil-in-water (O/W) emulsion system, polystyrene (PS) was coated on the Fe₃O₄ NPs through emulsion polymerization. Finally, magnetic solid acid Fe₃O₄@PS-SO₃H was prepared by sulfonation.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The obtained Fe₃O₄@PS-SO₃H was characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, infrared, X-ray diffraction, X-ray photoelectron spectroscopy and thermogravimetric analysis, and its acid densityand magnetic properties determined. Applied to cellulose hydrolysis, it exhibited 35.28 emu·g⁻¹ saturation magnetization and 3.56 mmol·g⁻¹ maximum acid density. At 140 °C and 1:1 acid to substrate ratio, cellulose hydrolysis with Fe₃O₄@PS-SO₃H gave a glucose yield of ≤64.14% in 10 h. The solid acid was conveniently recycled with a magnet and reused for further cellulose hydrolysis. It maintained good catalytic activities after five cycles.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The magnetic solid acid with a polystyrene backbone prepared by emulsion polymerization exhibits efficient and stable catalytic performance, in line with the trend of green development in ‘bio-refining’, and lays the foundation for the development of composite solid acids. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141584002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of an efficient process to extract C-phycocyanin from marine cyanobacterial strains and evaluation of its bioactive potential","authors":"Mahammed Ilyas Khazi,&nbsp;Zeliha Demirel,&nbsp;Fakhra Liaqat,&nbsp;Rengin Eltem,&nbsp;Meltem Conk Dalay","doi":"10.1002/jctb.7693","DOIUrl":"10.1002/jctb.7693","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Phycocyanin (PC), a natural blue photosynthetic pigment found in cyanobacteria, rhodophyta and cryptophyta has numerous applications in biotechnology and the food industry. The phycocyanin extraction method has a significant impact on its bioactivities, purity index, cost and potential applications; thus, the development of an efficient extraction strategy continues to be a primary research goal.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>This study evaluated the efficacy of different methods for the extraction of cyanobacterial phycocyanin (C-PC) from three marine cyanobacterial isolates, namely <i>Arthrospira platensis</i>, <i>Phormidium</i> sp. and <i>Pseudoscillatoria</i> sp. wet biomass. The pretreatment step of soaking biomass in extraction buffer for 60 min, followed by a combination of freeze–thaw (one cycle; 2 h) and sonication (2 min) treatment was found to be the most effective extraction strategy, producing the highest C-PC yield (16.19 ± 0.34%, 15.89 ± 0.61% and 15.56 ± 0.69% dry cell weight for strains <i>A. platensis</i>, <i>Phormidium</i> sp. and <i>Pseudoscillatoria</i> sp., respectively). Furthermore, a biomass-to-solvent ratio of 0.02 g mL⁻¹ was optimal to attain food-grade purity ((<i>A</i>₆₂₀/<i>A</i>₂₈₀) ≥ 0.7). Bioactivity evaluation of crude and purified C-PC exhibited its potential as antioxidant compounds and as an antimicrobial agent with significant inhibitory effects against various pathogenic microorganisms.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The study proposed an efficient and cost-effective C-PC extraction process for cyanobacteria and highlighted the potential of C-PC as a valuable bioactive compound with various applications. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141340951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}