New Journal of Chemistry最新文献

{"title":"A highly selective mercury ion electrochemical detection based on the enhancement of oxidase-like activity by mercury on electrodeposited palladium nanoparticles@reduced graphene oxide","authors":"Zhiguang Liu, Miaomiao Li, Xiaofang Zheng, Xiaolin Jia and Yujing Guo","doi":"10.1039/D4NJ04023F","DOIUrl":"https://doi.org/10.1039/D4NJ04023F","url":null,"abstract":"<p >As the toxic mercury ions (Hg<small>²⁺</small>) widely present in rivers and soil threaten human health, it is essential to develop various methods to detect and monitor Hg<small>²⁺</small>. At present, increasing numbers of nanozymes with peroxidase-like or oxidase-like activity have been exploited to develop the colorimetric detection of Hg<small>²⁺</small>. However, research on the electrochemical detection of Hg<small>²⁺</small> by nanozymes is still rarely reported. Herein, on the basis of our previous research on palladium-based nanozymes with oxidase-like activity, graphene and palladium nanoparticles (PdNPs) were electrochemically deposited on the electrode surface. Then, the enhancement effect of palladium–mercury binding on the oxidase-like activity of electrodeposited PdNPs was studied for the first time. Moreover, it was found that only Hg<small>²⁺</small> can enhance the catalytic oxidation of TMB compared to other common metal ions. Based on these properties, a highly selective, convenient and eco-friendly electrochemical Hg<small>²⁺</small> sensor has been successfully developed, which has a wide linear range of 1.0–40 μM and a low LOD of 0.33 μM. Additionally, the proposed method shows acceptable recovery in real sample tests, indicating promising prospects in the field test and water pollution monitoring of Hg<small>²⁺</small>.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 1","pages":" 28-37"},"PeriodicalIF":2.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrodeposition of ultrathin NiBDC lamellar arrays as a novel binder-free electrode for flexible all-solid-state supercapacitors†","authors":"Yue Feng, Mingji Wu, Haiyan Zhu, Huirong Bao, Cheng Wang, Xiujing Lin, Ruiqing Liu and Xiaomiao Feng","doi":"10.1039/D4NJ04206A","DOIUrl":"https://doi.org/10.1039/D4NJ04206A","url":null,"abstract":"<p >The Ni-based metal–organic framework (Ni-MOF) shows significant potential for energy storage due to its high specific capacity and active sites for electrochemical reactions. This study investigates the microstructural control of NiBDC on indium tin oxide/polyethylene terephthalate (ITO/PET) by varying the electrodeposition time (NiBDC/ITO/PET). The resulting microstructure exhibits a well-ordered and uniform porous array, with NiBDC nanosheets growing into ultra-thin layers of 50 nm thickness. As an electrode material for flexible, binder-free all-solid-state supercapacitors, the NiBDC/ITO/PET electrode demonstrates optimal electrochemical performance at an electrodeposition time of 30 minutes. In a three-electrode configuration, the NiBDC/ITO/PET electrode material achieves an areal capacitance of 72.2 mF cm<small>⁻²</small> at a discharge current density of 50 μA cm<small>⁻²</small>. Even after 2000 cycles, it retains over 90% of its initial capacity at a current density of 500 μA cm<small>⁻²</small>. The resultant symmetric supercapacitor device exhibits remarkable mechanical flexibility and robust cycling stability, maintaining over 87.8% of its initial specific capacitance after 5000 cycles. Moreover, three such devices connected in series can power a light-emitting diode (LED), demonstrating practical energy storage applications.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 1","pages":" 263-272"},"PeriodicalIF":2.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrated and fluorinated potassium scandium phosphates: topology symmetry analysis and structure prediction†","authors":"Anastasia P. Topnikova, Elena L. Belokoneva, Olga V. Dimitrova, Anatoly S. Volkov, Sergey Yu. Stefanovich, Viktor V. Maltsev and Leokadiya V. Zorina","doi":"10.1039/D4NJ04229H","DOIUrl":"https://doi.org/10.1039/D4NJ04229H","url":null,"abstract":"<p >Two centrosymmetric modifications of a hydrated phosphate KSc(HPO<small>₄</small>)<small>₂</small> (<em>Pnam</em> and <em>P</em>12<small>₁</small>/<em>c</em>1) and two polar modifications of a fluorinated phosphate K<small>₃</small>Sc<small>₃</small>(P<small>₃</small>O<small>₁₀</small>F<small>₂</small>)F<small>₅</small> (<em>Cmc</em>2<small>₁</small> and <em>I</em>1<em>a</em>1) were synthesized hydrothermally in the temperature range of 280–290 °C and in the pressure range of 80–100 atm. Phosphate KSc(HPO<small>₄</small>)<small>₂</small> demonstrates phase transition from unknown orthorhombic at room temperature to known monoclinic at low temperature isostructural to several Sc-phosphates with Rb, Cs, and NH<small>₄</small>. Orthorhombic K<small>₃</small>Sc<small>₃</small>(P<small>₃</small>O<small>₁₀</small>F<small>₂</small>)F<small>₅</small> is isostructural to K<small>₃</small>Fe<small>₃</small>(P<small>₃</small>O<small>₁₀</small>F<small>₂</small>)F<small>₅</small>, monoclinic – resembles a recently investigated compound. Detailed topology symmetry analysis using OD-theory carried out for polar fluorinated Sc-phosphates allowed separating a common layer with a local trigonal symmetry <em>P</em>31<em>m</em>. Close polytypic relations are described and a series of hypothetical structures in the unit family are predicted. Under Nd:YAG laser illumination, powders of acentric fluorophosphates demonstrate second harmonic light emission (SHG). Determination of optical nonlinearity was fulfilled for orthorhombic and monoclinic fluorine-phosphate modifications using SHG from extremely dispersed powders with grains 3–5 mcm. The second harmonic outputs 2.5 and 1.2 compared to those of the α-quartz powder under the same conditions correspond to space-averaged nonlinear optical coefficients 〈<em>d</em>〉 = 0.55 and 0.38 pm V<small>⁻¹</small> for these two acentric modifications, respectively.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 48","pages":" 20375-20383"},"PeriodicalIF":2.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A porous Co3Mo3N/N-doped carbon electrocatalyst derived from Mo–Co MOFs for the electrochemical hydrogen evolution reaction†","authors":"P. Mohana, R. Yuvakkumar, G. Ravi, A. Arun, S. Arun Metha and P. Dhanasekaran","doi":"10.1039/D4NJ02653E","DOIUrl":"https://doi.org/10.1039/D4NJ02653E","url":null,"abstract":"<p >The development of non-noble metal–organic framework (MOF)-derived bimetallic transition metal nitride (TMN) electrocatalysts for the hydrogen evolution reaction (HER) is a challenging task. Previously, Pt-based electrocatalysts were considered potential noble candidates for the HER owing to their excellent electrocatalytic activity. However, composite electrocatalysts based on the synergy of bimetals and porous carbon have demonstrated the enhanced electrical conductivity and catalytic activity. Herein, a porous Co<small>₃</small>Mo<small>₃</small>N/nitrogen-doped carbon (NC) composite electrocatalyst derived from Mo–Co MOFs was prepared <em>via</em> co-precipitation and pyrolysis at different temperatures (700, 800 and 900 °C), and the samples are denoted as CMN700, CMN800, and CMN900. In this study, the CMN900 catalyst exhibited a porous nanoparticle morphology and improved electron/mass transport, leading to the generation of abundant reactive active sites for the HER. Furthermore, the electrochemical nature of the optimized electrocatalyst was studied using 1 M alkaline potassium hydroxide (KOH) electrolyte solution. The synthesized Co<small>₃</small>Mo<small>₃</small>N/NC electrocatalyst required a low overpotential of 125 mV to attain a low current density of 10 mA cm<small>⁻²</small> and a small Tafel slope of 98.49 mV dec<small>⁻¹</small>. The synergistic performance of the Co and Mo sites in nitrogen-doped carbon achieved good electrochemical active surface area value (92.5 cm<small>²</small>) and charge transfer resistance value (2.20 Ω). Moreover, the durability of the prepared electrocatalyst was verified by chronoamperometry analysis at the low current density for a prolonged duration, demonstrating its good stability and suitability as an electrocatalyst for sustainable hydrogen energy production.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 48","pages":" 20280-20295"},"PeriodicalIF":2.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Functionalization of pyrimidine and purine into RNA bases in water/ammonia ices via radical substitution reactions†","authors":"Anatoliy A. Nikolayev, Mikhail M. Evseev, Vladislav S. Krasnoukhov, Alina A. Kuznetsova, Pavel P. Pivovarov, Denis P. Porfiriev, Alexander M. Mebel and Ralf I. Kaiser","doi":"10.1039/D4NJ03552F","DOIUrl":"https://doi.org/10.1039/D4NJ03552F","url":null,"abstract":"<p >Pyrimidine and purine represent immediate precursors of the four RNA bases, cytosine, uracil, adenine, and guanine. These can be, in principle, synthesized by replacing hydrogen atoms in given positions in pyrimidine and purine with NH<small>₂</small> and/or OH substituents with subsequent H atom migrations from OH to the neighboring “bare” N atom in the ring creating the carbonyl moiety. Electronic structure ωB97XD/6-311G(d,p) and G3(MP2,CC) calculations of the potential energy profiles for these functionalization reactions show that they are plausible and involve moderate barriers for the radical addition and H atom elimination steps. The OH-for-H substitution reaction steps are the most facile and have lower barriers on purine (submerged by ∼4 kJ mol<small>⁻¹</small>) than on pyrimidine (10–19 kJ mol<small>⁻¹</small>). The NH<small>₂</small>-for-H substitution reactions are more energetically demanding, with their barriers ranging between 33 and 54 kJ mol<small>⁻¹</small> and no significant differences have been found between pyrimidine and purine. In the gas phase, the critical reaction step is the H shift from O to the neighboring N in the ring following OH-for-H substitution, with barriers as high as 126–154 kJ mol<small>⁻¹</small>. These barriers can be greatly reduced with the direct involvement of 1–2 protic solvent molecules (<em>e.g.</em>, H<small>₂</small>O, methanol, and NH<small>₃</small>) in ices, to only ∼30–50 kJ mol<small>⁻¹</small>, thus making H migrations comparable in terms of the energy demands with the NH<small>₂</small>-for-H substitution reaction steps. Minimal barriers have been found with the participation of two solvent molecules in the H transfer process. The barriers with the involvement of only one solvent molecule are slightly higher than those with the involvement of two molecules and the increase in the number of solvent molecules directly taking part in the reaction to three and four raises the barriers significantly. For the reactions in water ice, the H transfer transition state structures prominently involve transient hydronium (H<small>₃</small>O<small>⁺</small>) and Zündel (H<small>₅</small>O<small>₂</small><small>⁺</small>) ions in the hydrogen migration process. The presence of implicit solvent taken into account through SCRF calculations does not significantly affect the reaction energetics and barrier heights for radical substitutions but slightly reduces the H shift barriers, where this effect is found to be most pronounced (up to ∼20 kJ mol<small>⁻¹</small>) inside ammonia ice.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 1","pages":" 332-344"},"PeriodicalIF":2.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nano-violet phosphorus/nano-crystalline cellulose composite films for fire-retardant coatings†","authors":"Lihui Zhang, Ting Du, Bingjia Wang, Yiping Tang, Changji Yin, Zixi Chang, Chunbao Du, Yuan Cheng and Gang Zhang","doi":"10.1039/D4NJ04660A","DOIUrl":"https://doi.org/10.1039/D4NJ04660A","url":null,"abstract":"<p >As fire safety issues receive increasing attention, the development of efficient flame-retardant materials has become particularly important. This study explores the preparation methods of nano-violet phosphorus (NVP) and nanocellulose (NCC) composite films and their superior performance in flame retardancy applications. NVP was successfully prepared using a liquid-phase exfoliation method and was then non-covalently self-assembled with NCC to form a novel composite film with good uniformity. The microstructure, mechanical properties, and flame-retardant performance of the composite film were comprehensively characterized. The results indicated that the NVP/NCC composite film with only 1 wt% NVP exhibited significantly enhanced self-extinguishing capability (&lt;2 s) and a peak heat release rate (23.31 kW m<small>⁻²</small>) and total heat release (1.78 MJ m<small>⁻²</small>), indicating its effectiveness in delaying the combustion process under flame exposure. The introduction of NVP made the decomposition rate of the composite film slower and the decomposition behavior more stable in an aerobic environment. In addition, the presence of NVP delayed the dehydration process of NCC, and promoted the carbonization reaction, thereby reducing the release of H<small>₂</small>O, thus forming a protective carbon layer and removing active free radicals, significantly improving the thermal stability and safety of the composite. This work provides important theoretical foundations and practical guidance for the development of new flame-retardant materials.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 1","pages":" 281-290"},"PeriodicalIF":2.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parent 1,4-dihydro-[1,2,3]triazolo[4,5-d][1,2,3]triazole and its derivatives as precursors for the design of promising high energy density materials†","authors":"Agata N. Kuznetsova, Nikita E. Leonov, Oleg V. Anikin, Michael S. Klenov, Aleksandr M. Churakov, Yurii A. Strelenko, Roman A. Novikov, Ivan V. Fedyanin, Alla N. Pivkina, Tatiana S. Kon’kova, Valery P. Sinditskii, Anastasia D. Smirnova and Vladimir A. Tartakovsky","doi":"10.1039/D4NJ04427D","DOIUrl":"https://doi.org/10.1039/D4NJ04427D","url":null,"abstract":"<p >The design of novel high energy density materials (HEDMs) is still one of the significant challenges in the field of applied chemistry. Newly discovered scaffolds are rare, but they open up new possibilities for HEDM design. Herein, a simple and effective two-step approach to previously unknown 1,4-dihydro-[1,2,3]triazolo[4,5-<em>d</em>][1,2,3]triazole (<strong>1</strong>) is presented. This compound is an individual energetic material (<em>d</em> = 1.84 g cm<small>⁻³</small>, <img>, <em>T</em><small>_onset</small> = 193 °C (all experimental values), <em>D</em> = 8.5 km s<small>⁻¹</small>, <em>P</em> = 34 GPa (calculated ones)), but may also serve as a scaffold for the synthesis of structurally diversified related compounds. The precursors of triazolo–triazole <strong>1</strong> are previously unknown 5-amino-4-diazo-4<em>H</em>-1,2,3-triazolium chloride (<strong>4</strong>) and 5-amino-4-diazo-4<em>H</em>-1,2,3-triazole (<strong>5</strong>), which can also serve as starting materials for the synthesis of a variety of novel heterocycles. For example, the diazo compound <strong>5</strong> was used for the regioselective synthesis of a 2,5-disubstituted triazolo–triazole <strong>10</strong> bearing an N<small>₄</small>-tripoid fragment. Overall, the developed approach to triazolo–triazole <strong>1</strong>, 5-amino-4-diazo-4<em>H</em>-1,2,3-triazolium chloride (<strong>4</strong>) and 5-amino-4-diazo-4<em>H</em>-1,2,3-triazole (<strong>5</strong>) is expected to make these high nitrogen systems more accessible and affordable for the design of nitrogen containing fused heterocycles.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 1","pages":" 311-320"},"PeriodicalIF":2.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"One-step preparation of amorphous citrate-chelated CoNiFe trimetallic hydroxides for the oxygen evolution reaction†","authors":"Jiaqi Zhou, Yuhong Zhang, Tianrui Yu, Mingxin Feng, Tong Wang, Chuangyi Tong, Zewu Zhang, Jiehua Bao and Yuming Zhou","doi":"10.1039/D4NJ04240A","DOIUrl":"https://doi.org/10.1039/D4NJ04240A","url":null,"abstract":"<p >Reasonable morphology regulation and electronic structure modulation enhance the oxygen evolution reaction (OER) performance of the catalyst. In this study, amorphous citrate-chelated CoNiFe trimetallic hydroxide nanoparticles were synthesized in one step <em>via</em> coprecipitation at room temperature. The choice of solvents controlled the hydrolysis rate of metal cations, allowing for the regulation of the product morphology. An alcohol–water system as the solvent facilitated the formation of more uniform and well-dispersed nanoparticles. Citrate was employed as a chelating agent, and its strong interaction with metal cations improved the stability of the amorphous materials, regulated the particle size, and increased the electrochemically active surface area. Furthermore, varying amounts of Ni ions were doped to modulate the electronic structure, exerting tri-metallic synergistic effects, which enhanced the OER performance. The results demonstrated that, in 1.0 M KOH, the optimized Co : Ni : Fe molar ratio of 2 : 1 : 1 achieved the highest OER activity, with an overpotential of 287 mV and a Tafel slope of 56.3 mV dec<small>⁻¹</small>, delivering a current density of 10 mA cm<small>⁻²</small>, and maintaining stable performance over 24 hours with only a minor increase in the overpotential.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 1","pages":" 183-191"},"PeriodicalIF":2.7,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selective separation and complexation of trivalent actinides and lanthanides using an unsymmetric pyridine-derived triazinyl and amide extractant†","authors":"Chenchen Zhu, Yuxiao Guo, Xiao Yang, Xiaofan Yang, Shihui Wang, Chao Xu, Chengliang Xiao and Lei Xu","doi":"10.1039/D4NJ04483E","DOIUrl":"https://doi.org/10.1039/D4NJ04483E","url":null,"abstract":"<p >Unsymmetric N-heterocyclic extractants have been proven to have good application prospects in the separation of trivalent actinides over lanthanides from highly active liquid waste. In this article, a novel unsymmetric pyridine-based extractant functionalized with triazinyl and amide groups (<em>N</em>-ethyl-<em>N</em>-(<em>p</em>-tolyl)-6-(5,9,9-trimethyl-5,6,7,8-tetrahydro-5,8-methanobenzo[<em>e</em>][1,2,4]triazin-3-yl)picolinamide (Et-Tol-CA-ATP)) was designed and used for the extraction and complexation towards trivalent lanthanide and actinide ions. The ligand Et-Tol-CA-ATP exhibited moderate extraction ability but high selectivity towards Am(<small>III</small>) over Eu(<small>III</small>) (SF<small>_{Am(<small>III</small>)/Eu(<small>III</small>)}</small> = 16.9) under highly acidic HNO<small>₃</small> conditions. The complexation mechanism and extraction behaviors of Et-Tol-CA-ATP for Am(<small>III</small>) and typical lanthanides were thoroughly investigated by NMR spectroscopy, UV-vis spectrophotometry, time-resolved laser fluorescence spectroscopy (TRLFS), high-resolution electrospray ionization mass spectrometry (HR-ESI-MS) analysis and DFT calculations. The stability constants for the formation of 1 : 1 and 1 : 2 Nd(<small>III</small>) complexes with Et-Tol-CA-ATP in CH<small>₃</small>CN were determined as 2.26 ± 0.02 and 4.38 ± 0.01, respectively. The geometric structures of the 1 : 1 and 1 : 2 complexes of Am(<small>III</small>) and Eu(<small>III</small>) coordinated with Et-Tol-CA-ATP and their differences in the bonding nature leading to the extraction selectivity were further illustrated using DFT calculations. This work describes the successful synthesis of a new unsymmetric pyridine-based triazinyl and amide extractant to selectively separate Am(<small>III</small>) over Eu(<small>III</small>) from highly acidic HNO<small>₃</small> solutions, providing an alternative strategy for developing some new unsymmetric extractants for the separation of trivalent minor actinides.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 1","pages":" 192-203"},"PeriodicalIF":2.7,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Co-production of polyhydroxyalkanoates (PHAs) and exopolysaccharides (EPSs) by halophilic archaeon Haloferax mucosum†","authors":"Mayra Alejandra López-Ortega, Marianela Escalante-Avilés, Adriana Inés Rodríguez-Hernández, Ma. del Rocio López-Cuellar, Rocio Yaneli Aguirre-Loredo, Víctor Manuel Martínez-Juárez, Fermín Pérez-Guevara, Miguel Ángel Hernández-Valdepeña and Norberto Chavarría-Hernández","doi":"10.1039/D4NJ02422B","DOIUrl":"https://doi.org/10.1039/D4NJ02422B","url":null,"abstract":"<p >This is the first report on the co-production of polyhydroxyalkanoates (PHAs) and exopolysaccharides (EPSs) by the halophilic archaeon <em>Haloferax mucosum</em> (DSM 27191) in a modified ATCC 2185 medium (NaCl 2.5 M, yeast extract 6 g L<small>⁻¹</small>) with nitrogen limitation (C/N = 35 molar ratio), where it can produce 6.7 g<small>_EPS</small> L<small>⁻¹</small> and 0.25 g<small>_PHA</small> L<small>⁻¹</small>. The PHA production is favoured when NaCl increases to 4 M and at higher nitrogen limitation (C/N = 50) reaches 0.75 g<small>_PHA</small> L<small>⁻¹</small>, but the EPSs were not detectable in the supernatant. The recovered PHAs are a copolymer of P(3HB-<em>co</em>-3HV), and the production conditions impact their chemical features (<em>i.e.</em> 3HV content, melting temperature, degree of crystallinity and molar mass). EPSs are anionic sulfated heteropolysaccharides composed of uronic acids, glucose, galactose, mannose and fructose. Purified EPSs have a high molar mass of 901 kDa and exhibit shear-thinning rheological behaviour in aqueous solution.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 48","pages":" 20188-20200"},"PeriodicalIF":2.7,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}