SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Wanyu He,Jiaqi Ding,Wanni Liu,Wenjue Zhong,Lingyan Zhu,Lin Zhu,Jianfeng Feng
Due to the widespread use of organophosphate esters (OPEs), the occurrence and trophic transfer of OPEs have attracted attentions in ecosystems. However, as the final sink for these chemicals, the bioaccumulations and trophodynamics of OPEs in marine ecosystems are still not clear. In this study, seawater, sediment and marine organisms collected from Bohai Bay (BHB), Laizhou Bay (LZB), and Liaodong Bay (LDB) in Bohai Sea (BS), China were analyzed to investigate the occurrence, bioaccumulation and trophic transfer of typical OPEs. Total concentration of OPEs (∑ 9 OPEs) in surface water in LZB (255.8 ± 36.44 ng/L) and BHB (209.6 ± 35.61 ng/L) was higher than that in LDB (170.0 ± 63.73 ng/L). Marine organisms in LZB accumulated the highest concentrations of OPEs among the 3 bays (∑ 10 OPEs, 70.56 ± 61.36 ng/g ww). Average bioaccumulation factor (BAF) of OPEs in marine organism in BHB, LZB, and LDB was ranged from −2.48 to 0.16, from −2.96 to 1.78, and from −2.59 to 0.59. We also found that trophic magnification factors (TMF) are generally <1, which suggested trophic dilutions of OPEs in BS, China. Nevertheless, the relatively high OPEs levels in BS still may bring potential risks to ecosystem and human health.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Ailin Zhang,Yanhua Hou,Quanfu Wang,Yatong Wang
Biotreatment of polyethylene (PE) waste is an emerging topic in environmental remediation; in particular, the degrading enzymes requires further exploration. This study described a novel cold-adapted laccase (PsLAC) from an Antarctic psychrophile and characterized its PE-degradation ability. Homology modeling revealed that PsLAC possessed a typical bacterial laccase catalytic structure and unique cold adaptation structural characteristics such as few hydrogen bonds . Recombinant PsLAC (rPsLAC) retained 54.3% residual activity at 0 ℃ and presented increased K m values at low temperatures and a relatively high k cat value (42.65 s −1 ). Collectively, these factors help resist cold stress. rPsLAC possessed substantial salt tolerance at 1.5 M NaCl, with 119.80% activity, and Cu 2+ enhanced its activity to 127.10%. PE-degradation experiments indicated that 13.2% weight was lost, and the water contact angle was decreased to 74.6°. Polar functional groups such as carbonyl and carboxyl groups on PE surface were detected in Fourier transform infrared spectroscopy ; X-ray diffraction exhibited that crystallinity reduced by 25%. Enormous damage to PE surface and interior was observed via scanning electron microscopy. Overall, PsLAC, with its unique cold-adapted catalytic structure and biochemical characteristics, could supplement the diversity of sources and properties of bacterial laccases and ensure PE-degradation with a novel cold-adapted enzyme resource.
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Marine Drugs
·
2022
·Vol. 20
·期 5
·322
·
IF 6.085
Han-Zhuang Weng,Jun-Yu Zhu,Fang-Yu Yuan,Zhuo-Ya Tang,Xiao-Qing Tian,Ye Chen,Cheng-Qi Fan,Gui-Hua Tang,Sheng Yin
Chromatographic fractionation of the EtOH extracts of the marine-derived fungusAspergillusversicolorA18 has led to the isolation of 11 homo/hetero-dimers of aromatic bisabolane sesquiterpenoids including eight diphenyl ether-coupled aromatic bisabolanes (1a/1band5–10) and three homodimers (2–4), together with their monomers including three aromatic bisabolanes (11–13) and two diphenyl ethers (14and15). Their structures and absolute configurations were elucidated by extensive spectroscopic analysis including HRESIMS, 1D/2D NMR, calculated ECD, and the optical rotatory data. Among the four new compounds, (+/−)-asperbisabol A (1a/1b), asperbisabol B (2), and asperbisabol C (3), the enantiomers1aand1brepresent an unprecedented skeleton of diphenyl ether-coupled aromatic bisabolane sesquiterpenoids with a spiroketal core moiety. The neuroprotective effects of selected compounds against sodium nitroprusside (SNP)-induced injury were evaluated in PC12 cells by the MTT assay. Five compounds (1a,6, and8–10) showed remarkable neuroprotective activities at 10 μM, being more active than the positive control edaravone.Keywords:diphenyl ether-coupled aromatic bisabolane;aromatic bisabolane dimer;marine-derived fungus;Aspergillus versicolor;neuroprotective activity
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 9
·4488
·
IF 6.208
Li Gao,Chen Xu,Xuelin Tao,Zhichuang Zuo,Zimo Ning,Linghui Wang,Na Gao,Jinhua Zhao
Fucan sulfate I (FSI) from the sea cucumberHolothuria fuscopunctatawas purified and its structure was clarified based on a bottom-up strategy. The unambiguous structures of a series of oligosaccharides including disaccharides, trisaccharides, and tetrasaccharides, which were released from mild acid hydrolysis of FSI, were identified by one-dimensional (1D)/two-dimensional (2D) nuclear magnetic resonance (NMR) and mass spectrometry (MS) analysis. All the glycosidic bonds in these oligosaccharides were presented as α1,3 linkages confirmed by correlated signals from their1H-1H ROESY and1H-13C HMBC spectra. The structural sequence of these oligosaccharides formed by Fuc2S4S, Fuc2S, and non-sulfated ones (Fuc0S), along with the general structural information of FSI, indicated that the structure of FSI could be elucidated as: [-L-Fuc2S4S-α1,3-L-Fuc(2S)-α1,3-L-Fuc2S-α1,3-L-Fuc0S-α1,3-1-]n. Moreover, the L-Fuc0S-α1,3-L-Fuc2S4Slinkage in FSI was susceptible to be cleaved by mild acid hydrolysis. The antioxidant activity assays in vitro showed that FSI and the depolymerized product (dFSI′) had potent activities for superoxide radical scavenging activity with IC50of 65.71 and 83.72 μg/mL, respectively, while there was no scavenging effect on DPPH, hydroxyl and ABTS radicals.Keywords:fucan sulfate;mild acid hydrolysis;oligosaccharides;structure;antioxidant activity
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ACS ES&T Water
·
2022
·
IF 0
Yang Liu,Jinao You,Yi Tang,Yong He,Florian Breider,Shu Tao,Wenxin Liu
As an important connection of terrestrial and marine ecosystems, rivers input multitudinous (micro)plastics into the oceans. However, comparisons of field and estimated riverine inputs of (micro)plastics and contributions of multiple parameters are limited. Herein, the mainstream Haihe River (MHR), a typical seagoing river under great pressure of high urbanization and industrialization, is studied as an example. Field samplings were conducted using a 100 μm Manta trawl, and a generalized additive model (GAM) was developed to interpret the differences between the local and estimated riverine inputs. Lower abundance (9.9 ± 7.2 items·m–3) with higher diversity, while higher abundance (11.3 ± 7.5 items·m–3) with lower diversity of microplastics was found during the wet and dry seasons. Polyethylene, polypropylene, and poly(ethylene terephthalate) may originate from nonseasonal sources, while polyamide and polyurethane may come from seasonal sources. The annual (2018–2019) riverine inputs of microplastics and plastics from the MHR into the Bohai Sea were 3.93–5.78 tons (3.91–5.76 billion items) and 30.81–38.67 tons (4.01–5.87 billion items), which were substantially lower than estimations from previous models. GAM gave the main parameters contributing to the variations in microplastics, including hydrochemical conditions (34.4%), dam interception (14.6%), sewage effluents (8.0%), and population density (1.1%). In addition to anthropogenic activities, the effects of hydrochemical conditions on microplastics should also be considered.
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CHROMATOGRAPHIA
·
2022
·Vol. 85
·期 4
·365-371
·
IF 2.213
Mei Ling,Tang Hao,Wang Shuai,Guo Yong,Liang Xiaojing
Sub-2-µm sea-urchin-like TiO 2 microspheres were prepared through the one-step solvothermal method. Results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that there are a lot of nanorods coming out from the center of the TiO 2 microsphere, making it look like a sea urchin. The morphology and structure of these microspheres are very suitable for chromatographic packing. During the separation of inorganic anions on this new stationary phase, the retention mechanism is electrostatic interaction, and the pH of the mobile phase plays an important role in retention behaviors. With this new stationary phase for separation of organic anions and nucleobases, Lewis acid–base interaction is more outstanding, which can cause peak broadening and tail for larger conjugated structure compounds. The separation of aromatic hydrocarbons on this new stationary phase demonstrates that Lewis acid–base interaction has a favorable influence on the separation of electron-rich aromatic hydrocarbons under normal phase chromatographic conditions. Graphical abstract
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APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Yichen Zhang,Shugui Hua,Xiaoqin Sun,Zhuoyue Liu,Yuan Dang,Liang Zhang,Yuanzhen Zhou
A sea urchin-like NiO/Co 3 O 4 composite cathode was synthesized by two-step hydrothermal in-situ growth method and a Fenton-like process inducing two-electron oxygen reduction reaction (ORR) was established to degrade levofloxacin (LEV) in this paper. NiO/Co 3 O 4 exhibited higher specific surface area and better electrical conductivity comparing with NiO or Co 3 O 4 , indicating an excellent synergistic effect between NiO and Co 3 O 4 . Moreover, NiO/Co 3 O 4 cathode could effectively degrade LEV wastewater, the removal efficiency could reach 77.8% after 120 min and the corresponding COD removal efficiency was 41.0%. Further studies showed that the effective conversion of Co(Ⅱ)/Co(Ⅲ) and Ni(Ⅱ)/Ni(Ⅲ) occurred on the electrode surface, which promoted the generation of •OH. Finally, a possible degradation pathway of LEV involved defluorination, deamination, demethylation and other processes was proposed. In short, the research could provide important reference for solving electrochemical problems related to electrocatalytic ORR and Fenton-like degradation of antibiotic wastewater.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 17
·175501
·
IF 3.874
Jiamin Gao,Lu Huang,Zhuomin Zhang,Gongke Li
It is of great significance to construct specially designed gold nanocrystals (AuNCs) with precisely controllable size and morphology to achieve an excellent physicochemical performance. In this work, sea urchin-shaped AuNCs with tunable plasmonic property were successfully synthesized by the hybridized double-strand poly adenine (dsPolyA) DNA-directed self-assembly technique. Hybridized dsPolyA as the directing template had suitable rigidity and upright conformation, which benefited the controllable formation of these anisotropic multi-branched AuNCs with the assistance of surfactant. The effects of essential conditions influencing the synthesis and precise morphology control were investigated in detail. COMSOL simulation was used to evaluate their electromagnetic field distribution according to their morphologies, and the result suggested that sea urchin-shaped AuNCs had abundant 'hot spots' for surface-enhanced Raman scattering (SERS) detection due to their regular nanoprotuberance structure. Finally, sea urchin-shaped AuNCs with excellent SERS and catalytic performance were applied for the quantitative analysis of food colorant and catalytic degradation of potential pollutants. The SERS enhancement factor of sea urchin-shaped AuNCs was up to 5.27 × 106, and the catalytic degradation rate for 4-NP by these AuNCs was up to −0.13min−1.
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RSC Advances
·
2021
·Vol. 11
·期 32
·19813-19818
·
IF 3.361
Yazhou Qin,Yuanzhao Wu,Binjie Wang,Jiye Wang,Xingsen Zong,Weixuan Yao
Branched Au nanoparticles (Au NPs) can significantly enhance the Raman signal of trace chemical substances, and have attracted the interest of researchers. However, there are still challenges to accurately prepare the morphology of branched Au NPs. In this work, we have successfully prepared sea urchin-like Au NPs and Au nanowires by using the seed-mediate growth method, with cetyltrimethylammonium bromide (CTAB) and glutathione as ligands, and ascorbic acid as a reducing agent. Using Au NPs with a tetrahexahedron (THH) morphology as seeds, and by simply changing the concentration of glutathione, we explored the growth process of sea urchin-like Au and Au nanowires. At low concentrations of glutathione, Au NPs will preferentially grow along the edges and corners of the THH Au seed, forming a core/satellite structure. As the concentration of glutathione increases, Au NPs will grow along the direction of glutathione, forming sea urchin-like Au NPs. To further increase the concentration of glutathione, we will prepare Au nanowires. In addition, we use the prepared Au NPs as a substrate material for surface-enhanced Raman (SERS) high-sensitivity detection. By using 4-aminothiophenol (4-ATP) as the test molecule, we evaluated the SERS effect of the prepared Au NPs with different morphologies. The results showed that sea urchin-like Au NPs have the best enhancement effect. The lowest concentrations of Rhodamine 6G and 4-ATP were 10−10 M and 10−12 M, respectively, using sea urchin Au NPs as the base material. Furthermore, we conducted a highly sensitive SERS detection of the poison atropine monohydrate, and the lowest detected concentration was 10−10 M.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Wei Guo,Jun Li,Qingwei Liu,Jianghong Shi,Yue Gao
Artificial sweeteners (ASs), as a new emerging pollutant, the fate from wastewater treatment plants (WWTPs) to sea is growing concerned. In this study, the distribution and polluted loading of six typical ASs were analyzed based on the measurement in influent, primary effluent, secondary effluent, tertiary effluent, suspended particulate matter (SPM), and sludge from four WWTPs and receiving waters near the coast of Shenzhen city, China. Elevated levels of ASs were detected in WWTPs located near a highly populated area (about 14,000 people km -2 ). Sucralose was predominant in all water samples (0.1–22.2 μg L -1 ), and had a 1.6–704.0 times higher concentration than the means of other ASs detected. Aspartame were mainly distributed in SPM and sludge, and the fractions in offshore water exceeded 45%. Acesulfame, sucralose, cyclamate and saccharin could be effectively removed by secondary biochemical treatment. The average daily loading (4.2 g d -1 1000people -1 ) and discharge loading (0.4 g d -1 1000people -1 ) of sucralose in WWTPs was higher than those of the other ASs. Dissolved organic carbon and UV 254 can affect the fate of ASs, and SPM mainly affects the distributions of aspartame and neotame. As a potential sewage indicator, neotame deserves further attention.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 22
·9304-9312
·
IF 3.288
Simin Wei,Yinghui Wang,Zhishu Tang,Jinhang Hu,Rui Su,Jingjie Lin,Tuan Zhou,Hui Guo,Nan Wang,Rongrong Xu
Green synthesis of silver nanoparticles (AgNPs) has been extensively studied by using a variety of plant extracts for applications in biomedical sciences and engineering. However, there are no reports on the synthesis of AgNPs by utilizing the berry extract of Sea Buckthorn, which is a traditional Chinese medicine and exhibits a wide spectrum of antioxidant, anti-inflammatory and anticancer activities. In this paper, we report an easy and eco-friendly technique for the preparation of AgNPs using the Sea Buckthorn berry extract under ultrasonic radiation at ambient temperature and the evaluation of both biosynthesis parameters and biological activities. The UV-visible spectrum and dynamic light scattering (DLS) analysis showed that the size of AgNPs was sensitive to the biosynthesis parameters, such as the pH of the extract, material proportion and reaction time, offering a size-controlled synthetic method for AgNPs. The X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and DLS studies showed that the AgNPs (pH 10.0; material proportion 1 : 1; 4 h) had a face-centered cubic (fcc) structure and spherical shape with an average particle size of 27.3 ± 0.2 nm covered by anions, and existed in a monodispersed form with a polydispersity index (PDI) of 0.213. The biosynthesized AgNPs showed potent anticancer activity against human colorectal cancer (HCT116 and SW620), hepatoma cancer (HepG2), breast cancer (MCF-7) and cervical cancer (HeLa) cell lines as well as strong antioxidant activity. The IC50 values for these five cell lines were 8.77, 4.61, 14.59, 16.05 and 27.98 μg mL−1, respectively. However, the biosynthesized AgNPs revealed poor inhibition activities for the growth of E. coli and S. aureus. These results confirmed that the Sea Buckthorn could be a low-cost, nontoxic and eco-friendly natural resource for the synthesis of AgNPs, which might be useful for the development of new alternative antioxidant and anticancer agents in biomedicine.
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CHEMICAL PAPERS
·
2019
·Vol. 73
·期 8
·1971-1978
·
IF 1.246
Liu Xiue,Sun Chen,Yue Yundi,Yan Tingjiang,He Yuanchun,Yu Yang,Li Wenjuan,Wang Wenliang,Zhu Kunlei,Jing Zhihong
Three-dimensional (3D) AgBr/TiO 2 microspheres with remarkable sea urchin-like architectures were prepared by a solvothermal-hydrothermal two-step process. The products have been characterized through XRD, SEM, HRTEM and Nitrogen adsorption–desorption analysis. The antibacterial activity of the 3D AgBr/TiO 2 microspheres against Escherichia coli ( E. coli ) was investigated quantitatively by microcalorimetric method for the first time. Meanwhile, the visible-light photocatalytic performance of the 3D AgBr/TiO 2 microspheres was also evaluated for the degradation of rhodamine B (RhB). As a contrast, the same tests were carried out for the conventional AgBr/P25 (TiO 2 ). The results show that the 3D AgBr/TiO 2 microspheres prevent better antibacterial and visible-light photoctalytic performance than the conventional AgBr/P25. It revealed that unique morphology effect, the extraordinary visible-light responses of AgBr and various oxidative radicals produced by visible light irradiated 3D AgBr/TiO 2 microspheres are responsible for improved antibacterial and photocatalytic performance.
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危险品化学品经营许可证（带存储）