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Radical dehydroxymethylative fluorination of aliphatic primary alcohols and diverse functionalization ofα-fluoroimides via BF_(3)·OEt_(2)-catalyzed C-F bond activation

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Chinese Chemical Letters 2025年第1期36卷 239-243页

作者： Peng Wang Jianjun Wang Ni Song Xin Zhou Ming Li Molecular Synthesis Center Key Laboratory of Marine MedicineChinese Ministry of EducationSchool of Medicine and PharmacyOcean University of ChinaQingdao 266003China Laboratory for marine Drugs and bioproducts Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China

Ag_(2)CO_(3)-promoted dehydroxymethylative fluorination of aliphatic alcohols has been achieved with Selectfluor as both oxidant and fluorine *** reaction involvesβ-fragmentation of primary alkoxy radicals,followed by the fluorination of the resulting C-centered radical *** transformation proceeds under mild reaction conditions and exhibits a broad substrate scope,thus opening up a new entrance to the synthesis of fluorinated constructs includingα-fluoroimides and 1-fluoroalkyl benzoates as well as secondary and tertiary alkyl fluorides like versatile 2-fluoro-2-alkyl 1,3-propandiol *** divergent functionalization of the obtainedα-fluoroimides enables an efficient access to amine derivatives through C-F bond activation under the action of BF_(3)·OEt_(2).

关键词： Dehydroxymethylative fluorination Alkoxy radicals β-Fragmentation Silver catalysis C-F Bond activation

Adsorption Characteristics of Congo Red Dye onto Calcinated Mytilus edulis Shell Powders

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Journal of Ocean University of China 2025年第1期24卷 229-237页

作者： WANG Xin GE Xiangyun ZHU Siqi LIU Weixiang XING Ronge LI Pengcheng LI Kecheng marine Science and Engineering College Qingdao Agricultural UniversityQingdao 266109China Key Laboratory of Experimental marine Biology Center for Ocean Mega-ScienceInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for marine Drugs and bioproducts Qingdao Marine Science and Technology CenterQingdao 266237China

Dye wastewater poses a significant threat to aquatic organisms due to its high *** or eliminating the dye waste from the water is necessary for a healthy and sustainable *** study investigated the adsorption properties of Congo red dye on Mytilus edulis shell powders prepared by calcination at 500℃,700℃,and 900℃.The modified shell powder products were analyzed by SEM(scanning eletron microscopy)and FTIR(fourier transform infrared spectroscopy)for the morphology and structural *** effects of different calcination temperatures,reaction times,reaction temperatures,and initial concentration of Congo red on the adsorption properties were *** adsorption kinetics and isothermal adsorption models were also *** results revealed that the shell powder calcinated at 900℃showed the best adsorption capacity on Congo red from aqueous *** adsorption reaction reached equilibrium after 150 min and followed by the pseudo-second-order kinetic *** 25℃,96.2%of the Congo red in the solution could be removed,and the adsorption capacity could reach at least 1015 mg g^(–1).The adsorption isotherm is fit with the Freundlich model,indicating a multiphase adsorption *** results are helpful for cleaning and treating printing and dyeing effluents as well as high-value utilization of shell waste resources.

关键词： adsorption Congo red high-temperature calcination Mytilus edulis shell

Efficient conversion of chitin to HMF under the cocatalytic system of formic acid and silicotungstic acid

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Journal of Oceanology and Limnology 2025年第1期43卷 261-273页

作者： Luxiao ZHOU Kun GAO Peng HE Huahua YU Ronge XING Song LIU Yukun QIN College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China CAS and Shandong Province Key Laboratory of Experimental marine Biology Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for marine Drugs and bioproducts Qingdao Marine Science and Technology CenterQingdao 266237China

The conversion process of chitin,one of the abundant biomass resources on the earth,not only follows the principles of green chemistry,but also has significant value in industrial ***,it is a great challenge to directly convert insoluble and rigid structured chitin to 5-hydroxymethylfurfural(HMF).To address this issue,we developed a green conversion process combining pretreatment and catalytic *** was first pretreated by hexafluoro isopropanol(HFIP),which somewhat disrupted the hydrogen bonding network within the chitin ***,formic acid(FA)and silicotungstic acid(STA)synergistically catalyzed the conversion to HMF in a biphasic system of 2-methyltetrahydrofuran(2-Me-THF)/H2O,and high yields(40.2%)HMF was obtained under the optimism *** product distribution was analyzed by HPLC-MS and the co-catalysis of FA with STA was evidenced.A dual-function catalytic system with both Lewis and Br?nsted acids was created,the catalytic system that significantly improved the efficiency of complex tandem catalytic reactions with *** on the experimental results,a possible pathway for chitin conversion was deduced,providing a new catalytic idea for the efficient conversion of chitin to HMF.

关键词： chitin 5-hydroxymethylfurfural 2-Me-THF/H2O biphasic system Lewis and Br?nsted acid

The effect of typical seawater cations on the adhesion of mussel protein Mefp-1 based on dissipative quartz crystal microbalance

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Journal of Oceanology and Limnology 2025年第1期43卷 274-285页

作者： Futao ZHANG Chengjun SUN Linqing XIE Fuqian LI Fenghua JIANG Jingxi LI marine Bioresource and Environment Research Center First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory of marine Drugs and bioproducts Laoshan LaboratoryQingdao 266237China Shandong Jinpiao Food Machinery Co. Ltd.Weihai 264300China

Mussels are common anchoring organisms that adhere to the surfaces of various substrates with their *** adhesion of mussel to substrates is contingent upon the presence of mussel foot proteins,of which Mytilus edulis foot protein-1(Mefp-1)has been identified as the most abundant *** has been found that lipids are involved in the mussel adhesion process and can facilitate *** this research,the adhesion behavior of Mefp-1 on various substrate surfaces under the effect of typical seawater cations with or without the presence of lipid were investigated using a quartz crystal microbalance with dissipation(QCM-D).Results indicate that the presence of cations Ca^(2+),Mg^(2+),Na^(+),and K^(+)leads to varying degrees of reduction in the adhesion performance of Mefp-1 on different *** degree of this reduction,however,was much alleviated in the presence of palmitic acid,which is involved in the mussel adhesion ***,the involvement of palmitic acid is advantageous for mussel protein adhesion to the substrate surface in the marine *** study illustrated the significant contribution of palmitic acid to mussel adhesion,which can help to better understand biofouling mechanisms and develop biomimetic adhesive materials.

关键词： mussel adhesion quartz crystal microbalance with dissipation(QCM-D) typical seawater cations palmitic acid Mefp-1

Exploring economic viable species via assessing a tropic-specific microalgal collection

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Journal of Oceanology and Limnology 2025年第1期43卷 210-218页

作者： Chen MA Ni WANG Yi XIN Qinhua GAN Wenxu ZHOU Yandu LU State Key Laboratory of marine Resource Utilization in South China Sea School of Marine Biology and FisheriesHainan UniversityHaikou 570228China Hainan Engineering&Research Center of marine Bioactives and bioproducts Haikou 570228China Haikou Innovation Platform for Research&Utilization of Algal Bioresource Hainan UniversityHaikou 570228China Hainan Provincial Key Laboratory of Tropical Hydrobiotechnology Hainan UniversityHaikou 570228China

Locations around the equator provide unique habitats for microalgae presumably with exceptional *** develop microalga-derived product systems,we previously created a(sub)tropical microalgal *** this study,two Chlorella strains(MEM176 and MEM193),adaptive to typical tropical climate,were isolated from the *** production performance was evaluated where both strains showed a robust growth in high temperatures and light ***,the strains MEM176 and MEM193 produced 503.6-mg/(L·d)and 411.3-mg/(L·d)biomass,respectively,with high contents of *** commercial and nutritional values were emphasized by amino acid compositions(e.g.,proline,valine,and phenylalanine).Particularly,higher amounts of proline were revealed in MEM176(47.9 mg/g dry biomass(DW))and MEM193(47.9 and 59.2 mg/g DW)than available commercial *** with MEM193,MEM176 produced 129.7%more lipids in which unsaturated fatty acids(particularly linoleic acid andα-linolenic acid)account for 65%of the total ***,it is promising to explore the potential of these Chlorella strains as food additives via outdoor cultivation in tropical area,notably MEM176 that exhibits superiority as sources of essential amino acids and valuable fatty acids.

关键词： Chlorella tropical species food additive microalga

Ferulic acid alleviates long-term avermectin-induced damage to the spleen of carp and restores its inflammatory response and oxidative balance

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Journal of Environmental Sciences 2025年第5期151卷 616-626页

作者： Hanyu Wang Shenye Feng Enzhuang Pan Xiaomeng Ji Mengyuan Zhou Shuai Zhang Baoshi Xu Huimiao Feng Jilei Yin Zibo Dong Jiangsu Key Laboratory of marine Bioresources and Environment Co-Innovation Center of Jiangsu Marine Bio-industry TechnologyJiangsu Marine Pharmaceutical Resources Development Engineering Research CenterJiangsu Key Laboratory of Marine Pharmaceutical Compound ScreeningCollege of PharmacyJiangsu Ocean UniversityLianyungang 222005China Department of Traditional Chinese Medicine Jiangsu Union Technical Institute Lianyungang Branch institute of Traditional Chinese MedicineLianyungang 222006China

Extensive use of avermectin(AVM)in agriculture can seriously contaminate fish in *** acid(FA)is a strong antioxidant sourced from plants and is widely applied in food and medicine,but its protective function on the immunological damage caused by AVM is still *** this study,carp were chronically exposed to(1/1096 hr LC_(50))AVM for 30 day(s),with a dietary supplement of FA(400 mg/kg)to assess its effects on carp *** experimental groups(n=10)included:control,AVM-exposed(2.404μg/L),FA+AVM co-treated,and FA ***-term AVM exposure altered spleen tissue,reducing serum complement C3(pdevelopment of fish feed for aquaculture.

关键词： Avermectin Ferulic acid Oxidative stress Inflammation response

Expression and characterization of a novel GH128 laminarinase OUC-Bs Lam26 harboring both hydrolyzing and transferring activities

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Food Science and Human Wellness 2025年第1期14卷 134-143页

作者： Yueyang Dong Yongyi Quan Hong Jiang Hamed I.Hamouda Zewei Lu Yimiao Chen Chengqiang Li Xiangzhao Mao State Key Laboratory of marine Food Processing and Safety Control College of Food Science and EngineeringOcean University of ChinaQingdao 266404China Qingdao Key Laboratory of Food Biotechnology Qingdao 266404China Key Laboratory of Biological Processing of Aquatic Products China National Light IndustryQingdao 266404China Sanya Ocean Research Institute Ocean University of ChinaSanya 572025China Processes Design and development Department Egyptian Petroleum Research InstituteCairo 11727Egypt Laboratory for marine Drugs and bioproducts of Qingdao National Laboratory for marine Science and Technology Qingdao 266237China

Laminarin oligosaccharides(LOSs)with a specific degree of polymerization prepared through the laminarin degradation via laminarinase present more significant nutritional functions and application *** intestinal bacteria are promising potential producers of novel carbohydrate-active enzymes with unique ***,a novel glycoside hydrolase family 128(GH128)laminarinase OUC-BsLam26 from the intestinal bacterium Bacteroides ***7301 was heterologously expressed and *** recombinant OUC-BsLam26 with a molecular mass of 49.86 kDa exhibits highest activity(6.60 U/mg)at 45℃ and pH 6.0,which shows noticeable temperature and pH *** purified OUC-BsLam26 could degrade laminarin via an endo-type mode with the generation of laminaripentaose,laminaritetraose,laminaritriose,and laminaribiose,among them,laminaritetraose is the principal product,which accounts for 45.25% of the total products,which is significantly different from the reported GH128 *** minimum recognition substrate of OUC-BsLam26 is ***,OUC-BsLam26 also could catalyze the transglycosylation process with the production of some novel ***,the intestinal bacterium Bacteroides ***7301 contains laminarinase with unique product composition and OUC-BsLam26 is a hopeful bio-catalyst with the potential to produce laminaritetraose and some novel glycosides.

关键词： Laminarinase Expression Laminarin oligosaccharides Hydrolytic pattern Novel glycosides

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Genes and proteins expressed at different life cycle stages in the model protist Euplotes vannus revealed by both transcriptomic and proteomic approaches

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Science China(Life Sciences) 2025年第1期68卷 232-248页

作者： Yaohan Jiang Xiao Chen Chundi Wang Liping Lyu Saleh A.Al-Farraj Naomi A.Stover Feng Gao Key Laboratory of Evolution&marine Biodiversity(Ministry of Education)and Institute of Evolution&marine Biodiversity Ocean University of ChinaQingdao 266003China marine College Shandong UniversityWeihai 264209China Zoology Department College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Biology Bradley UniversityPeoria 61625USA Laboratory for marine Biology and Biotechnology Qingdao Marine Science and Technology CenterQingdao 266237China

Sexual reproduction first appeared in unicellular protists and has continued to be an essential biological process in almost all *** protists, which contain both germline and somatic genomes within a single cell, have evolved a special form of sexual reproduction called conjugation that involves mitosis, meiosis, fertilization, nuclear differentiation, genome rearrangement, and the development of unique cellular structures. The molecular basis and mechanisms of conjugation vary dramatically among ciliates, and many details of the process and its regulation are still largely unknown. In order to better comprehend these processes and mechanisms from an evolutionary perspective, this study provides the first comprehensive overview of the transcriptome and proteome profiles during the entire life cycle of the newly-established marine model ciliate Euplotes vannus. Transcriptome analyses from 14 life cycle stages(three vegetative stages and 11 sexual stages) revealed over 26,000 genes that are specifically expressed at different stages, many of which are related to DNA replication,transcription, translation, mitosis, meiosis, nuclear differentiation, and/or genome rearrangement. Quantitative proteomic analyses identified 338 proteins with homologs associated with conjugation and/or somatic nuclear development in other ciliates, including dicer-like proteins, Hsp90 proteins, RNA polymerase Ⅱ and transcription elongation factors, ribosomal-associated proteins, and ubiquitin-related proteins. Four of these homologs belong to the PIWI family, each with different expression patterns identified and confirmed by RT-qPCR,which may function in small RNA-mediated genome rearrangement. Proteins involved in the nonhomologous end-joining pathway are induced early during meiosis and accumulate in the developing new somatic nucleus, where more than 80% of the germline sequences are eliminated from the somatic genome. A number of new candidate genes and proteins likely t

关键词： sexual reproduction transcriptomic proteomic genome rearrangement PIWI NHEJ

Analysis of the redox environment and genesis of surface sediment in the northeast Indian Ocean at the Ninety-East Ridge

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Journal of Oceanology and Limnology 2025年第1期43卷 57-72页

作者： Zhourong CAI Qianru HUANG Zhengxin YIN Xin SUI Sibo LÜ Meng TANG Juan PENG School of marine Sciences Sun Yat-sen UniversityZhuhai 519082China Guangdong Provincial Key Laboratory of marine Resources and Coastal Engineering Zhuhai 519082China South China Sea marine Survey Center Ministry of Natural ResourcesGuangzhou 510275China Key Laboratory of marine Environmental Survey Technology and Application Ministry of Natural ResourcesGuangzhou 510275China

The Ninety-East Ridge(NER)is located in the semioceanic to oceanic region of the southern Bengal Fan in the Northeast Indian *** sedimentary environment,ocean currents,and scientific issues related to climate change have always been the focus of *** well understand the sedimentary environment of the sea area,we studied the modern sedimentary environment of the NER by analyzing the redox-sensitive trace elements(RSEs)and biomarkers in the surface sediments of the northern region and both sides of the NER and the mechanism of their *** ratios of Mo/U(average 2.22),(Cu+Mo)/Zn(average 1.51),and the results ofδCe<1 of the sediment samples,all indicate the reduction of the sedimentary *** addition,the ratio of pristane(Pr)to phytane(Ph),C30diahopane to C30 hopane,and diasterane to sterane were low in all samples,on average of 1.03,0.9,and 0.33,*** analysis of RSE and biomarker data revealed that the sedimentary environment on seabed of the NER is generally a rare low-oxygen reduction *** the analysis of sediment characteristics,material sources,and ocean currents,we preliminarily constructed a genetic model for the low-oxygen reducing environment of surface sediments in the *** believe that the low-oxygen reduction environment of surface sediment in the NER could be influenced by multiple factors,such as terrestrial input of materials,productivity at sea surface,and sediment particle size.

关键词： Ninety-East Ridge(NER) surface sediment sedimentary environment redox-sensitive trace elements(RSEs) biomarker