AQUATIC TOXICOLOGY
·
2021
·
IF 4.964
Zhaohui Wang,Chaofan Wang,Weiguo Li,Maoting Wang,Lijuan Xiao
Interactions between Scrippsiella acuminata and three diatoms, Chaetoceros curvisetus, Phaeodactylum tricornutum , and Skeletonema dohrnii , were investigated using bi-algal co-cultures and cell-free and sonicated-cell filtrates in this study. Volatile aldehydes in sonicated filtrates of the three diatoms were analyzed by GC/MS. Furthermore, effects of 2E, 4E-decadienal (2,4-D) on the growth and the photosynthetic efficiency of the four microalgal species were studied. The growth of Sc. acuminata was significantly inhibited by the three diatoms in all co-cultures, and the inhibitory effects were higher under nutrient-rich conditions. Both cell-free and sonicated-cell filtrates of the three diatoms showed significant inhibitions on the growth of Sc. acuminata , which highlighted that diatoms produce allelopathic compounds not only to the surrounding environments but also inside the cells. Fifteen aldehydes were detected in the sonicated-cell filtrates of the three diatoms, and 5, 5, and 12 types of aldehydes were detected in C. curvisetus, P. tricornutum , and Sk. dohrnii , respectively. Polyunsaturated aldehydes (PUAs) composition differed among the three diatom species. Phenylglyoxal (C 8 H 6 O 2 ) dominated in C. curvisetus , 2,4-D (C 10 H 16 O) predominated in P. tricornutum , and high proportions of 2-hexenal (C 6 H 10 O), 2E, 4E-heptadienal (C 7 H 10 O), and 2,4-D were detected in Sk. dohrnii . 2,4-D showed significantly inhibitory effects on the growth of algal cells including diatoms themselves in a dose-dependent manner, and photosynthetic efficiency was significantly decreased as well. Sc. acuminata was the most sensitive species. The 96 h EC 50 values of 2,4-D on the growth of the four microalgae were 1.64 μmol/L for Sc. acuminata , 3.09 μmol/L for C. curvisetus , 4.93 μmol/L for P. tricornutum , and 8.54 μmol/L for Sk. dohrnii , respectively. The results suggest that PUAs produced by diatoms may help them to take the competitive advantages in phytoplankton community, and thus to sustain diatom-dominated community structure in nutrient rich coastal waters.
研究领域:
海洋生物学
·
生态学
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DOI
PubMed
高影响因子
PROGRESS IN OCEANOGRAPHY
·
2016
·
IF 3.512
Zhengchao Wu,Qian P. Li
This study reports the first comprehensive exploration of the spatial patterns of dissolved and particulate polyunsaturated aldehydes (PUAs), their physical and biological controlling factors, and their potential biogeochemical influences in the Pearl River Estuary (PRE) of the northern South China Sea (NSCS). High levels of total particulate PUAs (0–41 nM) and dissolved PUAs (0.10–0.37 nM) were observed with substantial spatial variation during an intense summer phytoplankton bloom outside the PRE mouth. We found the particulate PUAs strongly correlated with temperature within the high chlorophyll bloom, while showing a generally positive correlation with chlorophyll- a for the entire region. Additionally, the Si/N ratio significantly correlated with the particulate PUAs along the estuary suggesting the important role of silica on PUA production in this region. The dissolved PUAs counterparts exhibited a positive correlation with chlorophyll- a within the high chlorophyll bloom, but a negatively one with temperature outside, reflecting the essential bio-physical coupling effects on the dissolved PUAs distributions in the ocean. Biogeochemical implications of PUAs on the coastal ecosystem include not only the deleterious restriction of high PUAs-producing diatom bloom on copepod population, but also the profound influence of particulate PUAs on the microbial cycling of organic carbon in the NSCS.
研究领域:
海洋生物学
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生态学
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生物地球化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 22
·11442-11447
·
IF 11.301
Qinglin Liu,Yinle Li,Yanan Fan,Cheng-Yong Su,Guangqin Li
Selective hydrogenation of α,β-unsaturated aldehydes to achieve high selectivity towards a desirable product is still a great challenge mainly because of the complex conjugate system. Herein, Rh nanoclusters encapsulated in MIL-101 (Cr), synthesized by the double solvent method, are able to selectively hydrogenate CC of cinnamaldehyde, an α,β-unsaturated aldehyde and achieve over 98% selectivity with a conversion of 98% to a saturated aldehyde under mild conditions. Fourier transform infrared spectroscopy confirms that MIL-101 acts as an aldehyde protector to suppress the reactivity of CO, and the X-ray photoelectron spectroscopy (XPS) data indicate that the electropositive Rh, owing to the electron transfer from Rh to MIL-101, preferentially absorbs CC rather than CO leading to improvement of the selectivity towards saturated aldehydes. In addition, Rh@MIL-101 can also efficiently catalyse hydrodefluorination of aryl fluorides with good stability. This work provides a basic strategy to develop other selective heterogeneous catalysts via structural modulation for synergetic catalysis.
研究领域:
催化化学
·
材料科学
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产品关联
DOI
高影响因子
Journal of Oceanology and Limnology
·
2019
·Vol. 37
·期 5
·1566-1581
·
IF 0
Shang Lixia,Hu Zhangxi,Tang Yingzhong
Carbonyl compounds, especially polyunsaturated aldehydes (PUAs), are increasingly reported as teratogenic to grazers and deleterious to phytoplankton. While PUAs have been considered to be mainly produced by diatoms after cell wounding, little is known about whether microalgae other than diatoms, particularly harmful algal bloom (HAB)-forming species, produce carbonyl compounds. In this study, we analyzed the carbonyl compounds from eight common HAB-forming species ( Akashiwo sanguinea, Karenia mikimotoi, Karlodinium veneficum, Margalefidinium polykrikoides, Prorocentrum donghaiense, P. minimum, Scrippsiella trochoidea , and Heterosigma akashiwo ) using gas chromatography-mass spectrometry in full scan and selected ion monitoring (SIM) modes. Our results show a ubiquitous presence of carbonyl compounds in both dissolved and particulate forms in all species we examined. In the full scan mode, 133 chromatographic peaks were detected from 51 samples altogether. Both the varieties of carbonyl compounds and their quantities were algal species dependent, although most of the carbonyl compounds could not be fully identified according to the mass spectral database only due to the unavailability of enough standards for all analytes. Aided with nine standards in SIM mode, we further identified and quantified all nine aldehydes (2-methyl-2-pentenal, trans-2-nonenal, cis-6-nonenal, 2,6-dimethyl-5-heptenal, trans-2-hexenal, trans-2-decenal, 2,4-heptadienal, trans-trans-2,4-octadienal, and trans-trans-2,4-decadienal). Four of these nine aldehydes were detected in particulate form, which confirmed that trans-2-nonenal could be produced by K. mikimotoi, Karl. veneficum, P. donghaiense, P. minimum, S. trochoidea , and H. akashiwo , 2,4-heptadienal and trans-trans-2,4-decadienal by A. sanguinea, M. polykrikoides , and S. trochoidea , and trans, trans-2,4-octadienal by S. trochoidea , respectively. We proved that some dinoflagellate and raphidophyte species could contribute to the pool of carbonyl compounds including PUAs in a marine ecosystem. Some carbonyl compounds, particularly those in high cell quota and/or dissolved concentration, may be related to fish-killing or allelopathy which needs further identification and quantification.
研究领域:
海洋生物学
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生态毒理学
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产品关联
DOI
Nanoscale
·
2025
·
IF 5.1
Jiasheng Wang,Tianyu Zhang,Jiliang Song,Fengxin Zhang,Hong Liu,Wan-Hui Wang,Ming Bao
Unsaturated alcohols (UOLs) are important fine chemical intermediates. Thus, it is of great significance to design and prepare catalysts for highly selective hydrogenation of CO of α,β-unsaturated aldehydes (UALs). In this paper, a fluffy mesoporous Al2O3-supported Ag–In2O3 catalyst (Ag-In2O3/f-m-Al2O3) was synthesized by employing a two-solvent method, in which Ag and In2O3 form a Mott–Schottky junction and lead to electron transfer from In2O3 to Ag. Electron-rich Ag repels the CC bond owing to “four-electron repulsion”, and electron-deficient In2O3 acts as the electrophilic site to adsorb the O atom of the CO bond, thus improving the selectivity towards UOLs. In addition to a larger specific surface area and smaller mass transfer resistance, the fluffy mesopore Al2O3 exhibits a large number of Lewis acid sites, which can further improve UOL selectivity. With the help of Ag–In2O3/f-m-Al2O3, high UOL selectivity can be obtained from UALs containing aliphatic, aromatic and heterocyclic groups. This elaborate design of the catalyst could contribute to the highly selective hydrogenation of UALs to UOLs.
研究领域:
催化化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2019
·Vol. 10
·期 2
·277-287
·
IF 2.326
Shi Ning,Liu Qiying,Cen Hu,Ju Rongmei,He Xiong,Ma Longlong
Humins are undesired solids formed during the hydrothermal degradation of carbohydrates. In order to reveal the mechanism of formation of humins, we studied the degradation behavior of 11 model compounds including carbohydrates and furfural derivatives, within water and various pure organic solvents as reaction media. All the studied carbohydrates could generate solid humins in both water and studied organic solvents except ethanol, while the furfural derivatives could generate solid humins in only water. The results could be explained by regarding the formed α-carbonyl aldehydes and α,β-unsaturated aldehydes as primary precursors for formation of humins. Furfural derivatives could generate chain α-carbonyl aldehydes (for example, 6-hydroxy-2,5-dioxohexanal from 5-hydroxymethylfurfural and 2-oxopentanedial from furfural) through hydrolytic ring opening reaction; thus, water is essential for these furfural derivatives to generate humins. As for carbohydrates, they could generate α-carbonyl aldehydes and α,β-unsaturated aldehydes through simple step of β-elimination in all solvents; thus, they could form humins in both water and studied organic solvents except ethanol. Ethanol could react with α-carbonyl aldehydes by acetalization; thus, the condensation between α-carbonyl aldehydes was suppressed in ethanol, leading to few humins formation from carbohydrates. Based on the above analysis, we proposed that the formed α-carbonyl aldehydes and α,β-unsaturated aldehydes should be the primary precursor of humins.
研究领域:
生物化学
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能源化学
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产品关联
DOI
高影响因子
MONATSHEFTE FUR CHEMIE
·
2024
·Vol. 155
·期 7
·731-738
·
IF 1.7
Shi Huibing,Wang Peng,Yan Yaozong,Yang Guiai,Wu Haigang
Rh-catalyzed tandem hydroformylation/isomerization/hydrogenation of various 1-arylbutadienes toward the corresponding branched saturated aldehydes were performed in the presence of monodentate phosphine ligand PPh 3 . After investigating different reaction parameters such as P-ligands and solvents, the conversion of substrates (including electron withdrawing and electron donating groups on aromatic rings, up to 99%) and chemical/regioselectivity of the target products (up to 98% and 99/1 for B/L) were improved using DMF as solvent. The [Rh(cod)Cl] 2 /PPh 3 catalytic system had good substrate universality in terms of substituents on the phenyl ring and provided a simple synthesis method for branched saturated aldehydes. Graphical abstract
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yangyang Zhou,Chen Chen,Qiling Li,Yanbo Liu,Ting Wei,Youzhen Liu,Zebing Zeng,Darren Bradshaw,Bing Zhang,Jia Huo
Hydrogenation of unsaturated biomass in a control manner is highly desirable but challenging, especially under mild conditions. We here report selective hydrogenation of α,β-unsaturated aldehydes (UALs), featuring a precise control of all potential products by adjustment of the role of ammonia borane (AB) in transfer and/or catalytic hydrogenation. The hydrogenation can be readily operated in neat water without using any external H 2 -source, because AB as the H 2 -source is favorable in aqueous solution. Impressively, unsaturated alcohols are prepared in 100% conversion by the room-temperature transfer hydrogenation of UALs with AB, while saturated aldehydes are obtained in 100% conversion and > 90% selectivity with high activity ( i.e ., turnover frequency = 0.98 s −1 for cinnamaldehyde), by the catalytic hydrogenation with H 2 released from AB and Pd immobilized on two-dimensional metal organic layer. On the other hand, UALs can be completely converted into the saturated alcohols through a combination of transfer and catalytic hydrogenation in one pot. This strategy can be extended to more than 8 types of UALs, and provides a facile way to fine-control the selective hydrogenation of unsaturated compounds with competing bonds.
研究领域:
化学
·
生物质能
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Kaiyu Jiang,Wei Gong,Yu-Xuan Liang,Juncai Tu,Jinjin Li,Weiman Gao,Xiuping Dong,Beiwei Zhu
To investigate the effects of processing temperatures on α, β-unsaturated aldehyde-mediated modifications of cod protein, a clickable probe, 4-(2-Propyn-1-yloxy)-2-butenal (yne-ACR), was developed to simulate α, β-unsaturated aldehyde modifications on cod protein in simulated processing systems (25 °C, 90 °C, and 180 °C). Processing at 180 °C resulted in a 3-fold increase in the hydrophobicity, while modifications under thermal processing had limited effects on the content of free nucleophilic amino acids. However, modification at 180 °C significantly increased the content of carbonylated proteins to 14.7 nmol/mg protein. Cod protein modified during thermal processing (90 °C and 180 °C) exhibited superior emulsifying and foaming properties than those subjected to heating alone. Cod protein processed at 90 °C exhibited 757 identified modified components, representing the highest number among the three processing temperatures, and thermally induced structural changes in cod protein facilitated multiple modifications on a single peptide. These findings provide new tools and insights for the study of food protein modification.
研究领域:
食品科学
·
生物化学
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产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2016
·Vol. 7
·期 47
·7216-7222
·
IF 5.687
Yan Li,Cheng Chen,Jinlong Wu,Xiangxiang Jia,Yufan Lu,Fangjuan Chen,Lijian Liu
Copolymerization between alkyl diazoacetates and α,β-unsaturated aldehydes, which is a one-pot, one-step and catalyst-free reaction, is presented. The product is a ternary copolymer composed of an alkyl diazoacetate, an α,β-unsaturated aldehyde and an α-carbalkoxy carbene, which is derived from the alkyl diazoacetate by the release of N2. Thus, the reaction is named as the C1N2/C2/C1 copolymerization. Various diazoacetates and α,β-unsaturated aldehydes were utilized to establish the methodology. The products are down-/up-conversion fluorescence molecules that can significantly enhance cell imaging through the synchronized excitation of near-ultraviolet and near-infrared light and may be widely used in other optical fields. The up-conversion fluorescence is the result of a two-photon excitation process.
研究领域:
有机化学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Tianyi Huang,Jiajia Wu,Yongqi Pan,Zhiyuan Yu,Fangyu Zhao,Shafqat Ullah,Yang Xu,Yong Chen,Zhehao Sun,Zongyou Yin,Qiangqiang Xue,Sibudjing Kawi,Shuliang Lu,Yujun Wang,Guangsheng Luo
The hydrogenation of the C=C bond in α-β unsaturated aldehydes faces substantial difficulties due to the steric hindrance and the conjugation effects of macromolecular unsaturated aldehydes. Herein, we introduce a novel approach to prepare nanosheet-structured Ni-Al 2 O 3 catalysts featuring exposed {100} crystal planes and hydroxyl groups, utilizing a microfluidic system to easily control crystal plane growth achieve support modification. In-situ characterizations and DFT calculations reveal that the exposed {100} crystal plane, a strong metal-support interaction (SMSI) promotes electron transfer of Ni and significantly reducing the C=C hydrogenation energy barrier from 3.12 eV to 1.79 eV. The hydroxyl environment facilitates effective adsorption of the C=O bond, accelerating the reaction and enabling rapid desorption of the product. Under modified reaction conditions for the preparation of 2-ethylhexanol, the catalyst still achieved a yield of 99.9%. This simple method of support modification enables rapid large-scale preparation, possessing significant potential for industrial applications.
研究领域:
催化化学
·
材料科学
·
理论计算化学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 4
·999-1007
·
IF 4.4
Ziling Liu,Jipeng Wang,Xiaoqian Gao,Yadong Bi,Chen Guo,Xinli Tong
Selective catalytic reduction of α,β-unsaturated aldehydes plays a significant role in the present chemical industry. In this article, a series of high entropy catalysts were prepared and employed to catalyze the hydrogen transfer reaction of furan-2-acrolein in alcoholic solvents. As a result, the catalyst containing inexpensive Cu, Co, Al, Ni, and Fe elements exhibited outstanding performance, in which more than 99.9% conversion and 93.3% selectivity to 2-furan propanol are obtained in the presence of the CuCoAlNiFeOx catalyst; meanwhile, the furan ring-hydrogenated products 3-(tetrahydrofuran-2-yl)propanal and 3-(tetrahydrofuran-2-yl)propan-1-ol are mainly generated using CuCoAlNiFe-250R as the catalyst. Based on the results of control experiments and catalyst characterization, it is concluded that the synergistic effect between the five different metal elements is very crucial to the prominent catalytic activity. Moreover, the presence of metal Cu is advantageous for the hydrogenation of the side chain CC and CO bonds, while the reduced state Ni is responsible for the hydrogen transfer reduction of the furan ring. This study provides an economical and facile approach for the selective reduction of aromatic α,β-unsaturated aldehydes and biomass-derived furanic derivatives.
研究领域:
催化化学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）