Food Bioscience
·
2024
·
IF 4.8
Yuyang Zhang,Ting Feng,Xing Ni,Jiaojiao Xia,Hongbo Suo,Lishi Yan,Bin Zou
In this study, Candida rugosa lipase (CRL) was immobilized on the silica carrier SBA-15 by physical adsorption , then mixed with hydrophobically modified sodium alginate and dropped into calcium chloride solution. Finally, the adsorption-embedding immobilized lipase (L-SBA-15-Mgel) was successfully prepared. The conformation of the carrier before and after lipase immobilization were analyzed by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR) and other characterization techniques. The molecular docking and molecular dynamics simulation of CRL and modifier dodecyl glycidyl ether (DGE) ligand were carried out to analyze the potential influence of modifier on enzyme characteristics. The basic enzymatic properties including the activity, stability and reaction kinetic parameters of the immobilized lipase L-SBA-15-Mgel were studied. L-SBA-15-Mgel showed good storage stability and reusability. After 16 days of storage, the activity retention was 47.85%, and there was still 63.20% of the residual activity after seven cycles of reuse. The immobilized lipase was applied to the efficient synthesis of food flavor ester isoamyl acetate . Under the reaction conditions of 50 °C and 200 rpm, the highest yield of isoamyl acetate catalyzed by L-SBA-15-Mgel was 85.19%.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Yan-Yun Meng,Qing-Da An,Zuo-Yi Xiao,Shang-Ru Zhai,Zhan Shi
Through hydrothermal synthesis and impregnation-reduction processes, a series of Pd-based nanocomposites using N-doped carbon layers coated ZrSBA-15 as the supports have been manufactured, aiming to upgrade the catalytic activity and stability of the catalysts. Pentaethylenehexamine (PEHA) was served as a nitrogen source to generate N-doped carbon (CN) layers that were pre-deposited into the acidic platelet framework ZrSBA-15, and then followed by introducing Pd 0 nanoparticles (NPs) onto it, finally leading to the formation of target composite Pd/CN-ZrSBA-15. The samples were characterized by XRD , TEM, SEM, N 2 adsorption-desorption isotherm, FTIR, XPS etc. The catalytic performance of as-prepared catalysts was evaluated by the aerobic oxidation of benzyl alcohol and the reduction of 4-NP, respectively. Duo to the platelet-like morphology with shortened channels and the modification of N-doped carbon layers, which could effectively decrease pore blocking in the process of preparation and reactions as well as enhance the metal-support interaction, the derived catalysts could afford 85% conversion of benzyl alcohol and 100% selectivity of benzaldehyde, and the conversion of 4-NP was also up to 96%. More remarkably, the catalysts could be reused at least ten times without significantly loss in catalytic activity.
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RSC Advances
·
2012
·Vol. 2
·期 9
·3753-3758
·
IF 0
Jing Ma,Jia Chu,Liangsheng Qiang,Juanqin Xue
Bi-doped TiO2/SBA-15 (Bi–TiO2/SBA-15) was synthesized by a wet impregnation method. It was found that SBA-15 retained its ordered hexagonal mesostructure after incorporation of TiO2 and Bi. TiO2 nanoparticles and Bi species dispersed well and anchored both in the channel and the wall of SBA-15. The photocatalytic activity was evaluated on photodegradation of Rhodamine B (RhB) under visible light irradiation (λ ≥ 420 nm). Experimental results indicated that Bi–TiO2/SBA-15 exhibited higher photocatalytic activities than pure TiO2 and TiO2/SBA-15 owing to the synergetic effects of Bi species and TiO2. The degradation of RhB by these catalysts follows the pseudo-first-order kinetic model and Bi–TiO2/SBA-15 (2.0%) was found to be the best. The effect of Bi doping on the photocatalytic activity was investigated by the density functional theory (DFT) method. The calculated results indicated that Bi doping could improve the photocatalytic activity by extending the spectral response from UV to the visible region, making the Bi–TiO2/SBA-15 active under visible light irradiation.
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JOURNAL OF FOOD PROTECTION
·
2015
·
IF 1.849
Heng Yu Li,Xin Chao Liu,Xu Bo Chen,Qi Zhi Liu,Zhi Long Liu
Water-distilled essential oil from Clinopodium chinense (Labiatae) aerial parts at the flowering stage was analyzed by gas chromatography-mass spectrometry. Thirty-five compounds, accounting for 99.18% of the total oil, were identified, and the main components of the essential oil of C. chinense were spathulenol (18.54%), piperitone (18.9%), caryophyllene (12.04%), and bornyl acetate (8.14%). Based on bioactivity-directed fractionation, bornyl acetate, caryophyllene, and piperitone were identified from the essential oil. The essential oil possessed fumigant toxicity against booklice (Liposcelis bostrychophila) with a 50% lethal concentration (LC 50 ) value of 423.39 μg/liter, while the isolated constituents, bornyl acetate and piperitone, had LC 50 values of 351.69 and 311.12 μg/liter against booklice, respectively. The essential oil also exhibited contact toxicity against L. bostrychophila with an LC 50 value of 215.25 μg/cm 2 . Bornyl acetate, caryophyllene, and piperitone exhibited acute toxicity against booklice with LC 50 values of 321.42, 275.00, and 139.74 μg/cm 2 , respectively. The results indicated that the essential oil and its isolated constituents have potential for development into natural insecticides or fumigants for control of insects in stored grains.
研究领域:
植物学
·
昆虫学
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WEED SCIENCE
·
2017
·Vol. 64
·期 4
·634-641
·
IF 1.862
Hongchun Wang,Bing Zhang,Liyao Dong,Yuanlai Lou
The influence of temperature, light, solution pH, water stress, salt stress, and burial depth on seed germination and seedling emergence of catchweed bedstraw and the sensitivity of that weed to commonly available herbicides in China were studied in laboratory and greenhouse. Germination occurred at day/night temperatures from 5/0 C to 30/25 C, with optimum germination at 15/10 C. Catchweed bedstraw germinated equally well under a 12-h photoperiod and continuous darkness; however, a 24-h photoperiod inhibited seed germination. Catchweed bedstraw seed is moderately sensitive to osmotic potential and salt stress, with 15 and 3% germination rates at an osmotic potential of −0.5 Mpa and salinity level of 120 mM, respectively. Maximum seed germination was observed in near neutral pH; germination was greater than 80% over a broad pH range from 5 to 8. Seedling emergence of the seeds buried at a depth of 1 cm was higher (74%) than those placed on the soil surface (20%), but declined with burial depth increasing. Few (10%) seedlings emerged when seeds were placed at a depth of 5 cm. Bensulfuron-methyl, and ethametsulfuron-methyl applied PRE and tribenuron-methyl, fluroxypyr, and florasulam applied POST can be used to provide greater than 80% control of catchweed bedstraw. The results of this study have contributed to more complete understanding of the germination and emergence of catchweed bedstraw.
研究领域:
植物学
·
杂草科学
·
生态生理学
·
农业生态学
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高影响因子
SUPRAMOLECULAR CHEMISTRY
·
2011
·
IF 1.94
Jing Cao,Jun Xiang Feng,Yong Xiang Wu,Xue Qun Pei,Jiao Jiao Yan,Yang Liu,Wen Jie Qin,Xiao Bin Zhang
A novel 15-aza-5-crown ether linked to styryl chemosensory 13-(4-((9H-fluoren-9-ylidene)methyl)-2-nitrophenyl)-1,4,7,10-tetraoxa-13-azacyclopentadecane was designed and synthesised, it would not occur during photoisomerisation under radiation of light but shows special capability of selectively recognising for Sr2+.
研究领域:
化学
·
材料科学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yanmei Li,Wufeng Wu,Yali Zhao,Yanying Wei,Haihui Wang
Interfacial incompatibility between inorganic fillers and polymer matrix remains a major challenge in developing high-performance zeolite-based mixed matrix membranes (MMMs), especially for the ones employing high-aspect-ratio two-dimensional (2D) nanosheets as fillers owing to the consequently enlarged interfacial area. Herein, a thermally induced crosslinking strategy is proposed to construct covalent Si– O –C linkages between RUB-15 nanosheets with abundant hydroxy groups and a polyimide (PI) matrix, effectively eliminating interfacial defects. Due to the improved interfacial compatibility, the membrane gas separation performance is significantly enhanced, presenting a He permeability of 87 Barrer with an impressive He/CH 4 selectivity of 357, ∼3.2 times as high as that before crosslinking. Furthermore, excellent separation stability is maintained over ten thermal cycling tests, demonstrating superior durability. This study presents a universal and efficient interfacial engineering strategy for fabrication of robust high-aspect-ratio 2D zeolite-based MMMs and highlights its significant potential in advancing next-generation gas separation technologies.
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JOURNAL OF ANALYTICAL CHEMISTRY
·
2026
·Vol. 81
·期 5
·854-862
·
IF 1.5
Pak Ryon-Hui,Pak Hyon-Tae,Jon Chol-San,Kim Yu-Jong,Song Jong-Gu,Pak Yong-Gil,Kim Song-Ryong
A method of in-syringe solid-phase extraction ( SPE ) using carbon fiber modified with Santa Barbara amorphous-15 ( CF-SBA-15 ) as an adsorbent, coupled with gas chromatography-mass spectrometry, was developed for the determination of benzene derivatives in seawater samples. Carbon fiber was modified with amine-functionalized SBA-15 to prepare CF-SBA-15 through covalent functionalization. Fabricated CF-SBA-15 was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction, confirming the successful modification of CF with SBA-15 and its ordered hexagonal mesoporous structure. As a novel in-syringe SPE adsorbent, it was used for the determination of 12 benzene derivatives by gas chromatography-mass spectrometry. Benzene derivatives could be completely adsorbed on CF-SBA-15 during one adsorption cycle, indicating effective extraction with a short time. Under the optimized extraction and elution conditions, the linear ranges were 0.1–500 ng/mL with regression coefficients above 0.9960, the limits of detection were 0.008–0.25 ng/mL, and intra- and inter-day relative standard deviation values were below 12.8% in standard and seawater samples. The enrichment factor ( EF ), recovery ( R ), and matrix effect ( ME ) were investigated, indicating that CF-SBA-15 is selective and quantitative for the extraction of all analytes (EF: 17.1–19.4, R: 85.6–96.8%, and ME: 86.0–110.5%). The proposed method was applied to the determination of benzene derivatives in seawater samples.
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JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 22
·期 5
·2263-2270
·
IF 5.101
Qi Zheng,Yongheng Zhu,Jiaqiang Xu,Zhixuan Cheng,Huimin Li,Xinxin Li
Two new mesoporous SBA-15/organic hybrids featuring fluoroalcohol and fluorinated-phenol derivatives were successfully synthesized via a co-condensation route. Hexafluorobisphenol and hexafluoroisopropanol were chosen to graft onto mesostructured silica, respectively. The as-synthesized hybrids preserve their mesoscopic structures with relative large surface areas and pore volume, as confirmed by SAXS, TEM and N2 adsorption–desorption porosimetry. Moreover, FT-IR and solid-state MAS NMR spectroscopy proved covalent anchoring of the organic functional groups onto the SBA-15. In order to confirm the potential application of the hybrids in gas sensing, investigations on the sensing properties toward the nerve agent simulant dimethyl methylphosphonate (DMMP) were carried out by QCM transducer. The QCM sensors based on hybrid materials exhibit excellent sensitivity toward trace DMMP vapour down to 26 ppb. In comparison with pristine SBA-15, the hybrids also show remarkably enhanced selectivity to DMMP due to suitable H-bonding interactions. Therefore, the well-defined mesoscopic porosity of the organic–inorganic hybrids together with the grafted fluoroalcohol and fluorinated-phenol derivatives lead to excellent sensing properties to DMMP vapour, and show great potential in the area of nerve agent detection.
研究领域:
材料科学
·
化学传感器
·
无机化学
·
分析化学
·
纳米材料
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高影响因子
LIQUID CRYSTALS
·
2014
·
IF 2.349
Hongyu Guo,Jinqi Ye,Fafu Yang
Two novel triphenylene liquid crystals with 15-crown-5 unit as side-chain 4a and 4b were designed and synthesised by simple procedures in ideal yields. Their structures were confirmed by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (1H NMR), electrospray ionization mass spectrometry (ESI-MS) and elemental analysis. Their liquid-crystalline behaviours before and after complexation with metallic salts were studied by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. Neat compounds 4a and 4b show mesophase with triphenylene column, while complexes of 4a and 4b with metallic salts exhibit no mesophase but higher melting point.
研究领域:
材料科学
·
液晶化学
·
有机合成
·
超分子化学
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2013
·
IF 1.913
Peng Dai,Lili Zhang,Guang Li,Zhaoqi Sun,Xiansong Liu,Mingzai Wu
Different loadings of SnO 2 nanoparticles embedded in mesoporous silica (SBA-15) were prepared via a two-solvent method with the ordered hexagonal mesoporous structure of SBA-15 kept. X-ray diffraction, transmission electron microscope, X-ray photoelectron spectroscopy and N 2 adsorption porosimetry were employed to characterize the nanocomposites. Compared with pure SnO 2 nanoparticles, the SnO 2 /SBA-15 nanocomposites show higher response to H 2 at lower operating temperature. The photocatalytic activity of as-prepared SnO 2 /SBA-15 for degradation of methylene blue was investigated under UV light irradiation and the results show that the SnO 2 /SBA-15 nanocomposites have higher photodegradation ability toward methylene blue than pure SnO 2 nanoparticles.
研究领域:
材料科学
·
纳米科技
·
环境催化
·
传感器技术
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高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2026
·
IF 3.3
Qiang Xian,Weijie Fan,Yulin Gu,Zishan Zhang,Jiaqi Liu,Hui Xian,Li Chen,Hui Dan,Yi Ding
New SnS@SBA-15 was developed for the efficient adsorption and storage of iodine. • The iodine adsorption capacity was up to 2062 mg/g. • The iodine adsorption mechanism was chemical adsorption (SnS + I 2 → SnI 4 + S). • The retention rate of adsorption product SnI 4 was up to 76.5% after storage for 90 d. • Stable iodine storage was due to the in-situ reconstructed hydrophobic environment. Tin-based materials are expected to be excellent iodine adsorbent, but the stability of the adsorption product (SnI 4 ) poses challenge. Herein, a novel strategy based on the in-situ reconstruction of hydrophobic environment was presented for efficient iodine adsorption and storage. Stannous sulfide@mesoporous silica (SnS@SBA-15) was developed and employed for the adsorption of I 2 gas. The optimal material, SnS@SBA-15–50wt%, exhibited an excellent iodine uptake of 2062 mg/g. The adsorption was attributed to a chemical reaction (SnS + 2I 2 = SnI 4 + S). Notably, the retention rate of SnI 4 was as high as 76.5% after storage in air for 90 days due to the in-situ reconstructed hydrophobic environment. The obtained SnS@SBA-15 exhibited efficient iodine adsorption and excellent storage ability. This work presents a novel strategy to design iodine adsorbents, aimed at addressing the storage challenges of iodine adsorption products susceptible to hydrolysis. Download: Download high-res image (214KB) Download: Download full-size image
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