LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Lin Wang,Feng Li,Sufang Wang,Jinsong Wu,Wenhui Zhang,Yan Zhang,Wentao Liu
The application of enzyme-inorganic hybrid nanoflowers in time-temperature indicators (TTIs) was studied for the first time. Lipase@Cu 3 (PO 4 ) 2 hybrid nanoflowers were prepared by the interaction between lipase and copper ions. Compared with free lipase, the activity of lipase in the nanoflowers was increased by 137%, and the storage stability was also improved significantly. Based on the enzymatic reaction between lipase and glycerol triacetate, six TTI prototypes with different concentrations of lipase@Cu 3 (PO 4 ) 2 hybrid nanoflowers were investigated. The color of the six TTIs changed from purple to yellow, and finally to green, and the activation energies were 46.86 kJ/mol, 51.17 kJ/mol, 54.99 kJ/mol, 60.00 kJ/mol, 62.17 kJ/mol, and 65.63 kJ/mol, respectively. The shelf life of TTIs can be determined by changing the ratio of lipase@Cu 3 (PO 4 ) 2 hybrid nanoflowers to glycerol triacetate, therefore the TTIs can be easily applied to real-time safety evaluation of many perishable foods.
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RSC Advances
·
2018
·Vol. 8
·期 5
·2357-2364
·
IF 2.936
Jianyun Yu,Xinxin Chen,Min Jiang,Anming Wang,Linlin Yang,Xiaolin Pei,Pengfei Zhang,Stephen Gang Wu
To develop an efficient and green immobilized biocatalyst for promiscuous catalysis which has a broad scope of applications, hybrid nanoflower (hNF) confined papain as a biocatalyst has been proposed and characterized in this study. hNFs were firstly prepared through mixing CuSO4 aqueous solution with papain in phosphate saline (PBS) at room temperature. The resulting hNFs were characterized by SEM and verified through a hydrolysis reaction with N-benzoyl-DL-arginine amide as substrate. Under optimal conditions, this nano-biocatalyst demonstrated a 15-fold hydrolytic activity compared with papain of free form, along with better thermal stability. A series of reaction factors (reaction temperature, time, and solvent) have been investigated for Knoevenagel condensation reactions with hNFs as catalyst. At optimal conditions, product yield of the hNFs catalyzed reaction was 1.3 fold higher than that of the free enzyme with benzaldehyde and acetylacetone as substrates. A few aldehydes and methylene compounds have also been used to test the generality and scope of this new enzymatic promiscuity. To sum up, the obtained hNFs demonstrate better catalytic properties than free papain and the inorganic metal-salt crystal can function as both support and promotor in biocatalysis.
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高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 39
·3911-3920
·
IF 3.532
Limin Yang,Xiaolong Zhang,Mingming Li,Linjiao Qu,Zhen Liu
Immobilization of enzymes is one of the key steps in the development of high-performance enzymatic electrochemical biosensors, and various nanostructured materials have been designed and developed to achieve this goal. Herein, hybrid nanoflowers (HNFs) were synthesized using acetylcholinesterase (AChE) as an organic component and copper phosphate (Cu3(PO4)2) as an inorganic component. These AChE–Cu3(PO4)2 HNFs exhibit a three-dimensional hierarchical flower-like structure, which not only has a large specific surface area but also promotes the affinity between AChE and its substrate with better catalytic activity. Not only that, the surface modification of the glassy carbon electrode (GCE) by the joint use of gold nanoparticles (AuNPs) and graphene oxide (GO) extended the electroactive area. Using square-wave voltammetry (SWV), the as-prepared biosensor (i.e., AChE–Cu3(PO4)2 HNF/AuNP/GO/GCE) demonstrated superior sensing performance in the detection of dichlorvos. The detection limit is as low as 0.07 pM, and the linear detection range can range from 0.5 pM to 10 μM. In addition, the biosensor was feasible in real agricultural samples with satisfactory recoveries (98.65% to 103.43%). The reported biosensor provides an alternative tool for the direct measurements of AChE activity and its inhibition. Besides organophosphorus pesticides represented by dichlorvos, this biosensor has the potential to detect other AChE inhibitors, such as carbamate pesticides, drugs for Alzheimer's disease, etc., thus having broader applications in food safety and drug screening.
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ACS Nano
·
2022
·
IF 18.027
Yuyue Mo,Feng Zhang,Hefeng Dong,Xingzhen Zhang,Shoujian Gao,Shenxiang Zhang,Jian Jin
Membrane fouling is a persistent and crippling challenge for oily wastewater treatment due to the high susceptibility of membranes to contamination. A feasible strategy is to design a robust and stable hydration layer on the membrane surface to prevent contaminates. A hydrogel illustrates a distinct category of materials with outstanding antifouling performance but is limited by its weak mechanical property. In this research, we report a reinforced hydrogel on a membrane by in situ growing ultrasmall hydrophilic Cu3(PO4)2 nanoparticles in a copper alginate (CuAlg) layer via metal-ion-coordination-mediated mineralization. The embeddedness of hydrophilic Cu3(PO4)2 nanoparticle with a size of 3–5 nm endows the CuAlg/Cu3(PO4)2 composite hydrogel with enhanced mechanical property as well as reinforced hydrate ability. The as-prepared CuAlg/Cu3(PO4)2 modified membrane exhibits a superior oil-repulsive property and achieves a nearly zero flux decline for separating surfactant stabilized oil-in-water emulsions with a high permeate flux up to ∼1330 L m–2 h–1 bar–1. Notably, it is capable of keeping similar permeate flux for both pure water and oil-in-water emulsions during filtration, which is superior to the currently reported membranes, indicating its super-antifouling properties.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 14
·4139-4147
·
IF 4.478
Ye Cui,Xu Songmin,Wu Zhen,Wang Minqiang
Propyl gallate (PG) as one of the most important additives has been widely used to prevent or slow the oxidation of foods in the food industry. In this work, Cu 3 (PO 4 ) 2 /BiVO 4 composite is synthesized through two hydrothermal processes. With visible light irradiation, the Cu 3 (PO 4 ) 2 /BiVO 4 composites modified PEC platform displays a superior anode photocurrent signal. The PEC sensor showed a wide linear range from 1 × 10 −10 to 1 × 10 −3 mol L −1 with a detection limit as low as 0.05 × 10 −10 mol L −1 . The Cu 3 (PO 4 ) 2 /BiVO 4 photoelectrochemical (PEC) sensor is designed and characterized by electrochemical impedance. Compared with GCE/BiVO 4 and GCE/Cu 3 (PO 4 ) 2 , the GCE/Cu 3 (PO 4 ) 2 /BiVO 4 has a higher photocurrent response. In addition, the sensor is highly selective for samples containing other antioxidants. Furthermore, the sensor can be used to detect PG in edible oil samples with satisfactory results. The recoveries of propyl gallate in edible oil ranged from 95.5 to 101.8%. The results show that Cu 3 (PO 4 ) 2 /BiVO 4 composites can be used to analyze PG in different edible oil samples, which are beneficial for food quality monitoring and reduce the risk of PG overuse in food. Graphical abstract
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高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2021
·
IF 3.493
Min Lu,Hao Zhang,Xu Wang,Hui Jiang,Guang Hu,Feng-Qing Yang
A simple, convenient and efficient enzyme immobilization method through phytic acid (PA) modified α-Glucosidase (α-Glu)/Cu 3 (PO 4 ) 2 ·3H 2 O hybrid nanoflower was developed. The structural properties of the materials were studied by several characterization techniques. Subsequently, the enzymatic reaction conditions such as the pH value and temperature were optimized, and the enzyme kinetics and inhibition parameters were determined. The PA modified α-Glu/Cu 3 (PO 4 ) 2 ·3H 2 O hybrid nanoflower had better enzymatic activity under a wide pH range and high temperature than the free one. After seven successive cycles, the PA modified α-Glu/Cu 3 (PO 4 ) 2 ·3H 2 O hybrid nanoflower could still maintain approximately 63.0 % of its initial immobilized enzyme activity. The Michaelis-Menten constant ( K m ) and the half-maximal inhibitory concentration (IC 50 ) of acarbose were determined as 0.77 mM and 15.01 μM, respectively. In addition, the material was applied to evaluate the inhibitory activity of ten phenolic compounds on α-Glu, and epicatechin gallate, gallocatechin gallate, epigallocatechin gallate and rosmarinic acid showed good inhibitory activity with % of inhibition of (53.42 ± 2.39)%, (37.28 ± 1.32)%, (37.08 ± 0.63)% and (35.53 ± 0.23)%, respectively. These results indicate that the PA modified hybrid nanoflower is an efficient method of α-Glu immobilization.
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高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Chunyun Ma,Yan Zhang,Chuankai Yang,Miaorong Zhang,Jianguo Tang
Lipase was immobilized with Cu 3 (PO 4 ) 2 ⋅3H 2 O to synthesize lipase-Cu 3 (PO 4 ) 2 ⋅3H 2 O hybrid microflowers (Lip-MFs). Surfactants (Tween 80, Triton X-100 and CTAB) were added to study their effect on the morphology and activity of Lip-MFs. SEM images revealed that surfactants can increase the size of Lip-MFs and make the hierarchical structure more compact. Further, compared with other surfactants, the activity of CTAB-Lip-MFs was 1.45 times of that of free lipase, demonstrating CTAB is conducive to improve the activity of lipase.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 9
·1687-1698
·
IF 4.3
Liu Cheng,Zheng Jingtian,Zhang Benxing,Zhong Xianhua,Wang Wei,Li Zhangyong
The Fenton reaction is one of the most effective methods for treating organic wastewater, which is extremely harmful to humans but difficult to treat. However, finding simple, low-cost, and efficient catalysts for the Fenton reaction remains a challenge. In this study, a BSA-Cu 3 (PO 4 ) 2 hybrid nanoflower (NF) was synthesized to investigate its peroxidase-like activity for the treatment of organic wastewater. Its morphology, composition, and crystallization had been fully studied and the results confirmed that the NFs were successfully prepared. Subsequently, the origin of the peroxidase-like activity of the NFs was further analyzed, with the results suggesting two reasons: (i) the transformation between Cu(I) and Cu(II) and (ii) nano-effects. Additionally, Congo red was selected as the organic pollutant to simulate the decolorization of wastewater. After 3 h, the decolorization efficiency reached 96%. Furthermore, the NFs exhibited good storage performance, maintaining approximately 90% relative activity after storage for 30 days. In summary, the NFs have great application prospects in the treatment of organic wastewater. Graphical abstract
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高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Nuan Feng,Haiyang Zhang,Yao Li,Yangkaixi Liu,Longquan Xu,Yi Wang,Xu Fei,Jing Tian
Milk allergenic proteins are the main reason of cow’s milk allergy. The most common method for removing milk allergenic proteins is enzymatic hydrolysis . However, the direct application of protease to hydrolyze allergens will lead to the introduction of new allergenic proteins. An ideal strategy for removing milk allergenic proteins without introducing new allergenic proteins is immobilization of protease. Herein, we established a simple method to synthesize a novel papain-Cu 3 (PO 4 ) 2 ·3H 2 O–magnetic nanoflowers (PCMNs). The PCMNs demonstrated 1556% higher activity than the free alkaline papain . Moreover, the PCMNs could hydrolyze most of allergenic proteins in cow’s milk, generating low-sensitive milk. In cycle analysis, the PCMNs also exhibited good reusability and were easily separated from the product.
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高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Xiaofeng Tan,Xiaoying Wang,Lianhua Zhang,Luyao Liu,Gengxiu Zheng,He Li,Feimeng Zhou
Polydopamine (PDA)-coated or encapsulating Cu3(PO4)2 (Cu3(PO4)2@PDA) nanosheets were synthesized, allowing the C-reaction protein (CRP) antibody to be attached electrostatically for immunosensing of CRP with simple photothermal detection. The antibody-covered Cu3(PO4)2@PDA nanosheets replace the antibody-conjugated enzyme in the enzyme-linked immunosorbant assays. Owing to the high surface area of the 2-D-structured Cu3(PO4)2@PDA nanosheets and the coabsorption of light in the near-IR spectrum by Cu3(PO4)2 and PDA, a small amount of Cu3(PO4)2@PDA confined in the wells of a titer plate generates an easily detectable temperature change after irradiation at 808 nm. The temperature changes, measured by an inexpensive pen-type thermometer, increased linearly with the analyte concentration from 0.42 to 16 pM. We found that the linear relationship can be fitted by the isotherm derived from responses collected from heterogeneous sensors covered with different ligand or antibody densities. The low detection limit (0.11 pM) is largely due to the attachment of a great number of antibodies onto the flat nanosheets. The antibody-covered Cu3(PO4)2@PDA nanosheets are stable and can be used under conditions that are generally unfavorable to enzymatic activities. The excellent agreement between our results and immunoturbidimetric assays of CRP in serum samples from patients and healthy donors demonstrates its utility for disease diagnosis in clinical settings. This cost-effective, biocompatible, and convenient photothermal immunosensor affords a range of possibilities for detecting diverse protein biomarkers.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xian Jiang,Bing Liu,Qinghong Zeng,Fuchao Yang,Zhiguang Guo
To alleviate the economic and environmental damage caused by industrial discharges of oily wastewater, materials applied for efficient oil/water separation are receiving significant attention from researchers and engineers. Among others, switchable wettable materials for bidirectional oil/water separation show great potential for practical applications. Inspired by mussels, we utilized a simple immersion method to construct a polydopamine (PDA) coating on a peony-like copper phosphate surface. Then, TiO2 was deposited on the PDA coating surface to build a micro–nano hierarchical structure, which was modified with octadecanethiol (ODT) to obtain a switchable wettable peony-like superhydrophobic surface. The water contact angle of the obtained superhydrophobic surface reached 153.5°, and the separation efficiency was as high as 99.84% with a flux greater than 15,100 L/(m2·h) after 10 separation cycles for a variety of heavy oil/water mixtures. Notably, the modified membranes have a unique photoresponsiveness, transforming to superhydrophilic upon ultraviolet irradiation, achieving separation efficiencies of up to 99.83% and separation fluxes greater than 32,200 L/(m2·h) after 10 separation cycles for a variety of light oil/water mixtures. More importantly, this switch behavior is reversible, and the high hydrophobicity can be restored after heating to achieve efficient separation of heavy oil/water mixtures. In addition, the prepared membranes can maintain high hydrophobicity under acid–base conditions and after 30 sandpaper abrasion cycles, and damaged membranes can be restored to superhydrophobicity after a brief modification in the ODT solution. This simple-to-prepare, easy-to-repair, robust membrane with switchable wettability shows great potential in the field of oil/water separation.
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Nano Research
·
2023
·
IF 9.9
Yang Limin,Qu Linjiao,Zhang Xiaolong,Li Mingming,Liu Zhen
Enzyme-inorganic hybrid nanoflowers (HNFs) have shown excellent sensing capabilities due to their large specific surface area as well as the simplicity and mildness of the preparation process. However, coupling HNFs to electrodes to fabricate a uniform and controllable enzymatic electrochemical sensing interface remains a challenge. Here, we proposed an aptamer-induced in-situ fabrication strategy for preparing an HNF-based electrochemical sensor with ideal performance. Central to this strategy is the introduction of acetylcholinesterase (AChE)-specific binding aptamer (Apt), which induces the in-situ growth of AChE-copper phosphate (Cu 3 (PO 4 ) 2 ) HNFs on the surface of carbon paper (CP). In addition, a dense gold nanoparticle (AuNP) layer was electrodeposited on the CP for anchoring Apt and further extending the electroactive surface area. The prepared AChE-Cu 3 (PO 4 ) 2 HNF/Apt/AuNP/CP biosensor exhibited a wide detection range from 1 to 10 7 pM for the four organophosphorus inhibitors, including isocarbophos, dichlorvos, methamidophos, and parathion, with detection limits down to 0.016, 0.028, 0.071, and 0.113 pM, respectively. With the reactivation of pralidoxime chloride, the electrode can still recover 98.1% of the response after five times of repeated use. In real sample detection, the biosensor achieved high recoveries from 96.45% to 100.13%. The detection target may be extendable to other AChE inhibitors (e.g., drugs for Alzheimer’s disease). This study demonstrates for the first time the feasibility of using aptamers as an inducer to fabricate an electrochemical enzyme sensing interface in-situ . This strategy can be used to fabricate other enzyme-based biosensors and therefore has broader applications.
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