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Ozen B, Cavdaroglu C, Tokatli F. Trends in authentication of edible oils using vibrational spectroscopic techniques. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:4216-4233. [PMID: 38899503 DOI: 10.1039/d4ay00562g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
Abstract
The authentication of edible oils has become increasingly important for ensuring product quality, safety, and compliance with regulatory standards. Some prevalent authenticity issues found in edible oils include blending expensive oils with cheaper substitutes or lower-grade oils, incorrect labeling regarding the oil's source or type, and falsely stating the oil's origin. Vibrational spectroscopy techniques, such as infrared (IR) and Raman spectroscopy, have emerged as effective tools for rapidly and non-destructively analyzing edible oils. This review paper offers a comprehensive overview of recent advancements in using vibrational spectroscopy for authenticating edible oils. The fundamental principles underlying vibrational spectroscopy are introduced and chemometric approaches that enhance the accuracy and reliability of edible oil authentication are summarized. Recent research trends highlighted in the review include authenticating newly introduced oils, identifying oils based on their specific origins, adopting handheld/portable spectrometers and hyperspectral imaging, and integrating modern data handling techniques into the use of vibrational spectroscopic techniques for edible oil authentication. Overall, this review provides insights into the current state-of-the-art techniques and prospects for utilizing vibrational spectroscopy in the authentication of edible oils, thereby facilitating quality control and consumer protection in the food industry.
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Affiliation(s)
- Banu Ozen
- Izmir Institute of Technology, Department of Food Engineering, Urla, Izmir, Turkiye.
| | - Cagri Cavdaroglu
- Izmir Institute of Technology, Department of Food Engineering, Urla, Izmir, Turkiye.
| | - Figen Tokatli
- Izmir Institute of Technology, Department of Food Engineering, Urla, Izmir, Turkiye.
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2
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Liu T, Zhang L, Pan L, Yang D. Polycyclic Aromatic Hydrocarbons' Impact on Crops and Occurrence, Sources, and Detection Methods in Food: A Review. Foods 2024; 13:1977. [PMID: 38998483 PMCID: PMC11240991 DOI: 10.3390/foods13131977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Revised: 06/20/2024] [Accepted: 06/20/2024] [Indexed: 07/14/2024] Open
Abstract
Polycyclic aromatic hydrocarbons (PAHs) represent a category of persistent organic pollutants that pose a global concern in the realm of food safety due to their recognized carcinogenic properties in humans. Food can be contaminated with PAHs that are present in water, air, or soil, or during food processing and cooking. The wide and varied sources of PAHs contribute to their persistent contamination of food, leading to their accumulation within these products. As a result, monitoring of the levels of PAHs in food is necessary to guarantee the safety of food products as well as the public health. This review paper attempts to give its readers an overview of the impact of PAHs on crops, their occurrence and sources, and the methodologies employed for the sample preparation and detection of PAHs in food. In addition, possible directions for future research are proposed. The objective is to provide references for the monitoring, prevention, and in-depth exploration of PAHs in food.
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Affiliation(s)
- Tengfei Liu
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
- Jiangsu Taihu Area Institute of Agricultural Sciences, Suzhou 215106, China
| | - Li Zhang
- Suzhou Vocational University Center for Food Safety and Nutrition, Suzhou 215104, China
| | - Leiqing Pan
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Daifeng Yang
- Jiangsu Taihu Area Institute of Agricultural Sciences, Suzhou 215106, China
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3
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Yu F, Qu C, Ding Z, Wang X, Zheng L, Su M, Liu H. Liquid Interfacial Coassembly of Plasmonic Arrays and Trace Hydrophobic Nanoplastics in Edible Oils for Robust Identification and Classification by Surface-Enhanced Raman Spectroscopy. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:14342-14350. [PMID: 37729664 DOI: 10.1021/acs.jafc.3c03860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
The ubiquity of micro-/nanoplastics poses a visible threat to the environment, aquatic organisms, and human beings and has become a global concern. Here, we proposed a liquid interface-based strategy using surface-enhanced Raman spectroscopy to coassemble nanoplastics and gold nanoparticles into a dense and homogeneous plasmonic array, thereby enabling the rapid and sensitive detection of trace nanoplastics. In addition, due to the uniqueness of the oil-water immiscible two-phase interface, we achieved ideal results for the detection of nanoplastics in a complex matrix (e.g., aqueous environment and edible oil) with a detection limit of μg/mL. With the aid of the principal component analysis algorithm, the differentiation and identification of multiple nanoplastic components (e.g., polystyrene, polyethylene, and polyethylene terephthalate) in aqueous environments and common hazards (e.g., Bap and Phe) in edible oil were achieved. Therefore, our self-assembled plasmonic arrays are expected to be used for monitoring environmental pollution and food safety.
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Affiliation(s)
- Fanfan Yu
- China Light Industry Key Laboratory of Meat Microbial Control and Utilization, School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei 230601, P. R. China
| | - Cheng Qu
- China Light Industry Key Laboratory of Meat Microbial Control and Utilization, School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei 230601, P. R. China
| | - Zhongxiang Ding
- China Light Industry Key Laboratory of Meat Microbial Control and Utilization, School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei 230601, P. R. China
| | - Xian Wang
- China Light Industry Key Laboratory of Meat Microbial Control and Utilization, School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei 230601, P. R. China
| | - Liqin Zheng
- China Light Industry Key Laboratory of Meat Microbial Control and Utilization, School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei 230601, P. R. China
| | - Mengke Su
- China Light Industry Key Laboratory of Meat Microbial Control and Utilization, School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei 230601, P. R. China
| | - Honglin Liu
- China Light Industry Key Laboratory of Meat Microbial Control and Utilization, School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei 230601, P. R. China
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4
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Kemsawasd V, Jayasena V, Karnpanit W. Incidents and Potential Adverse Health Effects of Serious Food Fraud Cases Originated in Asia. Foods 2023; 12:3522. [PMID: 37835175 PMCID: PMC10572764 DOI: 10.3390/foods12193522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 09/11/2023] [Accepted: 09/13/2023] [Indexed: 10/15/2023] Open
Abstract
Food fraud has long been regarded as a major issue within the food industry and is associated with serious economic and public health concerns. Economically motivated adulteration, the most common form of food fraud, has consequences for human health, ranging from mild to life-threatening conditions. Despite the potential harm and public health threats posed by food fraud, limited information on incidents causing illness has been reported. Enhancing the food control system on the Asian continent has become crucial for global health and trade considerations. Food fraud databases serve as valuable tools, assisting both the food industry and regulatory bodies in mitigating the vulnerabilities associated with fraudulent practices. However, the availability of accessible food fraud databases for Asian countries has been restricted. This review highlights detrimental food fraud cases originating in Asian countries, including sibutramine in dietary supplements, plasticizer contamination, gutter oil, and the adulteration of milk. This comprehensive analysis encompasses various facets, such as incident occurrences, adverse health effects, regulatory frameworks, and mitigation strategies.
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Affiliation(s)
- Varongsiri Kemsawasd
- Institute of Nutrition, Mahidol University, 999, Salaya, Phutthamonthon, Nakhon Pathom 73170, Thailand
| | - Vijay Jayasena
- School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia;
| | - Weeraya Karnpanit
- School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia;
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5
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Liu L, Peng M, Xu K, Xia H, Peng X, Peng L, Zhang JZ. Molecularly imprinted fluorescence assay based on lead halide perovskite quantum dots for determination of benzo(a)pyrene. Mikrochim Acta 2023; 190:380. [PMID: 37695413 DOI: 10.1007/s00604-023-05951-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 08/09/2023] [Indexed: 09/12/2023]
Abstract
Molecularly imprinted polymers with methylammonium lead halide perovskite quantum dots (MIP@MAPbBr3 PQDs) have been prepared and applied to the determination of benzo(a)pyrene (BaP) for the first time. The photoluminescence (PL) of MIP@MAPbBr3 PQDs was enhanced due to the surface passivation of defects by BaP. PL excitation and emission spectra, X-ray diffraction, Fourier transform infrared, and time-resolved PL studies suggest that the interaction between MIP@MAPbBr3 PQDs and BaP is a dynamic process. After MIP@MAPbBr3 PQDs were incubated with BaP, the benzene ring in the molecular structure of BaP can interact with MIP@MAPbBr3 PQDs through π electrons, which reduces non-radiative recombination of MIP@MAPbBr3 PQDs and lengthens excited state lifetime. The PL intensity of the MIP@MAPbBr3 PQDs-BaP system was monitored at 520 nm with 375 nm excitation. Under optimized conditions, the PL intensity of MIP@MAPbBr3 PQDs is linear with the concentration of BaP in the 10 to 100 ng·mL-1 range, with a detection limit of 1.6 ng·mL-1. The imprinting factor was 3.9, indicating excellent specificity of MIP@MAPbBr3 PQDs for BaP. The MIP@MAPbBr3 PQDs were subsequently applied to the PL analysis of BaP in sunflower seed oil, cured meat, and grilled fish samples, achieving recoveries from 79.3 to 107%, and relative standard deviations below 10%. This molecularly imprinted fluorescence assay improves the selectivity of BaP in complex mixtures and could be extended to other analytes.
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Affiliation(s)
- Li Liu
- Research Institute of Agricultural Quality Standards and Testing Technology, Hubei Academy of Agricultural Science, Wuhan, 430064, China
- Hubei Key Laboratory of Nutritional Quality and Safety of Agro-products, Wuhan, 430064, China
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, USA
| | - Maomin Peng
- Research Institute of Agricultural Quality Standards and Testing Technology, Hubei Academy of Agricultural Science, Wuhan, 430064, China
- Hubei Key Laboratory of Nutritional Quality and Safety of Agro-products, Wuhan, 430064, China
| | - Ke Xu
- Multiscale Crystal Materials Research Center, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China
| | - Hong Xia
- Research Institute of Agricultural Quality Standards and Testing Technology, Hubei Academy of Agricultural Science, Wuhan, 430064, China
- Hubei Key Laboratory of Nutritional Quality and Safety of Agro-products, Wuhan, 430064, China
| | - Xitian Peng
- Research Institute of Agricultural Quality Standards and Testing Technology, Hubei Academy of Agricultural Science, Wuhan, 430064, China.
- Hubei Key Laboratory of Nutritional Quality and Safety of Agro-products, Wuhan, 430064, China.
| | - Lijun Peng
- Research Institute of Agricultural Quality Standards and Testing Technology, Hubei Academy of Agricultural Science, Wuhan, 430064, China
- Hubei Key Laboratory of Nutritional Quality and Safety of Agro-products, Wuhan, 430064, China
| | - Jin Z Zhang
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, USA.
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Nagpal T, Yadav V, Khare SK, Siddhanta S, Sahu JK. Monitoring the lipid oxidation and fatty acid profile of oil using algorithm-assisted surface-enhanced Raman spectroscopy. Food Chem 2023; 428:136746. [PMID: 37421667 DOI: 10.1016/j.foodchem.2023.136746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 06/15/2023] [Accepted: 06/26/2023] [Indexed: 07/10/2023]
Abstract
Deep-fat frying of food develops lipid oxidation products that deteriorate oil and pose a health risk. This necessitates the development of a rapid and accurate oil quality and safety detection technique. Herein, surface-enhanced Raman spectroscopy (SERS) and sophisticated chemometric techniques were used for rapid and label-free determination of peroxide value (PV) and fatty acid composition of oil in-situ. In the study, plasmon-tuned and biocompatible Ag@Au core-shell nanoparticle-based SERS substrates were used to obtain optimum enhancement despite matrix interference to efficiently detect the oil components. The potent combination of SERS and the Artificial Neural Network (ANN) method could determine the fatty acid profile and PV with upto 99% accuracy. Moreover, the SERS-ANN method could quantify the low level of trans fats, i.e., < 2%, with 97% accuracy. Therefore, the developed algorithm-assisted SERS system enabled the sleek and rapid monitoring and on-site detection of oil oxidation.
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Affiliation(s)
- Tanya Nagpal
- Nanoscopic Imaging and Sensing Lab, Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110 016, India; Food Customization and Research Lab, Centre for Rural Development and Technology, Indian Institute of Technology Delhi, New Delhi 110 016, India; Enzyme and Microbial Biochemistry Lab, Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110 016, India
| | - Vikas Yadav
- Nanoscopic Imaging and Sensing Lab, Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110 016, India
| | - Sunil K Khare
- Enzyme and Microbial Biochemistry Lab, Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110 016, India
| | - Soumik Siddhanta
- Nanoscopic Imaging and Sensing Lab, Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110 016, India.
| | - Jatindra K Sahu
- Food Customization and Research Lab, Centre for Rural Development and Technology, Indian Institute of Technology Delhi, New Delhi 110 016, India.
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7
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Liu W, Sun S, Liu Y, Deng H, Hong F, Liu C, Zheng L. Determination of benzo(a)pyrene in peanut oil based on Raman spectroscopy and machine learning methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 299:122806. [PMID: 37167744 DOI: 10.1016/j.saa.2023.122806] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 04/26/2023] [Accepted: 04/27/2023] [Indexed: 05/13/2023]
Abstract
Benzo(a)pyrene (BaP) generated in the production process of oil is harmful to human severely as a kind of carcinogenic substance. In this study, the qualitative and quantitative detection of BaP concentration in peanut oil was investigated based on Raman spectroscopy combined with machine learning methods. The glass substrates and magnetron sputtered gold substrates for the Raman spectra were compared and the data preprocessing methods of principal component analysis (PCA) and t-distributed stochastic neighbor embedding (t-SNE) were used to process Raman signal. Back propagation neural network (BPNN), partial least squares regression (PLSR), support vector machine (SVM) and random forest (RF) algorithms were developed to obtain the qualitative and quantitative detection model of BaP concentration in peanut oil. The results showed that the Raman spectra with the glass substrate was more suitable for the BaP detection than magnetron sputtered gold substrates. RF combined with t-SNE could achieve an accuracy of 97.5% in the qualitative detection of BaP concentration levels in model validation experiment, and the correlation coefficient of the prediction set (Rp) in the quantitative detection was 0.9932, the root mean square error (RMSEP) was 0.8323 μg/kg and the bias was 0.1316 μg/kg. It can be concluded that Raman spectroscopy combined with machine learning methods could provide an effective method for the rapid determination of BaP concentration in peanut oil.
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Affiliation(s)
- Wei Liu
- Intelligent Control and Compute Vision Lab, Hefei University, Hefei 230601, China
| | - Shengai Sun
- Intelligent Control and Compute Vision Lab, Hefei University, Hefei 230601, China
| | - Yang Liu
- Intelligent Control and Compute Vision Lab, Hefei University, Hefei 230601, China
| | - Haiyang Deng
- Intelligent Control and Compute Vision Lab, Hefei University, Hefei 230601, China
| | - Fei Hong
- Intelligent Control and Compute Vision Lab, Hefei University, Hefei 230601, China
| | - Changhong Liu
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230009, China.
| | - Lei Zheng
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230009, China; Research Laboratory of Agricultural Environment and Food Safety, Anhui Modern Agricultural Industry Technology System, Hefei 230009, China.
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8
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Qiu M, Zheng S, Li P, Tang L, Xu Q, Weng S. Detection of 1-OHPyr in human urine using SERS with injection under wet liquid-liquid self-assembled films of β-CD-coated gold nanoparticles and deep learning. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 290:122238. [PMID: 36592595 DOI: 10.1016/j.saa.2022.122238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 12/06/2022] [Accepted: 12/10/2022] [Indexed: 06/17/2023]
Abstract
1-Hydroxypyrene (1-OHPyr), a typical hydroxylated polycyclic aromatic hydrocarbon (OH-PAH), has been commonly regarded as a urinary biomarker for assessing human exposure and health risks of PAHs. Herein, a fast and sensitive method was developed for the determination of 1-OHPyr in urine using surface-enhanced Raman spectroscopy (SERS) combined with deep learning (DL). After emulsification, urinary 1-OHPyr was separated using simple liquid-liquid extraction. Gold nanoparticles with β-cyclodextrin (β-CD@AuNPs) were synthesized, and homogeneous and ordered β-CD@AuNP films were prepared through a liquid-liquid interface self-assembly process. The separated 1-OHPyr was injected under wet assembled films for SERS detection. Concentration as low as 0.05 μg mL-1 of 1-OHPyr in urine could still be detected, and the relative standard deviation was 5.5 %, and this was ascribed to the adsorption of β-CD and the high-probability contact between 1-OHPyr molecules and the nanogap of assembled films under the action of capillary force. Meanwhile, a convolutional neural network (CNN), a classical DL network architecture, was adopted to build the prediction model, and the model was further simplified by genetic algorithm (GA). CNN combined with a GA obtained optimized results with determination coefficient and a root mean square error of prediction sets of 0.9639 and 0.6327, respectively, outperforming other models. Overall, the proposed method achieves fast and accurate detection of 1-OHPyr in urine, improves the assessment human exposure to PAHs and is expected to have applications in the analysis of other OH-PAHs in complex environments.
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Affiliation(s)
- Mengqing Qiu
- Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China; University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Shouguo Zheng
- Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China; Lu'an Branch, Anhui Institute of Innovation for Industrial Technology, Lu'an 237100, People's Republic of China
| | - Pan Li
- Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
| | - Le Tang
- National Engineering Research Center for Agro-Ecological Big Data Analysis & Application, Anhui University, Hefei 230601, People's Republic of China
| | - Qingshan Xu
- Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
| | - Shizhuang Weng
- Lu'an Branch, Anhui Institute of Innovation for Industrial Technology, Lu'an 237100, People's Republic of China; National Engineering Research Center for Agro-Ecological Big Data Analysis & Application, Anhui University, Hefei 230601, People's Republic of China.
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Zhang Y, Ye Z, Li C, Chen Q, Aljuhani W, Huang Y, Xu X, Wu C, Bell SEJ, Xu Y. General approach to surface-accessible plasmonic Pickering emulsions for SERS sensing and interfacial catalysis. Nat Commun 2023; 14:1392. [PMID: 36914627 PMCID: PMC10011407 DOI: 10.1038/s41467-023-37001-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 02/24/2023] [Indexed: 03/16/2023] Open
Abstract
Pickering emulsions represent an important class of functional materials with potential applications in sustainability and healthcare. Currently, the synthesis of Pickering emulsions relies heavily on the use of strongly adsorbing molecular modifiers to tune the surface chemistry of the nanoparticle constituents. This approach is inconvenient and potentially a dead-end for many applications since the adsorbed modifiers prevent interactions between the functional nanosurface and its surroundings. Here, we demonstrate a general modifier-free approach to construct Pickering emulsions by using a combination of stabilizer particles, which stabilize the emulsion droplet, and a second population of unmodified functional particles that sit alongside the stabilizers at the interface. Freeing Pickering emulsions from chemical modifiers unlocks their potential across a range of applications including plasmonic sensing and interfacial catalysis that have previously been challenging to achieve. More broadly, this strategy provides an approach to the development of surface-accessible nanomaterials with enhanced and/or additional properties from a wide range of nano-building blocks including organic nanocrystals, carbonaceous materials, metals and oxides.
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Affiliation(s)
- Yingrui Zhang
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK
| | - Ziwei Ye
- Key Laboratory for Advanced Materials, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, PR China
| | - Chunchun Li
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK
| | - Qinglu Chen
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK
| | - Wafaa Aljuhani
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK
| | - Yiming Huang
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK
| | - Xin Xu
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, MOE Key Laboratory of Computational Physical Sciences, Department of Chemistry, Fudan University, Shanghai, 200433, PR China
| | - Chunfei Wu
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK
| | - Steven E J Bell
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK
| | - Yikai Xu
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK.
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10
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Song X, Sheng H, Zhou Y, Yu Y, He Y, Wang Z. Construction, expression, purification, characterization, and structural analysis of microbial transglutaminase variants. Biotechnol Appl Biochem 2022; 69:2486-2495. [PMID: 34894362 DOI: 10.1002/bab.2298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Accepted: 11/30/2021] [Indexed: 12/27/2022]
Abstract
Microbial transglutaminase (MTG, EC 2.3.2.13) derived from Streptomyces mobaraensis is widely used in the food and pharmaceutical industry because of its ability to synthesize isopeptide bonds between the proteinogenic side chains of glutamine and lysine. The half-life (t1/2 ) of the activated wild-type enzyme at 60°C is 2 min. To improve the activity and thermostability of MTG for higher temperature application, three variants (Mut1, Mut2, and Mut3) were obtained by combining key amino acid mutations on the basis of previous research results. The best variant Mut2 with a specific combination of five of seven substitutions (S2P-S23V-Y24N-R215A-H289Y) shows a 10-fold increased half-life at 60°C (t1/2 = 27.6 min), and a 2.4-fold increased specific enzyme activity (39.3 U/mg). As measured by circular dichroism, the curve of Mut2 was basically the same as that of MTG-WT. The structural simulation of Mut2 shows that the overall structure is discoid with a crack, but the crack openings are wider than that of MTG-WT. Furthermore, structural analysis of Mut2 showed that there were seven hydrogen bonds and one π-anion interaction between Mut2 and its adjacent amino acids, and the number of hydrogen bonds was one more than that of MTG-WT (six hydrogen bonds).
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Affiliation(s)
- Xiaoping Song
- Department of Pharmacy, Anhui Medical College, Hefei, China.,Anhui Engineering Research Center of Recombinant Protein Pharmaceutical Biotechnology, School of Life Science, University of Science and Technology of China, Hefei, China
| | - Hefang Sheng
- Department of Pharmacy, Anhui Medical College, Hefei, China
| | - Yueqiao Zhou
- Department of Pharmacy, Anhui Medical College, Hefei, China
| | - Yin Yu
- Department of Pharmacy, Anhui Medical College, Hefei, China.,Anhui Engineering Research Center of Recombinant Protein Pharmaceutical Biotechnology, School of Life Science, University of Science and Technology of China, Hefei, China
| | - Yingjiao He
- Department of Pharmacy, Anhui Medical College, Hefei, China
| | - Zihan Wang
- Department of Pharmacy, Anhui Medical College, Hefei, China.,Anhui Engineering Research Center of Recombinant Protein Pharmaceutical Biotechnology, School of Life Science, University of Science and Technology of China, Hefei, China
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11
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Raman Spectroscopy for Food Quality Assurance and Safety Monitoring: A Review. Curr Opin Food Sci 2022. [DOI: 10.1016/j.cofs.2022.100910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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12
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Li C, Chen Z, Huang Y, Zhang Y, Li X, Ye Z, Xu X, Bell SE, Xu Y. Uncovering strong π-metal interactions on Ag and Au nanosurfaces under ambient conditions via in-situ surface-enhanced Raman spectroscopy. Chem 2022. [DOI: 10.1016/j.chempr.2022.06.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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13
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Cao X, Li X, Shu N, Tan CP, Xu YJ, Liu Y. The Characteristics and Analysis of Polar Compounds in Deep-Frying Oil: a Mini Review. FOOD ANAL METHOD 2022. [DOI: 10.1007/s12161-022-02335-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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14
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Sha P, Su Q, Dong P, Wang T, Zhu C, Gao W, Wu X. Fabrication of Ag@Au (core@shell) nanorods as a SERS substrate by the oblique angle deposition process and sputtering technology. RSC Adv 2021; 11:27107-27114. [PMID: 35480685 PMCID: PMC9037617 DOI: 10.1039/d1ra04709d] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 07/30/2021] [Indexed: 12/17/2022] Open
Abstract
Gold (Au) and silver (Ag) are the main materials exhibiting strong Surface-Enhanced Raman Scattering (SERS) effects. The Ag nano-rods (AgNRs) and Au nano-rods (AuNRs) SERS substrates prepared using the technology of the oblique angle deposition (OAD) process have received considerable attention in recent years because of their rapid preparation process and good repeatability. However, AgNR substrates are unstable due to the low chemical stability of Ag. To overcome these limitations, an Ag@Au core-shell nano-rod (NR) array SERS substrate was fabricated using the OAD process and sputtering technology. Moreover, simulation analysis was performed using finite-difference time-domain calculations to evaluate the enhancement mechanism of the Ag@Au NR array substrate. Based on the simulation results and actual process conditions, the Ag@Au core-shell NR array substrate with the Au shell thickness of 20 nm was studied. To characterize the substrate's SERS performance, 1,2-bis(4-pyridyl)ethylene (BPE) was used as the Raman probe. The limit of detection of BPE could reach 10-12 M. The Ag@Au NR array substrate demonstrated uniformity with an acceptable relative standard deviation. Despite the strong oxidation of the hydrogen peroxide (H2O2) solution, the Ag@Au NR array substrate maintains good chemical stability and SERS performance. And long-term stability of the Ag@Au NR substrate was observed over 8 months of storage time. Our results show the successful preparation of a highly sensitive, repeatable and stable substrate. Furthermore, this substrate proves great potential in the field of biochemical sensing.
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Affiliation(s)
- Pengxing Sha
- College of Intelligence Science and Technology, National University of Defense Technology Changsha 410073 People's Republic of China
| | - Qingqing Su
- College of Intelligence Science and Technology, National University of Defense Technology Changsha 410073 People's Republic of China
| | - Peitao Dong
- College of Intelligence Science and Technology, National University of Defense Technology Changsha 410073 People's Republic of China
| | - Tianran Wang
- College of Intelligence Science and Technology, National University of Defense Technology Changsha 410073 People's Republic of China
| | - Chushu Zhu
- College of Intelligence Science and Technology, National University of Defense Technology Changsha 410073 People's Republic of China
| | - Weiye Gao
- College of Intelligence Science and Technology, National University of Defense Technology Changsha 410073 People's Republic of China
| | - Xuezhong Wu
- College of Intelligence Science and Technology, National University of Defense Technology Changsha 410073 People's Republic of China
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