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Yin P, Wang J, Li T, Pan Q, Zhu L, Yu F, Zhao YZ, Liu HB. A smartphone-based fluorescent sensor for rapid detection of multiple pathogenic bacteria. Biosens Bioelectron 2023; 242:115744. [PMID: 37826879 DOI: 10.1016/j.bios.2023.115744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 08/16/2023] [Accepted: 10/06/2023] [Indexed: 10/14/2023]
Abstract
In this study, we developed a fluorescent sensor for the sensitive detection of multiple pathogenic bacteria based on magnetic separation, fluorescent probes, and smartphone image processing. A microchannel device was assembled using high-transparency resin and 3D printing technology. This device was combined with a smartphone and an external lens to develop a fluorescent sensor for autonomous detection of multiple pathogenic bacteria. Three fluorescence probes with different fluorescence were synthesized from highly specific aptamers and tetraphenylethylene derivatives. These fluorescent probes can make Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa emit different colors of fluorescence. Using the enrichment performance of molecularly imprinted materials, separation and detection of bacteria can be achieved simultaneously. Finally, with the Red-Green-Blue (RGB) analysis functionality of a smartphone, real-time field detection was realized with a sensitivity of 102 CFU/mL and a detection time of 40 min. This work provides a simple, inexpensive, and real-time sensor for the detection of multiple pathogens in medical diagnostics, food testing, and environmental analyses.
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Affiliation(s)
- Pengchao Yin
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Jing Wang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Ting Li
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Qingbin Pan
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Linchen Zhu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Feifei Yu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Yong-Zhen Zhao
- Guangxi Shrimp Breeding Engineering Technology Research Center, Guangxi Academy of Fisheries Sciences, Nanning, China
| | - Hai-Bo Liu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China.
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Dai J, Chen C, Yin M, Li H, Li W, Zhang Z, Wang Q, Du Z, Xu X, Wang Y. Interactions between gold nanoparticles with different morphologies and human serum albumin. Front Chem 2023; 11:1273388. [PMID: 37927561 PMCID: PMC10620604 DOI: 10.3389/fchem.2023.1273388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 10/05/2023] [Indexed: 11/07/2023] Open
Abstract
Introduction: Three different shapes of gold nanoparticles were synthesized in this experiment. At the same time, studies compared their effects with human serum albumin (HSA). Methods: Gold nanoparticles (AuNPs) with three different morphologies, such as, nanospheres (AuNSs), nanorods (AuNRs), and nanoflowers (AuNFs) were synthesized via a seeding method and their characteristic absorption peaks were detected using ultraviolet-visible (UV-vis) absorption spectroscopy, Telectron microscopy (TEM), Dynamic Light Scattering (DLS) and Zeta potential measurements, circular dichroism (CD), and Fourier transform infrared spectroscopy (FTIR) to study the interactions between them and HSA. By comparing the thermodynamic parameters and quenching mechanism of the three materials, similarities and differences were determined in their interactions with HSA. Results: The results showed that with an increase in the concentration of the AuNPs with the three different morphologies, the UV-vis absorption peak intensity of the mixed solution increased, but its fluorescence intensity was quenched. This indicates that the three types of AuNPs interact with HSA, and that the interactions between them represent a static quenching process, which is consistent with the conclusions derived from three-dimensional fluorescence experiments. Through variable-temperature fluorescence experiments, the binding constants, number of binding sites, and thermodynamic parameters of the interactions between the three types of AuNPs and HSA were determined. The Gibbs free energy changes were <0, indicating that the reactions of the three types of AuNPs with HSA are spontaneous, resulting in associated matter. Binding constant measurements indicated that the strongest binding took place between the AuNFs and HSA. In addition, the results of fluorescence, CD spectroscopy, and FTIR showed that three different shapes of AuNPs can induce conformational changes in HSA and reduce the α-helix content. Among them, AuNFs have the smallest ability to induce conformational changes. Discussion: According to studies, AuNFs interact more favorably with HSA. This can be used as a reference for the administration of drugs containing AuNPs.
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Affiliation(s)
- Jiahui Dai
- Clinical Medical College, Jining Medical University, Jining, Shandong, China
| | - Chao Chen
- Clinical Medical College, Jining Medical University, Jining, Shandong, China
| | - Man Yin
- Clinical Medical College, Jining Medical University, Jining, Shandong, China
| | - Huixing Li
- Program for Scientific Research Innovation Team in Precision Medicine of Gynecologic Oncology, Affiliated Hospital of Jining Medical University, Jining, Shandong, China
| | - Wenbo Li
- Laboratory of New Antitumor Drug Molecular Design and Synthesis, College of Basic Medical, Jining Medical University, Jining, Shandong, China
| | - Zhaowei Zhang
- Laboratory of New Antitumor Drug Molecular Design and Synthesis, College of Basic Medical, Jining Medical University, Jining, Shandong, China
| | - Qian Wang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Zhongyu Du
- Laboratory of New Antitumor Drug Molecular Design and Synthesis, College of Basic Medical, Jining Medical University, Jining, Shandong, China
| | - Xiangyu Xu
- Laboratory of New Antitumor Drug Molecular Design and Synthesis, College of Basic Medical, Jining Medical University, Jining, Shandong, China
| | - Yunfei Wang
- Program for Scientific Research Innovation Team in Precision Medicine of Gynecologic Oncology, Affiliated Hospital of Jining Medical University, Jining, Shandong, China
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Toader GA, Nitu FR, Ionita M. Graphene Oxide/Nitrocellulose Non-Covalent Hybrid as Solid Phase for Oligo-DNA Extraction from Complex Medium. Molecules 2023; 28:4599. [PMID: 37375154 DOI: 10.3390/molecules28124599] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 05/31/2023] [Accepted: 06/03/2023] [Indexed: 06/29/2023] Open
Abstract
A nitrocellulose-graphene oxide hybrid that consists of a commercially nitrocellulose (NC) membrane non-covalently modified with graphene oxide (GO) microparticles was successfully prepared for oligonucleotide extraction. The modification of NC membrane was confirmed by Fourier Transform Infrared Spectroscopy (FTIR), which highlighted the principal absorption bands of both the NC membrane at 1641, 1276, and 835 cm-1 (NO2) and of GO in the range of 3450 cm-1 (CH2-OH). The SEM analysis underlined the well-dispersed and uniform coverage of NC membrane with GO, which displayed thin spider web morphology. The wettability assay indicated that the NC-GO hybrid membrane exhibited slightly lower hydrophilic behavior, with a water contact angle of 26.7°, compared to the 15° contact angle of the NC control membrane. The NC-GO hybrid membranes were used to separate oligonucleotides that had fewer than 50 nucleotides (nt) from complex solutions. The features of the NC-GO hybrid membranes were tested for extraction periods of 30, 45, and 60 min in three different complex solutions, i.e., an aqueous medium, an α-Minimum Essential Medium (αMEM), and an αMEM supplemented with fetal bovine serum (FBS). The oligonucleotides were desorbed from the surface of the NC-GO hybrid membrane using Tris-HCl buffer with a pH of 8.0. Out of the three media utilized, the best results were achieved after 60 min incubation of the NC-GO membranes in αMEM, as evidenced by the highest fluorescence emission of 294 relative fluorescence units (r.f.u.). This value corresponded to the extraction of approximately 330-370 pg (≈7%) of the total oligo-DNA. This method is an efficient and effortless way to purify short oligonucleotides from complex solutions.
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Affiliation(s)
- Georgian A Toader
- Faculty of Medical Engineering, University Politehnica of Bucharest, Gh Polizu 1-7, 011061 Bucharest, Romania
| | - Florentin R Nitu
- Faculty of Medical Engineering, University Politehnica of Bucharest, Gh Polizu 1-7, 011061 Bucharest, Romania
- Genetic Lab, Str. Milcov, nr. 5, Sector 1, 012273 Bucuresti, Romania
| | - Mariana Ionita
- Faculty of Medical Engineering, University Politehnica of Bucharest, Gh Polizu 1-7, 011061 Bucharest, Romania
- Advanced Polymer Materials Group, University Politehnica of Bucharest, Gheorghe Polizu 1-7, 011061 Bucharest, Romania
- eBio-Hub Research Centre, University Politehnica of Bucharest-Campus, Iuliu Maniu 6, 061344 Bucharest, Romania
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