New application of bimetallic Ag/Pt nanoplates in a colorimetric biosensor for specific detection of E. coli in water

• Azam Bagheri Pebdeni,
• Mohammad N. AL-Baiati and
• Morteza Hosseini

Beilstein J. Nanotechnol. 2024, 15, 95–103, doi:10.3762/bjnano.15.9

• detection is described using a silver/platinum nanoplate (Ag/Pt NPL) that interacts with an oligonucleotide aptamer as a bioreceptor. The size of the Ag/Pt NPLs was about 42 nm according to the FE-SEM images. The EDS result indicates that a thin layer of Pt ions was coated on the surface of the Ag NPLs

• %. The developed assay should serve as a general platform for detecting other pathogenic bacteria which affect water and food quality. The proposed E. coli detection strategy has appealing characteristics such as high sensitivity, simple operation, short testing time, and low cost. Keywords: aptamer

• nanobiosensor as well as a paper-based analytical equipment for detecting E. coli. The E. coli could be trapped by the aptamer-NPL to create bacteria–aptamers–Ag/Pt NPL complexes in which the aptamers effectively change on the surface of Ag/Pt NPL. Surprisingly, in the conventional TMB and H2O2 color reaction

Nanotechnology – a robust tool for fighting the challenges of drug resistance in non-small cell lung cancer

• Filip Gorachinov,
• Fatima Mraiche,
• Diala Alhaj Moustafa,
• Ola Hishari,
• Yomna Ismail,
• Jensa Joseph,
• Maja Simonoska Crcarevska,
• Marija Glavas Dodov,
• Nikola Geskovski and
• Katerina Goracinova

Beilstein J. Nanotechnol. 2023, 14, 240–261, doi:10.3762/bjnano.14.23

• tumor inhibition was achieved [115]. Lv et al. prepared multifunctional dendrimer nanoscale complexes composed of anti-EGFR aptamer-modified poly(amidoamine) (PAMAM) loaded with erlotinib and chloroquine (CQ) for NSCLC treatment. These cationic nanoparticles showed high condensation capacity for

• survivin-small hairpin RNA (survivin-shRNA), which was trapped by electrostatic interactions in the cavity between several assembled nanoparticles (AP/ES+CQ NPs; AP = amine-terminated PAMAM dendrimers modified with anti-EGFR aptamer; ES = erlotinib and survivin-shRNA; Figure 2, Figure 3). The nanocomplexes

Cyclodextrins as eminent constituents in nanoarchitectonics for drug delivery systems

• Makoto Komiyama

Beilstein J. Nanotechnol. 2023, 14, 218–232, doi:10.3762/bjnano.14.21

• so that it binds to the linker DNA through RNA/DNA duplex formation. Two kinds of β-CyD bearing DNAs (Apt-7F and HA-7R) and the sgRNA/Cas9 composite were co-assembled to nanoparticles of 120 nm diameter (dark yellow). The composite was further modified with an aptamer (for targeting to tumors) and an

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

• Abu Hashem,
• M. A. Motalib Hossain,
• Ab Rahman Marlinda,
• Mohammad Al Mamun,
• Khanom Simarani and
• Mohd Rafie Johan

Beilstein J. Nanotechnol. 2022, 13, 1458–1472, doi:10.3762/bjnano.13.120

• peptide nucleic acid (PNA) probes [64]. Methylene blue is a very prominent intercalator for DNA-based sensors and biosensors [31][65][66][67][68][69]. For example, Plaxco's group reported the preparation of electrode-immobilised methylene-blue-modified oligonucleotides for electrochemical DNA and aptamer

Studies of probe tip materials by atomic force microscopy: a review

• Ke Xu and
• Yuzhe Liu

Beilstein J. Nanotechnol. 2022, 13, 1256–1267, doi:10.3762/bjnano.13.104

• antibody molecule. Therefore, subsequent research is needed to improve the stability and enhance the ease of use of the colloidal gold probe. To improve the stability and sensitivity of this type of probe, Miao et al. [53] proposed a homogeneous and "non-"fluorescent aptamer detection method for

• -cdse/ZnS quantum dots. This type of tracer has a significant signal amplification effect. Vesicle composite probes were generated using aptamer-labeled SSB/L-QD and nanogold (Au-Apt). Since Au-aptas receptors burst the signal of SSB/L-QD, this type of probe cannot fluoresce "off". To solve this problem

• , the CAP is added to the complex probe solution, and the aptamer is released after binding to the CAP, which can change the "off" state to the "on" state in the tracer. The experimental results show a good linear response to CAP with a detection limit of 0.3 pM starting from 0.001 nM. 88 nm size

DNA aptamer selection and construction of an aptasensor based on graphene FETs for Zika virus NS1 protein detection

• Nathalie B. F. Almeida,
• Thiago A. S. L. Sousa,
• Viviane C. F. Santos,
• Camila M. S. Lacerda,
• Thais G. Silva,
• Rafaella F. Q. Grenfell,
• Flavio Plentz and
• Antero S. R. Andrade

Beilstein J. Nanotechnol. 2022, 13, 873–881, doi:10.3762/bjnano.13.78

• ligands by exponential enrichment” (SELEX). In this study, we select an aptamer (termed ZIKV60) by capillary electrophoresis SELEX (CE-SELEX) to the Zika virus non-structural protein 1 (NS1) and counterselection against the NS1 proteins of DENV (serotypes 1, 2, 3, and 4) and YFV. The ZIKV60 dissociation

• constant (Kd) is determined by enzyme-linked oligonucleotide assay (ELONA) and the aptamer specificity is evaluated by quantitative real-time polymerase chain reaction. ZIKV60 shows a high binding affinity to the ZIKV NS1 protein with a Kd value of 2.28 ± 0.28 nM. The aptamer presents high specificity for

• ZIKV NS1 compared to NS1 of DENV and YFV. Furthermore, graphene field-effect transistor devices functionalized with ZIKV60 exhibit an evident identification of NS1 protein diluted in human serum. These results point to the applicability of biosensors based on the ZIKV60 aptamer for the differential

Comprehensive review on ultrasound-responsive theranostic nanomaterials: mechanisms, structures and medical applications

• Sepand Tehrani Fateh,
• Lida Moradi,
• Elmira Kohan,
• Michael R. Hamblin and
• Amin Shiralizadeh Dezfuli

Beilstein J. Nanotechnol. 2021, 12, 808–862, doi:10.3762/bjnano.12.64

The impact of molecular tumor profiling on the design strategies for targeting myeloid leukemia and EGFR/CD44-positive solid tumors

• Nikola Geskovski,
• Nadica Matevska-Geshkovska,
• Simona Dimchevska Sazdovska,
• Marija Glavas Dodov,
• Kristina Mladenovska and
• Katerina Goracinova

Beilstein J. Nanotechnol. 2021, 12, 375–401, doi:10.3762/bjnano.12.31

• (Figure 2). The aptamer DNA–cyclodextrin (CD) component of the polyrotaxan complex demonstrates a high degree of sliding freedom. This unique ability allows for a more efficient binding of the aptamer DNA to target molecules on cancer cells. It simultaneously allows other ligands on the same carrier to

Highly sensitive detection of estradiol by a SERS sensor based on TiO₂ covered with gold nanoparticles

• Andrea Brognara,
• Ili F. Mohamad Ali Nasri,
• Beatrice R. Bricchi,
• Andrea Li Bassi,
• Caroline Gauchotte-Lindsay,
• Matteo Ghidelli and
• Nathalie Lidgi-Guigui

Beilstein J. Nanotechnol. 2020, 11, 1026–1035, doi:10.3762/bjnano.11.87

• -estradiol, an emerging contaminant in environmental waters. We have found a limit of detection of 1 nM with a sensitivity allowing for a dynamic range of five orders of magnitude (up to 100 µM). Keywords: aptamer; Au nanoparticles; 17-β estradiol (E2); plasmonics; sensor; surface-enhanced Raman scattering

• aptamers is that their Raman fingerprint is easily recognizable, as DNA is an extensively studied molecule. In this study, we focus on the detection of E2 with an aptamer-functionalized sensor. E2 is the main female hormone responsible for growth, reproduction, breast development, maturation, bone

• was measured with ImageJ® in order to calculate the equivalent diameter, which was used to define the NP size. Chemicals and reagents Mercaptobenzoic acid (MBA), 6-mercapto-1-hexanol (MCH), 17β-estradiol (E2), and ethanol were purchased from Sigma-Aldrich. A 17β-estradiol binding aptamer was

Molecular architectonics of DNA for functional nanoarchitectures

• Debasis Ghosh,
• Lakshmi P. Datta and
• Thimmaiah Govindaraju

Beilstein J. Nanotechnol. 2020, 11, 124–140, doi:10.3762/bjnano.11.11

• construction of a DNA origami-based nanorobot for the cargo delivery of payloads into cancer cells [56]. The autonomous DNA nanorobot was constructed using a nucleolin-binding DNA aptamer and was loaded with thrombin protease. The nucleolin protein was overexpressed in tumor-associated endothelial cells, which

• the edges can be covalently modified with several active functionalities or biomolecules. The groups of Shangguan and Tan reported on the biofunctionalization of metal nanoparticles using aptamer-appended DNA tetrahedron nanostructures [68]. The aptamer-appended tetrahedron structures were constructed

• using three 55 nucleotide-long carboxylic acid-linked DNA strands and a tumor-targeting 87 nucleotide-long aptamer. The carboxylic acid groups of the DNA tetrahedron facilitated the interaction with oleic acid-coated iron oxide nanoparticles via a ligand exchange reaction. The aptamer–DNA tetrahedron

Targeting strategies for improving the efficacy of nanomedicine in oncology

• Gonzalo Villaverde and
• Alejandro Baeza

Beilstein J. Nanotechnol. 2019, 10, 168–181, doi:10.3762/bjnano.10.16

• purposes are aptamers. Aptamers are oligonucleotide chains that exhibit a characteristic three-dimensional structure capable to bind to specific membrane cell receptors overproduced by the tumoral cells. The aptamer that specifically binds to a certain protein is usually selected by the technique named

• vacuolating virus 40 (SV40), GRKKRRQRRRPQ in the TAT peptide present in human immunodeficiency virus (HIV), or KRPAATKKAGQAKKKKL in the case of nucleoplasmin [45]. These peptides have been anchored on the surface of different nanocarriers providing excellent results [46]. The aptamer AS1411 selective for

Comparison of the interactions of daunorubicin in a free form and attached to single-walled carbon nanotubes with model lipid membranes

• Dorota Matyszewska

Beilstein J. Nanotechnol. 2016, 7, 524–532, doi:10.3762/bjnano.7.46

• fields. Such magnetic nanoparticles conjugated with DNR were reported to induce apoptosis of cancer cell lines [11][12]. Other examples of nanoparticles include titanium dioxide (TiO2) and gold nanoparticles (AuNPs) [13][14]. In the latter case the nanoparticles were also modified with aptamer – single

• conjugated to either polyethylene glycol (PEG) functionalized single-walled carbon nanotubes (SWCNTs) [20] or to aptamer-wrapped SWCNTs via π–π interactions. In both cases the cytotoxicity of the conjugates was verified on the selected cancer cell lines. In this study the influence of both free daunorubicin

Silica micro/nanospheres for theranostics: from bimodal MRI and fluorescent imaging probes to cancer therapy

• Shanka Walia and
• Amitabha Acharya

Beilstein J. Nanotechnol. 2015, 6, 546–558, doi:10.3762/bjnano.6.57

• silica-encapsulated hydrophobic Mn3O4 NPs in which the silica surface was further modified by fluorescent rhodamine B and aptamer (AS411) as a targeting ligand. The in vitro confocal imaging and in vivo MRI studies showed that NPs specifically targeted the cancer cells. The histopathological and