Antibody-conjugated nanoparticles are used in a fields ranging from medicine to engineering. NanoAct® nanobeads are cellulose nanoparticles used in lateral flow assays that are highly water dispersible. In order to promote the adsorption of antibodies onto NanoAct® particles while maintaining their activity, we analyzed the adsorption onto NanoAct® particles thermodynamically and elucidated the adsorption mechanism. In an immunochromatographic assay, the amount of adsorbed antibody and the color intensity of the test line increased as the pH decreased. The zeta potential of the nanoparticles remained constant at around -30 mV over the pH range from 2 to 10. The model antibody had pI values between 6.2 and 6.8. Isothermal calorimetry analysis showed that adsorption of antibody to the NanoAct® particle is an endothermic reaction under low pH conditions, an exothermic reaction between pH 6 and pH 7, and a weakly exothermic reaction above pH 7. These data indicate that the changes in net charge of the antibody surface as a function of pH influence the pH dependence of antibody adsorption to the negatively charged NanoAct®. This suggests that increased positive charge on the antibody surface will result in a more sensitive NanoAct®-based immunoassay.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ab.2021.114337 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Prevalence of "weak B" phenotypes and their evaluation and differentiation in healthy blood donor population in Eastern India.
Asian J Transfus Sci
November 2023
Department of Transfusion Medicine, Apollo Multispeciality Hospitals, Kolkata, West Bengal, India.
Background: Examples of group B red cells that react weakly or not at all with anti-B have been described. Subgroups of B such as B, B, B, and B are rare and are less frequently reported. We studied the frequency of subgroups of B in our healthy blood donor population and serologically characterized and differentiated these subgroups.
View Article and Find Full Text PDFPhage-ELISA for ultrasensitive detection of .
Analyst
January 2025
College of Veterinary Medicine, Institute of Comparative Medicine, Yangzhou University, Yangzhou 225009, China.
The M13 phage carries approximately 5 copies of the pIII protein, each of which is capable of displaying a single-chain variable fragment (scFv) that targets a specific antigen. This feature enables the M13 phage to be widely employed in the construction of scFv libraries, thereby facilitating the identification of antibodies with high specificity and affinity for target antigens. In this study, mice were immunized three times with (strain C50041) to induce diverse antibodies.
View Article and Find Full Text PDFSequential pH/GSH-responsive stealth nanoparticles for co-delivery of anti-PD-1 antibody and paclitaxel to enhance chemoimmunotherapy of lung cancer.
Eur J Med Chem
January 2025
Innovation Research Institute of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China. Electronic address:
Intravenously administered nanoparticles (NPs) often bind with plasma proteins, forming the protein corona that promotes rapid systemic clearance, a primary challenge in nanomedicine. In this study, we developed a pH- and GSH-sensitive "stealth" nanodelivery system, PTX@NPs-aPD1-IL, for sequential drug release. By using a biocompatible choline-based ionic liquid (IL) as the coating for NPs, the interaction and adsorption of NPs with serum proteins were reduced, achieving targeted delivery to the lung organ and increasing drug accumulation.
View Article and Find Full Text PDFCuSe@BiMoO nanozyme-based immunoassay for the colorimetric detection of walnut allergen in foods.
Food Chem
January 2025
State Key Laboratory for Food Nutrition and Safety; College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China. Electronic address:
In the present study, we developed a nanozyme-based direct competitive immunoassay to detect walnut allergen (Jug r 4) in foods. Walnut monoclonal antibody (mAb) and CuSe@BiMoO nanocomposites were generated to form a signal probe by electrostatic adsorption. The nanocomposites had high peroxidase-like activity and could be stored at room temperature.
View Article and Find Full Text PDFUltrasensitive and high selectivity detection of fibrin using Y-shaped DNA-homing peptide doped probe on localized surface plasmon resonance platform.
Anal Chim Acta
January 2025
Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252000, China.
Background: Localized surface plasmon resonance (LSPR) sensor has drawn continuous attention to application of the detection of antibody, protein, virus, and bacteria. However, natural recognition molecules, such as antibody, which possess some properties, including low thermal stability, complicated operation and high price, uncontrollability of length and size and a tendency to accumulate easily on the surface of chip to reduce the sensitive of method. Furthermore, common blocking agents are not suitable for development of novel biosensors.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!