Background: Dynamic light scattering (DLS) and electron microscopy (EM) are the most practical techniques for nanoparticles (NPs) characterization. However, the impediments which involved the sample preparation method lead to failure in provided results of mentioned device analysis. These problems will be intensifying, if the examined samples are the soft nanocarriers such as organic ones or biological samples.
Objectives: In order to achieve the appropriate results from DLS and EM analysis, an optimized protocol was introduced by this research which would prepare samples with high degree of quality and accuracy.
Materials And Methods: Morphological analysis of prepared polymeric nanocarriers (micelles, nanogels) by this protocol were done. Filtration, dilution and sonication as three crucial and effectiveness steps of sample preparation were assessed through DLS data and EM images.
Results: This research has tried to introduce a facile method with novelty of simplicity and rapidity. These triple steps could improve the quality of morphological data. The obtained results indicated that sample preparation methods have the most effective factors on sample size distribution and homogeneity of desired samples.
Conclusion: The suggested optimized preparation method will be helpful for all soft nanomaterial's samples.
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http://dx.doi.org/10.30498/IJB.2020.2645 | DOI Listing |
Microscopy (Oxf)
December 2024
Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-star), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan.
It is challenging to image structures in liquids for electron microscopy (EM); thus, low-temperature imaging has been developed, initially for aqueous systems. Organic liquids (OLs) are widely used as dispersants, although their cryogenic EM (cryo-EM) imaging is less common than that of aqueous systems. This is because the basic properties (e.
View Article and Find Full Text PDFRapid Commun Mass Spectrom
March 2025
School of Earth, Environment & Society, McMaster University, Hamilton, Ontario, Canada.
Rationale: Carbonate minerals are one of the most popular samples for an automated sample preparation system for CF-IRMS, such as GasBench II and iso FLOW, but no standardized analytical protocols exist. This study gives guidelines on optimal analytic conditions for carbon and oxygen isotope analysis of Ca-Mg carbonates when using the carbonate-phosphoric acid reaction method.
Methods: Calcite (CaCO-McMaster Carrara), dolomite (CaMg(CO)-MRSI Dolomite), and magnesite (MgCO-ROM Brazil Magnesite) with two grain size fractions (< 74 and 149-250 μm) were reacted with 103% (specific gravity of 1.
Alzheimers Dement
December 2024
Laboratory of Clinical Investigation, National Institute on Aging, Intramural Research Program, Baltimore, MD, USA.
Background: Neuroimaging-based evidence suggests that changes in cerebral tissue determinants, including axonal density and myelin content, are associated with aging and neurodegenerative diseases. While neuroimaging markers show strong association with physiological changes, direct validation of their specificity remains challenging. Histology provides useful information for validation, however, faces limitations including denaturation of the sample during preparation.
View Article and Find Full Text PDFBackground: Non-invasive biofluid and MRI measures of blood-brain-barrier (BBB) dysfunction may aid early detection of cerebral small vessel disease (cSVD). Plasma markers of astrocytic function and injury, such as S100 calcium-binding protein B (S100b), have gained increased attention in relation to BBB integrity and cognition. Here we explored the inter-relationships between plasma S100b levels, an MRI measure of water exchange rate across the BBB (kw), and cognitive performance among older adults.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Amsterdam Neuroscience, Neurodegeneration, Amsterdam, Netherlands.
Background: Adequately diagnosing Alzheimer's disease (AD) in primary care can be challenging. Early symptoms often go unrecognized and other (neurodegenerative) diseases may be misdiagnosed as AD. AD blood-based biomarkers could improve the diagnostic process for cognitive complaints in primary care.
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