Institut für Chemie und Bioanalytik
Dauerhafte URI für die Sammlunghttps://irf.fhnw.ch/handle/11654/24
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Ergebnisse nach Hochschule und Institut
Publikation High-throughput silica nanoparticle detection for quality control of complex early life nutrition food matrices(American Chemical Society, 2024) Maffeis, Viviana; Otter, Andrea; Düsterloh, André; Kind, Lucy; Palivan, Cornelia; Saxer, SinaThe addition of nanomaterials to improve product properties has become a matter of course for many commodities: e.g., detergents, cosmetics, and food products. While this practice improves product characteristics, the increasing exposure and potential impact of nanomaterials (<100 nm) raise concerns regarding both the human body and the environment. Special attention should be taken for vulnerable individuals such as those who are ill, elder, or newborns. But detecting and quantifying nanoparticles in complex food matrices like early life nutrition (ELN) poses a significant challenge due to the presence of additional particles, emulsion-droplets, or micelles. There is a pressing demand for standardized protocols for nanoparticle quantification and the specification of “nanoparticle-free” formulations. To address this, silica nanoparticles (SiNPs), commonly used as anticaking agents (AA) in processed food, were employed as a model system to establish characterization methods with different levels of accuracy and sensitivity versus speed, sample handling, and automatization. Different acid treatments were applied for sample digestion, followed by size exclusion chromatography. Morphology, size, and number of NPs were measured by transmission electron microscopy, and the amount of Si was determined by microwave plasma atomic emission spectrometry. This successfully enabled distinguishing SiNP content in ELN food formulations with 2–4% AA from AA-free formulations and sorting SiNPs with diameters of 20, 50, and 80 nm. Moreover, the study revealed the significant influence of the ELN matrix on sample preparation, separation, and characterization steps, necessitating method adaptations compared to the reference (SiNP in water). In the future, we expect these methods to be implemented in standard quality control of formulation processes, which demand high-throughput analysis and automated evaluation.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Self-Assembling Peptide Matrix for treatment of dentin hypersensitivity: A randomized controlled clinical tria(American Academy of Periodontology, 03/2018) Schlee, Markus; Rathe, Florian; Bommer, Claudine; Kind, LucyPatient-reported dentin hypersensitivity [DHS] pain is a common finding linked with periodontal disease. This pilot clinical study investigates a novel therapeutic regimen using self-assembling peptide matrix [SAPM] gel (test) compared with use of an 8% arginine and calcium carbonate [ACC] toothpaste (control) for treatment of DHS.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Biomimetic Remineralization of Carious Lesions by Self-Assembling Peptide(SAGE, 27.03.2017) Kind, Lucy; Stevanovic, Sabrina; Wuttig, Sina; Wimberger, Sandra; Hofer, Joëlle; Müller, Bert; Pieles, UweSelf-assembling β-sheet forming peptide P11-4 has shown potential in the treatment and prevention of dental caries by supporting tissue regeneration. It has previously been shown that application of monomeric P11-4 solution to early carious lesions can increase net mineral gain by forming de novo hydroxyapatite crystals. The hypothesis for the mode of action was that monomeric self-assembling peptide P11-4 diffuses into the subsurface lesion body and assembles therein into higher order fibrils, facilitating mineralization of the subsurface volume by mimicking the natural biomineralization of the tooth enamel.01A - Beitrag in wissenschaftlicher Zeitschrift