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Matériaux supramoléculaires
(2) Production(s) de l'année 2024
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Long‐time high‐pressure processing of a patatin‐rich potato proteins isolate: impact on aggregation and surface properties ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Bahri Asma, Charpentier Claudine, Khati Paula, Le Parc R., Chevalier-Lucia Dominique, Picart-Palmade Laetitia
(Article) Publié:
International Journal Of Food Science And Technology, vol. p. (2024)
Ref HAL: hal-04582437_v1
DOI: 10.1111/ijfs.17192
Exporter : BibTex | endNote
Résumé: Summary In this study, a 4% (w/w) dispersion of a commercial patatin‐rich potato protein isolate (Po‐PI) was pressurised at 400 MPa up to 48 h at 20 °C. Protein aggregation induced by high‐pressure processing (HHP) was followed by dynamic light scattering, intrinsic fluorescence ( in‐situ or ex‐situ ) or SAXS analysis. Surface properties (surface hydrophobicity and interfacial properties) of the HHP‐induced aggregates were also investigated. A gradual dimer dissociation/protein unfolding was observed under pressure. Po‐PI exhibited a slow relaxation time under pressure. Long‐time HHP (>4 h) induced significant modification of the Po‐PI protein structure with partial non‐reversible unfolding. After 48 h of pressurisation at 400 MPa, large aggregates (160 nm) were obtained and a monomodal distribution in intensity and in number frequency was observed indicating a controlled aggregation. Up to 24 h of pressurisation at 400 MPa, intermediate states were obtained after high‐pressure release. SDS‐PAGE profiles showed that HHP‐induced aggregation of Po‐PI was driven by non‐covalent interactions. All high‐pressure processed dispersions displayed a higher surface hydrophobicity as compared to non‐treated Po‐PI. Po‐PI dispersion treated for 8 h at 400 MPa presented the lowest adsorption rate, the highest final surface tension and formed the most rigid interfacial film. Po‐PI showed resistance to moderate pressure levels (400 MPa) and long pressure application times were required to induce significant protein denaturation/aggregation (≥24 h) and to optimally modify its interfacial properties (8 h).
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Revealing two chemical strategies to tune bright one- and two-photon excited fluorescence of carbon nanodots ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Mucha S., Firlej L., Formalik F., Bantignies J.-L., Anglaret E., Samoć Marek, Matczyszyn Katarzyna
(Article) Publié:
Journal Of Materials Chemistry C, vol. p. (2024)
Ref HAL: hal-04398741_v1
DOI: 10.1039/D3TC03211F
Exporter : BibTex | endNote
Résumé: Carbon-based dots (CDs) are a novel class of luminescent carbon nanomaterials that have attracted much attention as promising alternatives for cadmium-based quantum dots and fluorescent organic dyes. Although different strategies have been proposed to produce CDs with intense and tuneable one-photon excited fluorescence (OPEF), the case of analogous two-photon excited fluorescence (TPEF) has not been fully explored yet. By varying the synthesis conditions, we produced three types of phloroglucinol-based carbon nanodots (PG CNDs). Their remarkable OPEF and TPEF properties can be tuned by (Ia) the conjugated aromatic domains and (Ib) the content of oxygenous moieties. In addition, the emission colour of the PG CNDs is strongly responsive to (II) the hydrogen-bonding network, enabling colour-switching while maintaining excellent fluorescence yields (both OPEF and TPEF). These three factors were evaluated for their suitability for the tuning of the emission colour. Our studies point out the advantages of the tuneable PG CNDs to be used in optoelectronics and biological application domains.
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