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Caprara D, Ripanti F, Capocefalo A, Ceccarini M, Petrillo C, Postorino P. Exploiting SERS sensitivity to monitor DNA aggregation properties. Int J Biol Macromol 2020; 170:88-93. [PMID: 33358955 DOI: 10.1016/j.ijbiomac.2020.12.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/19/2020] [Accepted: 12/05/2020] [Indexed: 01/11/2023]
Abstract
In the last decades, DNA has been considered far more than the system carrying the essential genetic instructions. Indeed, because of the remarkable properties of the base-pairing specificity and thermoreversibility of the interactions, DNA plays a central role in the design of innovative architectures at the nanoscale. Here, combining complementary DNA strands with a custom-made solution of silver nanoparticles, we realize plasmonic aggregates to exploit the sensitivity of Surface Enhanced Raman Spectroscopy (SERS) for the identification/detection of the distinctive features of DNA hybridization, both in solution and on dried samples. Moreover, SERS allows monitoring the DNA aggregation process by following the temperature variation of a specific spectroscopic marker associated with the Watson-Crick hydrogen bond formation. This temperature-dependent behavior enables us to precisely reconstruct the melting profile of the selected DNA sequences by spectroscopic measurements only.
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Affiliation(s)
- Debora Caprara
- Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| | | | - Angela Capocefalo
- Istituto dei Sistemi Complessi-CNR c/o Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Marina Ceccarini
- National Centre for Rare Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
| | - Caterina Petrillo
- Physics and Geology Department, University of Perugia, Via A. Pascoli, 06123 Perugia, Italy
| | - Paolo Postorino
- Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
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Danthine S, Vors C, Agopian D, Durand A, Guyon R, Carriere F, Knibbe C, Létisse M, Michalski MC. Homogeneous triacylglycerol tracers have an impact on the thermal and structural properties of dietary fat and its lipolysis rate under simulated physiological conditions. Chem Phys Lipids 2019; 225:104815. [PMID: 31494102 DOI: 10.1016/j.chemphyslip.2019.104815] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/20/2019] [Accepted: 09/01/2019] [Indexed: 10/26/2022]
Abstract
Dietary fats are present in the diet under different types of structures, such as spread vs emulsions (notably in processed foods and enteral formula), and interest is growing regarding their digestion and intestinal absorption. In clinical trials, there is often a need to add stable isotope-labeled triacylglycerols (TAGs) as tracers to the ingested fat in order to track its intestinal absorption and further metabolic fate. Because most TAG tracers contain saturated fatty acids, they may modify the physicochemical properties of the ingested labeled fat and thereby its digestion. However, the actual impact of tracer addition on fat crystalline properties and lipolysis by digestive lipases still deserves to be explored. In this context, we monitored the thermal and polymorphic behavior of anhydrous milk fat (AMF) enriched in homogeneous TAGs tracers and further compared it with the native AMF using differential scanning calorimetry and power X-ray diffraction. As tracers, we used a mixture of tripalmitin, triolein and tricaprylin at 2 different concentrations (1.5 and 5.7 wt%, which have been used in clinical trials). The addition of TAG tracers modified the AMF melting profile, especially at the highest tested concentration (5.7 wt%). Both AMF and AMF enriched with 1.5 wt% tracers were completely melted around 37 °C, i.e. close to the body temperature, while the AMF enriched with 5.7 wt% tracers remained partially crystallized at this temperature. Similar trends were observed in both bulk and emulsified systems. Moreover, the kinetics of AMF polymorphic transformation was modified in the presence of tracers. While only β' form was observed in the native AMF, the β-form was clearly detected in the AMF containing 5.7 wt% tracers. We further tested the impact of tracers on the lipolysis of AMF in bulk using a static in vitro model of duodenal digestion. Lipolysis of AMF enriched with 5.7 wt% tracers was delayed compared with that of AMF and AMF enriched with 1.5 wt% tracers. Therefore, low amounts of TAG tracers including tripalmitin do not have a high impact on fat digestion, but one has to be cautious when using higher amounts of these tracers.
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Affiliation(s)
- Sabine Danthine
- Science des Aliments et Formulation, Gembloux Agro-Bio Tech, ULiège, Gembloux, Belgium
| | - Cécile Vors
- Univ-Lyon, CarMeN laboratory, INRA UMR1397, INSERM U1060, INSA-Lyon, Université Claude Bernard Lyon 1, F-69621 Villeurbanne, France; Centre de Recherche en Nutrition Humaine Rhône-Alpes (CRNH), Centre Européen pour la Nutrition et la Santé (CENS), Pierre-Bénite, France
| | - Damien Agopian
- Univ-Lyon, CarMeN laboratory, INRA UMR1397, INSERM U1060, INSA-Lyon, Université Claude Bernard Lyon 1, F-69621 Villeurbanne, France
| | - Annie Durand
- Univ-Lyon, CarMeN laboratory, INRA UMR1397, INSERM U1060, INSA-Lyon, Université Claude Bernard Lyon 1, F-69621 Villeurbanne, France
| | - Romain Guyon
- Univ-Lyon, CarMeN laboratory, INRA UMR1397, INSERM U1060, INSA-Lyon, Université Claude Bernard Lyon 1, F-69621 Villeurbanne, France
| | - Frédéric Carriere
- Aix Marseille Université, CNRS, Bioénergétique et Ingénierie des Protéines UMR7281, Marseille, France
| | - Carole Knibbe
- Univ-Lyon, CarMeN laboratory, INRA UMR1397, INSERM U1060, INSA-Lyon, Université Claude Bernard Lyon 1, F-69621 Villeurbanne, France; Inria "Beagle" team, Antenne Lyon la Doua, F-69603, Villeurbanne, France
| | - Marion Létisse
- Univ-Lyon, CarMeN laboratory, INRA UMR1397, INSERM U1060, INSA-Lyon, Université Claude Bernard Lyon 1, F-69621 Villeurbanne, France
| | - Marie-Caroline Michalski
- Univ-Lyon, CarMeN laboratory, INRA UMR1397, INSERM U1060, INSA-Lyon, Université Claude Bernard Lyon 1, F-69621 Villeurbanne, France; Centre de Recherche en Nutrition Humaine Rhône-Alpes (CRNH), Centre Européen pour la Nutrition et la Santé (CENS), Pierre-Bénite, France.
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