A5067239301- biodegradable polymer synthesis and properties
- Chemistry and Chemical Engineering
- Enzyme Catalysis and Immobilization
- Catalysis for Biomass Conversion
- Biochemical and biochemical processes
- Lignin and Wood Chemistry
- Light effects on plants
- Synthetic Organic Chemistry Methods
- Skin Protection and Aging
- Enzyme-mediated dye degradation
- Chemical Synthesis and Reactions
- Plant biochemistry and biosynthesis
- Photochromic and Fluorescence Chemistry
- Microbial Metabolic Engineering and Bioproduction
- Analytical Chemistry and Chromatography
- Phytochemicals and Antioxidant Activities
- Sirtuins and Resveratrol in Medicine
- Biofuel production and bioconversion
- Plant Gene Expression Analysis
- Carbohydrate Chemistry and Synthesis
- Synthesis of Organic Compounds
- Mesoporous Materials and Catalysis
- Antioxidant Activity and Oxidative Stress
- Lipid metabolism and biosynthesis
- Synthesis of Indole Derivatives
Agro-Biotechnologies Industrielles
2016-2025
AgroParisTech
2015-2025
AgroBio
2014-2025
Université Paris-Saclay
2016-2024
Institut de Chimie Moléculaire de Reims
2019-2024
Centre National de la Recherche Scientifique
2016-2019
Université de Reims Champagne-Ardenne
2014-2019
Institut Jean-Pierre Bourgin
2015-2017
Institut National de la Recherche Agronomique
2015
Food Process Engineering and Microbiology
2015
Sunscreens are aimed at protecting skin from solar ultraviolet (UV) irradiation. By utilizing femtosecond transient absorption spectroscopy and time-dependent density functional theory, we explain nature's selection of sinapoyl malate rather than sinapic acid as the plant sunscreen molecule. In physiological pH conditions, two molecules deprotonated, their excited ππ* states found to relax ground in a few tens picoseconds via barrierless trans–cis photoisomerization. After cis-photoproduct...
Baeyer–Villiger oxidation of levoglucosenone with CAL-B and solid buffers provided valuable lactones in high yields only 2 hours while allowing enzyme recyclability.
Aqueous H<sub>2</sub>O<sub>2</sub>-mediated Baeyer–Villiger oxidation of levoglucosenone provides valuable chiral lactone <bold>HBO</bold> in one step without an organic solvent, catalyst nor acid.
Novel monomers were prepared through a chemo-enzymatic route from cellulose-based levoglucosenone and polymerized via thiol-ene click-chemistry. The resulting materials proved suitable for 3D-printing, offering well-defined three-dimensional objects.
Abstract This paper reports the preparation, characterization, and performance of three low viscosity fully bio‐based benzoxazine resins synthesized from furfurylamine, paraformaldehyde, new enzymatic originated diphenols obtained through a sustainable highly selective lipase‐catalyzed process p ‐coumaric acid, diols (propanediol, butanediol, isosorbide, respectively). The method is used for first time, to authors’ knowledge, design specific diphenolic structures dedicated preparation...
β–β′ dimers of sinapate esters are anti-UV and antiradical chemicals.
Stilbenes are specialized metabolites that particularly abundant in Vitis species. Although the biosynthetic pathways of stilbenes have been well-characterized, role specific peroxidases stilbene oligomerization remains to be investigated. In this study, we used grapevine cell cultures characterize functional vinifera peroxidase 4 (VvPRX4) production resveratrol oligomers after elicitation with methyl jasmonate (MeJA). We showed MeJA triggers accumulation t-resveratrol, dimers, and predicted...
Derivatised aurones, based on phytochemical flavonoids, were synthesized and studied using steady‐state ultrafast spectroscopy techniques. Aurones’ strong ultraviolet (UV) visible absorption, in addition to being found abundance fruits, vegetables flowers, makes them ideal photoprotection candidates for agrochemicals. Agrochemicals are well known exhibit poor photostability, the of photoprotectants their formulations thus increases longevity, thereby environmental sustainability. The results...
Sinapate esters are used throughout the plant kingdom, for example in photoprotection from ultraviolet radiation.
We explore the effects of solvent viscosity on trans-cis photoisomerization sinapoyl malate, which is utilized as a sunscreen molecule in plants. Our results demonstrate that has significant effect timescale for isomerization, providing insight into nuclear motions involved. The ramifications these findings are discussed with reference to malate's vivo photoprotection properties.
Abstract The cross‐linking of plant cell walls by ferulate dehydrodimerization reactions is well established. Recently, a (5‐5′)/(8′‐ O ‐4″) dehydrotrimer ferulic acid ( A ) was isolated from alkali extracts maize bran. Its structure elucidated on the basis an extensive structural analysis (UV, MS, 1D and 2D NMR). This first identified has revealed that parietal polysaccharide chains can be more extensively cross‐linked than been previously recognized. To produce in sufficient high‐purity...
Abstract The plant sunscreen derivative methyl sinapate is studied in the gas‐ and solution‐phase as an important step understanding structure‐dynamics‐function relationship of sunscreens such sinapoyl malate. Results from gas‐phase experiments suggest a three deactivation process after photoexcitation. Photoexcitation to S 1 state results internal vibrational energy redistribution within 3 ps. Intersystem crossing then occurs 30 ps between T latter persists outside our probe window ( ns)....
The aim of this paper is to study the effect pH on extraction sinapic acid and its derivatives from mustard seed meal. Solutions acidic (pH 2), basic 12) distilled water (uncontrolled ~ 4.5) were tested at different percentages ethanol. maximum yield for (13.22 µmol/g dry matter (DM)) was obtained with a buffered aqueous solution 12. For ethyl sinapate, reached 9.81 DM 70% ethanol/buffered sinapine (15.73 DM) achieved 2. antioxidant activity each extract assessed by DPPH assay; results...
Resveratrol dimers are of great interest for pharmaceutical and cosmetic applications. Nevertheless, the yield their bioproduction is limited by both competition between possible radical–radical coupling pathways complex isolation procedures. Alternative organic synthesis methods do not afford higher yields. Although enzymatic routes can provide in one step from resveratrol, biocatalysis optimization required to improve yields orient selectivity toward a specific resveratrol dimer,...
In this study, our efforts were focused on the optimization of phenolic compounds - mainly sinapine extraction from residues industrial mustard production. A preliminary work was conducted to discuss way data Folin-Ciocalteu analytical method are reported and exploited in literature, determine whether methanol can be replaced by ethanol as extracting solvent. As first question had found a positive answer, an process crude pretreated residue achieved using Response Surface Methodology (RSM)....
Chiral epoxides-such as ethyl and methyl (S)-3-(oxiran-2-yl)propanoates ((S)-1a/1b)-are valuable precursors in many chemical syntheses. Until recently, these compounds were synthesized from glutamic acid four steps (deamination, reduction, tosylation epoxide formation) low to moderate overall yield (20%-50%). Moreover, this procedure requires some harmful reagents such sodium nitrite ((eco)toxic) borane (carcinogen). Herein, starting levoglucosenone (LGO), a biobased chiral compound obtained...
Chirality is greatly sought for pharmaceutical compounds or fragrances and flavors. (S)-γ-Hydroxymethyl-α,β-butenolide (HBO) a chiral (5H)-furanone that provides polarized double bond, lactone ring, primary alcohol as playground synthetic chemists. This molecule has been used 40 years in wide range of pathways to natural and/or bioactive molecules. Its own synthesis, always from biosourced product, also significantly evolved can be now achieved both at large scale by applying green chemistry...