Dual fluorescent labelling of cellulose nanocrystals for pH sensing

Nielsen, Lise Junker; Eyley, Samuel; Thielemans, Wim; Aylott, Jonathan W.

doi:10.1039/c0cc03470c

Cited by 205 publications

(175 citation statements)

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“…This corresponds to a crystallinity drop of The amount of grafted fluorophores is very significant and consists of a large increase when compared with the work of Nielsen et al [20] which reported grafted amounts of [24] or 0.02-0.2 μmol/g 5-(4, 6-dichlorotriazinyl) aminofluorescein (DTAF) achieved by Abitbol et al [44] The absorption spectra of the Cz-a-CNC1, Cz-a-CNC2 and Cz-a-CNC3 ( proportional with the absorption peaks while with increasing concentration, e.g. at 0.08 mg/mL, all the emission spectra display almost the same intensity (Figure 8).…”

Section: Resultsmentioning

confidence: 88%

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Coumarin and carbazole fluorescently modified cellulose nanocrystals using a one‐step esterification procedure

2016

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This article is protected by copyright. All rights reserved Fluorescent cellulose nanocrystals with carbazole and coumarin functionalities were synthesised in a one-step esterification reaction using carbazole-9-yl-acetic acid and coumarin-3-carboxylic acid respectively, using a p-toluenesulfonyl chloride/pyridine system. Characterization with elemental analysis, X-ray diffraction, X-ray photoelectron spectroscopy, infrared, absorption and emission spectroscopy, and AFM and TEM imaging confirmed that a high degree of modification could be achieved (up to DS surf = 1.33) while retaining the CNC core crystallinity and nanoparticle dimensions. The present grafting method gives a straightforward way when compared with previously reported fluorescent labelling methodologies and gives an extremely high grafting density while retaining the CNC crystallinity. UV spectroscopy also indicates fluorescence quenching at high grafting densities so that optimal fluorescence does not necessarily mean maximum grafting density. This

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Section: Resultsmentioning

confidence: 88%

“…Fluorescent polymers have become increasingly used as an important macromolecular material in the development of sensors, [20,21] as fluorescent probes in chemical sensing, [22,23] or for bio-imaging and labelling in nanomedicine. [24] Karakawa et al…”

Section: Introductionmentioning

confidence: 99%

Coumarin and carbazole fluorescently modified cellulose nanocrystals using a one‐step esterification procedure

2016

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“…Nielsen et al (2010) demonstrated a versatile synthetic strategy to obtain fluorescent CNCs for pH sensing. The double bond was introduced onto CNCs by esterification, followed by the thiol-ene Michael addition to introduce amine functionality, which further coupled with the succinimidyl ester dyes containing fluorescein-5 0 -isothiocyanate (FITC) and rhodamine B isothiocyanate (RBITC) (Fig.…”

Section: Esterified Cellulose Containing Aliphatic Moietiesmentioning

confidence: 99%

Functional nanomaterials through esterification of cellulose: a review of chemistry and application

et al. 2018

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As the most abundant biopolymer in nature, cellulose has become a fascinating building block for the design of functional nanomaterials. Owing to the presence of numerous hydroxyl groups, cellulose provides a unique platform for the preparation of new materials via versatile chemical modifications. This critical review aims to present the advances about nanomaterials based on cellulose derivatives with the focus on cellulose esters within the last two decades, including the chemistry and application of these nanostructured materials. This review starts with the introduction on first fundamental aspects about diverse esterification techniques used up to now to modify cellulose. The in situ esterification for the isolation of nanocelluloses and diverse post esterification methods of nanocelluloses for the surface functionalization were highlighted in the following description. Various esterification strategies and further nanostructure constructions have been developed aiming to confer specific properties to cellulose esters, extending therefore their feasibility for highly sophisticated applications, which were summarized with respect to the categories of the introduced ester moieties. Thus, this review assembles and emphasizes the state-of-art knowledge of functional nanomaterials derived from diverse esterified cellulose compounds.

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“…12−15 For instance, CNCs' surfaces were chemically modified to append fluorescent molecules 13,16−19 for bioimaging 12 and pH sensing. 20 These modified CNCs were used for protein/enzyme immobilization studies due to their large surface area (150−250 m 2 /g) and nonporous structure. 21−23 CNCs were explored as a potential drug delivery carrier, where they were capable of binding to ionized and hydrophobic drugs and undergoing controlled release.…”

Section: ■ Introductionmentioning

confidence: 99%

Cationic Poly(2-aminoethylmethacrylate) and Poly(N-(2-aminoethylmethacrylamide) Modified Cellulose Nanocrystals: Synthesis, Characterization, and Cytotoxicity

et al. 2014

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Dual fluorescent labelling of cellulose nanocrystals for pH sensing

Cited by 205 publications

References 21 publications

Coumarin and carbazole fluorescently modified cellulose nanocrystals using a one‐step esterification procedure

Coumarin and carbazole fluorescently modified cellulose nanocrystals using a one‐step esterification procedure

Functional nanomaterials through esterification of cellulose: a review of chemistry and application

Cationic Poly(2-aminoethylmethacrylate) and Poly(N-(2-aminoethylmethacrylamide) Modified Cellulose Nanocrystals: Synthesis, Characterization, and Cytotoxicity

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