Fluorescent carbon dots obtained from chitosan gel

Chowdhury, Devasish; Gogoi, Neelam; Majumdar, Gitanjali

doi:10.1039/c2ra21705h

Cited by 138 publications

(114 citation statements)

References 27 publications

(25 reference statements)

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“…CDs from chitosan hydrogels have also been reported by Chowdhury et al [55]. The hydrogels were synthesised from a mixture of acetic acid, glycerol and chitosan, as a more stable starting material for CDs.…”

Section: Reviewmentioning

confidence: 74%

Fluorescent carbon dots from mono- and polysaccharides: synthesis, properties and applications

Hill¹,

Galan²

2017

Beilstein J. Org. Chem.

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Fluorescent carbon dots (FCDs) are an emerging class of nanomaterials made from carbon sources that have been hailed as potential non-toxic replacements to traditional semiconductor quantum dots (QDs). Particularly in the areas of live imaging and drug delivery, due to their water solubility, low toxicity and photo-and chemical stability. Carbohydrates are readily available chiral biomolecules in nature which offer an attractive and cheap starting material from which to synthesise FCDs with distinct features and interesting applications. This mini-review article will cover the progress in the development of FCDs prepared from carbohydrate sources with an emphasis on their synthesis, functionalization and technical applications, including discussions on current challenges. 675

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Section: Reviewmentioning

confidence: 74%

Fluorescent carbon dots from mono- and polysaccharides: synthesis, properties and applications

Hill¹,

Galan²

2017

Beilstein J. Org. Chem.

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“…Typically the tea was first heated at 200 0 C for about 2 h, followed by grinding to powdered form and again heated at 200 0 C for was then centrifuged (at 10,000 rpm for 0.5 h) and the supernatant liquid containing tea CDs was collected and preserved for further use. It is believed that PL emission is consequence of both the quantum size effect and surface defects 16 . A representative Transmission Electron Microscope (TEM) image of CDs shown in Figure 1(C) clearly shows the nano-sized particle obtained from tea dispersed in 0.1 M acetic acid.…”

Section: Resultsmentioning

confidence: 99%

Property relationship of alginate and alginate–carbon dot nanocomposites with bivalent and trivalent cross-linker ions

Konwar

Chowdhury

2015

RSC Adv.

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Synthesis of nanocomposites of biopolymer is answer to obtaining superior properties which are biocompatable but also possessing good mechanical properties. In this work we made an attempt to study the property relationship of Alginate and Alginate-carbon dot nanocomposites with different bivalent and trivalent cross-linker ions. Biopolymer Alginate were crosslinked with five different bivalent and trivalent metal ions and their corresponding carbon-dots (CDs) nanocomposites have been prepared successfully. The carbon dots were prepared from Commercially available 'Assam Tea'. The Alginate and Alginate-carbon dot nanocomposite films were characterized with UV-visible spectroscopy, FTIR, SEM, fluorescent microscopy. The tensile strengths measurements of all the film samples have been carried out. It was observed that Alginate films crosslinked by metal ions with larger size ( Ba 2+ ) show higher tensile strength and higher thermostability. Tensile strength values for Ba 2+ crosslinked Alginate films increased from 24.5 MPa to 43.5 MPa and weight loss at 200 0 C decreased upto 9% on incorporatopn of 2% CDs. Moreover loading of carbon-dots in the crosslinked Alginate system leads to higher absorption in the UV region showing the potential use of Alginate -carbon dot films as UV blocker. For Ca 2+ and Ba 2+ crosslinked films minimum transmittance value significantly reduces to 4 and 5% respectively in the region from 200 to 400 nm for nanocomposite films with maximum 2% CDs. Some mechanastic aspect of superior property shown by Ba 2+ croasslinked Alginate and Alginate-carbon dot nanocomposite is also discussed.

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“…The HR-TEM image also showed clear lattice spacing with an interfringe distance of 0.345 nm, which may be attributed to the (002) facet of the sp 2 graphitic crystal phase of graphene [29]. Most of these CDs were amorphous but a typical X-ray difvia chemical synthesis, such as chemical or thermal oxidation of suitable chemical precursors [14,15], ultrasonic treatment of alkali or acid aqueous solutions of glucose [16,17], and microwave pyrolysis of carbohydrates [18,19]. By contrast, the hydrothermal method is considered to be a facile, green, and efficient approach.…”

Section: Physiochemical Characterizationmentioning

confidence: 96%

Green synthesis of fluorescent carbon dots from carrot juice for in vitro cellular imaging

Liu¹,

Liu²,

Park³

et al. 2017

Carbon letters

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We report the use of carrot, a new and inexpensive biomaterial source, for preparing high quality carbon dots (CDs) instead of semi-conductive quantum dots for bioimaging application. The as-derived CDs possessing down and up-conversion photoluminescence features were obtained from carrot juice by commonly used hydrothermal treatment. The corresponding physiochemical and optical properties were investigated by electron microscopy, fluorescent spectrometry, and other spectroscopic methods. The surfaces of obtained CDs were highly covered with hydroxyl groups and nitrogen groups without further modification. The quantum yield of as-obtained CDs was as high as 5.16%. The cell viability of HaCaT cells against a purified CD aqueous solution was higher than 85% even at higher concentration (700 μg mL −1 ) after 24 h incubation. Finally, CD cultured cells exhibited distinguished blue, green, and red colors, respectively, during in vitro imaging when excited by three wavelength lasers under a confocal microscope. Offering excellent optical properties, biocompatibility, low cytotoxicity, and good cellular imaging capability, the carrot juice derived CDs are a promising candidate for biomedical applications.

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Fluorescent carbon dots obtained from chitosan gel

Cited by 138 publications

References 27 publications

Fluorescent carbon dots from mono- and polysaccharides: synthesis, properties and applications

Fluorescent carbon dots from mono- and polysaccharides: synthesis, properties and applications

Property relationship of alginate and alginate–carbon dot nanocomposites with bivalent and trivalent cross-linker ions

Green synthesis of fluorescent carbon dots from carrot juice for in vitro cellular imaging

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