The Characterization of Chitosan Nanoparticles by Raman Spectroscopy

2014 ◽  
Vol 665 ◽  
pp. 367-370 ◽  
Author(s):  
Xiao Dan Ren ◽  
Qing Shan Liu ◽  
Hui Feng ◽  
Xiao Ying Yin
Keyword(s):  
Raman Spectroscopy ◽  
Double Bond ◽  
Chitosan Nanoparticles ◽  
Carbon Double Bond

To study the performance of chitosan nanoparticles systematically, we characterized MMA, chitosan and synthesized chitosan nanoparticles by Raman spectroscopy. Through analyzing the characteristic peaks of each substance, we found MMA grafted chitosan by opening its carbon-carbon double bond. So Raman spectroscopy is a very effective way in terms of the characterization of nanomaterials .

Silyl-substituted α,β-Unsaturated Ketones from the Reaction of Silylvinylmetallic Reagents with Acid Anhydrides

1973 ◽  
Vol 51 (12) ◽  
pp. 2024-2032 ◽  
Author(s):  
A. G. Brook ◽  
J. M. Duff
Keyword(s):  
Double Bond ◽  
Low Temperatures ◽  
Silyl Group ◽  
Unsaturated Ketones ◽  
Carbon Double Bond ◽  
Benzoic Anhydride ◽  
Acid Anhydrides ◽  
By Products

The reactions of a series of silyl-substituted vinylmetallic reagents with acetic and benzoic anhydride have been investigated as a general route to α,β-unsaturated ketones having a silyl group attached to the carbon–carbon double bond. The reaction has been found to be generally applicable for acetyl derivatives provided low temperatures are used but the reaction with benzoic anhydride gives poorer results. The i.r. and u.v. spectra of the ketones are discussed. The characterization of novel 1,4-dienes obtained as by-products in the syntheses is also described.

Molecular cloning and characterization of Dbr1, a 2-alkenal reductase from Artemisia annuaThe nucleotide sequence reported in this article has been deposited in the GenBank database under accession No. FJ750460.This paper is one of a selection of papers published in a Special Issue from the National Research Council of Canada – Plant Biotechnology Institute.

Botany ◽  
2009 ◽  
Vol 87 (6) ◽  
pp. 643-649 ◽  
Author(s):  
Yansheng Zhang ◽  
Keat H. Teoh ◽  
Darwin W. Reed ◽  
Patrick S. Covello
Keyword(s):  
Double Bond ◽  
Artemisia Annua ◽  
Sequence Similarity ◽  
National Research Council ◽  
Plant Biotechnology ◽  
In Planta ◽  
Carbon Double Bond ◽  
Expressed Sequence ◽  
Selection Of

The molecular genetics of carbon–carbon double bond reduction in the plant Artemisia annua  L. was studied. Expressed sequence tags from this plant were investigated for sequences with similarity to known double-bond reductases. This resulted in the isolation of a cDNA, corresponding to the gene A. annua Dbr1 (Double bond reductase1), encoding a member of the medium chain dehydrogenase/reductase protein superfamily with sequence similarity to tobacco allyl alcohol dehydrogenase. Recombinant A. annua Dbr1 protein was purified from Escherischia coli and shown to catalyze the reduction of the carbon–carbon double bond of 2-alkenals. This activity included the reduction of the double bond at C11–C13 in the artemisinin precursor artemisinic aldehyde, albeit with unnatural stereochemistry. The substrate specificity, product stereochemistry, and expression pattern of A. annua Dbr1 point to its involvement in planta in the detoxification of 2-alkenals, which may be generated under oxidative stress conditions.

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: V. ROTATIONAL SPECTRA OF ALLENE, ALLENE-d4, AND ALLENE-1,1-d2

1955 ◽  
Vol 33 (12) ◽  
pp. 811-818 ◽  
Author(s):  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
Double Bond ◽  
High Resolution ◽  
Raman Spectra ◽  
Second Order ◽  
Rotational Constants ◽  
Rotational Spectra ◽  
A Value ◽  
Carbon Double Bond

The pure rotational Raman spectra of allene, allene-d4 and allene-1,1-d2 were photographed in the second order of a 21 ft. grating. Two plates of each spectrum were analyzed yielding the following values for the rotational constants:[Formula: see text]These constants lead to the value r0(C=C) = 1.3088 ± 0.001 Å. Also if a value of r0(C—H) = 1.07 ± 0.01 Å is assumed, then [Formula: see text]. It is noted that the length of the carbon–carbon double bond in allene is significantly shorter than that in ethylene.

scholarly journals Preparation and characterization of a self-suspending ultra-low density proppant

RSC Advances ◽  
2021 ◽  
Vol 11 (52) ◽  
pp. 33083-33092
Author(s):  
Zhifeng Luo ◽  
Jianbin Li ◽  
Liqiang Zhao ◽  
Nanlin Zhang ◽  
Xiang Chen ◽  
...  
Keyword(s):  
Double Bond ◽  
Low Density ◽  
Carbon Double Bond

A self-suspending ultra-low density proppant (UDP) was developed based on the polymerization of the unsaturated carbon double bond.

Optimization and Physicochemical Characterization of Chitosan and Chitosan Nanoparticles Extracted from the Crayfish Procambarus clarkii Wastes

2019 ◽  
Vol 38 (2) ◽  
pp. 385 ◽  
Author(s):  
Marwa M. El-Naggar ◽  
Wael S. I. Abou-Elmagd ◽  
Ashraf Suloma ◽  
Hamza A. El-Shabaka ◽  
Magdy T. Khalil ◽  
...  
Keyword(s):  
Procambarus Clarkii ◽  
Chitosan Nanoparticles ◽  
Physicochemical Characterization

scholarly journals Morpho-molecular ex vivo detection and grading of non-muscle-invasive bladder cancer using forward imaging probe based multimodal optical coherence tomography and Raman spectroscopy

The Analyst ◽  
2020 ◽  
Vol 145 (4) ◽  
pp. 1445-1456 ◽  
Author(s):  
Fabian Placzek ◽  
Eliana Cordero Bautista ◽  
Simon Kretschmer ◽  
Lara M. Wurster ◽  
Florian Knorr ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Optical Coherence Tomography ◽  
Imaging System ◽  
Ex Vivo ◽  
Large Field ◽  
Optical Coherence ◽  
Fiber Optic Probe ◽  
Optic Probe ◽  
Muscle Invasive

Characterization of bladder biopsies, using a combined fiber optic probe-based optical coherence tomography and Raman spectroscopy imaging system that allows a large field-of-view imaging and detection and grading of cancerous bladder lesions.

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