A study of the intramolecular hydrogen bond in acylphloroglucinols

Mammino, Liliana; Kabanda, Mwadham M.

doi:10.1016/j.theochem.2009.01.032

Cited by 70 publications

(82 citation statements)

References 63 publications

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“…A removal of IHB1 in B-3 results in an energy increase of 14.1 kcal/ mol. This energy value is also similar to the IHB energy values reported for acylated polyphenol derivatives, which matches the upper energy range of moderate H-bonds [66]. The number of conformers reported in this work is significantly higher than that reported previously [15].…”

Section: Conformational Stability and Geometries Of The Isolated Butesupporting

confidence: 90%

Antioxidant and antimalarial properties of butein and homobutein based on their ability to chelate iron (II and III) cations: a DFT study in vacuo and in solution

Serobatse

Kabanda

2015

Eur Food Res Technol

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and lowest for the Fe coordination on the π system of the aromatic ring). The charge on Fe n+ decreases on coordination to the ligand. AIM analysis suggests that the strong cation···ligand interactions are more likely covalent than ionic in vacuo and entirely ionic in solution. The ability of the ligands to reduce the Fe cation coupled with the strong iron-binding properties has significant implication on their antioxidant and antimalarial activities.

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Section: Conformational Stability and Geometries Of The Isolated Butesupporting

confidence: 90%

Antioxidant and antimalarial properties of butein and homobutein based on their ability to chelate iron (II and III) cations: a DFT study in vacuo and in solution

Serobatse

Kabanda

2015

Eur Food Res Technol

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“…The spectra in Figure 1 show a strong, broad peak at 3200-3600 cm´1, attributable to an O-H stretching vibration consistent with the polyhydroxylated saccharide backbone, and a weak absorption band at 2887-2933 cm´1 consistent with the C-H stretching within each glucose unit [33]. A strong band is appearing at 1423-1433 cm´1 indicates the alkane deformations relating to CH and CH 2 [34]. The peak appearing in the 1330-1369 cm´1 region of the spectra attributes to the in-plane bending vibration of the C-H and C-O groups of the hexose ring in the cellulose.…”

Section: Fourier Transform Infrared Spectroscopy Studiesmentioning

confidence: 98%

Optimizing Extraction of Cellulose and Synthesizing Pharmaceutical Grade Carboxymethyl Sago Cellulose from Malaysian Sago Pulp

et al. 2016

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Abstract:Sago biomass is an agro-industrial waste produced in large quantities, mainly in the Asia-Pacific region and in particular South-East Asia. This work focuses on using sago biomass to obtain cellulose as the raw material, through chemical processing using acid hydrolysis, alkaline extraction, chlorination and bleaching, finally converting the material to pharmaceutical grade carboxymethyl sago cellulose (CMSC) by carboxymethylation. The cellulose was evaluated using Thermogravimetric Analysis (TGA), Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) and Field Emission Scanning Electronic Microscopy (FESEM). The extracted cellulose was analyzed for cellulose composition, and subsequently modified to CMSC with a degree of substitution (DS) 0.6 by typical carboxymethylation reactions. X-ray diffraction analysis indicated that the crystallinity of the sago cellulose was reduced after carboxymethylation. FTIR and NMR studies indicate that the hydroxyl groups of the cellulose fibers were etherified through carboxymethylation to produce CMSC. Further characterization of the cellulose and CMSC were performed using FESEM and DSC. The purity of CMSC was analyzed according to the American Society for Testing and Materials (ASTM) International standards. In this case, acid and alkaline treatments coupled with high-pressure defibrillation were found to be effective in depolymerization and defibrillation of the cellulose fibers. The synthesized CMSC also shows no toxicity in the cell line studies and could be exploited as a pharmaceutical excipient.

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“…A robust/strong band seems at 1429.39cm -1 of jackfruit and commercial celluloses indicates the aliphatic compound deformations with reference to CH and CH2 (Mammino & Kabanda, 2009). Moreover, the intensity peak refers the cellulose structure involves the dominant peak at 1371.39cm -1 of jackfruit and commercial celluloses to be attributed to the O-H bending vibration (Sukyai et al, 2015).…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

EXTRACTION AND CHARACTERIZATION OF CELLULOSE FROM JACKFRUIT (Artocarpus integer) PEEL

Sundarraj¹,

Coimbatore²,

TamilNadu³

et al. 2018

JEBAS

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In the present study, cellulose was extracted from de-pectinated peel of Jackfruit. The peel was treated with alkali followed by a chemical process treatment. In present study, yield of jackfruit cellulose was 27g / 100g. The average particle size and zeta potential value of extracted cellulose is 0.730nm and -15.7mV respectively. Further, morphological characterization was carried out by using scanning microscopy. FTIR spectroscopy analysis revealed the presence of major absorptions indicative of cellulose and hemicellulose. The thermal profiles of the residual waste occurred in a minimum three steps, which representing the degradation profiles of hemicellulose, cellulose, and lignin * Corresponding author

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A study of the intramolecular hydrogen bond in acylphloroglucinols

Cited by 70 publications

References 63 publications

Antioxidant and antimalarial properties of butein and homobutein based on their ability to chelate iron (II and III) cations: a DFT study in vacuo and in solution

Antioxidant and antimalarial properties of butein and homobutein based on their ability to chelate iron (II and III) cations: a DFT study in vacuo and in solution

Optimizing Extraction of Cellulose and Synthesizing Pharmaceutical Grade Carboxymethyl Sago Cellulose from Malaysian Sago Pulp

EXTRACTION AND CHARACTERIZATION OF CELLULOSE FROM JACKFRUIT (Artocarpus integer) PEEL

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