Polybenzoxazines: recent advances

Kumar, B. Satheesh; Kumar, Krishna

doi:10.1016/b978-0-12-821632-3.00027-0

Cited by 4 publications

(3 citation statements)

References 111 publications

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“…The results suggest that Portulaca oleraceae L. is a valuable food source due to its high Vitamin C content, in line with another study [37] that identified certain herbs with nutritional value because of their rich Vitamin C content. Additionally, it agrees with findings from [31] which revealed its richness in ascorbic acid, and beta-carotene [39,38], and also mentioned that Vitamin C is known for its role in collagen synthesis in connective tissues and its antioxidant properties [ 24 ] .…”

Section: Evaluation Of Vitamin Csupporting

confidence: 91%

Identification of some Phenolic Compounds of Purslane Extracts (Portulaca Oleraceae L.) and Evaluation its Content from vit.E and vit.C and its Antioxidant Activity in Iraq

Al-Sultani,

Ajeena

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The phenolic compounds present in the four extracts of both stems and leaves of the Portulaca Oleraceae L. were diagnosed using HPLC, and the following observations were made: In the alcoholic extract of the leaves, the highest concentration was found in Gallic acid at 77.89 ppm, followed by other phenolic compounds represented by Quercetin, chlorogenic acid, Ferulic acid, Kemopferol, and p-Coumaric at concentrations of 55.8, 50.22, 40.25, 24.15, and 19.25 ppm, respectively. In the aqueous extract of the leaves, the highest concentration was found in Gallic acid at 62.59 ppm, followed by other phenolic compounds Quercetin, chlorogenic acid, Ferulic acid, p-Coumaric, and Kemopferol at concentrations of 41.25, 40.23, 29.58, 16.25, and 16.22 ppm, respectively. In the alcoholic extract of the stems, it was found to contain four phenolic compounds with Gallic acid having the highest concentration at 40.56 ppm, followed by chlorogenic acid, Quercetin, and Kemopferol at concentrations of 33.65, 30.25, and 14.25 ppm, respectively. In the aqueous extract of the stems, it was found to contain four phenolic compounds with Gallic acid having the highest concentration at 33.69 ppm, followed by Quercetin, chlorogenic acid, and Kemopferol at concentrations of 21.45, 20.58, and 11.48 ppm, respectively. The vitamin C and vitamin E contents were evaluated in the extracts. The highest concentration of vitamin E was found in the aqueous extract of the leaves, followed by the alcoholic extract of the leaves, the aqueous extract of the stems, and the alcoholic extract of the stems, with concentrations of 54.1, 33.5, 31.5, and 25.9 ppm, respectively. As for vitamin C concentration, it was found to be highest in the aqueous extract of the leaves, followed by the aqueous extract of the stems, the alcoholic extract of the leaves, and finally the alcoholic extract of the stems, with concentrations of 85.6, 66.5, 52.8, and 35.6 ppm, respectively. The antioxidant activity of the aqueous and alcoholic extracts of the leaves and stems of Portulaca Oleraceae L. was measured by assessing the removal percentage using the FeCl2 and H2O2 methods. The alcoholic extract of the leaves showed the highest removal percentage of 94.73% at a concentration of 150 mg/ml using the FeCl2 method, and the highest DNA protection percentage of 92.73% at a concentration of 150 mg/ml using the H2O2 method.

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Section: Evaluation Of Vitamin Csupporting

confidence: 91%

Identification of some Phenolic Compounds of Purslane Extracts (Portulaca Oleraceae L.) and Evaluation its Content from vit.E and vit.C and its Antioxidant Activity in Iraq

Al-Sultani,

Ajeena

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…9,10 The toughness and rigidity of polybenzoxazine can be manipulated using long chain amines and other soft group precursors, 11 such as hydrosilylation, 12–16 Diels–Alder, 17–20 esterification 21,22 and copolymerization. 23,24 The thermal and mechanical strength of polybenzoxazine systems can be increased by the use of filler-reinforced materials such as silica and carbon 25–27 and they have been successfully applied to obtain curable polymers bearing benzoxazines with designed properties.…”

Section: Introductionmentioning

confidence: 99%

“…Over the past two decades, the research interest was directed towards benzoxazine based smart and advanced materials rather than developing alternative materials to conventional phenolic epoxy and their composites. Similarly, polybenzoxazines have been used to produce several smart materials such as smart coatings, 11,22,23 shape memory polybenzoxazines, 31–34 superhydrophobic surfaces, 35,36 and self-cleaning surfaces. 37,38 The occurrence of self-healing, repairing or recycling was common in nature.…”

Section: Introductionmentioning

confidence: 99%