Green Nanoarchitectonics of Cu/Fe3O4 Nanoparticles Using Helleborus niger Extract Towards an Efficient Nanocatalyst, Antioxidant and Anti-lung Cancer Agent
Xue YangBikash KarmakarHuda Salem AlSalemMona Saad BinkademSoha T. Al‐GoulMutasem Z. Bani‐FwazAttalla F. El‐kottAbdullah Mousa AgeeliAbdulrahman A. AlsayeghGaber El‐Saber Batiha
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The DPPH (2,2-diphenyl-1-picrylhydrazyl) assay has been widely used in antioxidant evaluation. However, it suffers from certain limitations that are addressed in this contribution. The limitations discussed in this work were the ratio of DPPH radicals to antioxidants and the presence of pigments in the reaction medium which interferes with absorbance readings. To do so, we used eight different concentrations of DPPH solution. The modified DPPH assay proposes a new concept, IC100, that is defined as the amount of DPPH radical required to oxidize all antioxidants present in the reaction medium. The modified DPPH assay does not suffer from an underestimation of antioxidant activity found in the original DPPH procedure due to the decrease in the ratio of DPPH radicals to antioxidants. Moreover, the modified method was not influenced by interference from coexisting pigments in the measurement of radical scavenging potential of extracts. To the best of our knowledge, this is the first attempt to effectively resolve the above-mentioned limitations of the DPPH assay.
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4 Abstract: Artimisia scoparia is extensively used as a natural therapeutic agent in the treatment of various diseases. The current study was designed to explore antioxidant potential of extract/fractions in DPPH free radical and reducing power assays. The results suggested marked antioxidant potential of extract/fractions in both DPPH and reducing power assays. Of the test articles, ethyl acetate was the most dominant fraction in both assays followed by crude methanolic extract. In conclusion, A. scoparia illustrated an outstanding antioxidant activity.
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This chapter contains sections titled: Introduction Classification of Nanocomposites Structure and Properties of Nanocomposites Production Methods of Nanocomposites Nanocomposite Components Nanocomposite Forms Functions of Nanocomposites in Smart Textiles Future Outlook Conclusion
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Antioxidant activity of the crude methanol extract of Pseudarthria viscida (L) Wight and Arn. stem and root was performed by1,1-diphenyl-2-picrylhydrozyl (DPPH) radical quenching assay and reducing power test models. Both stem and root extracts exhibited potential antioxidant activity in both the assays.
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The XRD analysis were performed to confirm the formation of hydroxyapatite structure in collagen-silver-hydroxyapatite nanocomposites. The molecular interaction in collagen-hydroxyapatite nanocomposites was highlighted by Fourier transform infrared spectroscopy (FTIR) analysis. The SEM showed a nanostructure of collagen-silverhydroxyapatite nanocomposites composed of nano needle-like particles in a veil with collagen texture. The presence of vibrational groups characteristics to the hydroxyapatite structure in collagen-silver-hydroxyapatite (AgHApColl) nanocomposites was investigated by FTIR.
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基于 Cu 的 thermosensitive nanocomposites 被高精力球 milling 做。基于 Cu 的 thermosensitive nanocomposites 的微观结构和性质被传播电子显微镜学(TEM ) 和 themosensitivity 测试学习。milling 时间在微观结构的效果和基于 Cu 的 nanocomposite 材料的 thermosensitivity 被研究。基于 Cu 的 nanocomposite 能被高精力球 milling 做的 Theresults 表演。作为他们， illing 时间增加，在 nanocomposite 的铜粒子尺寸减少，然后， nanocomposite 的 thethermoexpansivity 增加。当 milling 时间直到 100 h 时， nanocomposite 具有最好的 thermoexpansivity。在 35-45 deg C， nanocomposite 显示出好 thermosensitivity。
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This chapter contains sections titled: Introduction Ceramic/Metal Nanocomposites Nanocomposites by Mechanical Alloying Nanocomposites from Sol–Gel Synthesis Nanocomposites by Thermal Spray Synthesis Metal Matrix Nanocomposites Bulk Ceramic Nanocomposites for Desired Mechanical Properties Thin-Film Nanocomposites: Multilayer and Granular Films Nanocomposites for Hard Coatings Carbon Nanotube-Based Nanocomposites Functional Low-Dimensional Nanocomposites Encapsulated Composite Nanosystems Applications of Nanocomposite Wires Applications of Nanocomposite Particles Inorganic Nanocomposites for Optical Applications Inorganic Nanocomposites for Electrical Applications Nanoporous Structures and Membranes: Other Nanocomposites Nanocomposites for Magnetic Applications Particle-Dispersed Magnetic Nanocomposites Magnetic Multilayer Nanocomposites Nanocomposite Structures having Miscellaneous Properties Concluding Remarks on Metal/Ceramic Nanocomposites
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Background: Antioxidants are substances that can reduce free radicals to protect the body's biological systems from adverse effects arising from processes or reactions that cause excess oxidants. Kedondong leaves (Spondias dulcis Forst.) contain flavonoids, tannins, and alkaloids, which have the potential to act as antioxidants. Objective: To determine the antioxidant activity of ethyl acetate and 95% ethanol extracts from kedondong leaves. Methods: The antioxidant activity was tested using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method, a free radical stable in an aqueous solution. Each extract was tested for its antioxidant activity with a comparison compound, vitamin C, using a UV-Vis spectrophotometer. The results of the antioxidant activity test revealed the IC50 (inhibitory concentration) value, namely the concentration of antioxidant compounds capable of inhibiting DPPH free radical activity by 50%. Result: The ethyl acetate extract has weak antioxidant activity with an IC50 value of 194.123 ppm, the 95% ethanol extract has very weak antioxidant activity with an IC50 value of 553.3694 ppm, and vitamin C, as a comparison, has very strong antioxidant activity with an IC50 value of 4.7805 ppm. Conclusion: Kedondong leaves have potential antioxidant activity but are very small.
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Chitosan–silver (CS–Ag) nanocomposite materials were synthesized by a simple chemical method. The synthesized CS–Ag nanocomposite contains 20 wt% silver. Silver nanoparticles were synthesized by chemical reduction method as well. The CS–Ag nanocomposite was characterized using Field emission scanning electronic microscope (FESEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The XRD pattern indicated the presence of both silver and chitosan in the nanocomposite. It is observed from the XRD pattern of silver that it is of cubic structure. The spherical morphology of silver nanoparticles was confirmed from the FESEM image. FTIR spectroscopy was used for the structural elucidation. CS–Ag nanocomposite exhibits good antimicrobial and antitumor properties.
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