Recent finding on the Moringa oleifera (M. oleifera) species evidenced the significant pharmacological activities which comply with the claims made in the folk medicine. However there is no conclusive pharmacognostic, nutritional value, phytochemical investigations on the dry peel of M. oleifera till date. The current work discuss on the nutritional value, minerals, vitamins content, amino acids, bioactive compounds and quantitative phytochemical analysis of M. oleifera dry vegetable peel. The result obtained from the above study confirms the presence of carbohydrates, protein, and fat as 7.15 ± 0.15 mg/100 g, 2.5 ± 0.85 mg/100 g and 0.2 ± 0.08 mg/100 g respectively. The dry peel powder of M. oleifera showed high content of potassium with 12.48 ± 0.85 and promising amount of vitamins, amino acids and bioactive compound composition. From the preliminary phytochemical analysis, it was found that the dry vegetable peel contains high content total glycosides, falvonoids and phenolic contents. The preparations of CuO@C nanocomposites were optimized using RSM (Response surface methodology). The synthesized CuO@C nanocomposites were analyzed using various characterization techniques and size and shape of CuO@C nanocomposites determined as 20 nm with cubic shape. The synthesized CuO@C nanocomposites are showed nontoxic on the human erythrocytes and act as a good antibacterial agent on gram negative bacterial strain. © 2019 Elsevier Ltd

Mohana Roopan S

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Surendra T.V

Devipriya D

Rahman Khan M.M

Hassanien R.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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&nbsp;

VIT University

Composites Part B: Engineering

Palladium nanoparticles (Pd NPs) are the very good catalytic agents in many coupling reactions, also these are very well biological agents against bacteria and fungus. M. oleifera capped Pd NPs were synthesized from microwave assisted methanolic extract of M. oleifera peel. To optimize the extraction process RSM (Response Surface Methodology) was applied. To get a good extraction yield BBD (Box-Behnken Design) was employed. The better optimized conditions for the extraction was found as 400 W, 25 mL of CH3OH at 65 °C for 2 min. We observed 61.66 mg of extract yield from this method. Eco-friendly M. oleifera capped Pd NPs were synthesized using M. oleifera peel extract and confirmed using the different characterization techniques like UV- Vis spectroscopy, XRD, SEM and HR-TEM analysis. We found the size of the M. oleifera capped Pd NPs nanoparticles as 27 ± 2 nm and shape of the particles as spherical through the TEM analysis. M. oleifera capped Pd NPs exhibits good antibacterial activity against S. aureus (Staphylococcus aureus) and E. coli (Escherichia coli) bacterial strains and we found the zone inhibition as 0.6 and 0.7 mm. The synthesized M. oleifera capped Pd NPs are screened for hemolytic activity and it proved the M. oleifera capped Pd NPs are non-toxic on RBCs cells. © 2016 Elsevier B.V.

Journal of Photochemistry and Photobiology B: Biology

RSM optimized Moringa oleifera peel extract for green synthesis of M. oleifera capped palladium nanoparticles with antibacterial and hemolytic property

Methanolic extract of Cocos nucifera (C. nucifera) was collected using Soxhlet apparatus. C. nucifera methanolic extract was used to prepare Nickel nanoparticles (Ni NPs). Eco-friendly synthesized Ni NPs were confirmed by several analytical techniques such as UV–Visible spectroscopy (UV–Vis), Fourier Transform Infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive X-ray analysis (EDAX), Transmission Electron Microscope (TEM) and Zeta potential. The obtained results infer that green synthesized Ni NPs are in cubical shape with an average particle size of 47 nm. Synthesized Ni NPs were subjected to pesticidal activity against agricultural pest Callasobruchus maculates (C. maculates) which resulted in 97.31% mortality. These results were compared with commercially available standard Azadirachtin. Also we have studied larvicidal activity against Aedes ageypti (A. ageypti) larvae which resulted in LC 50 and LC 90 value of 259.24, 446.99 ppm respectively and the result proved to be significant which were processed by ANOVA LSD Tukey's test. © 2016 Elsevier B.V.

Spectroscopic investigation of biosynthesized nickel nanoparticles and its larvicidal, pesticidal activities

Biosynthetic methods are alternative approaches which are much safer than the normal techniques (physical and chemical) used for the methods for synthesis of metal nanoparticles. The benefits are sample as it is economic and environment friendly. Herein present investigation, we have reported a microwave mediated eco-friendly synthetic approach for preparing cerium oxide (CeO2) nanoparticles. Here, we used Moringa oleifera peel as the stabilizing and reducing agent towards synthesize of Ce2O NPs via microwave irradiation. The NPs were further characterized using UV-Vis, FT-IR, XRD and HR-TEM techniques. The FTIR analysis confirmed the phytochemical involvement in NPs stabilization. The crystallinity of CeO2 nanoparticles are well demonstrated through X-ray Diffraction and HR-TEM. The TEM images reveal the spherical shape of the CeO2 NPs having an average size of 45nm. Additionally, these CeO2 NPs were used successfully as a catalyst in the degradation of the dye, crystal violet. Also the antibacterial activity of the synthesized CeO2 NPs was evaluated using Staphylococcus aureus (Gram positive bacteria) and Escherichia coli (Gram negative bacteria). CeO2 NPs showed better activity on E. coli than S. aureus. We have demonstrated an eco-friendly preparation of CeO2 nanoparticles, a good photocatalyst and having better antibacterial properties.

Photocatalytic and antibacterial properties of phytosynthesized CeO2 NPs using Moringa oleifera peel extract

Most of the wastes emitted from the food processing industries are not utilized for any further purpose. The economic value of the food waste is very less when compared to the collection or reuse or discard. To increase the economic value we have to design the food waste as useful product or applicable in most of the current field. Nothing is waste in this world with this concept we have investigated the phytochemical analysis of drumstick peel (Moringa oleifera). The result supports the presence of phenols, alkaloids, flavanoids, glycosides and tannins. Since various functional groups containing molecules are present in the extract; it has been further subjected to antibacterial and hemolytic activities. To analysis the antibacterial studies we have employed human pathogenic Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) bacterium. The result of antibacterial activity clearly shows that it possesses significant activity on both bacterial cultures. The hemolytic activity was performed on red blood cells (RBCs). From this result we observed that drumstick peel extract has been considered as non-toxic on RBCs. Malachite green was selected to perform photocatalytic activity. The results stated that the drumstick peel extract possessed good behaviour towards photocatalytic investigation. The malachite green was degraded upto 99.7% using drumstick peel extract.

Phenolic compounds in drumstick peel for the evaluation of antibacterial, hemolytic and photocatalytic activities

Phyto-synthesis of transition metal nanoparticles is gaining importance due to their biocompatibility, low toxicity, green approach and environmental friendly nature. We used mesocarp layer extract of Cocos nucifera and was assessed for the synthesis of silver nanoparticles. The reduction of silver ions occurred when silver nitrate solution was treated with aqueous extract of C. nucifera coir at 60 °C. Synthesized silver nanoparticles (AgNPs) particles were confirmed by analysing the excitation of surface plasmon resonance (SPR) using UV-vis spectrophotometer at 433. nm. Further TEM analysis confirmed the range of particle size as 23 ± 2. nm. The XRD spectrum showed the characteristic Bragg peaks of 1. 1. 1, 2. 0. 0, 2. 2. 0 and 3. 1. 1 facets of the face centered cubic silver nanoparticles and confirms that these nanoparticles are crystalline in nature. Gas chromatography-mass spectrometry (GCMS) of coir extract confirms the presence of hydrocarbon such as nonacosane and heptacosane which may possibly influence the reduction process and stabilization of silver nanoparticles. This is the first account of C. nucifera coir assisted synthesis of biogenic Ag nanoparticles; the nanoparticles are notably smaller and better faceted compared with those synthesized by A. squamosa extracts previously reported. Synthesized Ag nanoparticles were effective anti-larvicidal agent's against Anopheles stephensi and C. quinquefasciatus. © 2012 Elsevier B.V.

Journal	Data powered by TypesetComposites Part B: Engineering
Publisher	Data powered by TypesetElsevier BV
ISSN	1359-8368
Open Access	0