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Green Synthesis of Silver Nanoparticles Using <i>Nigella sativa</i>Seeds and Evaluation of Their Antibacterial Activity

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Advances in Nanoparticles 2020年第2期9卷 41-48页

作者： Marvit Osman Widdatallah Alaa Abdulmoneim Mohamed Ayat Ahmed Alrasheid Hiba Abbas Widatallah Layla Fathi Yassin sahar hussein eltilib Shimaa Abdel Rahman Ahmed Department of Pharmacology Faculty of Pharmacy University of Medical Sciences and Technology Khartoum Sudan Department of Clinical Pharmacy Faculty of Pharmacy University of Medical Sciences and Technology Khartoum Sudan Department of Pharmacognosy Faculty of Pharmacy University of Medical Sciences and Technology Khartoum Sudan Department of Pharmaceutical Chemistry Faculty of Pharmacy University of Medical Sciences and Technology Khartoum Sudan

Synthesis of silver nanoparticles using seeds of Nigella sativa as a capping agent was evaluated in this study. Different concentrations of the aqueous extract of N. sativa with silver nitrate solution were exposed to sunlight;as a force for acceleration of the formulation. Then the silver nanoparticles were characterized by UV-Vis, scanning electron microscope (SEM) and X-ray diffraction (XRD) techniques. Antibacterial activity of the nanoparticles was investigated against Staphylococcus aureus and Escherichia coli by the disc diffusion method. The characterization of nanoparticles was detected by the change in color to yellow-brown which indicated the formulation of silver nanoparticles. Irregular shapes within range of nanoscale were detected using SEM and XRD techniques. The finding suggests that silver nanoparticles may be effectively used as antibacterial agent.

关键词： Silver Nanoparticles Nigella sativa UV-Vis SEM XRD Antibacterial Activity

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Assessment of Usual Fruit, Vegetable and Vitamin C Intakes in a Sample of Egyptian Children: Pilot Study

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Food and Nutrition Sciences 2015年第10期6卷 923-934页

作者： Laila hussein Nehad Hassan Mahmoud Mohamad sahar Abdel Aziz Department of Nutrition National Research Center Giza Egypt

The objective was to create an Egyptian database on the contributors of fruit and vegetables in the diets of preschool children and to estimate the usual daily intakes of fruits, vegetables and vitamin C. A total of 59 healthy boys and girls aged 2.5 - 6 years attending day care centers in urban Giza governorate completed the study by interviewing their mothers on 6x non-consecutive days using the 24 h dietary recall. Participants were classified according to age, gender and socioeconomic class. Prevalence of daily consumptions of fruits and vegetables amounted to 22% and 54%, respectively of the total children. The daily intakes of fruits and vegetables averaged 117.5 and 56.4 g, respectively. The consumption of different types of fruits and vegetables was unevenly distributed by different personal and social variables. Estimated daily vitamin C supply from the diet was 38 mg per child, which satisfied the respective recommended nutrient intake (RNI) of 30 mg for the first six years of life. However, the diet of 15% of the children covered less than 75% of RNI. Top fruits contributing to vitamin C were oranges, guava, watermelon, pears and grapes. Extra foods such as chipsy was consumed by 81% of the children, contributed 18% to daily vitamin C supply and also 58.6 mg sodium. A multilevel intervention strategy is warranted for promoting daily fruit and vegetable intake and healthy eating in early childhood.

关键词： Children Aged 2.5 - 6 Years Fruit & Vegetable Intakes Vitamin C Intake Health Problems & Vit C Deficiency

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