Hasil Pencarian  ::  Simpan CSV :: Kembali

"Nanopartikel emas memiliki aktivitas sebagai antioksidan sehingga dapat digunakan sebagai konstituen anti-aging. Pembuatan nanopartikel emas menggunakan asam tetrakloroaurat (HAuCl4) dan ekstrak lidah buaya sebagai reduktor dengan dan tanpa natrium sitrat sebagai penstabil kimia telah berhasil dilakukan. Kedua variasi nanopartikel emas dikarakterisasi meliputi spektrum serapan, ukuran partikel, nilai potensial zeta, indeks polidispersitas, pH. Hasil karakterisasi menunjukkan bahwa ukuran partikel nanopartikel emas tanpa penstabil kimia dan nanopartikel emas dengan penstabil kimia berturut-turut adalah 10,256 ± 2,465 nm dan 11,476 ± 4,303 nm. Pengujian aktivitas antioksidan kedua variasi nanopartikel emas dilakukan dengan metode DPPH dan didapatkan nilai rata-rata persen inhibisi nanopartikel emas tanpa stabilisator kimia adalah 72,96%, sedangkan nilai persen inhibisi rata-rata nanopartikel emas dengan stabilisator kimia sebesar 74,61%.

---

The antioxidant activity of gold nanoparticles has been developed as an anti aging constituent. In this study, synthesis of gold nanoparticles using tetrachloroaurate acid (HAuCl4) and aloe vera extract as reductor with ot without sodium citrate as chemical stabilizing agent has been done. Both variant were characterizated for absorption spectra, particle size, zeta potential, polydispersity index, and pH.

From the analyses of particle size of gold nanoparticles without chemical stabilizing agent and with chemical stabilizing agent were 10.256 ± 2.465 nm dan 11.476 ± 4.303 nm. Antioxidant activity of gold nanoparticles were investigated by DPPH method. The mean of inhibition percent both varian were 72.96% and 74.61%."

"With rapidly rising life expectancies and a general lack of understanding about the aging process, the need to treat geriatric diseases is becoming an ever more significant private and public health issue. In Aging Methods and Protocols, Yvonne and Christopher Barnett and a team of recognized international experts detail key biochemical, analytical, and molecular techniques for the investigation of aging at the cellular, tissue, organ, and whole system levels. These cutting-edge methods address a wide range of research needs, from uncovering the factors associated with cell senescence and death, to exploring alterations in the body's ability both to metabolize xenobiotics, and to defend itself against biomolecular damage. State-of-the-art protocols also measure the morphological, functional, and molecular changes that accumulate within mitochrondria over time, and permit the genetic and functional characteristics of the immune system to be determined. Two important case studies examine the role of dietary restriction on life span extension and the use of transgenic animals in the molecular analysis of aging. Wide ranging and highly practical, Aging Methods and Protocols provides today's molecular gerontologists, pharmacologists, and clinical investigators with a gold-standard collection of readily reproducible techniques for identifying those key cellular and molecular processes that might one day make it possible to regulate the aging process"