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A SIMPLE SYNTHESIS OF NICKEL OXIDE NANOTUBE USING HIGH VOLTAGE ELECTROLYSIS Pramana, Yanatra Budi; Setiawan, Bramianto; Prihono, Prihono; Utomo, Yitno; Subandowo, Marianus; Budipramana, Krisyanti
Jurnal Neutrino:Jurnal Fisika dan Aplikasinya Vol 13, No 1 (2020): October
Publisher : Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/neu.v13i1.10224


Recently, the development of nanoparticle nickel oxide has increased due to their potential application such as biosensors, catalysts, solar cells, supercapacitors, and batteries. In this work, the addition of CTAB for nickel oxide nanoparticle synthesis using electrolysis was investigated.  The nickel plates were used as anode and cathode in the electrolysis process. The process was operated at a constant voltage of 60 V for 30 minutes. The XRD result showed conformity with the Nickel oxide diffraction pattern. Meanwhile, the impurity from nickel hydroxide peaks still appeared. From FTIR characterization also indicates the band of Ni-O stretching vibration. The morphology characterization of nickel oxide using Scanning Electron Microscopy (SEM) showed the nanotube structure, while Transmission Electron Microscopy showed the nanoparticle size from 250.44 to 325.60 nm in length. On the other hand, the transformation of Ni(OH)2 to NiO has been shown using TGA characterization.
The Inhibition of 15-Lipoxygenase by Blechnum orientale Leaves and its Glycoside-flavonoid Isolates: In Vitro and In Silico Studies Rissyelly Rissyelly; Syaikhul Aziz; Frangky Sangande; Agung Wibawa Mahatva Yodha; Krisyanti Budipramana; Elfahmi Elfahmi; Sukrasno Sukrasno
HAYATI Journal of Biosciences Vol. 29 No. 3 (2022): May 2022
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.29.3.353-359


Fern is one of the groups of primitive plants rich in secondary metabolites that are commonly used to treat various diseases, including antioxidant, anti-hyaluronidase, anti-inflammation, and respiratory disease but less investigated. Flavonoid is one of the secondary metabolites abundantly present in ferns. This study aims to isolate major compounds found in Blechnum orientale act as 15-lipoxygenase (15-LOX) inhibitors. Inhibition of lipoxygenase decrease the production of leukotriene that induces bronchoconstriction in asthma. Isoquercitrin (Quercetin-3-O-β-glucopyranoside) and trifolin (kaempferol-3-O-β-D-galactoside) have been successfully isolated from Blechnum orientale. Further in silico study was performed to explain the binding mode between flavonoid pyranoside or galactoside and flavonoid aglycone in the 15-LOX cavity and their amino acid residues interaction. Isoquercitrin binds with Ile663, Ile400, Leu408, Leu597, Ala404, and Arg403 in the 15-LOX cavity as a lipoxygenase inhibitor. Trifolin binds the same amino acids as isoquercetin with addition His366, Gln596, and Phe175. Both isoquercitrin and trifolin act as competitive inhibitors against lipoxygenase enzymes.
Electrochemical Synthesis of Nickel Hydroxide Ni(OH)2 Nanoparticles Solution for Detecting Mercury (Hg) Yanatra Budi Pramana; Djoko Adi Walujo; Marianus Subandowo; Indah Nurhayati; Fauziatul Fajaroh; Krisyanti Budipramana
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 5, No 2 (2021)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (211.891 KB) | DOI: 10.17977/um0260v5i22021p008


Nickel hydroxide Ni(OH)2  nanoparticles were used as sensors for mercury (Hg) in water using a UV-Vis spectrophotometer instrument. The synthesis of Ni(OH)2  nanoparticles was carried out by electrochemical method using nickel plates as anode and cathode and  the process was operated at  constant voltage of 25 V for 30 minutes. In this study, 2 variations of the concentration of Ni(OH)2  nanoparticles were used, namely (5 mL and 4 mL) to detect mercury at concentrations of 0 ppm, 10 ppm, 20 ppm, 30 ppm, 40 ppm, and 50 ppm. Changes in the absorbance value of Ni(OH)2  nanoparticles will be observed. From the observations, there was a decrease in the absorbance value of Ni(OH)2  nanoparticles along with the increase in mercury concentration. The decrease in the absorbance value of Ni(OH)2  nanoparticles is directly proportional to the amount of mercury concentration. The detection limit value was obtained at a volume of 5 mL and 4 mL are 42 ppm, and 75.8  ppm.