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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI Jurnal Matematika & Sains The Journal of Pure and Applied Chemistry Research Jurnal Progres Kimia Sains Chimica et Natura Acta Indonesian Journal of Chemistry
Abdul Haris Watoni
Universitas Halu Oleo
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Environmental Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology

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Development of Affinity Adsorbent System for Purification of Protease Abdul Haris Watoni; Sapto Raharjo; Husein H. Bahti; Soetijoso Soemitro
Jurnal Matematika & Sains Vol 7, No 1 (2002)
Publisher : Institut Teknologi Bandung

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Abstract

The development of affinity adsorbent system for purification of protease produced by Bacillus sp. BAC-4 has been investigated. The research is initiated from preparation of non porous silica, aminopropyl silica matrix, and affinity adsorbent. In this research, the approximately spherical form of non porous silica with diameter of 1 – 15 μm and aminopropyl silica matrix has been synthesized. This matrices contains 65,7 μmol/g of amino group and show the similar FTIR spectrum to that of standard aminopropyl silica. Preparation result of affinity adsorbent shows that 10% n-butanol is the most applicable affinity ligand with 99,96% binding capacity to the matrix. The optimum activity of the purified protease with affinity adsorbent system is in the 0.05 N Tris HCl buffer pH 8.0 at 550C for 15 minutes with the degree of purity of 1248–fold to that in the crude extract.
Studi Aplikasi Metode Potensiometri Pada Penentuan Kandungan Karbon Organik Total Tanah Abdul Haris Watoni; Buchari Buchari
Jurnal Matematika & Sains Vol 5, No 1 (2000)
Publisher : Institut Teknologi Bandung

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STUDI APLIKASI METODE POTENSIOMETRI PADA PENENTUAN KANDUNGAN KARBON ORGANIK TOTAL TANAH In recent years, ion selective electrodes have become more useful for the determination of certain ion in solutions rather than in soil system. The applications of potentiometric for the determination of the total soil organic carbon has been investigated with CO2 selective electrode as indicator electrode. The principle of the determination is base on the conversion of total soil organic carbon in the sample to CO2 and than the CO2 produced was measured potentiometrically by CO2 selective electrode. The concentration of CO2 was proportional with the total soil organic carbon in the samples. Before application for the measurement, the CO2 selective electrode must be characterized. The investigation showed that the respon time of the electrode was 2,5 minutes and it was stable for 40 seconds because the lost of CO2 to the air. The range of concentration for the measurement was between 9.09 x 10-4 M to 3.83 x 10 -1M of CO2 with the Nernst factor was 53 mV per decade and the limit of detection was 4.5 x 10-4 M of CO2 and the optimum pH of the solution was 4.8. The present of CH3COO- and H2PO4- over 10-2 M in concentrations interfered the measurement of CO2 with their potentiometric coefficient of selectivity was 0.36 and 0.133 respectively. The validity of potentiometric method for the determination of the total soil organic carbon was compared with the titrimetric method for the same samples. This investigation showed that the potentiometric method was applicable to the determination of the total soil organic carbon and it was more accurate than the titrimetric method.
Respon Ganda Elektrode Kawat Emas Terlapis Polipirol Terhadap Kation Dan Anion Dari Surfaktan Nads Watoni, Abdul Haris
Jurnal Progres Kimia Sains Vol 1, No 2 (2011): JPKS Open Access
Publisher : Universitas Halu Oleo

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Abstract

The coating of gold wire electrode as working electrode with polypyrrole throughelectropolymerization by ciclyc voltammetry was performanced in the 0.01 M pyrrole solutioncontaining 1,0 ´ 10-4 M HDS dopant and 0.01 M KCl, KBr, and KI supporting electrolytes,respectively. The coated electrode prepared by KCl supporting electrolyte has the respontoward Na+ cations with highest sensitivity of 44.0 mV/decade in the concentration range of5,0 ´ 10-5 – 1,0 ´ 10-3 M and toward DS- anions with highest sensitivity of 26.2 mV/decadein the concentration range of 1,0 ´ 10-15 – 1,0 ´ 10-12 M. Coated electrode prepared by KBrsupporting electrolyte might respon toward Na+ cations with highest sensitivity of 42.4mV/decade in the concentration range of 5,0 ´ 10-4 – 1,0 ´ 10-3 M and toward DS- anionswith highest sensitivity of 35.0 mV/decade. The coated electrode prepared by KI supprotingelectrolyte has a respon toward Na+ cations with highest sensitivity of 49.2 mV/decade in theconcentration range of 5,0 ´ 10-4 – 1,0 ´ 10-3 M and toward DS- anions with highestsensitivity of 16.5 mV/decade in the concentration range of 1,0 ´ 10-15 – 1,0 ´ 10-9 M.
Ag3PO4-Red Banyan Fruit Extract (Ficus benjamina. L) Nanocomposite for Degradation of Detergent Waste Muhammad Ihram Basri; Komang Sri Devi Wahyuni; Yolanda Liambo Tamallum; La Ode Ahmad Nur Ramadhan; Abdul Haris Watoni
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (272.004 KB) | DOI: 10.15408/jkv.v5i2.8390

Abstract

Detergents waste containing SDS (Sodium Dodecyl Sulfate) still becomes a major environmental problem that must be overcomed. The degradation of SDS by silver phosphate (Ag3PO4)-Red Banyan extract nanocomposite was performed under visible light. This research aimed to determine the percentage decrease in SDS concentration  under visible light by using Ag3PO4 facilitated extract of red banyan fruit. The Ag3PO4-Red Banyan extract nanocomposite was prepared by coprecipitation method and facilitated by a red banyan extract solvent. The result showed that the silver composite phosphate (Ag3PO4) facilitated red banyan extract had a percentage of SDS degradation i.e. 85.9% for 2 hours. This result showed that the silver composite phosphate (Ag3PO4)-a red fruit extract becomes a promising ingredient for degrading SDS in aquatic environment environments.
ELECTROCHEMICAL SYNTHEZIS AND CHARACTERIZATION OF POLYPYRROLE FOR DODECYLSULFATE SENSOR MEMBRANE Abdul Haris Watoni; Suryo Gandasasmita; Indra Noviandri; Buchari Buchari
Indonesian Journal of Chemistry Vol 7, No 3 (2007)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (319.735 KB) | DOI: 10.22146/ijc.21665

Abstract

A conducting polymer, polypyrrole, has been electrochemically synthesized from pyrrole monomer using cyclic voltammetry technique in aqueous solution in the presence of HDS dopant and KNO3 supporting electrolyte. The polymer was deposited on the surface of an Au-wire and the modified electrode obtained was then used as dodecylsulfate (DS-) ion sensor electrode. The best performance PPy-DS modified-Au electrode conditioned in the air system without HDS or SDS solution gave linear potential response for the concentration range of 1.0 x 10-5 - 1.0 x 10-3 M, sensitivity of 54.5 mV/decade, detection limit of 1.0 x 10-5 M, and response time of 23 - 30 second.  The electrode showed good selectivity towards other anions, therefore can be used to determine SDS concentration in real samples system without any change of the samples matrix.
Silver Nanoparticles Biosynthesis Using Mangosteen (Garcinia Mangostana L.) Rind Extract For Environmentally Friendly Liquid Disinfectant Active Ingredients Abdul Haris Haris Watoni; La Ode Ahmad Nur Ramadhan; Muhammad Daffa Rahmatullah; Angelina Ike Dwiyanti Kalpen Bunga; Supardi Supardi
The Journal of Pure and Applied Chemistry Research Vol 11, No 1 (2022): Edition January-April 2022
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2022.011.01.654

Abstract

Disinfectant is one of the materials that can be used to inhibit the growth of pathogenic microorganisms, but most of the disinfectants used in the community are disinfectants made from synthetic chemicals that are harmful to the environment. The purpose of this study was to synthesize and evaluate the antimicrobial activity of silver (Ag) nanoparticles- mangosteen rind extract as an active ingredient in an environmentally friendly disinfectant formula. The synthesis process of silver nanoparticles was carried out by adding a bioreductant of mangosteen rind extract into a 0.01 M AgNO3 solution precursor with a variation of the precursor:bioreductor volume ratio of 1:1, 1:2, 1:3, 1:4, 1:5, and 1: 6. The results of the analysis with UV-Vis spectroscopy showed that the silver nanoparticles of mangosteen rind extract had good stability. The decrease in the absorption peak in the FTIR spectrum at a wave number of 3390.86 cm-1 indicates the contribution of the –OH group in the bioreductant compound in the reduction process of silver nanoparticles. PSA analysis and digital microscopy showed that the diameter of the synthesized silver nanoparticles with a volume ratio of bioreductor: precursor 1:1 and 1:2 were 82.33 nm and 356.2 nm, respectively. The antimicrobial activity test showed that the active ingredient mixture of silver-mangosteen rind extract with a composition of 1:1 had the best activity in inhibiting the growth of gram-positive Staphylococcus aureus and gram-negative Eschericia coli bacteria. The results of this study indicate that silver nanoparticles extracted from mangosteen rind are good active ingredients for environmentally friendly liquid disinfectants.
Green Synthesis of Copper Nanoparticles Using Red Dragon Fruit (Hylocereus polyrhizus) Extract and Its Antibacterial Activity for Liquid Disinfectant Cindy Agriningsih Haruna; Widy Aprillia Malik; Muhammad Yaqub Syamsul Rijal; Abdul Haris Watoni; La Ode Ahmad Nur Ramadhan
Jurnal Kimia Sains dan Aplikasi Vol 25, No 10 (2022): Volume 25 Issue 10 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.25.10.352-361

Abstract

The effort of copper nanoparticle exploration for antibacterial cleaning agents needs to prevent infection or contamination of microorganisms such as bacteria and viruses due to its potential characteristic as an environmentally benign material. The synthesis of copper nanoparticles using 0.02 M Cu(NO3)2 as a precursor and red dragon fruit extract as a bioreduction agent has been conducted. The extraction process of red dragon fruit was done by the maceration method using methanol as solvent. Copper nanoparticles were prepared through green chemistry with the reduction method. The compound in red dragon fruit extract reduced Cu2+ to Cu. The experimental nanoparticle synthesis method was performed with a combination of red dragon fruit extract and Cu(NO3)2 solution mixed with a volume ratio of bioreductor extract toward Cu2+ precursor variation of 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, and 1:9. The mixtures were stirred using a magnetic stirrer for 30 minutes and then incubated. The samples were characterized using UV-Vis (Ultraviolet-Visible), FTIR (Fourier Transform Infrared), and a digital microscope to observe morphology. The observation continued to assess its antibacterial activity and potency as an active disinfectant. UV-Vis analysis showed that the absorbance value for 30 minutes tended to be stable. Particle size estimation showed the smallest size of 122.12 nm at a volume ratio of 1:9. Functional group analysis using FTIR showed a shift in wavenumber between dragon fruit extract and copper nanoparticle (CuNPs), indicating a functional group interaction. The results of morphological analysis using a digital microscope showed that the particles with fine powder granules were produced with the composition of fruit extract: Cu(NO3)2 of 1:9. Antibacterial activity against Staphylococcus aureus and Escherichia coli indicated that the composition of Cu-nanoparticles of 1:9 had given an inhibition value.
The Study of Plasmonic Chip of Nata de Sago-green Silver Nanoparticles for Detection of Blood Glucose Abdul Haris Haris Watoni; La Ode A. Nur Ramadhan; Evy Nuryah Adha; Robby Sudarman
Chimica et Natura Acta Vol 11, No 2 (2023)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v11.n2.45909

Abstract

The innovation of rapid blood glucose level detectors using chemical sensors still needs to be carried out continuously. Nata de sago has good potential as a safe sensor chip for blood glucose detection. To increase the detection speed, this sensor chip can be composited with silver nanoparticles (AgNPs)-bidara leaf extract which has plasmonic properties when interacting with visible radiation. The principle of blood glucose detection with the nata de sago-AgNPs-bidara leaf extract composite chip is based on van der Waals interactions between the functional groups in nata de sago and the hydroxyl groups in glucose compounds which are strengthened by the plasmonic nature of AgNPs.This study aims to synthesize and characterize nata de sago cellulose composite films embedded with silver nanoparticles as blood sugar detection sensor chips. Silver nanoparticles (AgNPs) were synthesized from AgNO3 precursors using bioreductors and capping agents of bidara leaf extract (Ziziphus mauritiana L.) with various volume ratios of precursor to bioreductor 1:1, 1:2, 1:3, 1:4, 1:5 and 1:6. The nata de sago-AgNPs-bidara leaf extract composite was made by soaking the nata de sago film in a suspension of AgNPs-bidara leaf extract for 1 hour until the film turned yellow. The film was then dried for 24 hours at room temperature to obtain a cuvette type plasmonic film which was ready for characterization and validation.FTIR analysis showed the formation of silver particles based on vibrational spectra changes of functional groups of bioreductor compounds at wave numbers 3423 cm-1, 2924 cm-1, 1641 cm-1 and 1056 cm-1. Morphological analysis using a digital microscope showed that the AgNPs were not uniformly spherical. Particle size analysis using a UV-Vis spectrophotometer showed that the AgNPs formed had an estimated diameter of 32.231 – 82.261 nm. Composite film of nata de sago-AgNPs-bidara leaf extract can be used as a blood glucose sensor chip by UV-Vis spectrophotometry with LOD = 30.814 mg/dL, LOQ = 50.814, %RSD = 5.015, and %R 90.68. The values of these parameters indicate that the sensor chip has good precision (%RSD) and accuracy (%R).
Co-Authors Angelina Ike Dwiyanti Kalpen Bunga Buchari Buchari Buchari Buchari Cindy Agriningsih Haruna Evy Nuryah Adha Husein Hernadi Bahti Indra Noviandri Komang Sri Devi Wahyuni La Ode A. Nur Ramadhan La Ode Ahmad Nur Ramadhan La Ode Ahmad Nur Ramadhan La Ode Ahmad Nur Ramadhan Muhammad Daffa Rahmatullah Muhammad Ihram Basri Muhammad Yaqub Syamsul Rijal Robby Sudarman Sapto Raharjo Soetijoso Soemitro Supardi Supardi Suryo Gandasasmita Widy Aprillia Malik Yolanda Liambo Tamallum