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All Journal Journal of Marine Research KOVALEN: Jurnal Riset Kimia GERVASI: Jurnal Pengabdian kepada Masyarakat Dimasejati: Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Visi Pengabdian Kepada Masyarakat Journal Of Human And Education (JAHE) Journal of The Indonesian Society of Integrated Chemistry
Faradisa Anindita
Program Studi Kimia, Universitas Sembilan November Kolaka
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Public Health Social Sciences Other

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Journal : KOVALEN: Jurnal Riset Kimia

 1 
EKSTRAKSI DAN KARAKTERISASI GLUKOMANAN DARI TEPUNG BIJI SALAK (Salacca edulis Reinw.) Faradisa Anindita; Syaiful Bahri; Jaya Hardi
KOVALEN: Jurnal Riset Kimia Vol. 2 No. 2 (2016)
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (568.798 KB)

Abstract

This research aims to determine the shaking time and ratio of salak seed flour : anti-solvent isopropyl alcohol to produce glucomannan extract with high yield and high quality. Glucomannan extraction process from salak seed flour is done by aquadest solvent at temperature of 95 °C with shaking speed of 700 rpm for 30, 60, 90, 120, 150, and 180 minutes. Glucomannan precipitate was gained with anti-solvent isopropyl alcohol 95% with salak seed flour : anti-solvent ratio is 1:9, 1:11, 1:13, 1:15, and 1:17 (w/v). Then research using Completely Randomized Design (CRD) at the level of 95%. The results showed the best extraction time was obtained at shaking time of 120 minutes with yield of  21.47% and the best ratio of salak seed flour : isopropyl alcohol is 1: 17 (w/v) with yield of 40.19%. Characteristics of glucomannan is a water content of 11.18%, ash content of 1.2%, and the molecular weight 2.057 x 104 g/mol.Keywords : salak seed flour, shaking time, glucomannan.
Analisis Termodinamika dan Kinetika Nanopartikel Karbon (C-Dot) dari Buah Durian Sebagai Inhibitor Korosi Tembaga: Thermodynamics and Kinetics Analysis of Carbon-Dots from Durian as Copper Corrosion Inhibitor Faradisa Anindita; Noviyan Darmawan; Zainal Alim Mas'ud
KOVALEN: Jurnal Riset Kimia Vol. 7 No. 3 (2021): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2021.v7.i3.15608

Abstract

Corrosion is a physical interaction between the metal and its environment, which results in changes in the metal's properties due to chemical or electrochemical reactions. The corrosion rate can be reduced by adding a corrosion inhibitor. Uses of nanotechnology for corrosion prevention is one of the first technical because almost made structures rely on the stability of a 1–2 nm thick passive film which provides stability to the underlying material. Herein we report the thermodynamic and kinetic analysis of carbon-dots from Durian as inhibitor copper corrosion. To test the anticorrosive performance and analyze thermodynamic properties in its role as a corrosion inhibitor on copper using potentiodynamic polarization. The thermodynamic-kinetic parameters of corrosion obtained values of H‡ = 60.44 kJmol-1, ΔS‡ = -73.9 kJmol-1, and ΔG‡ = 82.83 kJmol-1, show that the attendance of C-dot as a corrosion inhibitor causes a non-spontaneous reaction rate to be proven by increasing spontaneity (ΔG‡). The value of activation energy samples was higher than the blank, indicates the presence of C-dot effective to reduce the rate of corrosion of the metal.
Co-Authors Agusriyadin, Agusriyadin Alif, Alfiah Andas, Netty Huzniati Andi Besse Patadjai Apriliya, Ella Arif Prasetya Awal, Samsi Dian Permana Disnawati Disnawati Disnawati Disnawati, Disnawati Fazira, Yuli Fitria Mukti, Elisa Gaby Nanda Kharisma Hairia, Warda Hasan Eldin Adimu Hasidu, La Ode Abdul Fajar Hasriani Said Ilham Antariksa Tasabaramo Inda, Inda Indriani, Windi Jaya Hardi Kamur, Sudarwin Karelius, Karelius Kedang, Yohana Ivana Kurniawan, Muhammad Akbar S. La Na’ani Laksono Trisnantoro Maharani Maharani Maharani Maharani Maharani Maharani, Maharani Mbuli, Firnayanti Megawati , Megawati Megawati - Megawati, Megawati mubarak, azhar aras Muh. Zulzayat Rapi Muhamad Jalil Baari Muhammad Syaiful Muis Muis Muis Na'ani, L.A. Na’ani, La Noviyan Darmawan Nurmira, Nurmira Patadjai, Andi Besse Ramad Arya Fitra Riska Riska Riska Riska Risnawati, Fina Salim Salim Sarimuddin, Sarimuddin Waangkaali Warni Wiana Widiawati Yeni Ilva Zainal Alim Mas'ud