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Budhi Oktavia
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Jurnal Periodic Jurusan Kimia UNP
Published by Universitas Negeri Padang
ISSN : -     EISSN : 23391197     DOI : https://doi.org/10.24036/p.v11i2.113715
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
Periodic adalah jurnal nasional yang berisi artikel-artikel bidang ilmu kimia, seperti bidang Kimia Analitik, Kimia Fisika, Kimia Anorganik, Kimia Organik dan Biokimia. Jurnal ini mempublikasikan hasil penelitian original, komunikasi singkat, dan artikel review. Artikel yang telah diterbitkan dalam jurnal ini berarti bahwa kegiatan penelitian yang diterbitkan adalah belum, dan tidak akan diterbitkan di tempat lain. Periodic (e-ISSN 2339-1197) diterbitkan oleh Jurusan Kimia dan mulai tahun 2022 disebut Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Padang, Indonesia. Periodic terbit berdasarkan berdasarkan surat edaran Direktorat Jenderal Pendidikan Tinggi No. 152/E/T/2012 tentang publikasi karya tulis ilmiah dan terbit sejak Oktober 2012.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 15 Documents
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Search results for , issue "Vol 1, No 2 (2012)" : 15 Documents clear
Analisis Kadar Asam Askorbat dan Asam Benzoat dalam Minuman Ringan dengan HPLC Menggunakan Fasa Gerak Metanol dan Buffer Asetat Rani Sanjaya; Budhi Oktavia; Bahrizal Bahrizal
Jurnal Periodic Jurusan Kimia UNP Vol 1, No 2 (2012)
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (232.473 KB) | DOI: 10.24036/p.v1i2.2523

Abstract

Penelitian ini bertujuan untuk menentukan kondisi optimum untuk pemisahan dan penentuan kadar asam askorbat dan asam benzoat yang berperan sebagai pengawet dalam minuman ringan yang beredar di pasaran dan di lingkungan sekolah dengan menggunakan HPLC. Hasil penelitian menunjukkan bahwa kondisi optimum HPLC yang menggunakan fasa gerak metanol dan buffer asetat berada pada laju alir 1 ml/mnt, Kolom ODS C18, λ= 240 nm, pH buffer 3.5, dilakukan secara elusi gradien yang dimulai pada komposisi fasa gerak 5:95 hingga 50:50 selama 5 menit. Dari hasil uji kadar sampel minuman ringan yang dijual di lingkungan sekolah tidak ditemukan asam askorbat dan asam benzoat sebagai bahan pengawet, sedangkan untuk minuman ringan yang beredar di pasaran dari 5 sampel yang diuji ditemukan sampel yang mengandung asam benzoat yang melebihi batas maksimum yang diizinkan yang terdapat pada sampel C yaitu 676 ppm, sedangkan kadar yang diizinkan menurut SNI 01-0222-1995 untuk asam benzoat adalah 600 ppm, sedangkan untuk kandungan asam askorbat terbanyak terdapat pada sampel A yaitu 2869 ppm.
Uji Antimikroba Asap Cair Hasil Pirolisis Sabut Pinang (Areca Catechu L) Terhadap Pertumbuhan Aspergillus flavus dan Rhizopus stoloniferus Dewi Ayu Novita; Iswendi Iswendi; Iryani Iryani
Jurnal Periodic Jurusan Kimia UNP Vol 1, No 2 (2012)
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (195.733 KB) | DOI: 10.24036/p.v1i2.2514

Abstract

Aspergillus flavus and Rhizopus stoloniferus are microbes that can cause damage to the food. The existence of these microbes in food can cause illness in humans and animals. One of the efforts made to inhibit the growth of microbes in food is the use of preservatives. Preservatives are being developed right now is the use of organic preservatives that use liquid smoke. Liquid smoke is the smoke of the liquid condensate from the pyrolysis of materials containing cellulose, hemicellulose and lignin such as coco nut. From the pyrolysis of the resulting compounds such as phenol and derivatives, organic acids and carbonyl compounds, which can act as an antimicrobial. This study aims to determine the effect of different concentrations of liquid smoke areca husk pyrolysis results on the growth of microbes that cause food decay, Aspergillus flavus and Rhizopus stoloniferus. This research was conducted at the Laboratory of Chemistry State University of  Padang  with this type of research is experimental. Testing was conducted using paper disc method. Design research is done completely randomized design (RAL) with liquid smoke concentration variation factor. The results showed that the concentration difference factor gives a different effect on the ability of liquid smoke as a result of pyrolysis coco nut antifungal. Highest zone of inhibition at a concentration of 25% (v / v) for Aspergillus flavus is 12 mm, while for Rhizopus stoloniferus is equal to 10 mm.
Pengaruh Penggunaan Sumber Silika Alumina Terhadap Karakteristik Semen yang Dihasilkan Mawardi Mawardi; Rianti Sihaloho; Bahrizal Bahrizal
Jurnal Periodic Jurusan Kimia UNP Vol 1, No 2 (2012)
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (222.489 KB) | DOI: 10.24036/p.v1i2.2519

Abstract

A study concerning about the effect using of source silica alumina that shape napa land from Solok Selatan to characterization of cement produce. In this study can learning the effect using napa land to particle size of cement with tested the waste on sifter, not soluble, lose glowing, press force and composition chemichal of cement with XRF based variety composition is 0%, 5% dan 9.5% from total number of cement. Then the results are particle size, not soluble part and lose glowing of cement that produces increase as a increase using of napa land. However, not be valid on press force in 3, 7 and 28 days tested produce decrease. It caused the particle size of cement is increase as a increase of napa land composition. The largest using is 9.5% of total number of cement can be fill SNI standard 15-7064-2004.
Karakterisasi dan Uji Toksisitas Asap Cair dari Sabut Pinang (Areca catechu L) Resi Herawati; Iryani Iryani; Usman Bakar
Jurnal Periodic Jurusan Kimia UNP Vol 1, No 2 (2012)
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (270.587 KB) | DOI: 10.24036/p.v1i2.2524

Abstract

It has researched about the characteristics and toxicity test liquid of liquid smoke from   fibrous shell of areca nut (Areca catechu L). The purpose of this research is to find the compoundscontained in liquid smoke from fibrous shell of areca nut and the dosage of liquid smoke which gives effect of toxic. This research is begun with producing liquid smoke at pirolisis temperature 300oC. Liquid smoke produced is decantated, defiltrated and dedestilated at 100-105oC. Each liquid smoke is characterized by using GC-MS. Furthermore, the toxicity of the liquid smoke destilated is tested to the animal test at dosage 50,500,5000 and 15.000 mg/kg of the body weight and as a control without giving liquid smoke. Observation is done during 14 days to mortality of mice and the mice which are still alive will be weighed its weight. Based on the result, it is found that the components structured the liquid smoke. It consists of fenol, carbonil, and carboksilate acid. From toxicity test, liquid smoke obtained at the great dosage; 15.000 mg/kg body weight of mice is not toxic and giving liquid smoke declines the the body weight of mice.
Analisis Kandungan Besi (Fe) dan Nikel (Ni) dalam Bijih Mangan di Daerah Taming Tonga Kabupaten Pasaman Barat secara Spektrofotometri Serapan Atom Dony Yulvi; Amrin Amrin; Edi Nasra
Jurnal Periodic Jurusan Kimia UNP Vol 1, No 2 (2012)
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (320.627 KB) | DOI: 10.24036/p.v1i2.2515

Abstract

Telah dilakukan penelitian tentang analisis kandungan besi dan nikel dalam bijih mangan yang tedapat di daerah taming tonga secara spektrofotometri serapan atom. Penelitian ini bertujuan untuk menentukan kandungan besi (Fe) dan nikel (Ni) dengan variasi pelarut, variasi ukuran partikel secara spektrofotometri serapan atom. Penelitian ini menggunakan metoda destruksi basah, dimana proses pendestruksian dilakukan dengan beberapa variasi yaitu variasi pelarut : HCl pekat, HNO3 pekat, dan HCl-HNO3 pekat (3:1), variasi ukuran partikel yaitu ≤ 63 µm, > 63 - ≤ 75 µm, dan > 75 - ≤ 90 µm. Hasil Penelitian ini menunjukkan kadar besi tertinggi didapatkan dengan menggunakan pelarut Aquaregia yaitu 10,402 % dengan ukuran partikel ≤ 63 µm sedangkan kadar nikel tertinggi didapatkan dengan menggunakan pelarut HNO3 yaitu 0,504 % dengan ukuran partikel terbaik ≤ 63 µm.

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