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Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Kampus Universitas Andalas Limau Manih Padang 25163
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INDONESIA
Jurnal Riset Kimia
Published by Universitas Andalas
ISSN : 1978628X     EISSN : 24768960     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 551 Documents
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ANALISIS UJI INFUSA BUAH PETAI CINA, DAUN KEJI BELING DAN DAUN TEMPUYUNG SEBAGAI INHIBITOR ENZIM α-AMILASE DAN α-GLUKOSIDASE Silvera Devi Sy; Musyima Rahmah Nst; Riryn Novianty
Jurnal Riset Kimia Vol. 10 No. 1 (2019): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.314

Abstract

Enzim α-amilase dan α-glukosidase dalam proses pencernaan akan  menghidrolisis amilum menjadi glukosa dan apabila glukosa darah melebihi batas normal (>140 mg/dL), maka seseorang didiagnosa menderita diabetes melitus. Pengobatan diabetes melitus khususnya tipe 2 biasanya diatasi menggunakan obat akarbose yang akan menginhibisi aktivitas α-amilase dan α-glukosidase. Pada penelitian ini akan dianalisis kemampuan inhibisi infusa dari sampel segar dan kering buah petai cina (Leucaena leucocephala L de Wit), daun keji beling (Strobilanthes crispus BI) dan daun tempuyung (Sonchus arvensis L.) terhadap ke 2 enzim ini. % inhibisi infusa terhadap aktivitas enzim α-amilase ditentukan menggunakan metode asam 3,5-dinitrosalisilat (DNS) sedangkan untuk α-glukosidase menggunakan substrat p-nitrofenil-α-D-glukopiranosida (p-NPG). Absorbansi hasil reaksi diukur menggunakan microplate reader pada panjang gelombang 530 nm untuk α-amilase dan 410 nm untuk α-glukosidase. Hasil penelitian menunjukkan bahwa % inhibisi infusa sampel kering lebih baik dibandingkan sampel segar  dalam menghambat aktivitas enzim α-amilase dengan persentase sebagai berikut: infusa buah petai cina kering 92,54+1,11%, infusa daun keji beling kering 99,79+6,92% dan infusa daun tempuyung kering 87,63+3,95%, nilai ini tidak berbeda nyata dengan akarbose 93,89+ 0,02%. Sedangkan % inhibisi terhadap aktivitas enzim α-glukosidase dari semua sampel memiliki perbedaan yang nyata dengan akarbose (P<0,05) dengan nilai inhibisi 97,99+ 0,19%. Hasil ini menunjukkan bahwa ketiga tanaman tersebut berpotensi sebagai antidiabetes terutama dalam menginhibisi aktivitas enzim α-amilase.
Pengaruh Pemberian Variasi pH terhadap Produksi Trigliserida Total dan Komposisi Asam Lemak dari Chlorella Vulgaris Air Tawar Rahmadani Wulandari; Abdi Dharma; Syafrizayanti Syafrizayanti
Jurnal Riset Kimia Vol. 10 No. 2 (2019): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v10i2.316

Abstract

Chlorella vulgaris is a microalgae that has high lipid content and potential as raw material for biofuel production. This study aims are to determine the effect of pH on growth, lipid production and fatty acid composition of C. vulgaris by using Growmore 32-10-10 fertilizer as a culture medium. Microalgae were cultured in medium Growmore 32-10-10 for 10 days. Afterward, pH of medium was varied into pH 5, 7, 8.2 and 9 and continued cultivate for 3 days. C. vulgaris cultured at pH 8.2 which is a control pH reached optimum growths. The GC-MS analysis for lipid productivity of C. vulgaris was 0.5020 g/L/day and 0.2902 g/L/day for microalgae grew at pH 8.2 and 9, respectively. Cultures at pH 8.2 and 9 produce methyl hexadecanoate, methyl 9-octadecanoate, methyl octadecanoate, methyl 9,12-octadecadienoate, methyl 9,11-octadecadienoate. Additional fatty acid methyl nonadecanoate was also found in C. vulgaris grew at pH 9. The low and high pH stress of C. vulgaris culture medium did not affect culture growth but altered lipid production and fatty acid composition.
SINTESIS DAN KARAKTERISASI NUKLEOTIDA BERTANDA [α-32P]ATP Wira Yusril Rahman; Endang Sarmini; H. Herlina; A. Abidin; T. Triyanto; H. Hambali; Santi Nurbaiti
Jurnal Riset Kimia Vol. 10 No. 1 (2019): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.319

Abstract

The utilization of nuclear technology in health sector with molecular techniques is increasingly developed today, especially in Indonesia.  One of which is nucleotide compound marked with [α-32P]ATP, this compound has been used as tracer for deoxyribonucleic acid (DNA)/ ribonucleic acid (RNA) in the study of various physiological and pathological processes. [α-32P]ATP is synthesized through several stages of continuous reaction in one reaction vessel. It begins with synthesis of [γ-32P]ATP through an enzymatic reaction, using H332PO4 and ADP, and enzymes  of lactate dehydrogenase, 3-phosphoglycerate phosphokinase and glyceraldehide 3-phospho  dehydrogenase; followed by phosphorilation of 3’AMP with T4 polinucleotide kinase enzyme to produce 3’-[5’-32P]ATP. The result is hydrolyzed with nuclease P1 enzyme to produce [5’-32P]AMP. The unreacted [γ-32P] is degraded by the addition of hexokinase enzyme and glucose. At the final stage of the reaction, the [5’-32P]AMP is  phosphorilated using phosphoenol-piruvat, piruvat kinase, and myokinase to produce [α-32P]ATP. The test results show that the every stage of reaction is characterized using TLC method, PEI cellulose paper as stationary phase and KH3PO4 0,5 M pH 3,5 as mobile phase. At the end of reaction, the yield of [α-32P]ATP reaches 71,7%, at Rf = 0,2.
INHIBISI KOROSI BAJA RINGAN MENGGUNAKAN BAHAN ALAMI DALAM MEDIUM ASAM KLORIDA: Review Yeni Stiadi; Syukri Arief; Hermansyah Aziz; Mai Efdi; E. Emriadi
Jurnal Riset Kimia Vol. 10 No. 1 (2019): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.321

Abstract

The corrosion of steel and its alloys is an important problem in industry, especially in acidic environments. Mild steel is one of the important alloys of iron which has many industrial applications because of its excellent mechanical properties, but mild steel is susceptible to corrosion. Corrosion problems need to be a concern and must be handled properly. Hydrochloric acid is widely used for pickling, cleansing, decomposition and metal etching, on the other hand also contributes to corrosion of metal surfaces. Plant extracts investigated the properties, mechanisms of adsorption and efficiency of inhibition as environmentally friendly corrosion inhibitors for various steel materials in different acidic media. The efficiency of corrosion inhibition of steel from plant extracts analyzed ranged from 72-98% and generally as a mixed-type inhibitor. Most of the inhibitors are adsorbed on the steel surface through a physisorption mechanism.
ANALISIS SENYAWA BERBAHAYA PARFUM ISI ULANG YANG DIJUAL DI KOTA PADANG MENGGUNAKAN METODE KROMATROGRAFI GAS-SPEKTROMETRI MASSA Ridho Asra; R. Rusdi; Putut Arifin; N. Nessa
Jurnal Riset Kimia Vol. 10 No. 1 (2019): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.324

Abstract

Perfume is widely used by most of people in this world. The increasing demand of perfume has caused many producers cheating by adding dangerous compounds and also unregistered by the National Agency of Drug and Food Control Indonesia. The aim of this study is to analyze the dangerous compounds in unregistered perfumes sold in Pasar Raya Padang City by using gas chromatography-mass spectrometry (GC-MS) method. In this Study, samples (A, B, C, D and E) were collected and the value of specific weight and refractive index of the samples were analyzed. The results showed that five samples contained relatively similar chemical compounds. Twelve compounds were detected and seven of them were harmful to health in refill perfumes which were dipropylene glycol, linalool, lily aldehyde, benzenepentanol, dimethylbenzyl carbinyl acetate, dihydro methyl jasmonate, alpha hexyl cinnamic aldehyde, based on Material Safety Data Sheet (MSDS). Regular monitoring of chemicals used in the manufacture of perfumes which may cause health risks to users should be controlled by National Agency of Drug and Food Control Indonesia.
Penentuan Kadar Karbohidrat pada Biji Cempedak Hutan (Artocarpus champeden Lour.) dengan Metoda Tembaga-Iodometri Neri Fadjria; Zulfisa Zulfisa; Arfiandi Arfiandi; Indah Yolandari
Jurnal Riset Kimia Vol. 10 No. 2 (2019): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v10i2.327

Abstract

Forest Cempedak Seeds (Artocarpus champeden Lour.) Are types of seeds that are underutilized by humans. Forest Cempedak Seed Flour has nutritional content of carbohydrates, fats, and proteins that can be processed as ingredients for food. This study aims to determine the carbohydrate content of Forest Cempedak Seeds (Artocarpus champeden Lour.) Conducted by the Copper-Iodometric method using a luff schoorl reagent. From the research that has been carried out obtained levels of carbohydrates in Cempedak Seeds (Artocarpus champeden Lour.) of 38.016%. 
Perbandingan Efektivitas Dekolorisasi Fotokatalitik Metilen Biru dan Metil Jingga menggunakan Semikonduktor ZnO pada Variasi pH Annisa M. Dewi; Wahyu B. Widayatno; Yuly Kusumawati
Jurnal Riset Kimia Vol. 10 No. 2 (2019): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v10i2.328

Abstract

The comparison of photocatalytic decolorization of Methylene Blue and Methyl Orange using ZnO Semiconductor under UV-LED radiation has been studied at varied pH. ZnO have been synthesized using co-precipitation method. The Scanning Electron Microscopy (SEM) result showed that the synthesized ZnO has a hexagonal structure with the particle size range 0.125 to 0.5 µm. The BET isotherm characterization showed the synthesized ZnO has a specific surface area (SBET), mesoporous volume and micropore volume of 60.20 m2/g, 0.541 cm3/g and 0.02 cm3/g, respectively. The observation of the effect of pH to the photocatalytic activity showed that the highest removal percentage occurred at pH 9 with the value of 95.64% for methylene blue and occurred at pH 3 with the value of 6.236% for methyl orange. 
Kajian Kualitas Air Tanah Ditinjau dari Parameter pH, Nilai COD dan BOD pada Desa Teluk Nilap Kecamatan Kubu Babussalam Rokan Hilir Provinsi Riau Arief Yandra Putra; Putri Ade Rahma Yulia
Jurnal Riset Kimia Vol. 10 No. 2 (2019): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v10i2.337

Abstract

Based on a preliminary study that has been carried out, Teluk Nilap Village, Kubu Babussalam District, Rokan Hilir was affected by the disposal of waste from oil company. The waste partly seeps into the residents' water sources which are used for domestic activities. It was because the location of the water sources close to the location of the waste oil disposal. The sampling technique in this study used the observation point technique (pumping test). Sampling refers to the point of waste oil flow (upstream, middle, downstream) and dug well water taken randomly (random sampling). The results showed pH values ranged from 2.8 to 6.6; BOD values range from 0.42 to 141.1 mg / L; COD values range from 20 to 291 mg / L. Ground water quality at some point in Teluk Nilap Village exceeded quality standard limits allowed and included in heavy pollution category.
Validasi Metode MPM untuk Penentuan Kandungan Antioksidan dalam Sampel Herbal serta Perbandingannya dengan Metode PM, FRAP dan DPPH Yefrida Yefrida; Hamzar Suyani; Hermansyah Aziz; Mai Efdi
Jurnal Riset Kimia Vol. 11 No. 1 (2020): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v11i1.342

Abstract

The Modified Phenanthroline Method (MPM) has been validated for determination of antioxidant content in herb samples. Validation was done using Relative Standard Deviation (RSD) and percentage of recovery. The RSD and percentage of recovery for herb samples are 3.13% and 98.6%, respectively. Based on these values, MPM method is valid for determining antioxidant content in herb samples. T test shows no significant differences of antioxidant content using any of these methods, MPM, PM, FRAP or DPPH, at a 95% confidence level. MPM method shows a very strong correlation with PM and FRAP method.  While with DPPH and TPC shows is strong.
Struktur dan Sifat Dielektrik Senyawa Aurivillius CaBi3LaTi4O15 yang Disintesis dengan Teknik Hidrotermal Zulhadjri Zulhadjri; Firmanul Qadri Amir; Marsal Mahmud; Upita Septiani; Syukri Arief
Jurnal Riset Kimia Vol. 11 No. 1 (2020): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v11i1.343

Abstract

Synthesis of four-layer Aurivillius CaBi3LaTi4O15 has been successfully carried out by hydrothermal technique using NaOH 4 M as mineralizer. The reaction was carried out at 220 °C for 72 h. Crystal structure, morphology, and dielectric properties were analyzed in this study. X-ray diffraction confirmed that the single-phase product was successfully obtained. The refinement result shows the product has orthorhombic crystal structure with space group A21am. The morphology analyzed using SEM shows plate-like grains are observed, which is characteristic of Aurivillius phase. Dielectric curves show peaks at 585 °C which indicate ferroelectric transition temperature.

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