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Robby Gus Mahardika
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Gedung Dharma Pengabdian, Department of Chemistry, Faculty of Engineering, Kampus Tepadu Universitas Bangka Belitung Balunijuk, Kab. Bangka, Prov. Kep. Bangka Belitung
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Stannum : Jurnal Sains dan Terapan Kimia
Published by Universitas Bangka Belitung
ISSN : 2714674X     EISSN : 27148173     DOI : https://doi.org/10.33019/jstk
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering
Jurnal Sains dan Terapan Kimia published research article, minireview/review, and short communication that included studies in Inorganic Chemistry, Organic Chemistry, Analitycal Chemistry, Biochemistry, Physical Chemistry, Computational Chemistry, Chemical Engineering, and Applied Chemistry.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 53 Documents
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Uncertainty Estimation of the Fe Content Measurement in the Clean Water Using UV- Vis Spectrophotometer Adi Syahputra
Stannum : Jurnal Sains dan Terapan Kimia Vol 1 No 1 (2019): Oktober
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (496.11 KB) | DOI: 10.33019/jstk.v1i1.1141

Abstract

Good laboratories should be able to apply procedures uncertainty for measuring of both conventional and instrument equipment. As well as the testing for Fe content using UV-Vis Spectrophotometer. As for the purpose for calculating the uncertainty estimated to determine the range of values within which estimated the true value of the testing standard solution Fe using UV-Vis Spectrophotometer. The uncertainty estimation are influenced by several factors such as sample used, reading of spectrophotometer, repeatability, sample volume. The uncertainty of the calculation obtained a value of ± 0,02 mg/L. Further testing of Fe content in the clean water using UV-Vis Spectrophotometer at the 500 nm wavelength which forms an orange solution as indication of Fe content in the water. The result of Fe content has quality standards according to the spesifications issued by ministry of health Republic of Indonesia in 2010 for drinking water.
Function Groups Analysis of Wood-Plastic Composite with Plasctic Waste and Pelawan’s Wood Sawdust (Tristaniopsis merguensis) Ristika Oktavia Asriza; Diah Humaira; Sri Hawa T Insan; Zomi Zomi
Stannum : Jurnal Sains dan Terapan Kimia Vol 1 No 1 (2019): Oktober
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (531.935 KB) | DOI: 10.33019/jstk.v1i1.1179

Abstract

One of the efforts in tackling the increasingly large amount of plastic waste is to synthesize composite material from plastic waste with Pelawan’s wood sawdust (Tristaniopsis merguensis) as a raw material for the uphold of pepper plants. Pelawan is one of the endemic plants in the Bangka Belitung Islands Province. The characteristic observed in this study is the functional group of plastic waste composites with Pelawan’s wood sawdust, which was obtained from FTIR analysis. The method used in this study is to mix plastic waste and wood dust against contraper with variation ratio (wt / wt). The results of this FTIR show that there is an effect of the ratio of the amount of plastic waste and wood dust against the intensity of IR absorption. Based on IR data, the presence of absorption peak of FTIR spectrum at wave number 3327 cm-1 and widening of absorption in the region of wave number 3000-3550 cm-1 indicates the presence of O-H functional groups. The absorption band of the O-H vibrations is due to the presence of water molecules found in cellulose contained in the Pelawan’s wood sawdust. The absorption peak at wave number 1737 cm-1 indicates the existence of strain vibrations from the functional group C=O. While the absorption peak at wave number 1300-1000 cm-1 indicates the existence of stretch vibration from C-O. Therefore, the absorption tapes indicate the presence of cellulose originating from Pelawan’s wood sawdust which has been bound to plastic.
The Adsorption Efficiency of Lead From Post-Tin Mining Water using Nanomagnetic Fe3O4/Chitosan Portunus pelagicus shells Verry Andre Fabiani; Eva Julianti; Ary Samsiar; Ristika Oktavia Asriza
Stannum : Jurnal Sains dan Terapan Kimia Vol 1 No 1 (2019): Oktober
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (595.342 KB) | DOI: 10.33019/jstk.v1i1.1271

Abstract

Adsorption was carried out on the water of post tin mining using nanomagnetic Fe3O4/chitosan from Portunus pelagicus shells. Nanomagnetic Fe3O4/Chitosan was prepared for lead adsorption. The nanomagnetic Fe3O4 was characterized through XRD and chitosan was characterized through FTIR The concentration of Pb in post tin mining water is 0,36 ppm. This study varied the mass of Fe3O4 and stirring time. The adsorption results were analyzed by AAS and obtained the largest adsorption efficiency (58,33%) at stirring 30 minutes with a mass of Fe3O4 of 75 mg.
Total Phenolic and Antioxidant Capacity of Acetone Extract of Tristaniopsis merguensis Leaves Occa Roanisca; Robby Gus Mahardika; Fajar Indah Puspita Sari
Stannum : Jurnal Sains dan Terapan Kimia Vol 1 No 1 (2019): Oktober
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (565.637 KB) | DOI: 10.33019/jstk.v1i1.1274

Abstract

The purpose of this study was to determine the total phenolic and antioxidant capacity of Tristaniopsis merguensis leaf acetone extract. In this study extraction using the maceration method for 3 days with a ratio of dry leaves and solvents of 1: 10 (w / v). Analysis of total polyphenols in this study was carried out using the Follin-Ciocalteu method. Total polyphenols were measured based on gallic acid standards. The antioxidant capacity is calculated based on the DPPH method. The results of this study, obtained extract yield of 9.34%. The total phenolic content of the Tristaniopsis merguensis leaf acetone extract was 215.22 mg GAE / g DW. While the antioxidant capacity of the acetone extract has an IC50 value of 22,1454 µg / mL.
Antioxidant Activity Test for Rukam Fruit (Flacourtia rukam) Of Maseration Extract Inas Fadiyah; Iin Lestari; Shelly Victory
Stannum : Jurnal Sains dan Terapan Kimia Vol 1 No 1 (2019): Oktober
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (535.569 KB) | DOI: 10.33019/jstk.v1i1.1417

Abstract

Rukam fruit (Flacourtia rukam) is one of the wild plants that are widely distributed in Indonesia, especially on the island of Bangka. The results of previous studies stated that rukam fruit has a phenolic content of 40 mg GAE / 100 grams. Phenolic compounds have major benefits as antioxidants, where antioxidants have the ability to inhibit the work of free radicals. Therefore a study was conducted to assess the content of secondary metabolites and the antioxidant bioactivity of the Flacourtia rukam species using maceration method. Rukam fruit extract was obtained using the Maceration method. As for the antioxidant test using the DPPH` method. The results of the antioxidant activity test of rukam extract with ethanol solvent obtained IC50 value 236,169 µg / mL and in rukam extract with acetone solvent obtained IC50 276,443 µg / mL which showed that the antioxidant properties of this rukam were moderate.
Isolation of Essential Oils from Essential Roots (Vetiveria zizanoides L.) with Preparation Using Liquid Nitrogen Arif Ashari; Ciptati Ciptati
Stannum : Jurnal Sains dan Terapan Kimia Vol 1 No 1 (2019): Oktober
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (533.967 KB) | DOI: 10.33019/jstk.v1i1.1418

Abstract

Fragrant root oil production can be done by various methods including distillation, pressing, extraction using solvents and extraction using solid fat. Efforts to increase the production of quality fragrant root oil before the extraction process carried out 2 treatments on the sample, namely chopping and preparation using liquid nitrogen. Research that has been carried out sample preparation using N2 (l) has proven to be effective in increasing oil yield. In fresh samples, the yield of oil obtained from the steam-hydro distillation method is 0.84% (variation 1) and 1.2% (variation 2) while for the socletation method is 1% (variation 1) and 2.4% ( variation 2). From the results of GC-MS analysis, the fragrant root oil of the dry sample was identified as composed of 68 components and there were 2 components that were suspected as oil fingerprints namely khusimene (4.44%) and nootkatone (2.02%)
The Gel Soap with Raw Materials of Lerak Fruit (Sapindus rarak DC) Fitria Wijayanti; Mayang Sari; Roni Suprayitno; Dian Aminin
Stannum : Jurnal Sains dan Terapan Kimia Vol 2 No 1 (2020): April
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v2i1.1618

Abstract

Lerak (sapindus rarak DC) is one of the plants that is often used as a noble metal washer, facial cleanser as a remover for acne and as an insecticide, especially earthworms. In this study the manufacture of soap gel by using Lerak plants. Lerak fruit (Sapindus rarak DC) is one of the natural ingredients that can be used as an alternative in soap raw materials. Lerak fruit (S. rarak) contains several secondary metabolites. The most dominant secondary metabolite is saponin. These saponins act as raw material for making soap. The purpose of this study is the use of natural materials, especially Lerak fruit as raw material for gel soap Tests conducted on soap are foam test, soap quality with experiments on several stains and organoleptic soap tests. The results obtained Lerak fruit can be used as raw materials for soap. The foam test results on the soap found that the soap foaming durability was longer. The results of soap quality testing on several stains namely charcoal stains, soy sauce stains and sauces prove the soap can clean stains well. The organoleptic results get a distinctive aroma, odor, and average of density are 1.01.
A review of the development of Polymerase Chain Reaction technique and its uses in Scientific field Lucyenne Angeline Giri Putra; Christianus Jodi Yonathan; Nabila Imania Niedhatrata; Mochammad Hilmy Rizka Firdaus; Jessica Renata Yoewono
Stannum : Jurnal Sains dan Terapan Kimia Vol 2 No 1 (2020): April
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v2i1.1619

Abstract

PCR (Polymerase Chain Reaction) is a scientific term and technique in molecular biology which able to generate copies of a specific DNA from two short oligodeoxynucleotide sequences (also called primers) by a polymerase-dependent repetitive thermal reaction. PCR technique brought a revolution in science especially in molecular biology since its first discovery back in 1984 as its simplicity and not a time-consuming trait. Over the past decades, PCR techniques have been modified to make it suitable for the application in each scientific field. PCR nowadays is involved in almost all studies that required DNA fragments manipulation including in food and medical analysis. By taking advantage of this revolutionary technique and if developed and used well, it would become very beneficial for humanity in many aspects
Impregnasi Ekstrak Bunga Kiacret (Spathodea campanulata) Menggunakan Kaolin Pulau Bangka Nurhadini Nurhadini; Ristika Oktavia Asriza; Ken Ayu; Anggraeni Anggraeni; Karnelasatri Karnelasatri
Stannum : Jurnal Sains dan Terapan Kimia Vol 2 No 1 (2020): April
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v2i1.1649

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh impregnasi kaolin Pulau Bangka terhadap serapan terhadap ekstrak bunga kiacret dengan pelarut n-heksana. Impregnasi kaolin-ekstrak bunga kiacret dengan pelarut n-heksana ianalisis menggunakan FTIR dan Spektrofotometri UV-Vis. Berdasarkan analisis FTIR terjadi pergeseran bilangan gelombang pada 780 cm-1 ke 718 cm-1. Selain itu adanya pergeseran bilangan gelombang ekstrak bunga kiacret dari 1063 cm-1 ke 1044 cm-1 pada ekstrak bunga-kaolin teraktivasi. Spektra UV-Vis menunjukkan bahwa penambahan kaolin (variasi 2 gram) menyebabkan daerah serapan ekstrak kiacret n-heksana mengalami pelebaran hingga 404 cm.
Synthesis of CuO-based Nanofluids Mediated by White Egg for Ethanol Distillation Applications Aliefia Noor; Evi J; Aisyah D.A.T. Safitri; Rifqi A. Rafsanjani; Yuant Tiandho
Stannum : Jurnal Sains dan Terapan Kimia Vol 2 No 1 (2020): April
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v2i1.1701

Abstract

The use of solar energy to satisfy renewable energy in Indonesia has great potential. To improve the efficiency of solar collectors, some researchers proposed solar collectors that equipped by nanofluids as working fluids. CuO-based nanofluids are known as nanofluids that have excellent conductivity. The purpose of this study is to synthesise CuO nanofluids through egg white mediation methods, and it will be applied to simple distillation systems. Generally, the synthesising process is arranged based on the modification of the sol-gel method, and by the calcination, it will leave metal oxides, namely CuO-nanoparticles. The calcination temperature variation used is 150℃; 300℃; 500℃ and 700℃. According to Debye-Scherrer equations, it is known that, in optimal condition, we obtain CuO crystallite by the size is 42 nm. The use of CuO nanofluids can increase the conductivity of fluids and can increase the effectiveness of ethanol distillation by 81%.

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