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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 6 Documents
 1 
Search results for , issue "Vol 4 No 2 (2022): Oktober 2022" : 6 Documents clear
lebih Teknologi Membran Nanofiltrasi Terhadap Pengolahan Masalah Perairan: Review Syifa Aulia Permata Sari; Lesta Lesta; Syarmila Syarmila; Yunilita Hanum; Zulfa Mawaddah; Jurian Jurian; Nurhadini Nurhadini
Stannum : Jurnal Sains dan Terapan Kimia Vol 4 No 2 (2022): Oktober 2022
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v4i2.2936

Abstract

One of the most widely used membranes is the nanofiltration membrane, this membrane is formed from various nanomaterials, such as metal nanoparticles and metal oxides, carbon-based nanoparticles, metal organic frameworks, and micro or organic nanoparticles. Membrane separation processes are used to concentrate or fractionate liquids to produce two liquids with different compositions. This makes the nanofiltration process an alternative compared to conventional processes. The potential of nanofiltration membranes can be used in textile industry wastewater treatment, tofu liquid waste, tofu liquid waste treatment, batik wastewater testing, and groundwater management as drinking water. In addition, nanofiltration membrane technology can be used as a separator for a substance in the air, such as removal of cypermethrin, arsenic cream, concentration of lactic acid bacteria as a tasty probiotic, removal of carbosulfan, Zr-Hf separation, and can see the characterization and performance evaluation of the antifouling properties of membranes. . Based on the process, the performance of a membrane is determined by two simple factors, namely flux (permeate flow rate) and membrane selectivity.
Ekstrak Batang Pelawan (Tristaniopsis merguensis Griff.) sebagai Antibakteri pada Staphylococcus aureus dan Escherichia coli Genta Febri Kusuma; Robby Gus Mahardika; Fajar Indah Puspita Sari
Stannum : Jurnal Sains dan Terapan Kimia Vol 4 No 2 (2022): Oktober 2022
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v4i2.3063

Abstract

Currently, diseases caused by infection with pathogenic microorganisms are increasing, this is indicated by the increasing interest in antibacterial substances. This research was conducted on the stem of the pelawan plant (Tristaniopsis merguensis Griff.) with the aim of identifying the secondary metabolites contained in the extract of n-hexane, ethyl acetate, and methanol of the stem of pelawan which have the potential to have antibacterial activity. Determination of the profile of the compounds contained in the extract of pelawan stem using a qualitative phytochemical test. Antibacterial test using disc diffusion method. Phytochemical qualitative test showed positive results in the flavonoid and phenol groups. The results of the disc diffusion antibacterial test on the diameter of the inhibitory zone of the stem extract showed that the methanol extract of the stem against the S. aureus had the greatest inhibition against the bacteria S. aureus at a concentration of 10000 ppm with an average inhibitory power of 8.07 mm and against the bacteria E. coli at the concentration of 10000 ppm. concentration of 10000 ppm with an average inhibition of 8.19 mm.
Uji Total Fenolik dan Aktivitas Antioksidan Ekstrak Batang Bajakah (Spatholobus littoralis Hassk.) Sari Wulan; Occa Roanisca; Nurhadini Nurhadini
Stannum : Jurnal Sains dan Terapan Kimia Vol 4 No 2 (2022): Oktober 2022
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v4i2.3265

Abstract

Diseases in the human body can be caused by free radicals. Environmental conditions and unhealthy lifestyles cause the human body's defense system against free radicals to become weaker, so it is necessary to have external antioxidants to help ward off free radicals. Therefore, it is necessary to have natural antioxidants from plants in overcoming free radicals. This study aims to determine the levels of phenolic contained in the ethanol extract of bajakah stems and their potential bioactivity as antioxidant. Determination of phenolic content was carried out using the Folin-Ciocalteau method and antioxidant testing was carried out using the DPPH method. The total phenolic test results obtained were 21.535 mg EAG/g. The antioxidant test of the ethanol extract of the bajakah stem showed weak activity with an average IC50 value of 281,717 g/mL.
The Effectiveness of Pandan Sea (Pandanus Tectorius) Cellulose Active Charcoal in Reducing BOD, COD, TSS Level’s in Liquid Waste Tapioca Dianti Aviliani; Fajar Indah Puspita Sari; Robby Gus Mahardika
Stannum : Jurnal Sains dan Terapan Kimia Vol 4 No 2 (2022): Oktober 2022
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v4i2.3326

Abstract

Tapioca liquid waste contains high organic substances and suspended solids. This research utilizes the cellulose activated charcoal of sea pandan leaves to adsorb the organic matter content and suspended solids. This study aims to determine the lignin and cellulose content of pandan sea leaves before and after delignification, determine characteristics, determine the optimum mass and optimum efficiency of tapioca wastewater adsorption. Analysis of lignin and cellulose content refers to the Chesson method with a decrease in lignin content of 11.5% to 5.4% as cellulose content increases from 65.1% to 83.6%. The results of the characteristics of water content 11.6% and ash content of 4.2%, GSA analysis showed a surface area of ​​12.6495 m2/g, a total pore volume of 0.0124607 cm3/g which included micropores and an average pore radius of 1.97015 nm. Characterization using FTIR showed cellulose functional groups such as O-H, C-H, CH2, C-O and lignin functional groups, namely aromatic CH. Adsorption was carried out with a mass variation of 1, 5 and 10 grams in 250 ml of tapioca liquid waste for 30 minutes. /L to 5.40 mg/L, TSS 875 mg/L to 9.03 mg/L and optimum efficiency at 10 gram mass with removal of COD 99.64%, BOD 99.81%, TSS 98.94%. The adsorption of cellulose activated charcoal from sea pandan leaves is superior to using microorganisms in tapioca wastewater at PT Sinar Batu Rusa Prima. Further modification is needed in the application of activated charcoal in the waste to produce a colorless filtrate.
Potensi Kandungan Antioksidan dari Daun Rhizophora apiculata Mangrove Khas Lempasing, Pesisir Lampung Selatan Muhammad Yogi Saputra; Muhammad Raffi Zakaria; Debora Silalahi; Welldone Sartika; Hamdiyah Fuola Zeri Hasibuan; Rahmat Kurniawan; Arif Azhari; Sena Maulana; Syaikhul Aziz; Sukrasno Sukrasno
Stannum : Jurnal Sains dan Terapan Kimia Vol 4 No 2 (2022): Oktober 2022
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v4i2.3631

Abstract

The mangrove woodland is a distinct bush or brine habitat characterized by a coastal sedimentation environment in which fine sediment (often rich in organic matter) accumulates in areas protected from high energy waves. Mangrove forests thrive on the coasts of tropical and subtropical regions, including Indonesia. Mangrove forest is a complex ecosystem that has a high diversity of plants, microorganisms, and animals. One of them is the Oil Mangrove (R. apiculata) which grows well on the coast of Lampung. This plant is hard, rich in tannins, and dense, mainly used to make charcoal and firewood. This plant traditionally used to treat diarrhea and nausea. Mangrove plants are tolerant to high salt levels, this special trait is due to the presence of secondary metabolites produced in response to various environmental stresses. Flavonoid compounds, alkaloids, terpenoids and steroids are secondary metabolites produced by mangrove plants. Secondary metabolite compounds from mangroves have bioactivity such as antidiabetic, antimicrobial, antioxidant and anticancer. Exploration of secondary metabolites from mangroves, especially oil mangroves locally named as Bakau Minyak, which are widely grown in the Lempasing area, coastal Lampung for the development of medicinal compounds, has not been intensely reported. This investigation aims to study the potential phytochemicals profile of R. apiculata’s leaf as an antioxidant
Pemanfaatan Biji Nangka dan Biji Kedelai sebagai Bahan Baku Pembuatan Tepung Nila Tanyela Berghuis; Ujang Ahmad Soleh; Zulfikar Fauzan Ali; Tuti Purnama Elia; Yeni Novita Sari; Meidiana Budiawati; Rika Febriyanti Hermana; Miftah Khoirunnisa; Syifa Fadlillah
Stannum : Jurnal Sains dan Terapan Kimia Vol 4 No 2 (2022): Oktober 2022
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v4i2.3632

Abstract

The accumulation of plastic waste and excessive use of plastic is a common environmental issue in Indonesia. Plastics are synthetic polymers that are stable, water-resistant, light, flexible, and strong, but are very difficult to be broken down by microorganisms. Decomposition of plastic waste by burning can cause other environmental issues and during the combustion process can produce dioxin compounds that are harmful to health. An available and affordable alternative to reduce the use of plastic is by using bioplastics. Bioplastics are plastics made from natural materials that can be broken down by microorganisms, so they are more environmentally friendly than commercial plastics. Generally, the main ingredients of making bioplastics are starch or chitosan. The source of starch used in this project comes from cassava peel waste. In this project, researchers also utilize waste from chicken egg-shells. The function of adding eggshell waste is to give biodegradable plastic hard characteristics. The ratio between cassava peel and egg shell used was 1:0, 1:1, 1:3, and 1:5. With a 1:1 ratio is the most optimal. the addition of egg shells with the right ratio (1:1) made the ability of biodegradation of bioplastics to increase. The results of the Tensile Strength Test of Bioplastic Samples with a ratio of 1:0, 1:1, 1:3 and 1:5 are 9.2 x10-3 kgf/cm2, 4.4 x10-3 kgf/cm2, 2 x10-3 kgf/cm2 and 2 x10 -3 kgf/cm2.

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