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All Journal Paduraksa : Jurnal Teknik Sipil Universitas Warmadewa Alchemy : Journal of Chemistry Jurnal Harpodon Borneo Biotropika Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) Jurnal Pengabdian Kepada Masyarakat Universitas Bangka Belitung Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat Elkawnie EduChemia: Jurnal Kimia dan Pendidikan Chimica et Natura Acta Acta Pharmaciae Indonesia : Acta Pharm Indo Indonesian Journal of Pure and Applied Chemistry Chemistry Indonesian Journal of Chemical Research Martabe : Jurnal Pengabdian Kepada Masyarakat Jurnal GEOSAPTA Fullerene Journal of Chemistry ALKIMIA : Jurnal Ilmu Kimia dan Terapan Stannum : Jurnal Sains dan Terapan Kimia ASEAN Journal of Chemical Engineering Jurnal Abdi: Media Pengabdian Kepada Masyarakat EKOTONIA: Jurnal Penelitian Biologi, Botani, Zoologi dan Mikrobiologi Jurnal Sains dan Edukasi Sains Jurnal Pijar MIPA Asian Journal of Health and Applied Sciences Indonesian Journal of Community Empowerment Dharma Pengabdian Perguruan Tinggi (DEPATI) Jurnal Pengabdian Pada Masyarakat Journal of Pharmascience

Robby Gus Mahardika

Departement Of Chemistry, Faculty Of Engineering, Universitas Bangka Belitung Jl. Kampus Peradaban, Merawang, Bangka, 33172

Author-ID : 312021

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IDENTIFIKASI KEBERADAAN LOGAM TANAH JARANG (LTJ) PADA TAILING TIMAH MENGGUNAKAN ALAT XRF PORTABLE DAN XRF MAX/PORTRACE-KECAMATAN MERAWANG Guskarnali Guskarnali; Benget Harmoko Manik; Robby Gus Mahardika; Boy Dian Anugrah Sandy
Geosapta Vol 6, No 2 (2020): Juli 2020
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jg.v6i2.7934

Penelitian ini dilakukan di Kecamatan Merawang, Kabupaten Bangka dengan sampel pasir hasil tailing timah sebagai bahan uji dalam mengaplikasikan penerapan dua instrument (alat) yaitu alat X-Ray Fluorescence (XRF) Portable dan X-Ray Fluorescence (XRF) Max/Portrace dalam mengetahui unsur mineral logam tanah jarang. Metode penelitian diawali dengan pencucian sampel pasir untuk menghilangkan kotoran yang menempel di butiran pasir lalu dilakukan pengeringan, pengecilan ukuran butir dari sampel pasir dengan Hardgrove Grindability Index (HGI) dan kemudian dilakukan pengayakan menggunakan Sieve Shaker dengan ukuran 60,80,120,200 dan –200 mesh. Analisis yang digunakan untuk mengidetifikasi keberadaan logam tanha jarang menggunakan sampel pasir under size (-200mesh). Hasil pengujian dari kedua alat tersebut dapat mengidentikasi unsur mineral sebanyak 44 mineral untuk X-Ray Fluorescence (XRF) Max/Portrace sedangkan alat X-Ray Fluorescence (XRF) Portable sebanyak 11 unsur mineral. Berdasarkan pengujian sampel pasir pada alat XRF Portable dan XRF Max/Portrace menunjukkan unsur mineral Sn teridentifikasi lebih banyak terutama pada SP-2 sebesar 3200 ppm. Uji XRF Max/Portrace lebih dominan mendeteksi mineral Sn sedangkan pada unsur mineral Ti lebih dominan teridentifikasi pada alat XRF Portable terutama pada sampel SP-2 sebesar 865 ppm. Penggunaan XRF Portable lebih efektif jika digunakan untuk mengidentifikasi awal keberadaan kandungan Sn yang terdapat pada sampel pasir. Kata-kata kunci: Tailing timah, XRF, logam tanah jarang

EKSTRAKSI DAUN PELAWAN (Tristaniopsis merguensis)SEBAGAI ANTIOKSIDAN MENGGUNAKAN MICROWAVE ASSISTED EXTRACTION (MAE) Sito Enggiwanto; Fusfita Istiqomah; Kasro Daniati; Occa Roanisca; Robby Gus Mahardika
Indonesian Journal of Pure and Applied Chemistry Vol 1, No 2 (2018)
Publisher : Tanjungpura University

Indonesia is a country that produces a wealth of abundant biodiversity, one of which is a plant that is often cultivated the tree of Pelawan (Tristaniopsis merguensis). Pelawan trees are widely spread in Indonesia one of them found in the forests of the Bangka Belitung island. Therefore, this study aims to identify the secondary metabolites and testing antioxidants in leaf of pelawan extract by comparing methods of Microwave Assisted Extraction (MAE) with maceration method. The resistant leaf used in this study was obtained from Sempan, Bangka Belitung. The observation result shows that the use of MAE method can extract with faster time compared with maceration method. So the MAE method is more effective than the maceration method. The using of MAE method for 30 minutes obtained the highest yield percentage of 41.3% in ethanol solvent which is more effective than acetone solvent. Extraction by using 48 hour maceration yields is 28.985%. While the extraction with 30 minute maceration is 13.385%. Testing of antioxidant activity using Microwave Assisted Extraction (MAE) method on acetone solvent has the highest antioxidant activity than ethanol extract that is 9,501 μg/mL. The use of the MAE method is more efficient in extracting the leaves of Pelawan than the maceration method when viewed from the time and antioxidant activity.

PENINGKATAN KUALITAS MINYAK JELANTA MENGGUNAKAN KARBON AKTIF DAN EKSTRAK PUCUK IDAT (Cratoxylum glaucum) Robby Gus Mahardika; Sito Enggiwanto; Ary Samsiar
Indonesian Journal of Pure and Applied Chemistry Vol 1, No 1 (2018)
Publisher : Tanjungpura University

Silica Waste cooking oil can be used as a soap or biodiesel. Good soaps or biodiesel should be from oils that have low levels of fatty acids and free radicals. However, waste cooking oil has high free fatty acid and free radical, it is necessary to increase the quality of waste cooking oil. One effort to improve the quality of waste cooking oil can use activated carbon as an adsorbent. Decrease in free radicals in cooking oil can use antioxidants from extract pucuk idat (Cratoxylum glaucum). This study aims to see the effect of extract pucuk idat on the process of improving the quality of waste cooking oil. The process of improvement by adding activated carbon and varying the concentration of ethanol extract pucuk idat. Activated carbon used 10% with variation of extract 0,25%; 0,5% and 0,75%. This process followed by stirring for 15 minutes at 80°C, then soaked for 3 days. Oil quality are identified by the method of determining the levels of free fatty acids and acid numbers. The results of this study indicate that extract pucuk idat in ethanol with 0,75% concentration has the lowest free fatty acid and acid number. Extract pucuk idat can improve the quality of waste cooking oil.

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

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.

Nanoemulsi Fraksi Daun Pelawan (Tristaniopsis merguensis Griff) Sebagai Antidiabetes Ary Samsiar; Robby Gus Mahardika; Occa Roanisca
Stannum : Jurnal Sains dan Terapan Kimia Vol 3 No 2 (2021): Oktober 2021
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v3i2.2290

Diabetes mellitus is an increased level of sugar in the blood and the secretion of glucose in the urine due to metabolic disorders of insulin secretion. Efforts to treat diabetes mellitus can be done with therapy and drugs, but this can cause side effects. Diabetes can also be treated using herbal ingredients from nature. This study aims to determine the potential of pelawan leaves as an antidiabetic in the form of nanoemulsion.The pelawan leaves were extracted with acetone, then partitioned using MeOH solvent: water, again partitioned with ethyl acetate, then partitioned with n-hexane solvent. The nanoemulsion was prepared using a homogenizer at a stirring speed of 8000 rpm for 30 minutes with a composition of 2.5 ml VCO, 10 ml tween 80 and 37.5 ml water. Nanoemulsion from the MeOH: water and ethyl acetate fraction had better characteristics than the n-hexane fraction nanoemulsion. MeOH fraction nanoemulsion: water has a particle size of 123.8 nm, while ethyl acetate has a particle size of 153.9 nm. Meanwhile, the n-hexane nanoemulsion preparation had the characteristics of a larger particle size, namely 361 nm, and had a polydispersity index of 0.625 nm. The antidiabetic test using ethyl acetate fraction can inhibit α-glucosidase by 1.075% at a concentration of 2.5 mg / ml.

Microwave-Assisted Extraction of Polyphenol Content from Leaves of Tristaniopsis merguensis Griff. Robby Gus Mahardika; Occa Roanisca
ASEAN Journal of Chemical Engineering Vol 19, No 2 (2019)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Tristaniopsis merguensis Griff. is a species of the Myrtaceae family and has been widely used by people of Bangka Belitung as a traditional medicine to reduce cholesterol, gastric pains, and improve cardiac performance. Extraction methods are the crucial efficacy of herbal medicine. The conventional method, like maceration, takes a long time. In this study, the leaves of Tristaniopsis merguensis were extracted using Microwave-Assisted Extraction (MAE) to reduce extraction time. The extraction using MARS (Microwave Accelerated Reaction System) 6 by CEM Corporation with time variation times of 5, 10, 15, 30 min with temperature of 60, 80, 100oC at 1200 W. The yield using acetone extraction of Tristaniopsis merguensis leaves increases with time and temperature. The extraction dependent on solvent extraction, polar solvent like ethanol, and methanol were higher than semi-polar solvents like acetone and ethyl acetate. The polyphenol content of acetone extract using MAE (10 min, 80oC) was found to be 234.67 mg Gallic Acid Equivalent per gram (GAE/g); it was higher than acetone extract using maceration. The phytochemical results show there are no difference in the active compound using MAE and maceration, i.e. alkaloids, tannin, and flavonoids. Yield extraction, time, and phytochemical results of MAE are more favorable than a maceration.

PENINGKATAN KUALITAS AIR MINUM MELALUI METODE PENYARINGAN BERTINGKAT BERBASIS LIMBAH KULIT TELUR DI DESA TERU KABUPATEN BANGKA TENGAH Ristika Oktavia Asriza; Janiar Pitulima; Verry Andrei Fabiani; Robby Gus Mahardika
Jurnal ABDI: Media Pengabdian Kepada Masyarakat Vol. 4 No. 1 (2018)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ja.v4n1.p27-31

In accordance Regulation Minister of Health Republic of Indonesia No. 492 / MENKES / PER / IV / 2010 about Quality Requirements of Water Drink, the acidity (pH) of water drink about 6.5 - 8. Based on situation analysis, Teru Village of Central Bangka Regency is below the standard, which about 4.1. The low pH of water drink in Teru village cause negative effect for health. So, an effort to improve the quality of water drink is needed. Through IbM Devotion of Society was created by filtration tool on eggshell-based waste in Teru Village, Central Bangka Regency. By utilizing an egg shell waste containing calcium carbonate, it is expected to increase the pH of the water. Based on the results of trials in the field, the results obtained that there was an increase in the pH of water drink to 6.91, which is in accordance with drinking water quality standard.

Education of the People of Srimenanti Village Through Print and Social Media During The COVID-19 Pandemic Adisyahputra Adisyahputra; Robby Gus Mahardika
Indonesian Journal of Community Empowerment (IJCE) Vol 1 No 02 (2020): Indonesian Journal of Community Empowerment (November)
Publisher : Fakultas Kewirausahaan Universitas Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35899/ijce.v1i02.183

The spread of the corona virus is increasingly widespread in several areas of Indonesia including the province of the Bangka Belitung Islands. One area that is very strategic and often traversed by people that may be exposed to the spread of the corona virus is Srimenanti Village, Bangka Regency. Therefore, community service activities were carried out in Srimenanti Village which aims to educate the public about COVID-19 through social media and printed media. This activity is assisted by the team of Real Work Lectures (KKN) Universitas Bangka Belitung 2020. Education is carried out using printed media in the form of posters and banners as well as virtual media in the form of videos which are distributed to the people of Srimenanti Village and distributed through social media. The result of this activity is an increase in public understanding and awareness regarding the prevention and handling of COVID-19.

Sintesis Senyawa Vanilil Metil Keton dan Uji Aktivitas Antiinflamasi terhadap Enzim COX-1 dan COX-2 melalui Analisis In Silico Khoirotul Ummah; Robby Gus Mahardika; Ana Mardliyah
ALCHEMY:Journal of Chemistry Vol 8, No 2 (2020): ALCHEMY: Journal of Chemistry
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/al.v8i2.10863

This study reports the synthesis of vanillyl methyl ketone from eugenol through Wacker oxidation and anti-inflammatory activity test toward COX-1 and COX-2 through in silico analysis. Wacker oxidation process was catalyzed by PdCl2 and CuCl2 using DMF solvent under the aerobic condition at room temperature for 48 hours. The product of the synthesis was purified by column chromatography and was characterized by NMR, IR, and MS spectroscopy. Characterization by spectroscopic methods showed that vanillyl methyl ketone was formed with a yield of 45% and vanillin (3%) was produced as a by-product. The anti-inflammatory activity of vanillyl methyl ketone was carried out by molecular docking toward COX-1 and COX-2 obtained from PDB. The analysis showed that the anti-inflammatory activity and selectivity toward COX-2 of vanillyl methyl ketone was higher than eugenol. This was shown by the low binding energy affinity and the number of hydrogen bonds formed between the vanillyl methyl ketone and the active site of the enzyme. Keywords: eugenol, Wacker, vanillyl methyl ketone, antiinflammatory, in silico Pada penelitian ini dilakukan sintesis senyawa vanilil metil keton dari eugenol melalui oksidasi Wacker serta dilakukan uji aktivitas antiinflamasi terhadap enzim COX-1 dan COX-2 melalui analisis in silico. Proses oksidasi Wacker dikatalisis oleh PdCl2 dan CuCl2 menggunakan pelarut DMF dalam kondisi aerob pada suhu ruang selama 48 jam. Senyawa hasil sintesis dipisahkan menggunakan kolom kromatografi dan dikarakterisasi menggunakan spektroskopi NMR, IR dan MS. Hasil karakterisasi menunjukkan bahwa senyawa vanilil metil keton telah terbentuk dengan randemen sebanyak 45% dan juga dihasilkan senyawa vanillin (3%) sebagai produk samping. Aktivitas antiinflamasi senyawa vanilil metil keton dilakukan dengan docking molekuler terhadap enzim COX-1 dan COX-2 yang diperoleh dari PDB. Hasil analisis menunjukkan bahwa aktivitas antiinflamasi dan selektivitas terhadap COX-2 pada senyawa vanilil metil keton lebih tinggi dibandingkan eugenol. Hal ini ditunjukkan melalui rendahnya afinitas energi pengikatan dan banyaknya ikatan hidrogen yang terbentuk antara vanilil metil keton dengan sisi aktif enzim. Kata kunci : eugenol, Wacker, vanilil metil keton, antiinflamasi, in silico

Pengaruh Salinitas terhadap Kepadatan Populasi dan Konsentrasi Klorofil-a Spirulina pada Media Kultur Modifikasi Walne dan Air Limbah Budidaya Ikan Anggraeni Anggraeni; Eva Utami; Robby Gus Mahardika
EKOTONIA: Jurnal Penelitian Biologi, Botani, Zoologi, dan Mikrobiologi Vol 7 No 2 (2022): Ekotonia: Jurnal Penelitian Biologi, Botani, Zoologi dan Mikrobiologi
Publisher : Department of Biology, Faculty of Agriculture, Fisheries and Biology, University of Bangka Belitung

Spirulina merupakan mikroalga hijau kebiruan yang mengandung klorofil-a. Kandungan klorofil-a Spirulina sangat dipengaruhi oleh faktor lingkungan pada media kultur, salah satunya salinitas. Salinitas yang optimal dapat meningkatkan kadar pigmen klorofil-a, namun peningkatan kadar salinitas juga memberikan pengaruh negatif pada pertumbuhan Spirulina, karena dapat menghambat proses fotosintesis, respirasi dan penyerapan nutrisi. Tujuan penelitian ini yaitu untuk menganalisis peningkatan salinitas terhadap penyerapan nutrisi media kultur yang dilihat dari kepadatan sel dan konsentrasi klorofil-a. Penelitian dilakukan secara eksperimental laboratoris. Kadar salinitas yang digunakan pada penelitian ini yaitu 0, 10, 15, 20, 25, dan 30 ppt. Media kultur dimodifikasi dengan penambahan nutrisi walne dan air limbah budidaya ikan dengan perbandingan 1:1, dengan waktu kultur selama 20 hari. Hasil penelitian menunjukkan kepadatan sel tertinggi terdapat pada salinitas 30 ppt sebesar 0,635±0,091 dan terendah pada salinitas 0 ppt sebesar 0,293±0,037. Kepadatan sel tertinggi pada semua salinitas rata-rata terjadi pada hari ke-8 hingga ke-10. Konsentrasi klorofil-a tertinggi pada salinitas 10 ppt sebesar 107,153 mg/L dan terendah pada salinitas 25 ppt sebesar 19,684 mg/L. Pada kadar salinitas yang lebih tinggi menghasilkan konsentrasi klorofil-a yang lebih rendah. Berdasarkan penelitian disimpulkan bahwa peningkatan salinitas memberi pengaruh terhadap kepadatan populasi, namun tidak pada konsentrasi klorofil-a Spirulina.

Co-Authors Adisyahputra Adisyahputra Adisyahputra Adisyahputra Adisyahputra Adisyahputra Adisyahputra Adisyahputra, Adisyahputra Afrilia, Mega Ajeng Triane Syawila Amanah, Hairil Amelia, Ririn Ana Mardliyah Anggraeni Anggraeni Aprilia, Selvy Ary Samsiar Ary Samsiar Benget Harmoko Manik Boy Dian Anugra Sandy Boy Dian Anugra Sandy Delvia Safitri Dewi Septia Ningsih Dianti Aviliani Eva Utami Fadiyah, Inas Fajar Indah Puspita Sari Fajar Indah Puspita Sari Fajar Indah Puspita Sari Fitri Afriani Fusfita Istiqomah Genta Febri Kusuma Gita Afriza Guskarnali, Guskarnali Henri Henri Herman Aldila Ila Rosilawati Janiar Pitulima Kasro Daniati khairul fajri, khairul Khoirotul Ummah Khoirotul Ummah Lestari, Iin Lidya, Lidya Liska Liska, Liska Mariam Ulfah Maya Yusnita Megiyo Megiyo Nazrun Nazrun Nina Kadaritna Nosa Mayasani Novianti, Shindi Nur Hidayatiandri Nurhadini Nurhadini Putri, Faizah Alivia Rani Rani RANI RANI, RANI Ristika Oktavia Asriza Roanisca, Occa Sari, Ratih Puspita Selvy Aprilia Sembiring, Rinawati Shakila, Shania Shania Sakhila Sito Enggiwanto Sito Enggiwanto Stefan Marco Rumengan Surtina, Surtina Susanti Susanti Syarmila, Syarmila Utami, Sri Risky Verry Andre Fabiani Widia, Widia Widodo Budi Kurniawan Yopan Pratama Yulia Yulia Zulita, Zulita

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