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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 Pharmascience Chimica et Natura Acta Acta Pharmaciae Indonesia : Acta Pharm Indo Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 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

Robby Gus Mahardika

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

Author-ID : 312021

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Veterinary Other

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Fenolik Total Fraksi Etil Asetat Daun Pelawan (Tristaniopsis merguensis Grifft.) Robby Gus Mahardika; Occa Roanisca; Fajar Indah Puspita Sari
Jurnal Sains dan Edukasi Sains Vol 3 No 1 (2020): Jurnal Sains dan Edukasi Sains
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/juses.v3i1p8-14

Ekstrak aseton didapatkan dari daun Tristaniopsis merguensis Grifft menggunakan metode maserasi. Ekstrak aseton selanjutnya difraksinasi dengan metode partisi cair-cair dengan pelarut etil asetat. Penentuan kadar fenolik total dilakukan berdasarkan metode Follin-Ciocalteu dengan standar asam galat. Hasil penelitian ini menunjukkan bahwa fraksi etil asetat dari ekstrak aseton daun Tristaniopsis merguensis mengandung senyawa fenolik total 86,724 ± 1,83 mg GAE/g fraksi etil asetat kering. Berdasarkan spektrum FT-IR fraksi etil asetat ini mengandung senyawa yang memiliki gugus Ar-OH (fenolik), -OH (hidroksil), C=O (keton) dan C=C (aromatik). Gugus Ar-OH ini yang menandakan adanya senyawa fenolik pada fraksi etil asetat ekstrak aseton daun Tristaniopsis merguensis.

Potensi Stenochlaena palustris Burm. Sebagai Agen Antiinflamasi Berdasarkan Metode Ekstraksi PEF (Pulsed Electric Field): Sebuah Kajian Naratif Nazrun Nazrun; Nur Hidayatiandri; Susanti Susanti; Robby Gus Mahardika
Jurnal Sains dan Edukasi Sains Vol. 4 No. 2 (2021): Jurnal Sains dan Edukasi Sains
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/juses.v4i2p66-74

Penyakit tidak menular (Non Communicable Disease (NCD) masih mendominasi penyebab kematian secara global. Ada beberapa faktor yang menyebabkan masyarakat terjangkit NCD, salah satunya adalah lemahnya daya tahan tubuh akibat pola hidup masyarakat yang kurang sehat. Salah satu cara untuk meningkatkan daya tahan tubuh dari berbagai penyakit adalah adanya agen antiinflamasi khususnya dari bahan alam. Salah satunya adalah pucuk merah iding-iding (Stenochlaena palustris Burm.). Tanaman ini merupakan tanaman yang banyak tumbuh di Bangka Belitung yang dipercaya sebagai obat tradisional untuk pengobatan penyakit nyeri, bisul, penyakit kulit, dan penguat darah. Pemilihan metode ekstraksi yang tepat menjadi kunci kefektifan ekstraksi zat aktif dari bahan alam. Salah satu metode yang yang efektif adalah PEF (Pulsed Electric Field) yang memadukan metode non termal dengan penerapan medan listrik tegangan tinggi dalam waktu yang singkat. Di dalam artikel ini dilakukan kajian naratif terkai potensi antiinflamasi ekstrak pucuk merah iding iding (S. palustris Burm.) menggunakan metode ekstraksi PEF (Pulsed Electric Field). Berbagai kajian kandungan senyawa pucuk iding-iding dikomparasikan dengan senyawa-senyawa atau ekstrak aktif sebagai antiinflamasi. Selanjutnya, dalam artikel ini juga dipaparkan potensi penggunaan metode ekstraksi senyawa aktif menggunakan PEF. Hal ini dikarenakan metode PEF ini memiliki prospek yang menjanjikan mengingat waktu ekstraksi yang lebih singkat dan tidak memerlukan panas sehingga senyawa-senyawa aktif tidak mengalami degradasi. Selain itu dipaparkan juga prospek dari penggunaan PEF sebagai metode ekstraksi dalam industri herbal sehingga menjadi masukan untuk penelitian ke depan.

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

Sintesis Karbon Aktif Tempurung Ketapang (Terminalia catappa) Sebagai Adsorben Minyak Jelantah Megiyo Megiyo; Herman Aldila; Fitri Afriani; Robby Gus Mahardika; Sito Enggiwanto
Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2017: Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2017
Publisher : Universitas Sebelas Maret

Abstract: Activated carbon is the most common adsorbents used in regeneration of cooking oil process. Waste frying oil is a residual of frying that has been destructed due to repeated use. For reusable, it must through by oil regeneration process to eliminate impurities and free radicals. One of the abundant biomass and feasible to be activated carbon is ketapang shell. The synthesis of activated carbon used activator H2SO4 11% with ratio 1: 4 (w / v) followed by thermal activation at 650oC for 2 hours. Activated carbon is then mixed with waste frying oil with variations of 5%, 7.5% and 10% and is left for 24 hours. As an antioxidant to free radicals added extract iding-iding (Stenochlaena palustris) of 5%. Based on the observation data SEM pore distribution on activated charcoal fairly evenly with the average pore width around 10 mm. The results of acid number and free fatty acid test showed that the greater amount of activated carbon used, the value of acid number and free fatty acid content will decrease. The optimum condition was obtained on 10% active carbon and 5% extract with 0.8% acid value and 0.78% free fatty acid content. Abstrak: Karbon aktif merupakan salah satu adsorben yang umum digunakan dalam upaya peningkatan regenerasi minyak jelantah. Minyak jelantah merupakan limbah hasil sisa penggorengan yang telah terdestruksi akibat pemakaian yang berulang-ulang. Untuk dapat digunakan kembali minyak jelantah harus mengalami proses regenerasi minyak untuk menghilangkan impuritas dan radikal bebas. Salah satu biomassa yang begitu melimpah dan layak untuk dijadikan karbon aktif adalah tempurung ketapang. Sintesis karbon aktif tempurung ketapang dilakukan dengan menggunakan aktivator H2SO4 11% dengan perbandingan 1:4 (b/v) dilanjutkan dengan aktivasi termal pada temperatur 650oC selama 2 jam. Karbon aktif yang diperoleh kemudian dicampurkan dengan minyak jelantah dengan variasi 5%, 7,5% dan 10% dan dibiarkan selama 24 jam. Sebagai penangkal radikal bebas ditambahkan ekstrak iding-iding (Stenochlaena palustris) sebesar 5%. Berdasarkan hasil pengamatan data SEM sebaran pori pada arang aktif tempurung ketapang cukup merata dengan lebar pori rata-rata berkisar 10 mm. Hasil uji bilangan asam dan kadar asam lemak bebas menunjukkan bahwa semakin besar jumlah karbon aktif yang digunakan maka nilai bilangan asam dan kadar asam lemak bebas akan semakin menurun. Kondisi optimum diperoleh pada komposisi 10% karbon aktif dan 5% ekstrak iding-iding dengan nilai bilangan asam 0,8% dan kadar asam lemak bebas 0,78%.

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.

Co-Authors Adisyahputra Adisyahputra Adisyahputra Adisyahputra Adisyahputra Adisyahputra Adisyahputra Adisyahputra, Adisyahputra Afrilia, Mega Ajeng Triane Syawila Amanah, Hairil Amelia, Ririn Ana Mardliyah Anggraeni Anggraeni Ary Samsiar Ary Samsiar Benget Harmoko Manik 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 Henri 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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