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KONVERSI AMPAS TEBU MENJADI BIOCHAR DAN KARBON AKTIF UNTUK PENYISIHAN Cr(VI) Pratama, Borneo Satria; Aldriana, Putri; Ismuyanto, Bambang; Hidayati, A.S Dwi Saptati Nur
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 2 No. 1 (2018)
Publisher : Fakultas Teknik, Universitas Brawijaya

Ampas tebu merupakan residu hasil penggilingan tanaman tebu setelah diambil niranya. Ampas tebu dapat dioptimalkan nilai guna dan fungsinya sebagai teknologi alternatif, yakni sebagai bahan pembuatan karbon aktif yang dapat digunakan sebagai adsorben untuk menghilangkan Cr(VI). Penelitian ini bertujuan untuk mengetahui pengaruh suhu karbonisasi terhadap karakteristik biochar ampas tebu serta adanya aktivasi dengan KOH. Karbonisasi dilakukan pada suhu 400, 450, 500, 550 dan 600°C di dalam reaktor fixed-bed dengan mengalirkan gas nitrogen (N2) dengan aliran konstan selama 2 jam. Karbon aktif dihasilkan melalui proses aktivasi biochar hasil karbonisasi suhu 600°C dengan metode perendaman menggunakan larutan kalium hidroksida (KOH) 4 M pada suhu ruang selama 24 jam. Karakteristik yang didapatkan menunjukkan bahwa semakin tinggi temperatur karbonisasi dapat menghasilkan luas permukaan biochar lebih besar dengan kandungan abu yang semakintinggi. Proses aktivasi pada biochar 600°C menggunakan KOH dapat menghasilkan karbon aktif dengan luas permukaan yang sangat besar, yaitu 1259,048 m2 /g disertai dengan penurunan kadar abu. Luas permukaan adsorben yang semakin besar dapat berpengaruh pada peningkatan kemampuan penyisihan Cr(VI) dari dalam larutan.

Decision Making on The Organoleptic Quality of Salted Egg Products using Analytical Hierarchy Process and Simple Additive Weighting Muliawati, Tri Hadiah; Yunanto, Andhik Ampuh; Pratama, Borneo Satria; Nugraha, Aditya Wahyu; Subara, Deni; Afifah, Amalia; Sariati, Sariati
Techno.Com Vol. 23 No. 3 (2024): Agustus 2024
Publisher : LPPM Universitas Dian Nuswantoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62411/tc.v23i3.11038

Chicken and duck eggs are highly nutritious food products that are popular among the Indonesian community. However, their perishable nature leads to a decline in quality if not further processed. The salting process is a simple preservation method that can also enhance the flavor of salted egg products. To produce salted egg products with high organoleptic quality preference, a combination of Analytical Hierarchy Process (AHP) and Simple Additive Weighting (SAW) is implemented as a quality decision-making method based on: (1) the experts viewpoints on the importance level of organoleptic criteria, and (2) the scores of organoleptic tests for the criteria of texture, taste, and appearance. In this study, chicken and duck eggs were processed into salted eggs using a salting mixture made of a blend of scouring ash and table salt with a mass ratio of 5:4 and 5:6, resulting in product combinations coded as CE-5/4, CE-5/6, DE-5/4, and DE-5/6. Data processing results on the importance level from the experts viewpoints using the AHP method resulted that the criteria for texture, taste, and aroma had final priority weights of 0.244, 0.617, and 0.139, respectively. Final decision-making using the SAW method indicated that the highest to lowest final preference scores were obtained by products CE-5/4, DE-5/4, DE-5/6, and CE-5/6, with the final preference scores of 0.979, 0.963, 0.931, and 0.906, respectively. The results demonstrated that AHP and SAW were successfully implemented to assist in making decisions regarding the quality of salted egg products based on their organoleptic characteristics. Keywords: salted egg, organoleptic, decision-making, AHP, SAW

SENSORY PREFERENCE DETERMINATION OF GREEN TEA EXTRACTS FROM UNCONTROLLED AND RELAY-CONTROLLED BREWING PROCESSES USING RANK ORDER CENTROID AND SIMPLE ADDITIVE WEIGHTING Pratama, Borneo Satria; Alfiqriyansyah, Alfiqriyansyah; S, Arya Dwicahya; Rukmana, Fitri Hardiyanti; Hartati, Intan Dwi; Cahya Brutu, Henrike Lehla; Winda, Winda; Sariati, Sariati
Machine : Jurnal Teknik Mesin Vol 10 No 2 (2024): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Sains dan Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jm.v10i2.5727

Green tea extract is a popular beverage known for its health benefits. To increase its market appeal, understanding the sensory profiles—taste, aroma, and color—of green tea extract is essential to ensure customer satisfaction. In this study, experiments were conducted to determine the optimal extraction conditions by varying extraction times (3 or 6 minutes) and temperatures (60°C, 80°C, or 100°C) in two brewing methods: (1) a relay-controlled brewing system utilizing Arduino, and (2) a standard brewing process without automated control. Sensory evaluations were conducted by 30 untrained panelists using a 9-point hedonic scale.. Decision-making methods, Rank Order Centroid (ROC) and Simple Additive Weighting (SAW), were then applied to identify the most preferred product. Results indicated that the highest taste score was achieved by the 80°C-6 min sample, while the best aroma and color scores were observed in the 100°C-3 min sample. Overall, the decision-making process using the combination of ROC and SAW methods concluded that the green tea extract from the 100°C-3 min sample was the most preferred by the panelists.

Characterization of Activated Carbon from Coffee Husk Using Potassium Hydroxide (KOH) as an Activator Putra , Tamam Athallah Rhely; Yunira, Eka Nur'azmi; Pratama, Borneo Satria; Witoyo, Jatmiko Eko; Pangestuti , Martasari Beti; Putra, Endo Pebri Dani; Nugraha, Aditya Wahyu; Devita, Wilda Harlia
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 1 (2025): April 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.01.01

Coffee husk is an agricultural by-product of coffee production, and its utilization is still limited. So, the study focuses on the potential of coffee husk to be turned into activated carbon. An essential step in producing activated carbon is activation, primarily performed using chemical solvents, such as potassium hydroxide (KOH). However, there are still limited studies on the effect of KOH concentration on the activation of charcoal from coffee husk. Therefore, the study aims to determine the impact of potassium hydroxide (KOH) concentrations on the characteristics of activated carbon derived from coffee husk. The KOH concentration ranges used to activate charcoal were 0 M (as control), 1 M, and 2 M, and were conducted using the completely randomized design (CRD) approach. The characteristics of the activated carbon were analyzed according to the SNI 06-3730-1995 standard, including moisture content, ash content, volatile matter content, and bonded carbon content. The results indicated that KOH concentration significantly impacted the characteristics of activated carbon derived from coffee husk.

Performa Adsorpsi Karbon Aktif dari Kulit Kopi untuk Menurunkan Asam Lemak Bebas (FFA) pada Minyak Jelantah Yunira, Eka Nur'azmi; Putra, Tamam Athallah Rhely; Pratama, Borneo Satria; Witoyo, Jatmiko Eko; Pangestuti, Martasari Beti
JURNAL AGROTEKNOSAINS Vol 9, No 1 (2025): Jurnal Agroteknosains
Publisher : Universitas Quality

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36764/ja.v9i1.1598

Coffee husk-activated carbon is a promising biomass for use as an adsorbent due to its composition and abundance. This study aimed to analyze the performance of coffee husk-activated carbon in reducing the free fatty acid (FFA) content of used palm cooking oil. The study examined the effects of potassium hydroxide (KOH) concentration, adsorption time, and the mass of activated carbon. The activated carbon was produced through carbonization at a temperature of 300–400, followed by activation using 0 M, 1 M, and 2 M of KOH solutions. The results showed that the reductions in FFA levels at various adsorption times (2, 4, and 6 hours) were 24.219%, 33.828%, and 46.016%, respectively. The longer the adsorption time, the greater the reduction in FFA levels. In mass variations (0.1, 0.3, and 0.5 g) for 100 ml of used palm cooking oil, the reductions in FFA levels for 0 M, 1 M, and 2 M KOH-activated carbon were 40.234%, 47.968%, and 50.781%, respectively. The study found that increasing adsorption time and the mass of coffee husk-activated carbon resulted in lower FFA levels in used palm cooking oil. The highest percentage reduction in FFA levels, 50.781%, was achieved using 2 M KOH-activated carbon with a mass of 0.5 grams using and 6 hours for adsorption time. These findings suggested that coffee husk-activated carbon was a viable and sustainable adsorbent for improving the quality of used palm cooking oil, potentially reducing its environmental impact and enhancing its reuse potential in various applications.

Formulation and Characterization of Herbal Solid Soap Enriched with Cinnamon (Cinnamomum burmanii) and Aloe vera Peel Extracts Narsih; Indrastuti, Y. Erning; Gunawan, Desdy Hendra; Saniah; Pratama, Borneo Satria
Indonesian Journal of Chemical Studies Vol. 4 No. 1 (2025): Indones. J. Chem. Stud., June 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i1.66

This study aims to develop a solid soap formulation using natural ingredients by combining cinnamon (Cinnamomum burmanii) extract and Aloe vera peel extract, which are known for their antibacterial, antioxidant, and moisturizing properties. The research involved several stages, including the extraction of cinnamon and Aloe vera, soap formulation with varying cinnamon and Aloe vera extract concentrations, and testing of physicochemical properties and antibacterial activity against Escherichia coli. The formulated soaps were evaluated for moisture content, free alkali levels, pH, foam stability, antibacterial inhibition zones, and skin irritation. The results showed that increasing the concentrations of cinnamon and Aloe vera peel extracts significantly affected the soap’s characteristics. The optimal formulation was obtained with 15% cinnamon extract and 6% Aloe vera peel extract (A3B3), yielding a moisture content of 2.44%, free alkali content of 1.70%, pH of 11.8, and an antibacterial inhibition zone of 1.28 mm, without any skin irritation. FTIR analysis identified functional groups such as aldehydes, alkanes, aromatics, and hydroxyls, which were associated with the bioactive compounds responsible for antibacterial and moisturizing effects. The presence of cinnamaldehyde in cinnamon and saponins in Aloe vera contributed to the soap’s enhanced antimicrobial and skin-conditioning properties. Furthermore, Fourier-transform infrared spectroscopy (FTIR) analysis identified key functional groups responsible for the soap’s bioactivity. These findings suggest that incorporating herbal extracts into soap formulations can improve their functional benefits, making them a promising alternative for natural skincare products with antibacterial protection and skin health benefits.

Effect of Lime (Citrus aurantifolia) Concentration and Stirring Time on the Quality of Palm Oil-Based Margarine N Narsih; Indrastuti, Y. Erning; Safitri, Sela; Pratama, Borneo Satria
Demeter: Journal of Farming and Agriculture Vol. 2 No. 2 (2024): July 2024
Publisher : CV. Media Digital Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58905/demeter.v2i2.406

This study aims to analyze the effects of lime (Citrus aurantifolia) concentration and stirring time on the quality of palm oil-based margarine. The treatments included lime concentrations of 1%, 2%, and 3%, with stirring times of 5 minutes and 10 minutes. The observed parameters included moisture content, fat content, free fatty acid levels, emulsion stability, spread ability, color, texture, aroma, and taste. Analysis of variance (ANOVA) results indicated that lime concentration and stirring time significantly influenced most margarine quality parameters. Increasing lime concentration and stirring time resulted in a rise in moisture content, ranging from 1.7249% to 3.1094%, and an increase in free fatty acid levels from 0.2543% to 0.4195%. Conversely, fat content decreased, ranging from 88.4387% to 81.3954%. Emulsion stability was within 99.6927%–99.8795%, while spread ability varied from 2.6335 g/mm² to 3.6473 g/mm². In terms of organoleptic properties, margarine color showed significant differences, with the highest value of 3.0000 (yellow) observed in the 3% lime concentration with a 5-minute stirring time, and the lowest value of 1.9524 (very yellow) found in the 2% lime concentration with a 10-minute stirring time. Margarine texture varied from firm to slightly firm, with the highest score of 2.6667 recorded for the 1% lime concentration with both 5- and 10-minute stirring times. Aroma intensity increased with higher lime concentrations, with the strongest aroma recorded at 2.9524 in the 3% lime treatment with a 5-minute stirring time. Meanwhile, taste remained mostly neutral, with the highest score of 3.3333 observed in the 2% lime concentration with a 10-minute stirring time. This study highlights that the appropriate combination of lime concentration and stirring time can produce margarine with improved quality characteristics

Implementasi ROC dan SAW untuk Pengambilan Keputusan Mutu Hedonik Seduhan Teh Herbal Rosella-Serai-Stevia dengan Kontrol Temperatur Relay Berbasis Arduino Sariati; Pratama, Borneo Satria; Afnita, Deviola Yuri Afnita; Pertiwi, Aulia Hana; Maulana, Rizka Syaiful; Lestianti, Khairunnisa Arika; Fahrezy, Fico Dika; Gaol, Merdiaty Lumban
Telekontran : Jurnal Ilmiah Telekomunikasi, Kendali dan Elektronika Terapan Vol. 13 No. 2 (2025): TELEKONTRAN vol 13 no 2 Oktober 2025
Publisher : Program Studi Teknik Elektro, Fakultas Teknik dan Ilmu Komputer, Universitas Komputer Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/telekontran.v13i2.17738

Abstrak - Penelitian ini bertujuan menentukan formulasi terbaik seduhan teh herbal berbahan dasar Rosella (Hibiscus sabdariffa), Serai (Cymbopogon citratus), dan Stevia (Stevia rebaudiana) melalui uji hedonik serta analisis menggunakan metode Rank Order Centroid (ROC) dan Simple Additive Weighting (SAW). Sistem kontrol temperatur berbasis mikrokontroler Arduino digunakan untuk menjaga suhu penyeduhan pada 70 °C dan 100 °C. Uji hedonik melibatkan 56 panelis non-terlatih generasi Z terhadap atribut rasa, aroma, dan warna. Hasil menunjukkan bahwa penambahan stevia meningkatkan kesukaan rasa, sedangkan penyeduhan pada 100 °C memperkuat warna tetapi menurunkan penerimaan rasa akibat meningkatnya keasaman. Aroma terbaik diperoleh pada formulasi dengan tambahan stevia pada suhu tinggi. Berdasarkan analisis ROC (rasa > aroma > warna) dan SAW, sampel D (4 g Rosella, 4 g Serai, 2 g Stevia, 100 °C) memiliki skor preferensi tertinggi sebesar 0,968. Dengan demikian, formulasi tersebut direkomendasikan sebagai seduhan teh herbal terbaik. Kata kunci : ROC, SAW, teh herbal, hedonik, rosella, serai, stevia, relay, arduino

Decision Making for The Most Outstanding Students Award using TOPSIS: a Case Study at Institut Teknologi Sumatera Pratama, Borneo Satria; Drantantiyas, Nike Dwi Grevika; Marvie, Ilham; Sembiring, Noveliska Br; Nadi, Muhammad Abi Berkah
Journal of Innovation Information Technology and Application (JINITA) Vol 5 No 2 (2023): JINITA, December 2023
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/jinita.v5i2.2114

The internal selection of Pemilihan Mahasiswa Berprestasi, or known as Pilmapres, is an annual competition held by Institut Teknologi Sumatera (ITERA) to award the most outstanding student of the year which will be further sent to compete in regional and national event of Pilmapres held by Balai Pengembangan Talenta Indonesia. This study aimed to implement TOPSIS as a decision-making tool to determine the winner of Pilmapres ITERA in 2023. The criteria used in this study were general achievements, English competencies, and creative ideas, with weight of 50, 20, and 30, respectively. The scores for the criteria for each of the students are obtained from nine members of the board of jury in the final stage of Pilmapres ITERA in 2023. The calculation result using TOPSIS concluded that the 1st, 2nd, and 3rd winners of the internal selection of Pilmapres ITERA in 2023 were Alpha, Beta, and Omega, with the final preference scores of 0.995, 0.799, and 0.795, respectively.

SENSORY PREFERENCE DETERMINATION OF GREEN TEA EXTRACTS FROM UNCONTROLLED AND RELAY-CONTROLLED BREWING PROCESSES USING RANK ORDER CENTROID AND SIMPLE ADDITIVE WEIGHTING Pratama, Borneo Satria; Alfiqriyansyah, Alfiqriyansyah; S, Arya Dwicahya; Rukmana, Fitri Hardiyanti; Hartati, Intan Dwi; Cahya Brutu, Henrike Lehla; Winda, Winda; Sariati, Sariati
Machine : Jurnal Teknik Mesin Vol 10 No 2 (2024): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Sains dan Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jm.v10i2.5727

Green tea extract is a popular beverage known for its health benefits. To increase its market appeal, understanding the sensory profiles—taste, aroma, and color—of green tea extract is essential to ensure customer satisfaction. In this study, experiments were conducted to determine the optimal extraction conditions by varying extraction times (3 or 6 minutes) and temperatures (60°C, 80°C, or 100°C) in two brewing methods: (1) a relay-controlled brewing system utilizing Arduino, and (2) a standard brewing process without automated control. Sensory evaluations were conducted by 30 untrained panelists using a 9-point hedonic scale.. Decision-making methods, Rank Order Centroid (ROC) and Simple Additive Weighting (SAW), were then applied to identify the most preferred product. Results indicated that the highest taste score was achieved by the 80°C-6 min sample, while the best aroma and color scores were observed in the 100°C-3 min sample. Overall, the decision-making process using the combination of ROC and SAW methods concluded that the green tea extract from the 100°C-3 min sample was the most preferred by the panelists.

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