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All Journal Reaktor Jurnal Teknik Kimia USU Prosiding Semnastek Communications in Science and Technology Jurnal Teknik Kimia Indonesia Jurnal Teknik Kimia USU Makara Journal of Technology
Rita Arbianti
Chemical Engineering Department, Engineering Faculty, Universitas Indonesia, Kampus UI Depok 16424
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Performance Optimization of Microbial Fuel Cell (MFC) Using Lactobacillus bulgaricus Arbianti, Rita; Utami, Tania Surya; Hermansyah, Heri; Novitasari, Deni; Kristin, Ester; Trisnawati, Ira
Makara Journal of Technology Vol. 17, No. 1
Publisher : UI Scholars Hub

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Abstract

Electrical energy needs in Indonesia are expected to continue to rise. The use of petroleum as a source of energy still dominates, although oil reserves in Indonesia are increasingly being depleted. Therefore, there is a need to develop alternative sources of sustainable energy, such as microbial fuel cell (MFC). In this study, Lactobacillus bulgaricus was used as an electricity producer in a dual-chamber MFC reactor. We investigated the maximum electrical energy by varying the bacterial optical density (OD), the operational time of MFC, the reactor volume, the electrolyte solution, and the configuration of MFC reactor. In this study, the maximum electrical energy (201.8 mW/m2) was generated at an OD of 0.5 in an MFC reactor series using potassium permanganate as the electrolyte solution.
Improvement of Quality of Carica papaya L. with Clove Oil as Preservative in Edible Coating Technology Kusrini, Eny; Usman, Anwar; Wisakanti, Chrispine Deksita; Arbianti, Rita; Nasution, Dedy Alharis
Makara Journal of Technology Vol. 19, No. 3
Publisher : UI Scholars Hub

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Abstract

We have studied utilization of essential clove oil, extracted from clove buds by hydrodistillation, as preservative in edible packaging technology. Preservative of essential clove oil was applied on chopped papaya fruits by using two methods, namely spray and brush. The effects of concentration of clove oil from 0.05 to 0.20% on the preservation of papaya fruits (Carica papaya L.) at room temperature (25 °C) were also evaluated. Physicochemical and in vitro microbiological activities on the papaya fruits that were stored at 25 oC and 85-90% relative humidity were investigated in details. The results indicate that the clove oil at concentration ≥0.10% suppressed the decay time, 10% weight loss, 0.03 g citric acid/100 g in acidity titration test, and 20% pH value from those of control sample of papaya fruits kept in a storage. The population of fungi and bacteria were efficiently reduced by 90% when the clove oil at concentration ≥0.10% was applied as preservative on papaya fruits. This finding suggested that the extracted essential clove oil acted as effective antifungal and antibacterial agents. Preservative by essential clove oil improved the quality of fruits to extend the product shelf life and to reduce the risk of microbial growth on fruits surface.
Ekstraksi Daun Kejibeling (Strobilanthes crispus) dengan Metode Continuous Ultrasound-Assisted Enzymatic Extraction: Pengaruh Temperatur dan Konsentrasi Enzim Randi Sitorus; Tania Surya Utami; Yuswan Muharam; Rita Arbianti; Naufal Azrizal Prasetyo
Jurnal Teknik Kimia USU Vol. 13 No. 2 (2024): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v13i2.17151

Abstract

Continuous ultrasound-assisted enzymatic extraction (CUAEE) method has become a promising technique for extracting bioactive compounds from plant materials. In this study, the extraction of kejibeling (Strobilanthes crispus) leaves was carried out using the CUAEE method to optimize the extract yield. The experimental design involved extraction parameters including leaf particle size (d ≤0,177 mm), ethanol concentration (50%), extraction time (180 minutes), and varying parameters such as temperature (30 °C, 40 °C, 50 °C, and 60 °C), as well as cellulase enzyme concentration of 3% and 5%. The results showed that the optimal conditions for CUAEE were achieved at a temperature of 60 °C with an enzyme-solid ratio of 5%, producing a total phenolic content (TPC) of 12,097 mg EAG/g dry leaf powder and a total flavonoid content (TFC) of 2,291 EK/g dry leaf powder. The data obtained indicate that the continuous ultrasound-assisted enzymatic extraction method has the potential for large-scale production of phenolic acids and flavonoids.
Ekstraksi Daun Kejibeling (Strobilanthes crispus) dengan Metode Continuous Ultrasound-Assisted Enzymatic Extraction: Pengaruh Temperatur dan Konsentrasi Enzim Randi Sitorus; Tania Surya Utami; Yuswan Muharam; Rita Arbianti; Naufal Azrizal Prasetyo
Jurnal Teknik Kimia USU Vol. 13 No. 2 (2024): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v13i2.17151

Abstract

Continuous ultrasound-assisted enzymatic extraction (CUAEE) method has become a promising technique for extracting bioactive compounds from plant materials. In this study, the extraction of kejibeling (Strobilanthes crispus) leaves was carried out using the CUAEE method to optimize the extract yield. The experimental design involved extraction parameters including leaf particle size (d ≤0,177 mm), ethanol concentration (50%), extraction time (180 minutes), and varying parameters such as temperature (30 °C, 40 °C, 50 °C, and 60 °C), as well as cellulase enzyme concentration of 3% and 5%. The results showed that the optimal conditions for CUAEE were achieved at a temperature of 60 °C with an enzyme-solid ratio of 5%, producing a total phenolic content (TPC) of 12,097 mg EAG/g dry leaf powder and a total flavonoid content (TFC) of 2,291 EK/g dry leaf powder. The data obtained indicate that the continuous ultrasound-assisted enzymatic extraction method has the potential for large-scale production of phenolic acids and flavonoids.
Combined enzymatic and ultrasound-assisted aqueous two-phase extraction of antidiabetic flavonoid compounds from Strobilanthes crispus leaves Arbianti, Rita; Angelina; Suryapranata, Bryan; Purwati Latifah, Linatri; Fadilah Putri, Najah; Surya Utami, Tania; Muharam, Yuswan; Slamet
Communications in Science and Technology Vol 8 No 2 (2023)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.8.2.2023.1214

Abstract

A novel green extraction method combining enzymatic and ultrasound-assisted aqueous two-phase extractions was employed to enhance and purify the flavonoid extract from Strobilanthes crispus leaves. Cellulase was used in the pretreatment, and ethanol-(NH4)2SO4 was selected as the solvent. A concentration of 7% (w/w) cellulase and a duration of 2 h were the optimal conditions for pretreatment. The optimal conditions for ultrasound-assisted aqueous two-phase extraction were 33% (w/w) ethanol and 14% (w/w) (NH4)2SO4 as they produced a yield (77.81%), partition coefficient (31.17), extraction efficiency (98.04%), and a high total flavonoid content (0.3666 mg QE/g dry leaf powder). Six compounds from the leaf extract were identified through liquid chromatography-mass spectrometry/mass spectrometry-quadrupole-time of flight (LCMS/MS-Q-TOF) analysis. The crude extract and three compounds in it (kaempferol, graveobioside A, and genistein) showed an antidiabetic activity with IC50 values of 390.35, 201.87, 292.73, and 431.82 mg/mL, respectively. These values are comparable to the standard drug acarbose.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Azis Adinda Putri Wisman, Adinda Aida R. Pudjiastuti Anandho Wijanarko Angelina Annisa Kurnia, Annisa Anondho Wijanarko Anondho Wijanarko Anwar Usman, Anwar Astri Nugroho Astri Nugroho Beta Nadia Manaf, Beta Chrispine Deksita Wisakanti, Chrispine Deksita Daryanto Daryanto Dedy Alharis Nasution, Dedy Alharis Deni Novitasari Deni Novitasari, Deni Desti Andani Dianursanti Diki Firdaus, Diki Eki Listya Rini Eny Kusrini Ester Kristin Ester Kristin, Ester Fadilah Putri, Najah Guruh Mehra Mulyana Hanung Adi Nugroho Heri Hermansyah Ira Setiawati Ira Trisnawati Ira Trisnawati, Ira Kitakawa, Naomi Shibasaki Luh Putu Ratna Sundari M Mariana Maemonah, Maemonah Misri Gozan Mohammad Nasikin Momoji Kubo Momoji Kubo, Momoji Naomi Shibasaki-Kitakawa Naomi Shibasaki-Kitakawa, Naomi Nathania Dwi Karina Naufal Azrizal Prasetyo Ng Sha Shiong Praswasti P. D.K Wulan Praswasti P. D.K Wulan, Praswasti P. D.K Purwati Latifah, Linatri Randi Sitorus Roekmijati W. Soemantojo Roekmijati W. Soemantojo, Roekmijati W. Septian Marno Slamet Slamet . Slamet Slamet Sri Amini Suryapranata, Bryan Tania S Utami Tania Surya Utami Tania Utami Tania Utami, Tania Toshiy Yonemoto Toshiy Yonemoto, Toshiy Vifki Leondo Wijanarko, A. Wiwik Handayani Yoki Yulizar Yosmarina Harahap Yuliusman Yuliusman Yuswan Muharam