Kinetic optimization of angkak – red ginger extraction and its impact on antioxidant activity

A mixture of angkak and red ginger is a Chinese herbal concoction with potential as an antioxidant. This herbal combination can be extracted using the kinetic hot maceration method by optimizing the stirring speed to be more efficient. Previous studies have shown that using 400, 600, and 800 rpm stirring speeds provides the best IC50 and yield. Based on these problems, this research aims to determine the effect of increasing stirring speed on IC50 and % yield in the extraction of angkak and red ginger, as well as prove the benefits of this herbal combination through the IC50 value. The method used is extracting a mixture of angkak and red ginger at kinetic variations of 400, 600, and 800 rpm using a magnetic hotplate stirrer at a temperature of 60ºC for 2 hours; determination of % yield; determining the chromatogram profile using TLC; determination of antioxidant activity using DPPH; as well as data analysis of percentage yield and IC50 using SPSS. Analysis using SPSS shows that the stirring speed significantly affects the % yield, where increasing the moving speed above 400 rpm results in a decrease in the % yield. However, the moving speed does not affect the IC50. The TLC chromatogram profile shows the presence of 6-gingerol compounds in angkak and red and yellow pigment compounds in red ginger, which have potential as antioxidants. The optimization results in this study obtained optimal % yield and IC50 at 400 rpm with average values, respectively, namely 15.933 ± 3.4771% and 103.76 ± 10.032 ppm, and the combination of angkak and red ginger ingredients can work synergistically to increase yield and antioxidant

EDITORIAL

Greetings to the Readers of Jurnal Teknosains!We are proud to present the latest edition of Jurnal Teknosains in Volume 13, Number 2, June 2024. In a world that is constantly evolving, innovation and sustainable development are crucial foundations for progress in the fields of technology and science. This edition takes us through a series of research articles that highlight various important aspects in this regard, ranging from the development of renewable energy technologies to efforts in addressing global pandemics. In broad strokes, we endeavor to provide an overview of the eight research articles in the field of technology and science published in this June 2024 edition

Impacts of temperature and coating pigment ratios on the corrosion rate of ss400 steel

Steel is the primary shipbuilding material; however, it erodes quickly. Adequate protection requires hard, durable, and adhesive coatings. This study examines how aluminium-graphite pigment and heat treatment affect epoxy-coated SS400 steel plate corrosion, adhesion, and coating resilience. This study used a 1:1 and 3:1 pigment ratio with 100°C and 150°C heat treatment. The coating layer was 250 μm thick and comprised 80% epoxy and 20% aluminum-graphite. The maximum adhesion strength, 19.62 MPa, was achieved with an aluminium-graphite pigment ratio of 1:1 and 100°C heat treatment. The top coating resistance was 6.86 Joules under identical conditions. The lowest corrosion rate, 0.047 mmpy, was at a 3:1 aluminum-graphite ratio and 150°C heat treatment. This discovery has significant consequences for shipbuilding steel corrosion resistance

Kinetic and combustion characteristics of oil palm empty fruit bunch biochar using thermogravimetric analysis

The usage of renewable energy is a mitigation phenomenon majorly impacting the power sectors, with biomass being one of the sources directly replacing coal in various applications. This leads to the portrayal of biomass having the potential to be a carbonaceous material, namely the Empty Fruit Bunch (EFB) of oil palm. To increase the characteristics of EFB, it can be converted into carbon-based products through thermochemical processes, such as hydrothermal carbonization. Therefore, this study aimed to compare the characteristics of feedstock and biochar EFB using the TGA method. The heating rate used in this study is 10 – 30°C/min at five °C/min intervals. The effect of heating rate on kinetic parameters and thermal (DTG, TGA) and combustion (T ignition, T burn out) characteristics was also determined. This study carried out the HTC process at temperatures of 210ᵒC and 230ᵒC. The results showed that biochar EFB had a higher ignition, burnout temperature, and activation energy than raw EFB. Ignition temperatures for EFB-HT210°C and EFB-HT230°C were 297°C and 298°C; burnout temperatures for EFB-HT210°C, EFB-HT230°C were 407°C and 450°C; and the activation energy for EFB-HT210°C, EFB-HT230°C were 58.84 kJ/mol and 62.16 kJ/mol. Besides the characteristics of biomass, the heating rate also affects combustion. This proved that increased heating rate caused higher ignition and burnout temperature and decreased activation energy. The results also indicated that the difference in heating rate influenced the peak temperature in DTG

Integrated microcontroller mq sensors for monitoring biogas: Advancements in methane and hydrogen sulfide detection

Recent technological advances in microcontroller systems enable novel biogas monitoring capabilities. This study investigates microcontroller-based quantification of methane and hydrogen sulfide concentrations in biogas derived from anaerobic digestion. Anaerobic digesters were fed either 100% cow dung substrates or a 50:50 mixture of cow dung with municipal solid waste (MSW). Methane levels were monitored using an MQ-4 sensor, hydrogen sulfide via an MQ-136 sensor, and temperature with a K-type thermocouple, all integrated with an ATmega 2560 microcontroller system. The 100% cow dung digester produced biogas with maximum methane concentrations of 3488 ppm at 21 days, indicating improved methane production compared to the 50:50 mixture of cow dung with MSW. Hydrogen sulfide reached 195 ppm and 192 ppm for the 100% cow dung and mixed digesters. Mesophilic temperature conditions were maintained throughout the digestion process. Real-time quantification of biogas composition demonstrates the capabilities of microcontroller-based anaerobic digester monitoring to provide precise methane and hydrogen sulfide measurements

Development of an innovation ecosystem model in handling the covid-19 in Indonesia

Technological innovation in the medical area is vital when the COVID-19 pandemic strikes, including in Indonesia. One of the essential innovations is a health facility for infection testing. Through the TFRIC-19 program, several Indonesian researchers have developed a mobile laboratory named Mobile Lab Biosafety Level 2 (MBSL2). MBSL2 is one of the medical innovations from the TFRIC-19 program as a measure to handle the COVID-19 pandemic in Indonesia. TFRIC-19 is an innovation system initiated by government institutions in the RnD area. Establishing TFRIC-19 was the initial step in handling the COVID-19 pandemic in Indonesia. This research aims to identify the actor's role in developing MBSL2. The technique uses the Ecosystem Pie Model (EPM) approach for analysis. It was found that the most essential aspect of creating innovation is collaboration between involved actors

Fabrication of pbs films for air mass filter of solar simulator

The production of solar panels is continuously increasing due to increasing demands at industrial and residential levels. This also leads to an increasing demand for solar simulator testing tools. A solar simulator is a tool to assess a solar panel's performance in lab and industry scales. One of the main components of the solar simulator is the Air Mass Filter (AMF). The primary function of AMF is to remove unwanted wave bands from the solar simulator light source (e.g., Xe arc lamp) so that the filtered spectrum is commensurate to that of solar irradiation. An AMF can be produced by fabricating a thin material layer on a transparent substrate like glass. The film would absorb certain wave bands in different ways. This paper reports the fabrication of the chalcogenide PbS thin films for applying AMF. The thermal evaporation technique is used for the film fabrication. PbS is known for its versatility for applications in different optical devices due to its tailorable optical properties. Different amounts (in grams) of PbS source powders are used to deposit the PbS thin films. The optical properties of the films are then examined using UV-Vis spectroscopy. The distributions of the transmittance intensity of the Xe-arc-lamp light with and without the use of the films as an optical filter are then examined using a solar simulator. From the experiments, the film deposited using a 0.012 g PbS powder source is regarded as the optimum one regarding the transmittance intensity distribution

Refinement of cooking oil using activated carbon from coconut shell and zeolite

Bulk cooking oil is obtained from traditional markets and and relatively has a characteristic color that tends to be brownish and unclear; cooking oil has been repeatedly used after frying, resulting in physical changes such as darkening, thickening, and foaming. If bulk cooking oil is repeatedly used for frying, it can be detrimental to health as it may accumulate saturated fatty acids in the oil. This condition prompted the search for solutions to purify bulk cooking oil and use cooking oil using processed zeolite and coconut shell-activated carbon as adsorbents to improve the quality of cooking oil. This research utilizes an experimental-quantitative method. Variations in composition include sample A (bulk cooking oil: 75% and processed natural zeolite: 25%), sample B (bulk cooking oil: 75% and coconut shell activated carbon: 25%), sample C (used cooking oil: 75% and processed natural zeolite: 25%), and sample D (used cooking oil: 75% and coconut shell activated carbon: 25%). The research results on the quality of coconut shell activated carbon obtain moisture content of 13.2%, ash content of 2.1%, volatile matter content of 17.9%, and carbon content of 80.0%, which meets the SNI 06-3730-1995 standard. Meanwhile, the quality results of cooking oil after the purification process obtain moisture content values of 0.09-0.10%, free fatty acid values of 0.14-0.30%, and normal color that does not exceed the maximum standard required by SNI 7709:2019 with a percentage reduction in moisture content of 0-60% and free fatty acids of 0-63.41%

Comparison of physical and acceptability tests of extra oral suction in rsgm ugm prof. Soedomo

The spread of COVID-19 through aerosols and droplets occurs during dental treatment. Dentists use high-volume suction (HVS) and saliva ejectors to suction saliva, blood, and water from the oral cavity. Since the pandemic, prototyping, production, and use of extraoral suction (EOS) have increased. EOS comprises HEPA (High-Efficiency Particulate Air), plasma ions, and ultraviolet (UV) filters. This study was used to see the effectiveness of the use of EOS through a comparison of physical and acceptability tests on the use of EOS at UGM Prof. Sodeomo Dental Hospital using three EOS brands, Coxo™, Eighteeth™ Vacstation, and Eostra™. Physical Test is used to assess the ability of a tool when used—Acceptability Test to assess user acceptance of EOS based on usage experience. The study was conducted at the UGM Prof. Soedomo Hospital (Professional Education Clinic, Resident Education Clinic, General Service Unit, and Specialistic Service Unit) in 2021 with 90 respondents who were EOS users. The EOS with the most incredible suction power, noise figure, and electrical power was Eostra™, while based on user experience, the EOS that was more accepted and more comfortable for users to use was Coxo™. EOS reduces aerosol exposure during dental treatment, and based on this study, EOS that had good capacity was not necessarily comfortable to use by users; this was because each brand had advantages and disadvantages, so the selection of EOS was adjusted to the capacity of the operator and the practice site

Kajian kualitas air dan strategi pengelolaan Rawa Jombor, Klaten, Jawa Tengah

Rawa Jombor is a semiartificial reservoir whose contruction are works for serving the needs of irrigation in the dry season and as a floading control in the rainy season. Rawa Jombor also used for fish farming and floating restaurant by the community. The existence of the cages and floating restaurant can have a negative impact to the aquatic environment due to the disposal of waste and leftover food and metabolism that is deposited at the bottom of the water. This study aims to analyze the water quality, pollution levels and to develop a management strategy of Rawa Jombor. Water quality is measured at 9 sampling point determined by purposive sampling based on the use of Rawa Jombor. Pollution level is analized uses pollution index and the management strategy uses analytical Herarchy Process. The results show that Rawa Jombor has decreased water quality marked by several parameters that do not meet the class III of water quality standards according to Government Regulation No. 82 of 2001. Rawa Jombor is included in the category of mildly polluted in areas without activity, floating restaurant and fish cage for water allotment class I, II, III and IV with an average pollution index ranging from 1,02 to 2,886. To maintain the continuity of the Rawa Jombor, a management strategy with priority on the economic aspects is needed with the development of the Rawa Jombor for sustainable fisheries