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Sainteknol : Jurnal Sains dan Teknologi
Published by Universitas Negeri Semarang
ISSN : -     EISSN : 25273604     DOI : https://doi.org/10.15294/sainteknol
Core Subject : Education,
Other
Sainteknol published a scientific paper on the results of research and studies in the field of science and technology. Published biannually in June and December contained the writings lifted from the results of research and critical-analysis study in science and technology.
Arjuna Subject : Umum - Umum
Articles 5 Documents
 1 
Search results for , issue "Vol. 22 No. 2 (2024): December 2024" : 5 Documents clear
Ultrasound Assisted Ethanolic Extraction of Ipomoea reptans Poir Leaves Antioxidant Activities, Total Phenolic and Flavonoids Arum, Nabila Setri Sekar; Puspitasari, Anita Dwi
Sainteknol : Jurnal Sains dan Teknologi Vol. 22 No. 2 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v22i2.5331

Abstract

Ipomoea reptans Poir leaves contain phenolic and flavonoid compounds that can reduce free radicals and prevent diseases such as cardiovascular disease, coronary heart disease, and cancer. The drawback of conventional extraction is that it takes a long time, so a shorter extraction method is needed, one of which is the ultrasonic method. This study aims to test the antioxidant activity of ethanol extract of Ipomoea reptans Poir leaves extracted by ultrasonic method and determine the total phenolic and flavonoid content. Ipomoea reptans Poir leaves were extracted using the ultrasonic method at 50oC for 30 minutes with 70% ethanol solvent to obtain ethanol extract of Ipomoea reptans Poir leaves. Antioxidant activity test of ethanol extract of Ipomoea reptans Poir leaves using DPPH method and vitamin C as a comparison. Determination of total phenolic content using gallic acid with a maximum wavelength of 745.20 nm and operating time of 120 minutes. Determination of total flavonoid content using quercetin with a wavelength of 439.60 nm and operating time of 30 minutes. The results showed that the antioxidant activity of Ipomoea reptans Poir leaves obtained an IC50 value of 40.62 ppm (very strong). Total phenolic and flavonoids were 78.33 mgGAE/g extract and 1.03 mgQE/g extract.
The Effect of Environmental Conditions on the Alkaloid andFlavonoid Content of Basil Leaves (Ocimum basilicum L)Growing in Kandangan Village Salma, Thania Dita; Na’imah, Janatun; Yunitasari, Norainny
Sainteknol : Jurnal Sains dan Teknologi Vol. 22 No. 2 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v22i2.10628

Abstract

Basil leaves have long been used as fresh vegetables. Basil leaves are used to eliminate odors and can also be used as antiseptics. Each plant can produce primary and secondary metabolites. The production of these metabolites is influenced by environmental conditions. Kandangan Village is one of the villages in Gresik Regency which has a relatively hot temperature and many industries are located around it. The purpose of this study was to determine the results of phytochemical screening tests for the presence of alkaloid and flavonoid compounds in basil leaves growing in Kandangan Village. This type of research is experimental research. Basil leaf samples were obtained from Kandangan Village. The extraction method used was maceration using 96% ethanol solvent. The test for the presence of alkaloids used the Dragendroff test method and the Mayer test. The test for the presence of flavonoids used the Wilstater test method and the Bate Smite-Metcalfe test. The results of this study indicate that basil leaves growing in Kandangan Village are positive for the presence of flavonoids with a color change to yellow for the Wilstater test and a color change to red in the Bate Smite-Metcalfe test. However, the test for the presence of alkaloids showed negative results because there was no formation of orange to red deposits for the Dragendroff test and yellowish white deposits for the Mayer test.
Optimization Formula of Collagen Nanoemulgel from WasteMilkfish (Chanos chanos) Bones as Antiaging Nasyanka, Anindi Lupita; Tiadeka, pemta; Nur Imtihani, Hilya; Octaviary, Niken Laras; Prastiyo, Danu
Sainteknol : Jurnal Sains dan Teknologi Vol. 22 No. 2 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v22i2.14768

Abstract

Climate change has negative impacts throughout the countries in the world, especially Indonesia, which has a tropical climate. Successful aging can be achieved by building individual self-confidence through prevention and skin aging. Indonesia is a producer of milkfish waste, reaching 5.4 tons/year, which is in line with the increasing center of "Otak-otak" milkfish souvenirs found in Gresik. The waste, especially fishbones, can be synthesized into collagen. The characteristic fishbone collagen waste are in the form of large porous sheets, while particle size is an essential factor in the absorption effectiveness of cosmetics. Therefore, Nanoemulgel is able to overcome this problem. This research aims to produce best collagen nanoemulgel from milkfish bone by physical evaluation with varying ratios of surfactant: cosurfactant in collagen nanoemulgel. The research method was done experimentally by comparing the components Tween 80: PEG 400 F1 (30:30), F2 (40:20), and F3 (35:15) through qualitative and quantitative physical characteristics using one-way anova. Evaluations whose results differ significantly are pH on the 7th day, spreadability, and viscosity. Research results show F2 is the best formula and meets physical stability specifications : particle size 3.89 nm, PDI 0.1906, zeta potential -0.2 mV, pH 4.7±0.04, viscosity 890.1± 4.26 cps, spreading 5.93±0.23 cm. 
Effect of Acid-Base Composition on Physical Characteristicsand Antioxidant Activity of “Beras Kencur” EffervescentTablet Astuti, Widi; Putri, Radenrara Dewi Artanti; Sulistyaningsih, Triastuti; Azany, Ghaefira Tasya; Alexandra, Natasya Viona; Saputri, Ria; Jannah, Reni Ainun; Hadikawuryan, Danang Subarkah; Fitri, Zulfa Ajrina
Sainteknol : Jurnal Sains dan Teknologi Vol. 22 No. 2 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v22i2.20080

Abstract

This study aimed to evaluate the effect of acid-base ratio on the physical characteristics and antioxidant activity of the beras kencur effervescent tablet formulation. The formulation determination was based on the percentage inhibition value, where the highest value (76.2%) was found in beras kencur at 10 mg/mL, so that 1.5 g is needed to achieve the highest potential of radical scavenging activity. In this case, 1.5 g of sample was then incorporated into three effervescent tablets. The acid-to-base ratios used in this study were 1: 1.25 (F1), 1: 1.50 (F2), and 1: 2.50 (F3). The tablets were evaluated for pH, dissolution time, total phenolic content (TPC), and antioxidant activity. The results showed that a higher proportion of base (F3) improved solubility. Meanwhile, antioxidant activity evaluated using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) test, and total phenolic content determined using Folin-Ciocalteau, showed that tablets with a higher proportion of acid exhibited higher total phenolic content. However, considering that all three samples have very strong antioxidant activity, it can be concluded that F3 is the optimal formulation.
Design of ACS712-based Current Sensing Monitoring Evaluation for PWM Solar Charge Controller Wibowo, Apriansyah; Jayendra, I Gede Bagus; Utari, Dhea Yunita; Rasyiid, Muhammad; Aprilianto, Rizky Ajie
Sainteknol : Jurnal Sains dan Teknologi Vol. 22 No. 2 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v22i2.20604

Abstract

The rise of renewable energy has led to growing interest among researchers in optimizing renewable energy systems to harvest the highest possible energy output, especially in photovoltaic (PV) systems. Photovoltaic systems generate energy from sunlight, but the intermittent nature of sunlight poses a challenge for providing constant power. Another problem is that the most affordable conventional Pulse-Width Modulation (PWM) controllers on the market are unable to provide a current monitoring system. This issue is critical when users require detailed data to perform diagnostics on their PV systems. In this study, a monitoring system using microcontrollers and the ACS712 current sensor was developed and implemented to observe the behavior and performance of a photovoltaic (PV) charging system based on the current output from a PWM controller. The primary objective of this system is to develop a solution that can identify PV modules operating under suboptimal conditions, which can be caused by various factors such as increased solar cell temperature, cloud cover effects, PV module degradation, and the performance of the Pulse-Width Modulation (PWM) solar charge controller (SCC). This is crucial because PV modules can be susceptible to various environmental and technical factors that may impact their efficiency and power output. By closely monitoring the performance of each PV module using the ACS712-based current sensing system, the researchers aim to promptly detect and address any issues that may arise, ensuring the overall optimal operation of the PV system.

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