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Journal of Science and Applicative Technology
Published by Institut Teknologi Sumatera
ISSN : 25810545     EISSN : 25810545     DOI : -
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Materials Science & Nanotechnology Mechanical Engineering
Journal of Science and Applicative Technology is soon indexed by google scholar, SINTA (Science and Technology Index), portal garuda, DOAJ (Directory of Open Access Journals). This journal has been registered at PDII LIPI (ISSN: 2581-0545). This journal is semiannual journal. It will be published in June and December. The objective of the journal is to provide a room for students, researchers, lecturers, pratictioners and communities to present their ideas regarding several topics covered in this journal. Journal of Science and Applicative Technology covers wide area of research. We welcome full research articles in the following area, including but not limited to : 1. Renewable Energy 2. Green Infrastructure 3. Community Development 4. Computer Science 5. Civil and Environmental Engineering 6. Electrical Engineering 7. Mechanical Engineering 8. Telecommunication 9. Earth and Planetary Sciences (Geography, Geodesy, Geology, Geophysics, Oceanography, Astronomy, Atmospheric) 10. Natural Sciences (Mathematics, Chemistry, Physics, Statistics) 11. Life Sciences (Biochemistry, Biology, Pharmacy) 12. Regional and City Planning
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol. 9 No. 2 (2025): Journal of Science and Applicative Technology December Chapter" : 5 Documents clear
Monitoring pH And Turbidity of Crayfish Pond Using Website and Automation Controlling Using Sugeno Fuzzy Logic Method Gamilang, Ading Atma; Febrina, Melany; Satria, Eko
Journal of Science and Applicative Technology Vol. 9 No. 2 (2025): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v9i2.2031

Abstract

Crayfish, particularly Cherax Quadricarinatus, hold significant potential for aquaculture due to their high market value and substantial demand both domestically and internationally. The growth of freshwater crayfish is heavily influenced by the pond environment. Several environmental factors affect this growth, including water turbidity, pH, dissolved oxygen, temperature, and ammonia levels. This study focuses on monitoring water turbidity and pH using DFRobot Tubidity SEN0189 and PH-4502C sensors, and displaying the results on a monitoring website. Additionally, a pump filter and aerator are employed as actuators for control. The control method used is Sugeno Fuzzy Logic, which makes control system decisions when sensors detect pH and turbidity values outside the optimal range for crayfish ponds: 6-8 for pH and 5-25 NTU for turbidity. The Sugeno Fuzzy Logic method used has inputs based on sensor readings, each with three membership degrees; for pH, Acid (0-6.5), Neutral (6-8), and Base (7.5-14); and for turbidity, Clear (0-5 NTU), Turbid (4-15 NTU), and Very Turbid (14-25 NTU). The outputs control the pump filter and aerator, with two membership degrees: Off, On, and On-Extended. The sensors have successfully measured pond turbidity with an error of 4.76% and pH with an error of 0.9%. The control system has been successfully implemented, with the pump filter and aerator activating in response to measured conditions in the crayfish pond.
Phytochemical and Antioxidant Assay of Tabebuia aurea Stem Extract: A Potential Source of Bioactive Compounds Al Akbar, Fadhlur Rohman; Kurniawan, Rahmat
Journal of Science and Applicative Technology Vol. 9 No. 2 (2025): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v9i2.2046

Abstract

Tabebuia aurea has been recognized for its traditional medicinal applications and promising antioxidant properties. The research addresses a gap in understanding the phytochemical and antioxidant characteristics of T. aurea in Indonesia. This study aims to conduct phytochemical screening and evaluate the antioxidant activity of T. aurea stem extracts. The stems of T. aurea were collected from the Botanical Garden of the Sumatra Institute of Technology and authenticated at the Bogoriense-BRIN Herbarium in Bogor to ensure the accuracy of the plant species. The samples were cleaned and dried indoors to prevent the degradation of active compounds before being ground into fine simplicia powder. The extraction process was carried out through maceration utilizing different solvents, including methanol, aquadest, ethyl acetate, and n-hexane. Phytochemical analysis revealed the presence of tannins in the methanol extract. The aquadest extract contains tannins, terpenoids, and flavonoids. Phytochemical screening indicated that the ethyl acetate extract comprises alkaloids and flavonoids, while the n-hexane extract contains alkaloids and saponins. An antioxidant assay using the DPPH method shows that T. aurea stem extracts exhibit a significant ability to scavenge free radicals. Methanol extract has IC50 value of 51.24 μg/mL (strong), aquadest extract has IC50 of 65.34 μg/mL (strong), ethyl acetate extract has IC50 of 79.88 μg/mL (strong), and n-hexane extract has IC50 of 256.73 μg/mL (very weak). For comparison, the vitamin C control has an IC50 of 43.95 μg/mL (very strong). The findings of this study demonstrate that the extract from the stem of Tabebuia aurea contains bioactive compounds with potential as a natural antioxidant source. This antioxidant property highlights the potential of T. aurea stem as a valuable raw material for developing health and cosmetic products that leverage its antioxidant capabilities.
Analysis Interaction of Nicotinamide and Ascorbic Acid and Its Derivatives as Active Substances in Skin Lightening Cosmetic Products Hidayati, Pratiwi Al Fitri; Auli, Winni Nur; Aziz, Syaikhul; Zaqia, Lulu; Liswatini, Putri
Journal of Science and Applicative Technology Vol. 9 No. 2 (2025): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v9i2.2154

Abstract

Ascorbic acid and its derivatives with nicotinamide are often used as skin lightening, anti-aging, and anti-pigmentation agents. Combining these two active substances may increase the risk of instability due to degradation. This research was conducted to determine the effect of nicotinamide concentration on the degradation process of ascorbic acid and its derivatives, and to determine the degradation products formed using liquid chromatography-mass spectrometry (LC-MS). The study was conducted by combining nicotinamide concentrations ranging from 5 to 15 micrograms per milliliter with incubation times of 1, 2, 3, and 24 hours to react with ascorbic acid and its derivatives. The spectral shape and maximum wavelength were analyzed using a UV-Vis spectrophotometer. Samples that showed changes in chemical structure were subsequently analyzed by LC-MS to identify degradation products. The results showed that only the combination of ascorbic acid and nicotinamide shifted the maximum wavelength and generated a new peak at 310 nm after 24 hours of incubation. Nicotinamide can accelerate the degradation process of ascorbic acid. The LC-MS analysis results show that the degradation products formed from the combination of ascorbic acid and nicotinamide samples are dehydroascorbic acid and 3-hydroxy-2-pyrone. These findings highlight the importance of incorporating stabilizing agents into cosmetic formulations containing unstable active ingredients, such as ascorbic acid, to ensure product stability during storage and use.
Evaluation of the Antibacterial Activity of Methanol Extracts from Leaves, Bark, and Fruit of Jambu Bol (Syzygium malaccense L.) Efendi, M. Rifqi
Journal of Science and Applicative Technology Vol. 9 No. 2 (2025): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v9i2.2172

Abstract

Syzygium malaccense L., commonly known as Malay apple, is a medicinal plant traditionally used to treat various infectious diseases. This study aimed to compare the antibacterial activity of methanol extracts from the leaves, bark, and fruit of S. malaccense against Escherichia coli and Staphylococcus aureus. Each extract was characterized through organoleptic observations, moisture content determination, total ash content analysis, and phytochemical screening. Antibacterial activity was evaluated using the agar diffusion method, with dimethyl sulfoxide (DMSO) as the negative control and chloramphenicol (30 µg/disc) as the positive control. Phytochemical screening confirmed the presence of phenolic compounds, alkaloids, flavonoids, and saponins in all extracts. The antibacterial assay revealed that all tested extracts exhibited inhibitory effects against both bacterial strains, with inhibition zones ranging from 8.15 to 13.12 mm. The methanol extract of S. malaccense bark demonstrated the highest antibacterial activity at a 20% concentration, producing a 13.12 mm inhibition zone against S. aureus.
Risk and Damage Analysis of Nile Tilapia (Oreochromis niloticus) Commodities During The Shipping Process at Selili Fishing Port, Samarinda, Indonesia: English Pratama, Andri
Journal of Science and Applicative Technology Vol. 9 No. 2 (2025): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v9i2.2193

Abstract

Tilapia is a freshwater fish commodity widely preferred by consumers in Samarinda. Due to high market demand, fish farmers have to increase the number of tilapia shipments to meet it. The Selili Fishing Port (PPI Selili) is a port where tilapia farmers can market their fish to consumers on a large scale. Transporting tilapia in open vehicles and exceeding their load capacity can cause damage to tilapia products. This study aimed to identify the sources of hazards and risks associated with the use of open vehicles for tilapia transport. Data were collected through direct observation and interviews and analyzed using Hierarchical Task Analysis (HTA), Hazard Identification and Risk Assessment (HIRA), organoleptic testing of Nile tilapia quality, and descriptive analysis. The results of this study showed that there are three stages in the tilapia shipping process: the loading stage, with six potential hazards; the transportation stage, with three potential risks; and the unloading stage, with five potential hazards that can reduce tilapia quality. Organoleptic testing showed that the tilapia remained acceptable and fit for consumption, with the highest score of 8.00 recorded during loading and the lowest during unloading, 7.00. This study provides information on the sources of hazards and risk levels in the activity of transporting tilapia in open vehicles, presented in HTA and HIRA tables.

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