Journal of Science and Application Technology (JSAT - Institut Teknologi Sumatera)
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Penentuan Karakteristik Fisikokimia dan Fungsional Minuman Teh (Camellia sinensis L.) dalam Kemasan
Full text linkTea contains chemical compounds that are beneficial to the body, such as phenolic compounds. Packaged tea drinks are obtained from steeping tea with the addition of water, sugar, synthetic flavors, stabilizers, acidity regulators, and food additives that are tightly packaged. This research aims to evaluate the suitability of the quality of packaged tea drinks based on SNI requirements and determine physicochemical characteristics which include pH and total dissolved solids, while functional properties include total phenols and antioxidant activity. This research used a purposive sampling technique designed with a Completely Randomized Design with two duplicate replications. The results of the physicochemical and functional characteristic tests were analyzed using the ANOVA method and DMRT with α=5%. The results show that ready-to-drink tea products have a pH value between 5.4–6.79, total dissolved solids with a value of 6.5–8.2 °Brix, and antioxidant activity with a value of 56.83%–79.15%, where in terms of physicochemical content and functional properties, the five samples of packaged tea drinks can be said to be good. However, only 3 of the 5 samples had phenol content that was in accordance with that required by SNI 3413 of 2011
Reinforcing Local Food Security through Agrogeological Perspectives: South Lampung, Indonesia
Full text linkLocal food security is a critical priority for the coming decades, especially in Indonesia. As the population grows, it is essential to meet local food needs before participating in the national supply. South Lampung, a key region in Sumatra, plays a vital role in the nation’s food supply. However, rapid population growth in this area has raised concerns about the conversion of agricultural land to residential use. To address these challenges, this study raises agrogeology as an alternative approach to reinforcing local food security. By re-evaluating the regional geological characteristics, the study aims to understand the distribution of productive, traditional paddy fields. Field surveys and spatial analyses were conducted for this study. The findings reveal that the silicate-rich lithology in the region’s pyroclastic deposits significantly contributes to maintaining fertile soils, particularly in areas such as Candipuro, Jatiagung, and Palas. Natural drainage systems further support rice cultivation. In alignment with the Sustainable Development Goals, the agrogeological perspective emphasizes the need to mitigate land conversion and improve land-use planning. This approach offers a sustainable pathway to enhance paddy field productivity and ensure water and nutrient availability, thereby supporting long-term local food security
THE EFFECT OF DIFFERENCES IN CHARACTERISTICS OF BIDARA LEAF EXTRACT (ZIZIPHUS MAURITIANA L.) OBTAINED FROM MACERATION, ULTRASONIC, AND SOXHLET METHODS
Full text linkBidara leaves are known to contain alkaloids, flavonoids, steroids, tannins, and saponins. This study aims to analyze how the three extraction methods used can affect the characteristics of bidara leaf extract. The extraction methods used in this study were the maceration method, the ultrasonic method, and the soxhlet method. The calculation of the yield value was carried out and the difference was seen with the largest number in the ultrasonic method 10.37% w/w, the soxhlet method 3.49% w/w, and the maceration method 3.68% w/w, then the stock solution calculation was carried out and the results were obtained ultrasonic method 0.1%, soxhlet method 0.0044%, and maceration method 0.012%. The evaluation used was phytochemical screening. The results of phytochemical screening showed that the leaf extract contained secondary metabolites, namely alkaloids, flavonoids, steroids, tannins, and saponins. It can be concluded that the three extraction methods in bidara leaves did not show differences in the presence of secondary metabolites, but affected their yield values
Solvent Exploration for Propolis Extraction Using Isopropanol, Ethanol, Propylene Glycol as Antibacterial Agent Against Staphylococcus aureus and Escherichia coli
Full text linkPropolis is one of the bee’s products that is reported has many benefits from its compounds. Propolis has a complex compound, therefore it is important to choose a suitable solvent for the extraction process. The aim of this study was to determine propolis’ solubility, the secondary metabolite classes, and antibacterial activity against S.aureus and E.coli of propolis extracted using different solvents, namely ethanol 96%, isopropanol, propylene glycol, and the combination of three solvents. There were nine ratios of used in the extraction process, A1(Ethanol 96%); A2 (Isopropanol); A3 (Propylene glycol); B1((Ethanol 96%:Isopropanol:Propylene glycol (6:3:1)); B2 ((Ethanol 96%:Isopropanol:Propylene glycol (1:6:3)); B3 (Ethanol 96 %:Isopropanol:Propylene glycol (3:1:6)); C1 ((Isopropanol:Propylene glycol (8:2)); C2 (Ethanol 96%:Propylene glycol (2:8)); dan C3 (Ethanol 96%:Isopropanol (8:2)). The best solubility was determined by the height of the precipitate after centrifugation. The secondary metabolite classes were tested on each extract. Antibacterial activity was tested using the diffusion method. The order of solvents that produced low precipitate was isopropanol, ethanol 96%, and propylene glycol. All propolis extracts were positive alkaloid, saponin, tannin, flavonoid, and negative for steroid/triterpenoid. The result of antibacterial activity against S.aureus in extracts A1, A2, B1, B2, B3, C1, C2, C3 showed weak inhibitory with respective inhibition zones 2,10 ± 0,62; 2,40 ± 0,60; 3,17 ± 0,80; 3,50 ± 0,44; 3,30 ± 0,10; 3,30 ± 1,56; 3,10 ± 0,96; 3,78 ± 0,69. All propolis extracts didn’t present any inhibition zones against E.coli
Perhitungan Premi Asuransi Pertanian Pada Tanaman Padi Di Provinsi Jawa Barat Menggunakan Metode Copula
Full text linkAgricultural insurance is an important instrument to protect farmers from risks that can threaten the sustainability of farming, such as crop failure due to natural disasters, pest attacks, and plant diseases. Rice, as a strategic commodity for national food security, is a priority in insurance protection programs. This study aims to calculate rice insurance premiums in West Java Province using the copula method, based on secondary monthly data of rice production and dry grain prices (GKG) from January 2020 to December 2023, as well as daily rainfall data. The methodology includes data exploration, distribution fitting, copula parameter estimation, and premium calculation based on rainfall threshold values. The analysis results indicate that the Gaussian copula is the best model for capturing the dependence between variables, with the lowest AIC and BIC values. Premium calculations based on rainfall indices show variations according to threshold values, with lower premiums for smaller thresholds, confirming the effectiveness of the Gaussian copula in modeling risk for agricultural insurance premiums
TRANSFORMASI RUANG DAN NILAI LAHAN: STUDI KASUS KORIDOR JALAN H. M. YASIN LIMPO, GOWA
No full textThe H. M. Yasin Limpo Street corridor in Gowa Regency is experiencing increasingly dense and uncontrolled development, indicating a mismatch with the Regional Spatial Plan (RTRW). This situation threatens to degrade urban spatial quality, reduce comfort and safety, and hinder the realization of sustainable urban environments. The rapid and extensive land use changes in this area highlight the need for an in-depth study of the relationship between rising land values and land use transformation. This study aims to analyze the influence of land value on land use change within the corridor. A descriptive quantitative approach was used, employing overlay analysis, time series analysis, and comparative techniques to identify and assess land use dynamics over the past five years. The results show a 76.3% (1.32 ha) increase in commercial and service land, a 20.4% (1.27 ha) decrease in open land, and a 37.9% (1.27 ha) increase in built-up areas. Land value rose by 14.1%, from IDR 3,900,000/m² to IDR 4,450,000/m², contributing to a 32.67% intensification in land use change, predominantly toward commercial and service functions
Pelatihan Olah Data dan Visualisasi Data Statistik dalam Peningkatan Kompetensi Perangkat Desa Badran Sari, Lampung Selatan
No full textThe use of data processing skills is something that is very important in various fields. The data processing process can use various applications, one of which is the number/data processing application which is commonly known as the Ms. Excel application. Ms. Excel is a software program that allows users to process and calculate numerical data so that calculations and reading data are no longer done manually. The problem with partners is the lack of competence of village officials regarding the use of technology in processing village data. Based on the problems faced by partners, the PkM team offers a solution, namely providing training in processing and analyzing statistical data using Ms. Excel which aims to help village officials to be able to process data and be able to visualize the data into images/graphs that are more attractive to the community so that able to improve the quality of data processing contained in village officials
ANALISIS KESESUAIAN LAHAN UNTUK PERMUKIMAN DAN PARIWISATA BERDASARKAN ASPEK GEOLOGI LINGKUNGAN DENGAN METODE SPATIAL MULTI-CRITERIA EVALUATION (SMCE) DI DAERAH KECAMATAN NUSANIWE, KOTA AMBON
Full text linkLahan adalah sumber daya yang terbatas dan harus dimanfaatkan sesuai dengan daya dukung lingkungannya. Kecamatan Nusaniwe memiliki potensi sumber daya geologi dan rawan akan bencana geologi, sehingga diperlukan analisis kesesuaian lahan terutama untuk permukiman dan pariwisata. Beberapa hal yang menjadi alasan penelitian ini dilakukan antara lain; pembangunan permukiman pada Kecamatan ini belum merata, terdapat banyak lokasi pariwisata dan morfologinya di dominasi oleh lereng yang curam dan pesisir pantai. Penelitian ini menggunakan metode Spatial Multi-Criteria Evaluation (SMCE) untuk menganalisis kesesuaian lahan permukiman dan pariwisata. Dari hasil penelitian, menunjukkan bahwa lahan yang sesuai untuk dijadikan lokasi pembangunan permukiman, antara lain; 0.7 km² di Desa Amahusu, 1.25 km² di Negeri Nusaniwe, 1.5 km² di Desa Latuhalat, 0.07 km² di Kelurahan Waihaong, 2.04 km² di Negeri Urimessing, 0.2 km² di Kelurahan Mangga Dua, 0.1 km² di Kelurahan Urimessing, 0.45 km² di Kelurahan Kudamati, 0.41 km² di Negeri Seilale, 0.6 km² di Kelurahan Benteng, dan 0.32 km² di Kelurahan Nusaniwe. Sedangkan untuk pariwisata terdapat empat lokasi yang cukup sesuai dan memiliki nilai keragaman geologi (geodiversity) yaitu Bukit Paralayang, Pantai Pintu Kota, Pantai Tanjung Nusaniwe dan Pantai Batu Lubang. Keempat lokasi ini berpotensi untuk dilakukan pengembangan geopark pada kawasan wisata tersebut
THE OPTIMALIZATION OF EXTRACTION METHOD OF AVOCADO LEAVES
Full text linkThis study aims to determine the most effective extraction method to obtain bioactive compounds from avocado (Persea americana Mill.) leaves, which are known for their antioxidant and antibacterial activities. Four extraction methods were evaluated—maceration, digestion, Soxhlet extraction, and ultrasonic extraction—using methanol and water as solvents. Evaluation was based on yield and stock solution concentration. Results showed that ultrasonic extraction produced the highest yield with a stock concentration of 2.5% m/v, indicating superior extraction efficiency compared to the other methods. Maceration and Soxhlet extraction produced moderate values, while digestion produced the lowest stock solution concentration (0.9%). These findings indicate that ultrasonic extraction is a rapid and efficient technique for extracting bioactive compounds from natural materials, making it highly relevant for application in cosmetic and pharmaceutical product development
Flood susceptibility mapping using GIS-based composite mapping analysis: a multi-district assessment in Lampung Province, Indonesia
Full text linkFlooding is a recurring hydrometeorological disaster in Lampung Province, Indonesia, particularly affecting Pesawaran Regency, South Lampung Regency, and Bandar Lampung City. This study mapped flood susceptibility using Geographic Information Systems (GIS) with Composite Mapping Analysis (CMA) and scoring methods to support disaster risk reduction planning. Six parameters were analyzed: rainfall, land cover, slope, elevation, soil type, and river buffer distance. Parameter weights were derived objectively through CMA based on spatial analysis of 258 historical flood events (2018-2024). Rainfall data (2015-2024) were interpolated using Inverse Distance Weighting, and spatial analysis was conducted in ArcGIS 10.8. Results show that 90.66% of the study area falls within moderate to high susceptibility classes. Rainfall received the highest weight (20%), followed by elevation (19%), soil type (18%), land cover (16%), river buffer (14%), and slope (13%). Model validation achieved 77.78% accuracy when compared with historical flood locations across 45 sub-districts. High susceptibility areas are characterized by annual rainfall exceeding 2,500 mm, elevations below 50 masl, poor soil infiltration capacity, and dense settlement. The CMA method provides objective parameter weighting while maintaining computational simplicity suitable for resource-constrained settings, offering a practical framework for flood susceptibility assessment in similar tropical regions