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INDONESIA
EKSAKTA: Journal of Sciences and Data Analysis
Published by Universitas Islam Indonesia
ISSN : 27160459     EISSN : 27209326     DOI : 10.20885
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Materials Science & Nanotechnology
Ekstakta is an interdisciplinary journal with the scope of mathematics and natural sciences that is published by Fakultas MIPA Universitas Islam Indonesia. All submitted papers should describe original, innovatory research, and modelling research indicating their basic idea for potential applications. The Journal particularly welcomes submissions that focus on the progress in the field of mathematics, statistics, chemistry, physics, biology and pharmaceutical sciences.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 10 Documents
 1 
Search results for , issue "VOLUME 5, ISSUE 2, October 2024" : 10 Documents clear
Lethal Concentration (LC50) of Myristicin (Myristica fragrans Houtt) on Larva Aedes aegypti Instar III Arrizqiyani, Tanendri; Mardiana, Ummy; Hidana, Rudy; Nurhamidah, Siti
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art7

Abstract

Myristicin is an active substance that can be found in nutmeg plants. The purpose of this study was to determine the LC50 myristicin against larval instar III of Aedes aegypti. The method used is the experimental method. The samples used were myristicin isolates with varying concentrations of 5 ppm, 10 ppm, 15 ppm, and 20 ppm against Aedes aegypti instar III larvae. The parameters observed were LC50 Aedes aegypti larvae for 24 hours. The results obtained are based on calculations using IBM SPSS Statistics 22.0 using the probit formula it is known that LC50 isolate myristicin which can kill larvae at 12 hours is 10 ppm and the positive control is 10 ppm. These results are better when compared with results in other studies with LC50 of 111,002 ppm and positive control at 24 hours. Based on the results of research that has been done, it can be concluded that the LC50 isolate of Myristicin (Myristica fragrants Houtt) against Aedes aegypti Instar III larvae at the 12th hour is 10 ppm.
Chemical Compound Identification of Lactic Acid Bacteria (LAB) From Porang Tubers Waste (A. muelleri blume) as Probiotic Hidayat, Habibi; Nakita Heniar Septyana; Riang Adeko; Dinda Rizki Febriani; Amri Setyawati1
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art5

Abstract

The production of amylase produced by lactic acid bacteria (LAB) has better stability. The purpose of this study was to utilize and determine the characteristics of LAB isolates from porang skin waste which have the potential as probiotics and the activity of amylase enzymes. Isolation was done by fermentation method for 48 h with the addition of starter Pediococcus acidilactici that had been cultured. The results showed that the number of colonies of N1 isolates was 49 ×108 CFU/mL with regular small round colonies, having a convex elevation, the edges of the colonies were round, yellowish white, and Gram positive bacteria because they produced a purple color on Gram staining. Acid resistance test at pH 2.0; 3.0; 4.0; 5.0 and 6.0, the isolates N1 was able to survive at each pH because it showed turbidity in the growth medium. The antimicrobial activity test showed a strong zone of inhibition on S. aureus and S. pyogenes of 10,33 and 11,17 mm and a moderate zone of inhibition on K. pneumoniae, S. dysentriae, and P. aeruginosa, respectively, which was 6,33; 7,7 and 7,5 mm. The positive N1 isolate contained alkaloids as bioactive compounds from the results of phytochemical screening and the results of the FTIR analysis showed that specific groups of alkaloids were N-H, C-N, and C=O at wave numbers 3423.30 cm-1; 1235.45 cm-1; and 1634.81 cm-1.
Alginate-Based Microbeads from Encapsulated Cosmos Caudatus K. Extracts: In Vitro Release Profiles Fadlila, Safina Samara Nur; Puspita, Oktavia Eka; Ningsih, Zubaidah; Safitri, Anna
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art4

Abstract

This study aims to investigate the microencapsulation of C. caudatus K. leaves extract under optimal conditions, focusing on its potential as a therapeutic option for type 2 diabetes. In order to determine the inhibitory effect on the α-amylase enzyme, which plays a crucial role in glucose metabolism, biological activity assays were performed. The procedure of effectively encapsulating the substance was achieved at a pH level of 6 using sodium alginate at a concentration of 2% (w/v), resulting in a 77.2% percentage of encapsulation. The experiment involving the inhibition of α-amylase exhibited an IC50 value of 69.44 ± 0.924 μg/mL, demonstrating the significant biological activity of the microcapsules. The bioactive substances encapsulated in the microcapsules were released during intervals 30-120 min, at pH conditions of 2.2 and 7.4. The release of bioactive substances was only 2.32 % after 120 minutes at a pH of 2.2, whereas it increased to 64.54 % at a pH of 7.4. This discovery indicates that the microcapsules contain the capability to be utilized for the regulated delivery of drugs. The findings of this research demonstrate the potential to develop herbal medicines with therapeutic properties through microencapsulation, providing an excellent opportunity for managing type 2 diabetes.
Study of the effect of Adding Green Tea (Camellia sinensis) Extract on the Propoerties of Biodegradable Film from κ-Carrageenan Nurlaida; Saadatul Husna; Andi Wahyu Trifany
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art3

Abstract

Carrageenan is a polysaccharide widely used as a material in the packaging industry in search of plastic replacement. κ-Carrageenan contains the lowest amount of sulfat group among other types of carrageenan which makes it the most hydrophobic one. Hence, the most suitable kind for this particular purpose. This research combined commercially available of both κ-Carrageenan and green tea extract (gte) to create a biodegradable film and then to study its characteristics. The concentration of gte was made as 0 µg/mL, 5 µg/mL, and 1 µg/mL while the concentration of κ-Carrageenan and glycerol remained constant. Incorporation of gte produces in darker, colorless film. While there is no effect of gte addition in water content observed, the higher concentration of gte will create a thinner film and lower level of water vapor permeability (WVP). An additional study of the mechanical properties of κ-Carrageenan/gte film indicated a direct proportion between the concentration of gte and tensile strength of the film. Meanwhile, there is no sign of correlation between gte concentration and elongation at break. SEM study displayed a more compact surface with smaller pores when the concentration of gte is increased
The Isolation and Identification of Thiamine-Binding Protein from Black Glutinous Rice Bran (Oryza Sativa var. Glutinosa) Gunarti, Dwirini; Josua Kristinao Hilmanto
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art6

Abstract

Thiamine is a crucial cofactor in energy metabolism. Deficiency of this vitamin can cause disorders in the nervous and cardiovascular systems. Conventional methods for examining thiamine levels in the body are expensive. One solution is using a technique similar to ELISA, namely ELPLA, which uses thiamine-binding protein as an antibody substitute. This study aims to investigate the presence of thiamine-binding protein in black glutinous rice bran (Oryza Sativa var. Glutinosa). The methods used include salting out, dialysis, and equilibrium dialysis. The results show the presence of thiamine-binding protein in black glutinous rice bran, evidenced by equilibrium dialysis.
Forecasting Hotel Occupancy Rates in Bali Province using the SARIMAX Method with Tourist Data as an Exogenous Variable Ihsan Fathoni Amri; Arya, Abimanyu; Yolan Triky; Kaia Raissa Akmalia; Abdul Ghufron; M. Al Haris
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art2

Abstract

Tourism is a crucial economic sector in Bali, Indonesia. Sustainable tourism management requires an understanding of the dynamics between tourist numbers and hotel occupancy levels. This study uses the SARIMAX (Seasonal Autoregressive Integrated Moving Average) method to estimate between the two indicators and reveals a positive correlation between the two indicators. The SARIMAX model effectively captures seasonal patterns and external factors, providing accurate forecasts and supporting tourism management in Bali. Monthly data from 2010 to 2023 were analyzed. Accurate estimates can help tourism stakeholders in formulating appropriate management strategies to optimize the tourism sector. Implementing the right strategy can help ensure the preservation of the local environment and culture, as well as long-term economic benefits for Bali. From the data we use the SARIMAX (6,1,0) (1,1,0)12 model with an AIC value of 1920.553 and a MAPE value of 27%.
Biochemical Test and Antimicrobial Potentials of Bandotan (Ageratum conyzoides) Leaves against Pathogenic bacteria in the Water Riang Adeko; Hidayat, Habibi; Andriana Marwanto; Sri Mulyati; Wiwit Aditama
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art10

Abstract

Water cleaning technology using coagulation has already been carried out use a plants in the coagulation process has never been done before, especially using plants that have potential to be a source of natural coagulants is Bandotan (Ageratum conyzoides). Plants that have the potential to be a source of natural coagulants are plants that contain a lot of protein. Each type of protein has an isoelectric point at a different pH like isoelectric point, the protein will have a neutral charge. . The calculation results of the number of colonies in samples were B1, B2, and B3 with dilutions of 266. 105, 9. 107 and 104. 109 CFU/mL. The results of Gram staining identification showed that the B1, B2 and B3 isolates had the shape are basil, basil and coccus (round) with Gram positive. The bacteria thrive in different habitats, so bacteria from the sample have been very cloudy to pH of 6.0 and 8.0 because neutralophiles properties. From the B3 isolate sample have high clear zone for Gram positive (S. aureus) of 13 mm more than Gram negative ( E. coli) of 11 mm. So that, the bandotan is able to inhibit the growth of pathogenic bacteria in the water
Analisis Harga Saham dengan Berdasarkan Rentang Waktu Sebagai Dasar dalam Penentuan Metode Peramalan yang Optimal Muhammad, Hubbi; Pramesti Melyna Mustofa
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art1

Abstract

The modeling of stock prices for telecommunications companies in Indonesia (TBIG.JK, TLKM.JK, XL.JK, ISAT.JK, TOWR.JK) is examined in this study by considering three time periods: 1 year, 5 years, and 10 years. The analysis results indicate that the distribution of stock prices for each company and time period varies, with some stocks exhibiting a distribution close to normal while others show high kurtosis. These findings suggest that the assumption of normal distribution may not be appropriate for all cases, making it essential to select a stock price prediction model that takes into account the specific distribution characteristics for each company and time period
Comparison of Inverse Distance Weighted and Thin Plate Spline Interpolation Methods in Projecting the Strength of the West Sumatra Earthquake Nabila Azzahra Haris Putri; Fauzan, Achmad
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art9

Abstract

The Indonesian archipelago is situated in a highly active geological zone, making it prone to frequent earthquakes. West Sumatra, located on the west coast of central Sumatra, comprises lowland coastal areas and volcanic plateaus formed by the Barisan Mountains, covering a land area of 42,297.30 km² (2.17% of Indonesia's territory). This research aims to determine which interpolation method—Inverse Distance Weighted (IDW) and Thin Plate Spline (TPS)—provides more accurate predictions of earthquake strength in West Sumatra. The dataset consists of 229 earthquake events, divided into 90% for training (206 points) and 10% for testing (23 points). The training data was further subdivided into 80% training data 2 (164 points) and 20% validation data (42 points). The interpolation processes using the IDW and TPS methods were repeated 100 times, with the training 2 and validation data randomly shuffled in each iteration. Visualization of the interpolation results indicated that the earthquake magnitudes ranged from 2.0 to 4.5. Although the Mean Absolute Percentage Error (MAPE) values for the TPS method on the test and validation datasets were 16.42 and 14.29, respectively—slightly lower than the MAPE values for the IDW method—the t-test results showed no statistically significant difference between the two methods. Statistically, there is no significant difference between IDW and TPS in terms of predictive accuracy. However, researchers prefer the IDW method due to its computational efficiency and simplicity. Therefore, IDW is considered the most suitable method for analyzing earthquake strength in the West Sumatra region
Treatment of Bottom Ash Medical Waste (BAMW) from Hospital Infectious Waste into Paving Block Products Riyanto, Riyanto; Asrel; Jatnika, Yuda
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 5, ISSUE 2, October 2024
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol5.iss2.art8

Abstract

Hospital solid waste is infectious waste, so it is included in the category of hazardous and toxic waste. One method of processing hospital solid waste is by burning it in an incinerator. The result of burning B3 waste at high temperatures is ash or known as bottom ash medical waste (BAMW). Ash from hospital waste processing is included in hazardous and toxic materials, so it needs to be handled properly. This study aims to process BAMW using the solidification/stabilization method. The BAMW processing product is paving blocks. The study was conducted by varying the composition of paving blocks. The variations carried out were the percentage of BAMW and its particle size. In addition, a Total Organic Carbon (TOC) level test was carried out on the water used to soak the paving blocks after being stored for 27 days. The results of the study showed that the higher the percentage of BAMW, the lower the compressive strength of the paving blocks, while the ability to absorb water and wear increased. The size of the BAMW particles also affects the quality of the paving blocks. The smaller the particle size, the better the quality of the paving blocks. Higher compressive strength indicates better quality of the paving blocks. The results of the analysis of the water used to soak the paving blocks showed that the TOC concentration was higher if the compressive strength decreased. BAMW can be used as an additional material for making paving blocks, but the composition should not be large.

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