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Jurnal Natural
Published by Universitas Syiah Kuala
ISSN : 14118513     EISSN : 25414062     DOI : https://doi.org/10.24815/jn
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Energy Immunology & microbiology Neuroscience Physics
Jurnal Natural (JN) aims to publish original research results and reviews on sciences and mathematics. Jurnal Natural (JN) encompasses a broad range of research topics in chemistry, pharmacy, biology, physics, mathematics, statistics, informatic and electronic.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 8 Documents
 1 
Search results for , issue "Volume 24 Number 2, June 2024" : 8 Documents clear
Potential of frangipani flower (Plumeria sp.) as a source of antibacterial and antioxidants and its application in the pharmacological activities CANDRA, KRISHNA PURNAWAN; LESTARI, GISTI MALINDA; PRABOWO, SULISTYO; YULIANI, YULIANI; MARWATI, MARWATI; RACHMAWATI, MAULIDA
Jurnal Natural Volume 24 Number 2, June 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i2.29356

Abstract

Frangipani (Plumeria spp.) was a flowering ornamental plant with several metabolites that can be used as traditional medicine for various diseases such as laxative, anti-itch, anti-inflammatory, diabetic, and malaria. The Frangipani flower showed antibacterial activity against E.coli, P.aeruginosa, S.aureus, C.albicans, S.pyogenes, S.typhi, B.pumilus, B.subtilis, S.dysenteriae, P.mirabilis, P.fluorescens, B.cereus, S.flexneri, and M.furfur. Frangipani flowers also have high antioxidant activity due to their significant phenol and flavonoid content. This study provided an overview of the application of Frangipani flowers for pharmaceutical purposes.
In vitro potential control of white root fungus in nutmeg (Myristica fragrans) based on botanical fungicide of coconut shell liquid smoke CHAIRUDIN, CHAIRUDIN; SUBANDAR, IRVAN; AGUSTINUR, AGUSTINUR; MAULIDIA, VINA
Jurnal Natural Volume 24 Number 2, June 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i2.35879

Abstract

Nutmeg (Myristica fragrans) is spice plant which has an important position as a source of essential oils. An important problem in nutmeg cultivation is white root disease which can reduce nutmeg production. Until now, white root disease is still a problem in nutmeg plantations in South Aceh district. One of the solution that can be explored as an environmentally friendly control measure is to use the botanical fungicide coconut shell liquid smoke. This research aims to determine the potential of coconut shell liquid smoke in controlling white root fungus in vitro. The research was carried out in the Plant Protection Laboratory, Faculty of Agriculture, Teuku Umar University. The research design used was a non-factorial Completely Randomized Design (CRD) consisting of nine levels of liquid smoke concentration treatment; control 0%, 0.5%, 1%, 2%, 3%, 4%, 6%, 8%, 10%. Each treatment involved three replications. Data analysis was carried out using analysis of variance and Tukey's least significant difference (HSD) test.The research stages carried out consisted of producing coconut shell liquid smoke, isolating white root fungus from the roots of infected nutmeg plants and potential assay of liquid smoke in inhibiting the growth of white root fungus. In vitro bioassay result showed that liquid smoke treatment 3% was the best treatment because it was the lowest concentration causing total inhibition of the growth of white root fungus.
The effect of maleic anhydride concentration in manufacturing polypropylene grafted maleic anhydride compatibilizer on the test percent of grafting degree TANJUNG, DENNY AKBAR; JAMARUN, NOVESAR; LUBIS, ROSLIANA
Jurnal Natural Volume 24 Number 2, June 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i2.35317

Abstract

The difference in polarity between materials often prevents direct interaction; therefore, a compatibilizer is required to facilitate reactions between polar and non-polar substances. This study aims to investigate the effect of maleic anhydride (MA) concentration on the grafting process of MA onto polypropylene (PP) chains, using benzoyl peroxide (BPO) as an initiator. The blending method employing an internal mixer was used to combine the materials, and the degree of grafting was determined via titration, with three replicates performed for accuracy. The results indicated that the highest grafting degree, 10.28%, was achieved at a composition of 86% PP, 11% MA, and 3% BPO. Fourier Transform Infrared (FTIR) spectroscopy analysis of polypropylene grafted with maleic anhydride (PP-g-MA) revealed new absorption peaks at wavenumbers 1707 cm and 1162 cm. Furthermore, increasing the concentration of maleic anhydride did not significantly affect the grafting degree. This study provides valuable insight for the development of PPg-MA compatibilizers.
BHF and copula models in small area estimation for household per capita expenditure in Bogor District BELINDA, NADIRA SRI; NOTODIPUTRO, KHAIRIL ANWAR; SOLEH, AGUS MOHAMAD
Jurnal Natural Volume 24 Number 2, June 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i2.37278

Abstract

Small area statistics are required when the sample size is small to produce estimates with adequate precision. The assumptions underlying Battese Harter Fuller (BHF) unit-level models may often be unrealistic in some applications. Copula is an alternative approach when the assumptions are violated. This research discusses the performance of BHF and Copula in small area estimation (SAE) for estimating household per capita expenditure in sub-district levels. This study presents household per capita expenditure, which has a skewed distribution. Due to the fact that the data contains outliers, an appropriate method to handle outliers is also considered. In this research, the Gaussian and the Clayton Copulas are used. The results showed that the performance of BHF was better than Gaussian and Clayton Copulas, as indicated by small root mean square error (RMSE) with an average of 1.14, while the average RMSE of Gaussian copula was 2.71 and Clayton copula was 2.63. Furthermore, the coefficient of variation (CV) of BHF was also smaller compared to Gaussian and Clayton Copulas, and the resulting estimates can be categorized as reliable based on the CV of less than 25%.
Morphometric characteristics of Lake Limboto as critical lake in Gorontalo Province, Indonesia YUNGINGER, RAGHEL; PATUTI, INDRIATI MARTHA; SUPU, IDAWATI; GAFUR, NURFITRI ABDUL; ZULKIFLI, MUHAMMAD; HASAN, ELFIRAWATI; MASRURAH, ZAKIA; ZULAIKAH, SITI; TISEN, TISEN
Jurnal Natural Volume 24 Number 2, June 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i2.34071

Abstract

This research aims to investigate the factors leading to siltation in Lake Limboto by analyzing its morphometric characteristics gathered through direct field measurements and remote sensing using Geographic Information System (GIS). Lake Limboto covers an approximate surface area of 26.09 square kilometers, boasts a maximum depth of 4 meters, and maintains an average depth of 2.83 meters. The Shoreline Development Index (SDI) stands at approximately 2.57, indicating an irregular shape of the lake's water body, while the Lake Volume Development (VD) index, at 2.12, suggests a generally flat lake bottom. The Relative Depth (Zr) registers at around 0.69%, as observed from the water turbidity level. The lakebed relief in the vicinity of the lake's periphery is predominantly flat and shallow, particularly in the western, northern, and southern regions, with depths measuring less than 2 meters. In contrast, the lakebed relief in the central and eastern sections tends to be less flat but still features depths of less than 4 meters. Siltation in Lake Limboto primarily results from high sediment input originating from erosion processes, agricultural activities, and settlements in the surrounding area.
Antibacterial, antioxidant and total flavonoid of Adenostemma lavenia (L.) ZEBUA, NILSYA FEBRIKA; FUJIKO, MUFLIHAH; DACHI, KANNE; NERDY, NERDY; SEPTAMA, ABDI WIRA
Jurnal Natural Volume 24 Number 2, June 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i2.36396

Abstract

Adenostemma lavenia (L.) is one of the medicinal plants on Nias Island that is used to treat many symptoms including cough, fever and diarrhea. Empirical data of this plant suggests that these medicinal benefits can be attributed to its antibacterial and antioxidant properties, as well as the total flavonoids contained within it, but research on this is still limited. Adenostemma lavenia (L.) was extracted with ethanol, while the antibacterial properties were measured using the disc method. Antioxidant testing was conducted with the DPPH (1,1-diphenyl-2-2picrihydrazyl) inhibition method. Total flavonoids were assessed using a modified AlCl3 method with a quercetin standard. Antibacterial test results of Staphylococcus aureus, Klebsiela pneumoniae, Propionibacterium acnes, Escherichia coli, Salmonella typhi, Bacillus cereus and Shigella sonnei with mean inhibition were 8.76 0.44, 8.13 0.72, 8.77 0.45, 6.47 0.54, 7.77 0.60, 7.33 0.44, 12.06 0.60 respectively. IC50 was 59.844 3.36 ppm. Total flavonoids were 13.566 0.021 mcg/g. The results of the antibacterial test of the ethanolic extract of Adenostemma lavenia (L.) were classified as moderate. The antioxidant activity and total flavonoids were in the high category, which can be attributed to the capture of free radicals to overcome disease.
Preparation and characterization of physical properties of molded pulp from empty fruit bunches of oil palm LUBIS, ROSLIANA; RIYANTO, RIYANTO; SAISA, SAISA
Jurnal Natural Volume 24 Number 2, June 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i2.37444

Abstract

This research aims to determine the impact of pretreatment on empty fruit bunches (EFB) of palm oil fibers before the pulping process on the quality of the molded pulp produced. The study includes EFB fiber pretreatment processes, pulp production, pulp molding, physical characteristic analysis, and molded pulp performance evaluation. The pulp production process involves acid-base hydrolysis reactions. The produced molded pulp is done manually. Characterization of the molded pulp includes measurements of paper grammage, thickness, density, and moisture content. The characteristics of pulp produced from pretreated EFB fibers are as follows: an average grammage value of 415.48 g/m, paper thickness of 1.53 mm, water absorption capacity of 13.33-33.33%, density of paper of 0,026 x 106 - 0,027 x 106 g/m3, and a smooth surface morphology. Meanwhile, the characteristics of pulp produced from without pretreatment EFB fibers include an average grammage value of 372.18 g/m, paper thickness of 0.77 mm, water absorption capacity of 20.34-43.21%, density of paper of 0,004 x 106 - 0,008 x 106 g/m3, and a rough surface morphology due to pores on the fiber surface.
Antioxidant ativity of dichloromethane extract from cocoa pod husk (Theobroma cacao L.) FEBRINA, RESA VERNIA; YAHYA, MUSTANIR; GINTING, BINAWATI; SAIDI, NURDIN
Jurnal Natural Volume 24 Number 2, June 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i2.36174

Abstract

Theobroma cacao L. is a plant that is reported to have strong antioxidant potential. A study was carried out to determine the antioxidant activity of dichloromethane extract of cocoa pod husk using 1,1-diphenyl-2-picrylhydrazyl (DPPH). The cocoa pod husk was macerated using n-hexane, ammonia-dichloromethane, and methanol. The TCD extract of cocoa pod husk showed the lowest IC50 value of 14.59 0.54 ppm based on the DPPH inhibition assay. The dichloromethane extract was isolated by gravity column chromatography with Silica gel G60 as the stationary phase andn-hexane: ethyl acetate as the mobile phase (gradient elution system). Fractions with identical staining patterns were combined into six fractions (TCD 1-TCD 6). The TCD 6 showed the lowest IC50 value of 127.05 0.54 ppm according to the DPPH inhibition assay. Based on the TLC results, TCD 4 was further isolated and four fractions (TCD 4.1 to TCD 4.4) were obtained. The TCD 4.4 had the lowest IC50 value (38.66 0.96 ppm).The TCD extract showed the presence of the dominant compound, -sitosterol, as determined by GC-MS analysis.

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