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Journal of Natural Sciences
Published by Mahesa Research Center
ISSN : -     EISSN : 27215571     DOI : 10.34007
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science
The Journal of Natural Sciences is a scientific publication media in the study and development of Science in the fields of science and Education (Biology, Chemistry, and Physics). The Journal of Natural Sciences includes scientific writings in the form of conceptual, research results as well as relevant issues in the fields of science and education. The Journal of Natural Sciences is published three times a year.
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Ilmu Lingkungan (Lain-Lain)
Articles 117 Documents
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Karakterisasi dan Pengaruh Waktu Polimerisasi terhadap Sifat Fisik dan Efisiensi Dye Sensitized Solar Cell (DSSC) Berbasis Poli Kuersetin Fisyabilillah, Dea; Hardeli, Hardeli
Journal of Natural Sciences Vol 5, No 2 (2024): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i2.616

Abstract

Dye-sensitized solar cells (DSSCs) are solar cells that use dye to absorb photons from sunlight, which are then converted into electrical energy. In this study, quercetin, a flavonoid dye, was polymerized to increase the number of conjugated bonds, thereby enhancing the efficiency of the DSSCs produced. The aim of this research is to determine how polymerization time of polyquercetin affects the energy conversion efficiency of the DSSCs. The polymerized quercetin was characterized using FTIR, density, and viscosity measurements. FTIR results indicated the presence of functional groups such as O-H phenol, C=O carbonyl, C=C aromatic, and C-O, confirming the occurrence of polymerization. The polymerized quercetin was measured with a multimeter, revealing an optimal efficiency of 19.5% at a polymerization time of 45 minutes. Density and viscosity tests provided a molecular weight of polyquercetin of 20,117.3804 g/mol, resulting in a degree of polymerization of 66.56 polyquercetin chains.
Analisis Cemaran Logam Berat Cr (VI) Dan Isolasi Bakteri Pereduksinya Pada Limbah Cair Pewarna Batik di Kota Tasikmalaya Hernawan, Edi; Meylani, Vita
Journal of Natural Sciences Vol 5, No 1 (2024): Journal of Natural Sciences Maret
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i1.462

Abstract

The location of Cigeureung, Nagarasari Village, Cipedes District, Tasikmalaya City is a prominent hub for batik production in East Priangan, where a significant amount of liquid waste from batik dye is generated. Textile dyes are integral components of the batik-making process and encompass a multitude of heavy metals that possess the potential to contaminate the environment and negatively impact groundwater nutrients. Among these heavy metals, Hexavalent Chromium (Cr (VI)) stands out as a hazardous element for environmental well-being. In addition, batik liquid waste harbors many indigenous microorganisms capable of decomposing pigments. This study sought to ascertain the concentration of heavy metals and explore methods for their degradation through the utilization of biological agents, specifically microorganisms. In this particular instance, the Neutron Activation Analysis (NAA) approach was employed to ascertain the concentration of Cr (VI) present in the textile dye, utilizing both qualitative and quantitative methodologies. Isolation is conducted to identify bacteria capable of degrading colors. This process involves isolating bacteria from liquid waste and subsequently identifying them visually and physiologically, following the guidelines outlined in the Bergeys Manual taxonomy book. The study revealed that batik liquid waste collected at various distances exhibited a Cr (VI) concentration below 0.04, thereby satisfying the criteria for environmental quality. In addition, batik liquid waste contains many genera of bacteria, including as Streptococcus, Bacillus, and Streptobacillus.
Karakteristik Stomata dan Trikoma Daun Kirinyuh (Chromolaena odorata L.) Salamah, Hatipah; Oktavia, Siti Dela; Nuraini, Savira; Muliyah, Evi
Journal of Natural Sciences Vol 5, No 3 (2024): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i3.630

Abstract

Kirinyuh (Chromolaena odorata L.) is a shrub that belongs to the Asteraceae family and is classified as a dicotyledonous plant. Each plant has characteristics that are generally different, such as stomata and trichomes owned by kirinyuh leaves. This study aims to analyze the characteristics of stomata and trichomes of kirinyuh leaves, examine the structure of kirinyuh leaf layers based on transverse sections, and calculate the density of stomata and trichomes in paradermal sections of kirinyuh leaves. This study used a laboratory experimental method by making simple microscopic section preparations. This study was conducted at the Laboratory of the Faculty of Educational Sciences, Syarif Hidayatullah State Islamic University, Jakarta. Samples were obtained from Ciomas Permai Housing, Ciapus Village, Ciomas District, Bogor Regency. The results of this study show that paradermal sections on the adaxial cross-section, kirinyuh leaves have irregular epidermis with anomocytic oval type stomata with kidney-like guard cells and non-glandular type trichomes with multicellular uniseriate type. The stomata found were 115 with a density of 8.38 stomata/mm2 and an index of 0.056 mm2, while the trichomes found were 3 with a density of 0.21 trichomes/mm2. In the transverse section, the layers of kirinyuh leaves are composed of upper epidermis tissue, palisade tissue, blood vessel bundles, sponges, lower epidermis, and trichomes.
Efektivitas Silika (SiO2) Dari Tanah Napa Situjuah Sebagai Adsorben Ion Logam Pb2+ Melan, Putri; Mawardi, Mawardi
Journal of Natural Sciences Vol 5, No 3 (2024): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i3.696

Abstract

Silika merupakan salah satu mineral yang memiliki banyak kegunaan di berbagai industri seperti keramik, semen dan bangunan, kosmetik, biosensor dan lain sebagainya. Pada umumnya, silika dapat diperoleh dengan cara sintesis dan ekstraksi dari bahan alam yakni salah satunya mineral tanah napa yang memiliki kandungan silika yang tinggi di dalamnya yang dapat diekstraksi dengan menggunakan pelarut basa seperti NaOH. Silika ini nantinya dapat dimanfaatkan sebagai adsorben dalam penelitian dengan logam seperti logam timbal. Penelitian ini bertujuan untuk mengetahui kapasitas adsorpsi maksimum silika terhadap ion Pb2+ dengan menggunakan metode kolom yang berhubungan dengan pengaruh konsentrasi, pH, laju alir dan aplikasi pada sampel real serta menentukan kapasitas serapan maksimum dan afinitas penyerapan adsorben ditetukan dengan Persamaan Isoterm Langmuir dan analisa logam dilakukan dengan instrument AAS dan menentukan kristalinitas silika dengan XRD. Hasil penelitian ini menunjukkan bahwa konsentrasi optimum adalah 300 mg/L dan ph larutan optimum adalah 4. Hasil penelitian menunjukkan bahwa Qmaks ion logam Pb(II) sebesar 11,061 mg/g dan ukuran kristal sebesar 48,76 nm.
Pengaruh pH dan Konsentrasi Larutan terhadap Penyerapan Zat Warna Methylene blue Pada Tanah Napa dengan Metode Batch Firman, Firman; Mawardi, Mawardi
Journal of Natural Sciences Vol 5, No 3 (2024): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i3.695

Abstract

The textile industry in Indonesia is experiencing very rapid development, each production produces waste in the form of dye waste. Methylene blue is a dye that is widely produced. Mehylene blue is classified as a cationic dye and has the potential to pollute the aquatic environment if not managed properly. This dye is difficult to decompose naturally and can cause damage to ecosystems and threats to human health. This study aims to reduce the content of Methylene blue dye in waters with an adsorption process using napa soil adsorbent from Pesisir Selatan Regency, West Sumatra which has been activated with 1M KOH to increase its adsorption capacity. Adsorption was chosen as a treatment method due to its advantages in efficiency and simple process. The research was conducted to obtain optimum conditions by looking at the dye uptake capacity in the form of variations in pH and initial concentration. The instrument used in this research is UV-VIS. The results showed that the optimum condition of adsorption was obtained at pH 6 with an initial concentration of 500 mg/L, where the maximum adsorption capacity reached 59.35 mg/g and adsorption efficiency of 98.89%.
Uji Aktivitas Antioksidan Ekstrak Metanol Tangkai Daun Strawberry (Fragaria x annanasa) Dengan Metode DPPH Ayunda, Sarah; Etika, Sri Benti
Journal of Natural Sciences Vol 5, No 3 (2024): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i3.697

Abstract

Free radicals are molecules that have one or more unpaired electrons in their outer orbit and are highly reactive. The severe reactions produced by highly reactive free radicals can produce unusual compounds and damage vital body cells. This study aims to determine the content of secondary metabolites and test the antioxidant activity of methanol extract of Strawberry  stem (Fragaria x annanasa). The Strawberry  stem samples used came from the Alahan Panjang area, West Sumatra. Extraction was carried out by maceration method using methanol solvent. The results of the maceration were then evaporated using a rotary evaporator to obtain a thick methanol extract of 13.3037 grams. Methanol thick extract was analyzed for secondary metabolite content by phytochemical screening. Antioxidant activity test using DPPH method. Methanol extract of Strawberry  petiole contains alkaloids, saponins and phenolics that have antioxidant activity that can counteract the formation of free radicals. The results of antioxidant tests conducted using UV-Vis spectrophotometry on methanol extract of Strawberry  petiole showed an IC50 value of 33.4816 ppm with a comparison using vitamin C as a positive control showing an IC50 value of 22.3024 ppm.
Peran Pendekatan STEM (Science, Technology, Engineering, and Mathematic) dalam Pembelajaran Laila, Sherly; Wardani, Rini Sri; Umayah, Aura Rhomatul; Huda, Muhammad Khomarul; Hutahuruk, Ahmad Fakhri
Journal of Natural Sciences Vol 5, No 3 (2024): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i3.703

Abstract

The STEM approach is an affective learning method that can improve the quality of science education by integrating various elements of science holistically, so that it can improve students’ cognitive, psychomotor and affective skills. This study aims to examine the role of the STEM approach in learning and its impact in growing students’ interest in science and technology, as well as preparing them to face the challenges of the world of work in the future. The method used is content analysis from various literature related to the implementation of STEM in learning. The results of the study show that the application of STEM is able to integrate various scientific disciplines and have a positive impact on students’ skills, so this approach is recommended to be applied in learning.
Effect of Carrageenan Addition on the Quality of Bacterial Cellulose-Based Biodegradable Plastic from Coconut Water Humaira, Alifah; Putra, Ananda
Journal of Natural Sciences Vol 5, No 3 (2024): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i3.698

Abstract

Plastic is often used in daily life, resulting in a lot of plastic waste. Therefore, a solution is needed, namely the production of biodegradable plastic. This research aims to see the effect of carrageenan addition variation on the quality of bacterial cellulose-sorbitol-based biodegradable plastic from coconut water (Cocos nucifera) which includes mechanical properties testing (tensile strength, elongation, and moduulus young), biodegradation testing, and testing with FTIR and XRD instruments. In this study, sorbitol 30 % was used as a plasticizer with carrageenan variations of 0%, 0.5%, 1%, 1.5%, and 2%.  The mechanical properties test results obtained a maximum tensile strength value of 126.58 Mpa in the 2% carrageenan addition variation, where the tensile strength value has met SNI standards for synthetic plastics which ranges from 24.7-302 Mpa, the Modulus young value obtained is 980.46 Mpa, and the elongation value is 21.68%. For the biodegradation test, the plastic added with carrageenan increased and on the 15th day the plastic was completely degraded. On FTIR functional group analysis, no new groups were formed and on XRD analysis on the addition of carrageenan, the % crystallinity of the plastic was greater at 98.66% compared to bacterial cellulose 97.01%, and bacterial cellulose-sorbitol 95.79%.
Identifikasi Dan Potensi Manfaat Tanaman Obat Di Taman Nasional Baluran Kemal, Muhammad; Syahri, Alvi; Safa, Davina; Fadillah, Nurul; Yasmin, Amirah; Muliyah, Evi; Ridhwan, Muhammad; Noor, Meiry Fadilah
Journal of Natural Sciences Vol 5, No 3 (2024): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i3.679

Abstract

Medicinal plants, or biopharmaceuticals, are plant species with properties that serve as remedies for treating and preventing diseases. This study aims to identify medicinal plant species and analyze their potential in the Evergreen Forest and Seasonal Forest of Baluran National Park. The method used is field observation with an exploration approach, recording medicinal plant species at observation sites and identifying their scientific names and medicinal uses. Baluran National Park is a conservation area that sustainably manages natural resources, including the use of medicinal plants by local communities. This study recorded 55 species of medicinal plants from 26 families utilized in traditional medicine. Plant parts used include leaves, flowers, fruits, rhizomes, bark, stems, and seeds. The seasonal forest environment also influences the active compound content of medicinal plants. The findings highlight the importance of conserving medicinal plants to support traditional use and environmental sustainability.
Pengaruh CaCO3 terhadap Kualitas Plastik Biodegradable Berbasis Selulosa Bakteri Sorbitol dari Air Kelapa Safhira, Elsa; Putra, Ananda
Journal of Natural Sciences Vol 5, No 3 (2024): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i3.700

Abstract

Plastic is one of the most commonly used materials in society. The accumulation of plastic waste has a negative impact on the environment and human health. To mitigate these effects, there has been a shift toward environmentally friendly packaging. Biodegradable plastic is an eco-friendly material because it can be easily degraded by microorganisms. This study aims to investigate the effect of varying CaCO3 additive concentrations on the quality of biodegradable plastic based on bacterial cellulose-sorbitol from coconut water. The study includes testing mechanical properties, biodegradability, and analysis using FTIR and XRD instruments. In this research, 30% sorbitol was used as a plasticizer, and CaCO3 was added in varying amounts: 2 g, 4 g, 6 g, and 8 g. The results of the mechanical property tests showed a tensile strength of 179.85 MPa at 8 g of CaCO3 addition, which meets the SNI (Indonesian National Standard) range for conventional plastic (24.7–302 MPa). The elasticity was 906.21 MPa, and the elongation value was 31.50%. Biodegradability tests revealed that plastic with CaCO3 showed increased degradation, with 90% degradation observed by day 15. FTIR functional group analysis showed no new functional groups, while XRD analysis indicated that the addition of CaCO3 increased the crystallinity of the plastic to 96.92%, compared to 95.79% for bacterial cellulose-sorbitol without CaCO3.

Page 8 of 12 | Total Record : 117

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