cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Elfis
Contact Email
elfisdoang@gmail.com
Phone
+6281374567116
Journal Mail Official
ariefyandra0811@edu.uir.ac.id
Editorial Address
Jl. Kaharuddin Nasution No. 113. Pekanbaru-Riau
Location
Kota pekanbaru,
Riau
INDONESIA
Journal Of Research and Education Chemistry (JREC)
Published by Universitas Islam Riau
ISSN : 26858967     EISSN : 26858959     DOI : https://doi.org/10.25299/jrec.2022.vol4(1).9315
Core Subject : Science, Education, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Education
1. research and reviews literature about chemistry education such as : instruction, learning and theaching, curriculum development, learning environment, theacher education, educational and educational development in chemistry education 2. research and review literature about chemistry such as : organic, inorganic physical, analitycal, biochemistry, material chemistry, environment, ethnochemistry and its application in teaching and learning
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 20 Documents
 1   2 
Search results for , issue "Vol. 7 No. 2 (2025): Oktober" : 20 Documents clear
ANALISIS TIAMFENIKOL DALAM SIRUP KERING DAN DEGRADASINYA PADA SUHU YANG BERBEDA MENGGUNAKAN METODE KCKT Vandian Nur,, Achmad; Giani Khairunnisa, Cantika; Santika Rahmasari, Khusna; Bagus Pambudi, Dwi
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).19098

Abstract

Thiamphenicol is a broad-spectrum antibiotic that works similarly to chloramphenicol.Thiamphenicol is formulated as a dry syrup because it is unstable in water, where the amide group can undergo hydrolysis. This study aimed to determine the impact of temperature and storage time on the drug content in thiamphenicol dry syrup. The study involved physical stability testing by observing organoleptic changes and pH testing. Chemical stability was assessed by measuring drug content using HPLC (High Performance Liquid Chromatography) with a mobile phase of aquabides and methanol (4:1). The sample preparation involved storing thiamphenicol dry syrup for 7 days at room temperature (15 - 30ºC) and cold temperature (2 - 8ºC). The results indicated that temperature and storage time did not affect the physical stability during the storage period. However, a significant decrease in drug content was observed: at room temperature, a reduction of 37,20% in sample 1 and 54,57% in sample 2; at cool temperature and at cold temperature, a reduction of 29,73% in sample 1 and 24,73% in sample 2. Statistical analysis using One Way ANOVA showed significant values of 0.000 < 0.05 for sample 1 and 0.001 < 0.05 for sample 2, indicating that temperature differences significantly affect the thiamphenicol content. The results demonstrate that temperature and storage time have a significant impact on the chemical stability of thiamphenicol dry syrup.
ANALISIS PEMAHAMAN MAHASISWA UNIVERSITAS NEGERI MEDAN TERHADAP KONSEP SIFAT KOLIGATIF LARUTAN DALAM PEMBELAJARAN KIMIA Serli Nawati Azhari; Syafitri, Amelia
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).22503

Abstract

This study aims to analyze students' understanding of the concept of colligative properties of solutions in chemistry learning. The research method used is a quantitative method with data collection techniques through a dare questionnaire distributed using Google Form. The research subjects consisted of students of Medan State University who had studied the topic of colligative properties of solutions. The questionnaire used contained a series of closed and open questions to measure the level of students' understanding, including conceptual aspects, applications in daily life, and difficulties faced in understanding the material. The data obtained were analyzed statistically using descriptive tests to determine the distribution of students' understanding, as well as correlation tests to see the relationship between certain factors, such as academic background and learning resources used. The results showed that the level of students' understanding varied, with most students having a moderate understanding of the concept of colligative properties of solutions. Factors that contributed to this level of understanding included the teaching method used, the availability of learning resources, and students' learning motivation. The main challenge faced by students was in understanding the concepts of osmotic pressure and freezing point depression. These findings have an impact on improving chemistry learning strategies, especially in the use of more interactive and contextual methods to help students understand the concept of colligative properties of solutions more deeply.
Pengaruh Metode Ekstraksi Terhadap Kandungan Flavonoid dan Efektivitas Antibakteri Hand Sanitizer Dari Kulit Jeruk (Citrus Sinensis L.) Aisyah, Widya; Sinardi, Sinardi
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).23065

Abstract

Sweet orange peel (Citrus sinensis L.) is an agricultural by-product with promising potential as a natural raw material for hand sanitizer due to its bioactive compounds, particularly flavonoids, known for their antibacterial properties. This study investigates the influence of two extraction methods—infusion and maceration—using peel weights ranging from 10–50 g, on the characteristics and quality of hand sanitizer formulations. The products were evaluated through pH, density, drying time, organoleptic properties, skin irritation, flavonoid identification, and antibacterial activity against Escherichia coli using the disc diffusion method. Results showed that maceration yielded a more intense brick-red color at 40 g and 50 g, while infusion produced only a concentrated yellow extract. All formulations exhibited pH values within the safe skin range (4.5–6.5), density of 0.86–0.90 g/mL, and drying times of 14–22 seconds. No irritation was observed in skin tests, and panelist acceptance was higher in formulations containing 30–50 g peel. However, none of the hand sanitizer formulations inhibited E. coli growth (0 mm), in contrast to the positive control (Ciprofloxacin 100 ppm), which produced a 31.55 mm inhibition zone. The lack of activity is likely due to the Gram-negative nature of E. coli, low flavonoid concentrations, limited gel diffusion, and compound degradation.
IDENTIFIKASI DAN PEMETAAN KUALITAS AIRTANAH DANGKAL DI SEKITAR DAERAH INDUSTRI TAHU, KECAMATAN MANDAU, DURI fauzia, sifa; Mairizki, Fitri
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).23216

Abstract

Mandau District is located in the city of Duri, Riau Province, and is an area experiencing rapid economic growth based on household-scale industries. One of the growing micro-enterprises is the tofu industry, which generates liquid waste. The liquid waste from the tofu industry is characterized by a high content of organic matter, COD, and total nitrogen (Ntotal), which, if not properly treated, can seep into the ground and contaminate the groundwater layer. The aim of this study is to analyze the physical and chemical quality of groundwater and assess its feasibility as a source of drinking water. The method used in this research involves field sampling of groundwater using purposive sampling, followed by laboratory analysis. The parameters tested include color, taste, odor, TDS, EC, pH, COD, and Ntotal. The results of the physical and chemical analysis of groundwater at 20 stations in the study area show that all stations (100%) have clear water; all stations (100%) have tasteless groundwater; 19 stations (95%) have odorless groundwater and 1 station (5%) has odorous groundwater; all stations (100%) have TDS values < 500 mg/l; EC values range from 31 to 280 µS/cm; pH values range from 7,69 - 7,83; 19 stations (95%) have COD values < 10 mg/l and 1 station (5%) has COD > 10 mg/l; and Ntotal values range from 0,6 - 3 mg/l. Based on drinking water quality standards, none of the stations meet the requirements for potable water; however, the groundwater can still be used for purposes such as bathing and washing.
Analisis Perbedaan Hasil Belajar Peserta Didik dengan Media Dakonic dan Sempotron dalam Pembelajaran Sistem Periodik Unsur Permatasari, Afita; Piola Naretin Rahayu, Inka; Kautsar Althaf D.I.H, Salsabila; Puji Astuti, Andari
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).25067

Abstract

This study aims to analyze the differences in student learning outcomes using Dakonic (Chemistry Dakon) and Sempotron (Electronic Abacus) media in learning the periodic system of elements. The research employed a quantitative method with a quasi-experimental design using the Nonequivalent Control Group Design. The subjects consisted of 72 tenth-grade students of SMA Negeri 15 Semarang, divided into a control class using Sempotron and an experimental class using Dakonic. The research instrument was a learning outcome test that had been validated and tested for reliability. Data were analyzed through normality test, homogeneity test, N-Gain, and t-test. The results showed that the experimental class obtained an average N-Gain of 0.701 (high category), while the control class only reached 0.479 (medium category). The t-test also revealed a significant difference between the two classes with a significance value of 0.000 (<0.05). These findings indicate that Dakonic is more effective in improving students’ understanding of the periodic system of elements compared to Sempotron. Therefore, Dakonic can be considered as an innovative, engaging, and culturally relevant chemistry learning medium
PENGEMBANGAN MEDIA PEMBELAJARAN KIMIA RAMAH BUDAYA: DAKONIC BERBASIS PERMAINAN DAKON Inka Piola; Permatasari, ⁠Afita; Kautsar Althaf D.I.H, ⁠Salsabila; Puji Astuti, ⁠Andari
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).25110

Abstract

This study developed a culturally responsive chemistry learning media based on the traditional game dakon, named DAKONIC (Dakon Periodic Chemistry), for teaching the Periodic Table of Elements. The research employed a Research and Development (R&D) method using the ADDIE model, involving 36 tenth-grade students at SMA Negeri 15 Semarang. Validation by material experts, media experts, and teachers indicated that DAKONIC was highly feasible with a 90% validity score. Practicality testing from teachers and students achieved 87% (practical category). Effectiveness testing using a paired sample t-test showed a significance value of 0.000 (< 0.05), confirming that DAKONIC effectively improved students’ understanding of the periodic table. The media was designed from recycled wood (90 × 30 cm) with 18 holes representing groups and periods, 2 large scoring holes, 118 element replicas, and 56 educational challenge cards. It is portable and equipped with a teaching module to support the Teams Games Tournament (TGT) cooperative learning model. Findings demonstrate that DAKONIC is feasible, practical, and effective, successfully integrating local cultural wisdom with modern chemistry learning.  
UJI EFEKTIVITAS METODE PEMBUATAN BIOKERAMIK CANGKANG TELUR MENGGUNAKAN SODIUM ALGINAT DAN PATI JAGUNG Khalyla Hafsa Khairunnisa; Mustofa Kamal, Dianta; Djonaedi, Emmidia
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).20065

Abstract

The utilization of eggshell waste in Indonesia is still very low, which is only around 7-8% of the total waste of 611,790 tons per year, although the calcium carbonate content has the potential to be used as a raw material for bioceramics. Suboptimal utilization risks polluting the environment. This study aims to develop the utilization of eggshell waste into bioceramics by comparing the effectiveness of two types of binders, namely sodium alginate and corn starch. The manufacturing method includes the process of powdering eggshells, mixing with binders, molding, and drying. Evaluation is carried out through density testing, water absorption, and degradation tests in water. The results showed that bioceramics with corn starch had a higher density (2.05 g/m³), lower water absorption (34.5%), and neutral pH of the degradation water (pH 7), compared to sodium alginate which had a lower density and higher absorption (50.5%) with pH 8. These findings indicate that corn starch is superior in forming stable and solid bioceramics, so it has the potential to be applied in environmentally friendly craft products and supports the reduction of organic waste in the community.
Pembuatan Bioetanol Dari Tandan Kosong Kelapa Sawit Menggunakan Teknik Imobilisasi Sel Saccharomyces Cerevisiae Nayandra Hazara Assyabil; Marlinda, Marlinda
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).21594

Abstract

Empty palm fruit bunches (TKKS) are solid waste from palm oil mills that have the potential to be used as raw material for bioethanol due to their high cellulose content of 45.95%. This study aims to produce bioethanol from TKKS using Saccharomyces Cerevisiae cell immobilization techniques. The variables used are Saccharomyces Cerevisiae cell immobilization concentrations of 15% and 20% (w/v) and fermentation times (1, 2, 3, 4, and 5 days). TKKS that had undergone a delignification process with 10% NaOH was weighed at 15 grams, then hydrolyzed using eco enzyme and fermented together with a nutrient solution and immobilized Saccharomyces Cerevisiae cells. The immobilization of Saccharomyces Cerevisiae cells was carried out using 10% Na-Alginate and 7% CaCl2. The best results were obtained at a cell immobilization concentration of 20% (w/v) and a fermentation time of 3 days, with a bioethanol content of 27.2470% (v/v) and a yield of 23.7910% (w/w). These results indicate that the Saccharomyces cerevisiae cell immobilization technique can increase the efficiency of bioethanol fermentation from TKKS.  
Karakterisasi Senyawa Bioaktif Dari Kulit Buah Naga (Hylocereus spp). Untuk Aplikasi Masker Rambut Nurhalizah Tolla Ts, Siti; Sinardi, Sinardi
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).23084

Abstract

Hair damage is not a trivial problem, because hair health is an important issue for women because it can reduce self-confidence in appearance. The purpose of this study was to determine the composition comparison of dragon fruit skin extract and to determine the feasibility of a hair mask from dragon fruit skin extract to maintain healthy hair and maintain the scalp. The process of making the mask begins by preparing dried dragon fruit skin and extracting it using 70% ethanol as much as 750 mL. The extract results are mixed with the addition of distilled water in various ratios, namely with a volume ratio between dragon fruit skin extract and distilled water of 1: 1, 2: 1, 3: 1, and 4: 1 where 15 mL of dragon fruit skin extract and 15 mL of distilled water, 20 mL of dragon fruit skin extract and 10 mL of distilled water, 22.5 mL of dragon fruit skin extract and 7.5 mL of distilled water, and 24 mL of dragon fruit skin extract and 6 mL of distilled water. Based on the results of the research conducted, dragon fruit skin extract can be formulated as a hair mask preparation, is a homogeneous and stable preparation with an oil-in-water (M/A) emulsion type, has a pH of 6.0, has a viscosity of 2,655 - 4,507 mPa.s, through Cycling Test for 3 cycles there is no change in shape, color and odor so that it is stable for up to 6 days at room temperature, does not cause irritation to hair or scalp, and is suitable for use in the community.
POTENSI TEPUNG TULANG BISON (BISON BISON) SEBAGAI ALTERNATIF BAHAN BAKU PAKAN TERNAK ainun, ainun; Iryani, A. Sry
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).23349

Abstract

Bison bone meal, a byproduct of the bison meat processing industry, has attracted attention as a source of minerals and protein for animal feed. A comprehensive analysis of the nutritional content of bison bone meal is needed to identify its specific advantages as a raw material for animal feed. This study aims to determine the potential of bison bone meal (Bison-bison) as an alternative raw material for animal feed. This study includes sample preparation, calcium analysis using the permanganatometry method, phosphorus analysis using the UV-Vis instrument, and nutritional content using the proximate method for water, ash, fat, and protein content parameters. Bison is a wild ruminant species known for its ability to adapt and survive in harsh environments. Bone meal is a feed raw material produced from animal processing waste. Bison bone meal has a significant mineral content, with a calcium (Ca) concentration ranging from 24-28% and phosphorus (P) 12-14%, creating a Ca:P ratio of around 2:1 which is ideal for animal nutrition. The content of bison bone meal is protein, fat, calcium and phosphorus. However, the main content of bison bone meal with the highest content is protein at 44.90%. The characterization carried out on bison bone meal is the analysis of water and ash content in bison bone meal with the results of the analysis of water content of 4.77% which is lower than the water content in beef bone meal. While the ash content is 37.69% and is greater when compared to beef bone meal. Based on SNI quality standards, each test parameter meets SNI standards. The addition of bison bone meal which is rich in protein and phosphorus to animal feed can improve the quality and productivity of livestock.

Page 1 of 2 | Total Record : 20

 1   2 

Filter by Year

2025 2025


Reset
Filter By Issues
All Issue Vol. 7 No. 2 (2025): Oktober Vol. 6 No. 2 (2024): Oktober Vol. 6 No. 1 (2024): April Vol. 5 No. 2 (2023): Oktober Vol. 5 No. 1 (2023): April Vol. 4 No. 2 (2022): OKTOBER Vol. 4 No. 1 (2022): APRIL Vol. 3 No. 2 (2021): Oktober Vol. 3 No. 1 (2021): April Vol. 2 No. 2 (2020): Oktober Vol. 2 No. 1 (2020): April Vol. 1 No. 2 (2019): Oktober More Issue