Jurnal FKIP UNTAD
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Potential Antioxidant Activity in Octyl p - Methoxycinnamate (OPMC) Compound Synthesized by Sonochemical Method
No full textmic acid (PMCA) which is reacted with octanol in an acidic condition. OPMC has a substituted benzene group at the para position and conjugated at the carbonyl group. The method used to synthesize OPMC compounds is an esterification reaction with the help of ultrasonic waves at a sonication temperature of 60 0C for 4 hours. The synthesized compounds were then subjected to organoleptic tests, thin layer chromatography tests, solubility tests, melting point tests, FTIR - ATR, and GC - MS. The results showed that the OPMC results were in the form of fine white crystals. The qualitative test was carried out using thin-layer chromatography (TLC) showing an Rf value of 0.65 using n-hexane: ethyl acetate (4:1) eluent. OPMC synthesized is soluble in ethanol, methanol, chloroform, and ether and insoluble in water. The percentage yield of OPMC synthesized 55.72 % Melting point test with melting point apparatus showed that octyl p - methoxycinnamate started to melt at 50 0C. Analysis using FTIR - ATR showed 2919 and 2851 cm-1 (C - H alkyl) The absorption of the extended C=O ester group was at 1692 cm-1 close to the C=O ester (1712 cm-1). C=C group of alkenes and aromatics (1636, 1603, 1573, and 1510 cm-1). The stretching of the C-O ester group at wave number 1252 cm-1, Absorption for the stretching of the C-O ether group at wave number 1170 and 1167 cm-1. The wave number of 820 cm-1 indicates the presence of an aromatic group substituted at the para position. Tests with GC - MS found an abundance of compounds with 97.52 % base peak 290 m/z. Synthesized OPMC compounds have activity as a strong antioxidant with an IC50 value of 96.092 ppm
Synthesis of Fluorescent Carbon Dots from Soybean Residuals Using Hydrothermal Method
No full textSoybean residuals are biowaste composed of carbon chains and amine groups bounded in peptide linkages. The component was identified through FTIR analysis which showed the vibration of the diamide bond (N=C=N) at wave number 2132cm-1. Owing to the existence of these components, soybean has the potential to be used as a precursor to synthesize carbon nano-material, such as Carbon Dots (C - Dots). In this study, the synthesis of C - Dots material from soybean residuals was carried out using the facile hydrothermal method at a temperature of 200 oC for 6 hours. Afterward, the as-synthesized C - Dots were analyzed for their optical property, structure, and morphology. Based on the analysis of the UV - Vis and photoluminescent spectra, C - Dots exhibited absorbance peaks of 292 nm and 301 nm in the UV light region, and fluorescence emission peaks of 468 nm, with blue luminescence characteristics. The observation was supported by the morphological analysis using the HR - TEM, C - Dots exist in a spherical shape with an average particle size of 3.467 nm and a lattice distance of 0.363 nm. Besides, the C - Dots exhibited a good quantum yield of 28.15 %. From the results of the analysis, it is known that the synthesis of C - Dots material has been successfully carried out with particle size < 10 nm
Morphological Effect on Swelling Behaviour of Carboxymethyl Cellulose–Maleic Acid Hydrogel Modified with Kombucha Bacterial Cellulose
No full textThe incorporation of bacterial cellulose from kombucha tea in carboxymethyl cellulose / maleic acid (CMC / MA) hydrogels has been successfully conducted. This study aims to analyze the relationship between the pores on the surface of the hydrogel with their water-absorbing ability. Bacterial cellulose from kombucha (KBC) was confirmed by the spectrum of OH, C-O-C, and C-OH functional groups with FT - IR analysis. Filler KBC was added to CMC / MA hydrogel with variations in the concentration of 2, 4, 6, and 8 % wt. The CMC / MA / KBC hydrogels were characterized by swelling test, degree of crosslinking, FTIR, and SEM. The swelling results showed that hydrogels with 2 % KBC produced the best water absorbing ability up to 172 %, water absorption decreased with the increase of KBC concentrations. Furthermore, SEM image results showed that the addition of KBC affects the morphological shape and pore size of the hydrogel. Meanwhile, FTIR analysis showed that there were no major changes in the functional groups of hydrogels
SPF Activity Sunscreen Spray Gel Ethanol Extract of Cinnamon Bark (Cinnamomum burmanii Ness. BI, Syn)
No full textThis cinnamon bark contains cinnamaldehyde, which is a secondary metabolite compound derived from aldehydes, including the polyphenolic group, which activity as a sunscreen and antioxidant by absorbing UV rays, so it can protect the skin from direct sun exposure (sunscreen). The study aimed to determine whether there was an effect of the concentration of the ethanol extract of cinnamon bark (Cinnamomum burmanii Ness. BI, Syn) on the physical characteristics and SPF value of spray gel preparations and to determine the concentration of the ethanol extract of cinnamon bark that produced spray gel with physical characteristics and SPF value. best. The study was conducted by extracting cinnamon bark by the maceration method using 96 % ethanol for 3 days. The extract obtained was then subjected to phytochemical screening TLC and then applied to a spray gel preparation with concentrations of FI (10 %), FII (15 %), and FIII (20 %), followed by testing the activity of sunscreen using the UV-Vis spectrophotometry method. The results of phytochemical screening and TLC on the ethanol extract of cinnamon bark showed positive results for containing flavonoids, alkaloids, tannins, steroids, and antioxidants. The statistical test results showed that there was a difference with a sig value of 0.05. It was concluded that the ethanol extract of cinnamon bark affected pH, viscosity, spreadability, stickiness, drying time, and SPF value. The formula that gave the best physical characteristics and SPF value was found in the concentration of sunscreen spray gel: the ethanol extract of cinnamon bark with a concentration of FIII (20 %)
PENERAPAN MODEL PEMBELAJARAN DIRECT INSTRUCTION BERBANTUAN VIRTUAL LABORATORY UNTUK MENINGKATKAN HASIL BELAJAR PESERTA DIDIK DAN RETENSINYA PADA MATERI GERAK PARABOLA DI SMA NEGERI 1 PALOH
Full text linkPenelitian ini bertujuan untuk mengetahui pengaruh penerapan model pembelajaran direct instruction berbantuan virtual laboratory terhadap hasil belajar peserta didik dan retensinya pada materi gerak parabola di SMA Negeri 1 Paloh. Bentuk penelitian yang digunakan adalah pre-experimental design dengan rancangan One Group Pretest Posttest yang sudah dimodifikasi. Teknik pengambilan sampel menggunakan sampling jenuh dengan menjadikan semua peserta didik kelas XI IPA sebagai sampel. Tes dalam penelitian ini berjumlah 15 butir yang terdiri dari 12 butir soal pilihan ganda dan 3 butir soal uraian. Hasil penelitian menunjukkan bahwa terdapat perbedaan hasil belajar peserta didik sebelum dan sesudah menerapkan model pembelajaran direct instruction berbantuan virtual laboratory. Selain itu, tingkat retensi peserta didik secara individual memperoleh nilai persentase retensi yang paling rendah yaitu 73% dengan kategori retensi tinggi, kemudian untuk persentase retensi yang paling tinggi yaitu 122% dengan kategori retensi sangat tinggi. Sedangkan persentase retensi peserta didik secara klasikal sebesar 96% dengan kategori sangat tinggi. Oleh karena itu, dapat disimpulkan bahwa penerapan model pembelajaran direct instruction berbantuan virtual laboratory berpengaruh terhadap hasil belajar peserta didik dan retensinya pada materi gerak parabola di SMA Negeri 1 Paloh
PENGARUH MODEL DISCOVERY LEARNING TERHADAP KEMAMPUAN LITERASI SAINS SISWA KELAS VIII SMP NEGERI 1 BANAWA SELATAN
No full textPenelitian ini dilakukan dengan tujuan untuk mengetahui ada tidaknya pengaruh model discovery learning terhadap kemampuan literasi sains siswa kelas VIII SMP Negeri 1 Banawa Selatan. Jenis penelitian ini merupakan eksperimen kuasi dengan equivalen pretest-posttest group design. Populasi penelitian ini adalah seluruh siswa kelas VIII SMP Negeri 1 Banawa Selatan pada tahun ajaran 2021-2022. Teknik sampel yang digunakan dalam penelitian ini adalah purposive sampling. Sampel penelitian ini adalah kelas VIII A sebagai kelas eksperimen dan kelas VIII C sebagai kelas kontrol dengan jumlah siswa masing-masing kelas sebanyak 21 orang. Instrumen tes kemampuan literasi sains yang di gunakan dalam bentuk pilihan ganda. Sebelum di gunakan telah divalidasi melalui validator ahli. Hasil tes kemampuan literasi sains siswa diperoleh skor rata-rata pada posttest yaitu 11,29 untuk kelas eksperimen setelah diberi perlakuan dan 9,81 pada kelas kontrol menerapkan model direct instruction. Hasil penelitian dan analisis data yang diperoleh, bahwa terdapat pengaruh model discovery learning terhadap kemampuan literasi sains siswa kelas VIII SMP Negeri 1 Banawa Selatan. Berdasarkan hasil analisis uji mann whitney U diperoleh nilai Asymp.Sig. (2-tailed) yaitu 0,002. Hal ini berarti nilai α (0,002) < 0,05. Hal ini berarti nilai α berada diluar daerah penerimaan H0. Dengan demikian H0 ditolak dan H1 diterima, yang berarti ada pengaruh model discovery learning terhadap kemampuan literasi sains siswa kelas VIII SMP Negeri 1 Banawa Selatan
PENGARUH KEMANDIRIAN BELAJAR DAN PERHATIAN ORANG TUA TERHADAP HASIL BELAJAR MATEMATIKA SISWA MADRASAH ALIYAH NEGERI DI KOTA PALU PADA MASA PANDEMI COVID 19
Full text linkPenelitian ini bertujuan untuk membuktikan pengaruh kemandirian belajar dan perhatian orang tua terhadap hasil belajar matematika siswa Madrasah Aliyah Negeri Kota Palu pada masa pandemi covid 19. Metode yang digunakan dalam penelitian ini adalah metode survei dengan menggunakan analisis korelasional. Sampel diperoleh dengan menggunakan teknik simple random sampling sebanyak 333 orang siswa dari siswa kelas XI Madrasah Aliyah Negeri di Kota Palu. Pengumpulan data dilakukan dengan menggunakan pemberian angket. Analisis data dilakukan dengan menggunakan bantuan program SPSS 26 terdiri dari analisis deskriptif, uji persyaratan analisis data, dan pengujian hipotesis. Uji persyaratan analisis data yang digunakan, yaitu uji normalitas, uji linearitas, dan uji multikolinearitas. Berdasarkan hasil penelitian didapatkan kesimpulan bahwa: (1) Terdapat pengaruh positif yang signifikan kemandirian belajar terhadap hasil belajar matematika; (2) Terdapat pengaruh positif yang signifikan perhatian orang tua terhadap hasil belajar matematika; dan (3) Terdapat pengaruh positif yang signifikan antara kemandirian belajar dan perhatian orang tua terhadap hasil belajar matematika. Besar sumbangan kemandirian belajar dan perhatian orang tua terhadap prestasi belajar matematika sebesar 36.9% sisanya sebesar 63.1% disumbang oleh variabel-variabel lain selain kemandirian belajar dan perhatian orang tua
PROFIL BERPIKIR KRITIS SISWA DALAM MENYELESAIKAN SOAL PISA KONTEN CHANGE AND RELATIONSHIP DI KELAS VIII MTsN 2 KOTA PALU
Full text linkPenelitian ini bertujuan memprofilkan berpikir kritis siswa yang berkemampuan matematika tinggi, sedang dan rendah dalam menyelesaikan soal PISA konten change and relationship di kelas VIII MTsN 2 Kota Palu. Jenis penelitian adalah penelitian deskriptif dengan pendekatan kualitatif. Subjek penelitian adalah 3 orang siswa kelas VIII MTsN 2 Kota Palu yang berkemampuan matematika tinggi, sedang dan rendah. Hasil penelitian menunjukkan bahwa: (1) Berpikir kritis siswa yang berkemampuan matematika tinggi dalam menyelesaikan soal PISA konten change and relationship yaitu merencanakan dan melakukan eksperimen dengan investigasi yang baik, berpikiran terbuka dan memperhatikan alternatif lain untuk menyelesaikan soal, mendefinisikan istilah dengan cara yang sesuai konteksnya, menarik kesimpulan dari penyelesaian soal secara lisan dan tertulis, menjalin interaksi dengan orang lain serta mengevaluasi hasil pekerjaannya. (2) Berpikir kritis siswa yang berkemampuan matematika sedang dalam menyelesaikan soal PISA konten change and relationship yaitu mengembangkan dan mempertahankan tindakan dalam menyelesaikan soal dengan menggunakan rumus, berpikiran terbuka dan memperhatikan alternatif lain untuk menyelesaikan soal, menarik kesimpulan dari penyelesaian soal secara lisan, serta mengevaluasi hasil pekerjaannya. (3) Berpikir kritis siswa yang berkemampuan matematika rendah dalam menyelesaikan soal PISA konten change and relationship yaitu mengembangkan dan mempertahankan tindakan dalam menyelesaikan soal dengan menggunakan rumus serta mengevaluasi hasil pekerjaannya
Cross-Sectional Survey: The Influence of Various Teacher Backgrounds on West Kalimantan Chemistry TPACK Teachers
No full textThis study aims to examine teachers' perceptions of their Technological Pedagogical and Content Knowledge (TPACK) about age, gender, length of teaching, work location, teacher status, teacher education, and certification programs. This study used a cross-sectional survey method used in non-experimental quantitative research. The population in this study were all chemistry teachers in West Kalimantan using a purposive sampling technique obtain 70 to respondents from 14 districts. The survey consisted of 28 statement items and distributed questionnaires via Google form to chemistry teachers. Chemistry teachers rated themselves on a 5-point scale. All domains of the TPACK framework demonstrated valid and reliable instruments on Pearson's correlation values and Cronbach's Alpha Kruskal Wallis non-parametric test, Pearson's correlation was performed to analyze the data. Significant differences can be seen in the CK domain when viewed from gender differences with a p for CK of 0.044, so there is a significant difference between the gender of women (Mean = 4.08 SD = 0.416) and men (Mean = 4.32 SD = 0.470). Location of work affects the teacher's TCK and TPACK because there is a significant difference when viewed from the p namely the TCK and TPACK of 0.036 and 0.025. Perceptions of teachers' TPACK abilities were greater for teachers in cities than in villages in both the TCK domain (Mean = 3.58; 3.82 SD = 0.430; 0.466) and TPACK (Mean = 3.63; 3.91 SD = 0.483; 0.554)
Analysis of Calcium (Ca) and Potassium (K) Contents in Tin Fruits (Ficus carica Linn)
No full textTin Fruits (Ficus carica Linn) are typical Middle Eastern plants that have been cultivated in Indonesia. Tin fruits are rich in minerals, especially calcium and potassium. In addition, they also contain benzaldehyde which is beneficial against cancer cells. This study aimed to determine the concentrations of calcium and potassium contained in tin fruits. Determination of calcium and potassium contents using an atomic absorption spectrophotometer (AAS). The results showed an analysis of the water content of the sample obtained was 89.065 %, ash content was 1.0165 % and biomass content was 9.9185 %. While the analysis of calcium contents at a wavelength of 422.7 nm and potassium at a wavelength of 766.5 nm respectively obtained that an average yield of calcium was 354.97 mg/100g and 752.68 mg/100g for potassium. The results of this study are expected to be able to attract the interest of the community to cultivate tin fruits, especially in Central Sulawesi