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All Journal Jurnal Pendidikan Teknologi dan Kejuruan Jurnal Periodic Jurusan Kimia UNP Sainstek Jurnal Riset Kimia Edu Sains: Jurnal Pendidikan Sains dan Matematika JURNAL EKSAKTA PENDIDIKAN (JEP) JURNAL PENDIDIKAN TAMBUSAI Pelita Eksakta Chemistry Education Practice Jurnal Kimia dan Rekayasa Jurnal Pendidikan IPA Indonesia

Minda Azhar

Unknown Affiliation

Author-ID : 237560

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Pengaruh Penambahan Ekstrak Inulin Umbi Dahlia terhadap Karakteristik Organoleptik Sinbiotik Set Yoghurt Meri Novia Nurman; Minda Azhar; Fitri Amelia; Budhi Oktavia
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Synbiotic set yoghurt with the addition of an extract of inulin from dahlia tubers can increase the functional value of yoghurt. This study aims to determine the effect of inulin addition on the organoleptic characteristics of synbiotic set yoghurt. The method of research was the experimentation method. Synbiotic set yoghurt with the addition of an extract of inulin from dahlia tubers made by variation of the concentrations of 0.1%, 0.3% and 0.5%. Incubation was performed at 37°C for 20 hours . The organoleptic tests were conducted by 15 panelists on the color, aroma and texture of set yoghurt. Organoleptic data was processed using Wilcoxon test with significant level 95% (α = 0.05). Organoleptic set yoghurt showed that the addition of 0.3% inulin significantly affect the aroma of the yoghurt sour and the texture was more dense than the yoghurt comparison. The color of the set yoghurt produced slightly more white than the set yoghurt comparison, but no significant effect on α = 0.05. The results showed that the addition of 0.3% inulin dahlia tuber extract into the set yoghurt had a significantly affect the aroma and the texture of set yoghurt, and did not significantly affect the color of set yoghurt.

Ekstraksi dan Karakterisasi Betasianin dari Kulit Buah Naga Merah (Hylocereus sp.) Rendi Ananda; Minda Azhar
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 1 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Betacyanin is a water-soluble pigmentation compound found in the skin of red dragon fruit. Betacyanin extraction aims to determine the functional group and its maximum wavelength using FTIR and UV-Vis spectrophotometers, respectively. Extraction of betacyanin from dragon fruit peel using ethanol and water in a 1:1 ratio with a stirring speed of 900 rpm for 16 hours. Characterization of betacyanin using FTIR showed betacyanin has an amine group or bond (N-H) derived from betalamic acid which is typical at wave numbers 1798-1607 cm-1. At a wave number of 1486 cm-1 , it shows the presence of C=C strain vibrations from the aromatic ring. Betacyanin characterization using UV-Vis spectrophotometer showed a maximum wavelength of 530 nm.

Sintesis Nanopartikel Magnetik Besi Oksida (Fe3O4) Metode Green Chemistry Dengan Ekstrak Daun Sirih Merah (Piper Crocatum) Rafiqa Khaira; Alizar Ulianas; Minda Azhar; Mawardi Anwar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Magnetic nanoparticles have become an interesting topic in recent years, as magnetic nanoparticles have a greater degree of magnetism, high saturation magnetization, and ease of modification and handling. One of them is the Fe3O4 magnetic nanoparticles which are used in various fields, such as in the biomedical sector which acts as antibacterial, hyperthermia, anticancer, etc. This study aims to synthesize magnetic nanoparticles of iron oxide Fe3O4 using phenolic compounds contained in red betel leaf extract as a styling agent with a co-precipitation method based on green chemistry and to characterize them. The nanoparticles formed were measured for their magnetic force with a gaussmeter and characterized by functional groups, particle size and particle surface morphology using FTIR, XRD and SEM. The data obtained show that the optimal composition for the formation of Fe3O4 nanoparticles is to compare FeCl2: FeCl3 (0.01 mol: 0.02 mol) with a volume of 5 mL of red betel leaf extract which produces a force magnetic 0.16 mT. The characterization by FTIR shows the aromatic groups O-H, C = O carboxylate and C-H which indicate the presence of organic compounds, namely phenolic (gallic acid) which functions as a protective agent (styling agent) of Fe3O4. The XRD test obtained information on the average size of the formed nanoparticles based on the FWHM value (full width at half maximum) using Scherer's equation, which is 26.66 nm. Meanwhile, SEM data shows that the shape or morphology of the Fe3O4 magnetic nanoparticles is needle-like.Keywords — Nanoparticles, iron oxide Fe3O4, green chemistry, red betel leaf extract (Piper Crocatum)

IDENTIFIKASI FRAGMEN GEN 16S rRNA BAKTERI ASAM LAKTAT UBC-DA-08 DARI DADIH Ike Ramadhanty Daniel; MInda Azhar
Jurnal Periodic Jurusan Kimia UNP Vol 8, No 1 (2019): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Bacterial identification can be done by phenotypically and genotypes use the 16S rRNA gene. This study aims to determine the species of lactic acid bacteria isolates in Dadih. The first step of identification of bacteria by screening and isolating lactic acid bacteria found in Dadih, then isolate the bacterial isolate chromosome DNA from screening (UBC-DA-08).Bacterial chromosome DNA was used as a template for amplification of the 16S rRNA gene using the PCR method.Amplikon was electrophoresed using agarose gel and purified for sequencing.Sequencing of the 16S rRNA gene was carried out using the Dideoxy-Sanger method.Sequencing bases of nucleotide sequences were analyzed using the DNAStarprogram.The 16S rRNAgene size ofthe UBC-DA-08 bacterial isolate consisted of 896 bp (base pair).The nucleotide sequence of the 16S rRNA gene can be read using the BLASTn andMEGA programs.The results of identification of UBC-DA-08 bacterial isolates were lactic acid bacteria including the Lactococcuslactis groupKeyword :Dadih, Lactic Acid Bacteria, Gene 16S rRNABacterial identification can be done by phenotypically and genotypes use the 16S rRNA gene. This study aims to determine the species of lactic acid bacteria isolates in Dadih. The first step of identification of bacteria by screening and isolating lactic acid bacteria found in Dadih, then isolate the bacterial isolate chromosome DNA from screening (UBC-DA-08).Bacterial chromosome DNA was used as a template for amplification of the 16S rRNA gene using the PCR method.Amplikon was electrophoresed using agarose gel and purified for sequencing.Sequencing of the 16S rRNA gene was carried out using the Dideoxy-Sanger method.Sequencing bases of nucleotide sequences were analyzed using the DNAStarprogram.The 16S rRNAgene size ofthe UBC-DA-08 bacterial isolate consisted of 896 bp (base pair).The nucleotide sequence of the 16S rRNA gene can be read using the BLASTn andMEGA programs.The results of identification of UBC-DA-08 bacterial isolates were lactic acid bacteria including the Lactococcuslactis group. Keyword :Dadih, Lactic Acid Bacteria, Gene 16S rRNA

EKSTRAKSI DAN KARAKTERISASI KATEKIN DARI GAMBIR (Uncaria gambir roxb) Isriza Mahendra; Minda Azhar
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 1 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Gambir is the result of extraction from the gambier plant (Uncaria gambir roxb) where this plant contains polyphenolic compounds, namely catechins. Catechins are classified as flavanol compounds (flavon-3-ol) and are antioxidant compounds. The aim of the study was to determine the characteristics of the catechins extracted from gambier.Characterization of extracted catechins using FTIR showed characteristic absorption areas for the OH group at the peak of 3000-3700 cm-1 (3307), the C=C group around 1600 cm-1 (1607), and the CO group (1150-1010 cm-1) ( 1017). Characterization of extracted catechins using UV-Vis Spectrophotometer has a maximum wavelength of 290 nm. These characteristics are very similar to standard catechins.

Pengaruh Penambahan Prebiotik Inulin dari Bengkoang (Pachyrhizus erosus) terhadap Organoleptik Sinbiotik Set Yoghurt Fatimah Jora; Minda Azhar; Edi Nasra
Jurnal Periodic Jurusan Kimia UNP Vol 10, No 1 (2021): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Improving the quality of yoghurt can be done by adding prebiotics, known as yoghurt synbiotic sets. This study aims to determinine the effect of adding prebiotic inulin from bengkoang (Pachyrhizus erosus) to the synbiotic organoleptic of yoghurt sets. This research is an experimental research. The yoghurt synbiotic set was made with inulin concentration variations of 0.1%,0.3%,0.5% with an incubation time of 20 hours at 37˚C. Organoleptic data were processed statistically using the Wilcoxon test with a significance level of α=0.05%. Organoleptic test results showed that the addition of 0.3% inulin concentration did not have a significant effect on the sour aroma, white color and solid texture of the yoghurt set compared to without the addition of inulin. The results of wilcoxon analysis at α=0.05 on organoleptic test showed that there was no significant difference in the color, aroma and texture of the yoghurt set.

Efek Crosslinker terhadap Performa Komposit Selulosa Bakteri – Ekstrak Daun Kembang Sepatu ( Hibiscus rosa- Sinensis L ) Egidia Mayendra; Minda Azhar; Indang Dewata; Ananda Putra
Jurnal Periodic Jurusan Kimia UNP Vol 10, No 2 (2021): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Abstract — Bacterial cellulose can be applied in various fields such as biomedical fields, separation membranes, artificial blood vessels, and substrates for tissue engineering cartilage. Bacterial cellulose still has low mechanical properties, so a bacterial cellulose composite with hibiscus leaf extract (KSB-EDKS) is formed to obtain new, better materials. The purpose of this study was to determine the effect of adding starch as a crosslinker, on the mechanical, physical, and structural properties of KSB-EDKS. Bacterial cellulose is produced from a mixture of coconut water, sugar and urea. Then fermented with acetobacter xylinum for 14 days. Bacterial cellulose formed in composites with hibiscus leaves is called bacterial cellulose extract of hibiscus leaves (KSB-EDKS). KSB-EDKS will be characterized by testing tensile strength, moisture content, structural analysis using FTIR and determining the degree of crystallinity using XRD. The addition of a crosslinker can reduce the percentage of KSB-EDKS water content. The best tensile strength test results were KSB-EDKS added with 3% tapioca flour solution with a value of 38.3 MPa, the FTIR spectrum showed that the functional groups in cellulose had just shifted in the range of the same wave number values and for the degree of crystallinity the addition of starch as crosslinker can reduce the degree of crystallinity in KSB-EDKS. Keywords — Bacterial cellulose, Composite, Crosslinker, Hibiscus leaves

Kelarutan CdS dan CuS dalam Gelasi Mikroemulsi Water In Oil Sistem Air, Surfaktan SDBS dan Pentanol Rahmi Fauziah; Minda Azhar; Hary Sanjaya; Ali Amran
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Surfactants are active compounds that act on the surface of a liquid, which can reduce the surface tension between oil and water. The purpose of this study was to determine the solubility of yellow and black inorganic pigments in water in oil microemulsion gelation, which was applied to ballpoint ink. The method used for sol preparation is the gelation method (sol-gel process). The sol gel process is the process of forming inorganic compounds through chemical reactions in solution, and occurs at a temperature of 65oC. The sol gel process undergoes a phase change from the colloid suspension (sol) and finally forms a network called a gel. Dye solubility was observed by the amount of yellow and black inorganic pigment solutes in water in oil microemulsion. The solubility of the yellow pigment is 0.096 grams, while the black pigment is 0.088 grams. To see the density of the pigment, a density test was carried out. The total density produced in yellow inorganic pigment is 0.933 gram / cm3 and black inorganic pigment is 0.914 gram / cm3. Measurement of the refractive index and turbidity (turbidity) to determine the homogeneity of the yellow and black pigments was carried out using an ABBE refractometer and a turbidimeter. The results of the refractive index measurement are associated with pigment solubility, the greater the pigment solubility, the higher the refractive index and turbidity values.

Adsorpsi Zat Warna Methylene Blue Menggunakan Karbon Aktif dari Kulit Durian (Durio zibethinus Murr.) Laura Dwi Rha Hayu; Edi Nasra; Minda Azhar; Sri Benti Etika
Jurnal Periodic Jurusan Kimia UNP Vol 11, No 1 (2022): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v11i1.113349

Methylene blue is a basic dye that has cationic properties and used in the coloring industry. Adsorption using activated carbon from durian peel is proven to be able to absorb methylene blue. This study used the batch method which aims to determine the optimum conditions for absorption and maximum absorption of methylene blue using activated carbon from durian peel (Durio zibethinus Murr.). The absorption stages were carried out by varying the pH (2, 3, 4, 5, and 6) and the concentration. (40, 80, 120, 160, 200, 240 and 280) mg/L. The results showed that the optimum conditions occurred at pH 5 and a concentration of 240 mg/L with an absorption capacity of 28.647 mg/g and an absorption percentage of 99.66%. Mechanism the absorption of methylene blue follows the equation Freundlich isotherm with a determinant coefficient (R2) of 0,9874.

Argument-driven inquiry learning model to improve students' argumentation skills in science learning: systematic literature review Melta, Defrian; Azhar, Minda; Yohandri, Yohandri; Arsih, Fitri; Razak, Abdul
Edu Sains: Jurnal Pendidikan Sains & Matematika Vol 12, No 1 (2024): VOLUME 12 NOMOR 1 JUNI 2024
Publisher : IAIN Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23971/eds.v12i1.5843

This research aims to identify and describe the Argument-Driven Inquiry (ADI) learning model to improve students' argumentation skills in science learning. The method used in this research is the Systematic Literature Review (SLR) method. From the search strategy results, 75 articles were found from 2017 to 2023, then selected gradually and systematically into 20 articles relevant to the topic of the ADI model in science learning. The analysis of journal article reviews based on SLR proves that the ADI learning model can be implemented using various learning media and significantly influences students' argumentation abilities in science learning. Apart from that, this argumentation ability also provides improvement for students who have different academic abilities. The ADI model can also improve other skills, such as understanding concepts, critical thinking, and learning outcomes.

Co-Authors Abdul Razak Abdul Razak Ali Amran Alizar Ulianas Alizar Ulianus Ananda Putra Anni Faridah Ardiansyah, Alexander Budhi Oktavia DESSY NATALIA Devita Efri Dwi Putri, Dola Edi Nasra Egidia Mayendra Fajriah Azra Fatimah Jora Fitri Amelia Fitri Arsih Guspatni Guspatni Hary Sanjaya Ike Ramadhanty Daniel Indang Dewata Iryani Iryani Isriza Mahendra Jamsari Jamsari Khairani - Khairani - Laura Dwi Rha Hayu Maâ€™a, Yustini Mawardi Anwar Melta, Defrian Mentari, Berhias Meri Novia Nurman Miftahul Khair Minda Azhar Muhammad Farhan Mukhaiyar, Riki Munita, Azizah Nizar, Umar Kalmar Novriansyah, Edo Nur Hikmah Pernadi, Niza Lian Prarazuwa, Salsabila Putra, Ananda Putri, Selvi Apriliana Rafiqa Khaira Rahmi Fauziah Rahmi Holinesti Rahmi, Fathaniah Raviqa Randa Sagita Regita Putri, Olivia Rendi Ananda Sabrina, Joya Sagita, Randa Sherly Kasuma Warda Ningsih Sri Benti Etika Sumaryati Syukur Suryelita, Suryelita Umar Kalmar Nizar Vegi Kurnia Navida Vovien - Yohandri Yohandri Bow Yustini Maâ€™a Zulhendra, Zulhendra

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