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All Journal Jurnal Periodic Jurusan Kimia UNP Biomedika Jurnal Progres Kimia Sains Jurnal Administrasi Pendidikan Indonesia Communications in Science and Technology Chemistry Indonesian Journal of Chemical Research JURNAL PENDIDIKAN TAMBUSAI Eksakta : Berkala Ilmiah Bidang MIPA Pelita Eksakta Indonesian Journal of Chemical Science and Technology SECONDARY : Jurnal Inovasi Pendidikan Menengah (JIPM) Entalpi Pendidikan Kimia BIOCHEPHY: Journal of Science Education CHEDS: Journal of Chemistry, Education, and Science Verstek Journal of Educational Sciences MASALIQ: Jurnal Pendidikan dan Sains Entalpi Pendidikan Kimia Chimica Didactica Acta : Journal of Chemistry and Chemistry Education Journal of Global Research Education Jurnal Pendidikan MIPA
Desy Kurniawati
Jurusan Kimia FMIPA Universitas Negeri Padang
Religion Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Other

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Characterization of Molecularly Imprinted Polymers (MIPs) as Cholesterol-Absorbing Materials Nadia, Nadia; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 6 No. 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49367

Abstract

Molecularly Imprinted Polymer (MIP) membranes as cholesterol absorbers have been successfully synthesized. MIP membranes can absorb cholesterol molecules because they have cavite (pores) and active groups that are selective and sensitive to cholesterol molecules. MIP membranes are synthesized from butyl acrylate monomers, cross-linkers, ethylene glycol dimethacrilate (EGDMA), initiators of 2- 2-dimethoxy-2-phenylacetophenone (DMPP, sodium dodecyl sulfate (SDS) as surfactants, and cholesterol as templates. MIP membranes are synthesized using photopolymerization irradiated with UV light. The results obtained in the form of powder solids can be characterized using UV-Vis spectrophotometry. The results obtained by UV-Vis spectrophotometry showed that the MIP membrane prepared a standard curve with a linear regression equation y = 0.0054x-0.007 with a value of R2 = 0.9982. This suggests that MIP membranes are selective and sensitive to analytes. At optimum absorption of the MIP-cholesterol membrane can absorb cholesterol molecules in the amount of 0.020 grams of cholesterol composition within 20 minutes
Characterization of Silica Nanoparticles from Pumice as an Aerogel Adsorbent Hidayah, Rahma; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 6 No. 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49368

Abstract

Pumice is often found around the banks of rivers, this stone is a type of igneous rock formed from volcanic eruptions. One of the compounds contained in pumice is silica. Therefore, the synthesis of silica nanoparticles from pumice using the sol gel method was used because it is simpler and more efficient in terms of cost and processing time. the initial step was by reacting pumice powder and NaOH at 70°C - 80°C then synthesized by adding 2M HCI to form a gel or white precipitate, soaking in ethanol, teos, hexane solutions was then synthesized to become an aerogel. Silica synthesis results into silica aerogels were characterized by FTIR and XRF. From FTIR silanol and siloxane functional groups were found, and the SiO2 composition increased to 93,299% after synthesis.
Characterization of Silica Nanoparticles from Pumice as an Aerogel Adsorbent Hidayah, Rahma; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 7 No. 1 (2024): JANUARY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i1.56435

Abstract

Pumice is often found around the banks of rivers, this stone is a type of igneous rock formed from volcanic eruptions. One of the compounds contained in pumice is silica. Therefore, the synthesis of silica nanoparticles from pumice using the sol gel method was used because it is simpler and more efficient in terms of cost and processing time. the initial step was by reacting pumice powder and NaOH at 70°C - 80°C then synthesized by adding 2M HCI to form a gel or white precipitate, soaking in ethanol, teos, hexane solutions was then synthesized to become an aerogel. Silica synthesis results into silica aerogels were characterized by FTIR and XRF. From FTIR silanol and siloxane functional groups were found, and the SiO2 composition increased to 93,299% after synthesis.
Effect of Contact Time and Stirring Speed on Biosorption of Lead (II) Using Sugarcane Bagasse Pasaribu, Nur Rizky; Kurniawati, Desy
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 7 No. 1 (2024): JANUARY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i1.56443

Abstract

Lead is a hazardous and toxic metal if it reaches human organs in sufficient doses or if it is present in water. Pb2+ can build up in the brain, causing cancer, disorders of nerve cells, kidneys and mental health as well as problems with male reproduction and resulting in bone irregularities in children. As a result, it is vital to regulate the presence of this metal in water. Biosorption is a heavy metal removal technique that use biomass as an adsorbent. The biosorption method was conducted in this study employing sugarcane bagasse as an adsorbent and batch contacting. Variations in contact duration and stirring speed were tested in this study to determine the influence of contact time and stirring speed on the biosorption process. The study's findings revealed that a contact duration of 60 minutes and a stirring speed of 100 rpm were the best conditions in this research.
Improving the Skills of Posyandu Cadres in Processing Nipah Fruit into Nutrient-Rich Functional Foods to Prevent Stunting in Katapiang Village, Batang Anai District, Padang Pariaman Regency Iryani, Iryani; Iswendi, Iswendi; Kurniawati, Desy; Amelia, Fitri; Suryani, Okta; Parbuntari, Hesty; MAIDA, MARGARITA CLAUDYA; Rivaldo, Ifan
Pelita Eksakta Vol 8 No 2 (2025): Pelita Eksakta, Vol. 8, No. 2
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol8-iss2/302

Abstract

Stunting remains a major public health issue in Indonesia, including in Padang Pariaman Regency, where the prevalence reached 28.3% in 2021 and declined to 19.4% in 2023. Efforts to prevent stunting require a community-based approach that utilizes local resources, one of which is the nipa palm fruit (Nypa fruticans), known for its high nutritional content and potential as functional food. This Community Service Program (PKM) aimed to enhance the knowledge and skills of Posyandu cadres in Nagari Katapiang in processing nipa fruit into nutritious and economically valuable food products. The methods included nutrition education, dissemination of information on nipa fruit potential, and training on appropriate technology for processing nipa into food products such as jam, nuggets, and meatballs. Evaluation was carried out through pre- and post-activity questionnaires. The results showed a significant increase in cadres’ knowledge of nipa’s nutritional content (from 20% to 100%) and health benefits (from 30% to 100%). Perceptions of nipa’s role in stunting prevention also increased from 25% to 95%. Furthermore, practical skills in producing nipa jam improved, where all participants who had never tried before were able to produce processed products after the training. Thus, this PKM activity successfully enhanced the knowledge and practical skills of Posyandu cadres, while demonstrating the potential of nipa fruit as a local food innovation supporting stunting prevention efforts.
Processing Used Cooking Oil into Economically Valuable Products as an Effort to Utilize Household Waste for the Istiqomah Majlis Taklim Women in Korong Olo Bangau Nagari Ketaping Batang Anai District Kurniawati, Desy; Dewata, Indang; Fadhilah, Fadhilah; Mulia, Melindra; Ningsih, Sherly Kasuma Warda; Veronita, Silvi; Marlini, Rahmida; Fatmawati, Rani
Pelita Eksakta Vol 8 No 2 (2025): Pelita Eksakta, Vol. 8, No. 2
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol8-iss2/315

Abstract

Nagari Ketaping in Batang Anai District has great potential for culinary tourism, especially through traditional fried snack vendors such as sala lauak. However, the extensive use of cooking oil in these activities leads to the generation of used cooking oil (jelantah), which poses serious health and environmental risks. Repeated use of the oil produces free radicals and carcinogenic substances that may cause degenerative diseases, while improper disposal into waterways leads to pollution and ecosystem damage. This community service program aims to educate and raise awareness among members of the majlis taklim in Nagari Ketaping about the dangers of used cooking oil and to demonstrate its potential for conversion into economically valuable products. The main participants are housewives who also operate small fried snack businesses. The outcomes include a scientific publication in Pelita Eksakta Journal (FMIPA UNP), a video documentation, and online media dissemination through Berita Minang.
PENGEMBANGAN E-LKPD BERBASIS PROBLEM BASED LEARNING PADA MATERI TATA NAMA SENYAWA KIMIA DAN PERSAMAAN REAKSI KIMIA BERBANTUAN LIVEWORKSHEET SMA Suprawati, Vina; Kurniawati, Desy; Gazali, Fauzana; Fitri, Bali Yana
BIOCHEPHY: Journal of Science Education Vol. 5 No. 2 (2025)
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini mengembangkan E-LKPD berbasis Problem Based Learning pada materi tata nama senyawa kimia dan persamaan reaksi kimia berbantuan Liveworksheet SMA. Penelitian ini menggunakan metode Research and Development (R&D) dengan model pengembangan 4D (Define, Design, Develop, dan Disseminate), namun dibatasi hingga tahap Develop. Instrumen penelitian meliputi angket wawancara guru, angket peserta didik, angket validitas, dan angket praktikalitas. Proses validasi dilakukan oleh tiga dosen Kimia Fakultas Matetamika dan Ilmu Pengetahuan Alam (FMIPA) UNP dan dua guru Kimia SMA Pertiwi 1 Padang untuk menilai kelayakan isi, tampilan, serta kesesuaian E-LKPD dengan tujuan pembelajaran. Hasil validasi pada setiap Tujuan Pembelajaran Harian (TP Harian) menunjukkan rata-rata skor sebesar 0,92, yang termasuk dalam kategori valid. Sementara itu, hasil uji praktikalitas yang melibatkan dua guru kimia dan 30 peserta didik Fase E SMA Pertiwi 1 Padang memperoleh rata-rata nilai 92% dari guru dan 91% dari peserta didik, yang tergolong dalam kategori sangat praktis. Hasil tersebut menunjukkan bahwa E-LKPD yang dikembangkan mudah digunakan, menarik, serta mendukung pembelajaran yang aktif dan berpusat pada peserta didik. Dengan demikian, dapat disimpulkan bahwa E-LKPD berbasis Problem Based Learning berbantuan Liveworksheet pada materi tata nama senyawa kimia dan persamaan reaksi kimia telah memenuhi kriteria valid dan sangat praktis.
VALIDITAS DAN PRAKTIKALITAS APLIKASI MOBILE SEBAGAI MEDIA PEMBELAJARAN PADA MATERI SISTEM PERIODIK UNSUR FASE E SMA/MA Khairurrazak, Khairurrazak; Kurniawati, Desy; Yerimadesi, Yerimadesi
BIOCHEPHY: Journal of Science Education Vol. 5 No. 2 (2025)
Publisher : MO.RI Publishing

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Abstract

Penelitian ini bertujuan untuk mengembangkan aplikasi mobile sebagai media pembelajaran kimia pada materi sistem periodik unsur untuk siswa SMA fasa E yang memenuhi kriteria validitas dan praktikalitas. Penelitian ini menggunakan metode Research and Development (R&D) dengan model Four D (4D) yang meliputi tahap define, design, develop, dan disseminate. Pengumpulan data dilakukan melalui angket validitas dan praktikalitas, kemudian dianalisis menggunakan rumus Aiken's V dan persentase praktikalitas. Proses validasi melibatkan lima validator yang terdiri dari tiga dosen kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Negeri Padang dan dua guru kimia SMAN 1 Nan Sabaris. Uji praktikalitas dilakukan oleh dua guru kimia dan lima belas peserta didik SMAN 1 Nan Sabaris. Hasil penelitian menunjukkan bahwa media pembelajaran yang dikembangkan memiliki tingkat validitas yang tinggi, dengan nilai Aiken's V sebesar 0,976 untuk ahli materi dan 0,962 untuk ahli media. Sementara itu, hasil uji kepraktisan memperoleh skor 95% dari guru dan 94% dari peserta didik, yang termasuk dalam kategori sangat praktis. Dengan demikian, aplikasi mobile yang dikembangkan dinyatakan valid dan praktis untuk digunakan sebagai media pembelajaran kimia.
Biosorption of Indigo Carmine onto Duck Egg White-Modified Longan Peel Biosorbent: Effect of Particle Size and Contact Time Waarsyat, Fadli; Kurniawati, Desy; Etika, Sri Benti; Sari, Trisna Kumala; Husein, Saddam; Jeningsih; Septian Budiman
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 02 (2026): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol27-iss02/665

Abstract

The increasing demand in the textile industry ideally requires effective wastewater treatment systems to prevent environmental pollution. These pollutants are resistant to degradation and pose serious risks to aquatic ecosystems and human health. To address this issue, sustainable and low-cost treatment methods are urgently needed. Biosorption using agricultural waste has emerged as a promising alternative; however its performance is often limited by insufficient active binding sites. Therefore, surface modification using natural protein sources is proposed to enhance adsorption capacity and efficiency. This study aims to develop and evaluate longan peel modified with duck egg white (LP-DEW) as an eco-friendly biosorbent for indigo carmine removal. The effects of particle size and contact time were investigated, and adsorption kinetics were analyzed using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. The results showed that LP-DEW exhibited a maximum adsorption capacity of 128.27 mg g-1 at an optimal particle size of 63 μm and equilibrium time of 90 min. The adsorption process followed the pseudo-second-order model, indicating chemisorption as the dominant mechanism. In conclusion, LP-DEW demonstrates high adsorption efficiency and favorable kinetics, highlighting its potential as a sustainable biosorbent for dye-contaminated wastewater treatment.
PENGEMBANGAN E-LKPD BERBASIS PROBLEM BASED LEARNING BERBANTUAN WEBSITE WIZER.ME PADA MATERI KESETIMBANGAN KIMIA FASE F SMA/MA Rahmah, Suci Adila; Kurniawati, Desy
SECONDARY: Jurnal Inovasi Pendidikan Menengah Vol. 6 No. 3 (2026)
Publisher : Pusat Pengembangan Pendidikan dan Penelitian Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51878/secondary.v6i3.10804

Abstract

This study aims to develop a Problem Based Learning (PBL)-based E-LKPD assisted by the wizer.me website on the topic of chemical equilibrium in the High School/MA phase and to test its validity and practicality. This research is a type of Research and Development (R&D) study using the 4-D development model, which includes the define, design, develop, and disseminate stages, but its implementation is limited to the develop stage. The research subjects consisted of 3 Chemistry lecturers from FMIPA UNP and 2 high school chemistry teachers from SMA Pertiwi 1 Padang as validators, as well as 2 chemistry teachers and 24 students as practicality test respondents. The instruments used include interview sheets, student questionnaires, validation sheets, and practicality questionnaires. The research results indicate that the developed E-LKPD has a validity level with an average Aiken’s V value of 0.90, which is categorized as valid, and a practicality level with average scores of 94% from teachers and 90% from students, placing it in the very practical category. These results show that the developed E-LKPD is easy to use, engaging, and able to support active learning, so it can be concluded that the Problem-Based Learning E-LKPD assisted by the wizer.me website on chemical equilibrium material meets the criteria of being valid and very practical for use in learning. ABSTRAK Penelitian ini bertujuan untuk mengembangkan E-LKPD berbasis Problem Based Learning (PBL) berbantuan website wizer.me pada materi kesetimbangan kimia Fase F SMA/MA serta menguji tingkat validitas dan kepraktisannya. Penelitian ini merupakan jenis penelitian Research and Development (R&D) dengan model pengembangan 4-D yang meliputi tahap define, design, develop, dan disseminate, namun pelaksanaannya dibatasi hingga tahap develop. Subjek penelitian terdiri atas 3 dosen Kimia FMIPA UNP dan 2 guru kimia SMA Pertiwi 1 Padang sebagai validator, serta 2 guru kimia dan 24 peserta didik sebagai responden uji praktikalitas. Instrumen yang digunakan meliputi lembar wawancara, angket peserta didik, lembar validasi, dan angket praktikalitas. Hasil penelitian menunjukkan bahwa E-LKPD yang dikembangkan memiliki tingkat validitas dengan nilai rata-rata Aiken’s V sebesar 0,90 yang tergolong dalam kategori valid, serta tingkat kepraktisan dengan nilai rata-rata sebesar 94% dari guru dan 90% dari peserta didik yang termasuk dalam kategori sangat praktis. Hasil ini menunjukkan bahwa E-LKPD yang dikembangkan mudah digunakan, menarik, dan mampu mendukung pembelajaran yang aktif, sehingga dapat disimpulkan bahwa E-LKPD berbasis Problem Based Learning berbantuan website wizer.me pada materi kesetimbangan kimia telah memenuhi kriteria valid dan sangat praktis untuk digunakan dalam pembelajaran.  
Co-Authors Addawiyah, Nadiyatul Afifi, Rayhanil Afrilia, Yoni Aini, Syamsi Ali Amran Alizar Alizar, Alizar Alkhaira, Nisa Andini, Namira Tri Anjelia, Mariza Arifah Sri Wahyuni Bali Yana Fitri Barkah, Fitri Annisa Benti Etika, Sri Budhi Oktavia Darussalam, Rahni Della Rosalynna Stiadi Dwi Finna Syolendra DWI RAMADHANI Edi Nasra Elsa Yuniarti Elviana Clara Manalu, Volma Em Sutrisna Fadhilah Fadhilah Fariz Adzani, Rivaldo Fatmawati, Rani Fauzana Gazali Fitri Amelia Fitria Ningsih, Rahmadhani Frista, Nada Gama Yoga, Nugroho Hamid, Syafira Putri Haqqu, Annisa Hardeli Hardeli Hardianti, Amirah Salsabila Harmaiyani, Risky Hary Sanjaya Hasyim, Rahmat Heditama, Muhammad Raffi Hidayah, Rahma Holidayani Husna, Miftahul Ideal, Flami Luthfianisa Ifan Rivaldo Ikhsany, Diva Indang Dewata Indasyach Moreno, Zavi Intan Lestari Iqbal, Anwar Iryani Iryani Istiqamah, Siti Sarah Iswendi iswendi Jayawarsa, A.A. Ketut Jeningsih Karmila, Aroma Kartika, Reka Khairurrazak, Khairurrazak Kiki Amelia, Kiki Laily Nurliana Latisma, Latisma Lestari, Kardina Mahmud Mahmud Maida, Margarita Claudya Mardhatillah Nadien, Rahmah Marlini, Rahmida Martha, Rahma Dyan Mawardi Miftahul Khair Muhammad Rayhan Mulia, Melindra Mutia, Nuraini Cut Nadia Nadia Nandi, Mila Lusy Tri Nizar, Umar Kalmar Nofianti, Nora Novela, Riana Nur Fitri Nurhayati Nurhayati Nurrahma, Yashinta Parbuntari, Hesty Pasaribu, Nur Rizky Patricia, Popi Pernadi, Niza Lian Puja, Puja Putra Mustafit, Alvian Putra, Ananda Putri Rinjani, Mitna Sekar Putri, Anisa Dwi Putri, Raisya Pratama Rahadian Zainul Rahmah, Suci Adila Rahmi, Maulidia Arsyta Rantika Putri, Dwi Riga Rio Budi Syaka, Darwin Risnawaty Risnawaty Risty, Chika Mei Romy Dwipa Yamesa Away Rosalinda, Gigih Devy Saddam Husein, Saddam Safitri, Nadila Santoso, S.H., M.Hum, Bambang Sari, Trisna Kumala Sepriyeni Oktavia, Syntia Septian Budiman Sherly Kasuma Warda Ningsih Sri Benti Etika Stiadi, Della Rosalyna Sukarno, Ragil Suprawati, Vina Suryani, Okta Syamsul Arifin Tarmizi, Fadhilah Ulianas, Alizar Veronita, Silvi Waarsyat, Fadli Yeni, Isra Yerimadesi Yohanes Gunawan, Yohanes Yola, Servi Farda Yuranda, Fitri Zakiya, Ratu