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DESY KURNIAWATI
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Pengembangan e-LKPD Terintegrasi STEM-PjBL pada Materi Asam Basa Kelas XI SMA Menggunakan Flip PDF Proffesional Software Yogi Febrianto; Desy Kurniawati
Entalpi Pendidikan Kimia Vol 4 No 2 (2023)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/epk.v4i2.314

Abstract

Variation of learning media is e-LKPD (electronic Student Worksheet) with Flip PDF Professional. Making e-LKPD is an effort to improve critical thinking skills, understanding concepts and linking the acquired knowledge to real life through integrated learning. The approach that can be used is STEM (Science, Technology, Engineering and Mathematics) which is usually followed by several learning models, one of which is PjBL (Project Based Learning). The purpose of this study was to develop an integrated STEM-PjBL e-LKPD on acid-base material for class XI SMA. This type of research is Research and Development which uses a 4-D development model, define, design, develop, and disseminate. The data analysis used is validity and practicality. The data analysis technique uses Aiken'sV to analyze the validity of the data and Kappa Aiken'sV Cohen to analyze the practicality of the data. The average Aikken'sV validity test scale is 0.85 with a very high validity category. Aikken'sV scale. The practical kappa moment of the teacher's practicality sheet is 0.90 in the very high category and from the student's practicality sheet, 0.82 is in the high category. This shows that the integrated STEM PjBL e-LKPD on acid-base material for class XI SMA which was developed is valid and practical as a learning media.
Pengembangan Kue Bawang Rendah Gluten dengan Substitusi Tepung MOCAF (Modified Cassava Flour) Mesa Saputri; Desy Kurniawati
Jurnal Pendidikan Kimia, Fisika dan Biologi Vol. 1 No. 4 (2025): Juli: Jurnal Pendidikan Kimia, Fisika dan Biologi
Publisher : Asosiasi Riset Ilmu Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupenkifb.v1i4.322

Abstract

Food is a basic need that must be met by every individual. In Indonesia, rice is still the main staple food, but the shift in consumption to rice and wheat which are imported foodstuffs raises concerns about food security. Therefore, the development of local food alternatives such as MOCAF (Modified Cassava Flour) flour from cassava is important. In this practicum, MOCAF flour was made through a cassava fermentation process, followed by making onion cakes using the MOCAF flour. Organoleptic tests and XRF tests were carried out to evaluate the quality of MOCAF flour. The results of the practicum showed that the substitution of MOCAF flour in making onion cakes can produce low-gluten products that have the potential to be a sustainable food alternative.
Adsorpsi Ion Logam Cr (VI) dari Adsorben Karbon Aktif Tongkol Jagung (Zea Mays) Khalisa Khalisa; Fahilatul Syukro; Nuzulia Yona; Putri Nugraha; Edi Nasra; Desy Kurniawati
Jurnal Pendidikan Kimia, Fisika dan Biologi Vol. 1 No. 4 (2025): Juli: Jurnal Pendidikan Kimia, Fisika dan Biologi
Publisher : Asosiasi Riset Ilmu Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupenkifb.v2i4.323

Abstract

The use of Cr (Chromium) in industry and daily life produces toxic waste harmful to humans and the environment. This study aims to evaluate the effectiveness of activated carbon from corn cobs as an adsorbent for Cr(VI) heavy metal. Corn cobs, which contain 40–44% cellulose, were carbonized at 500°C using 6% sodium carbonate and characterized with an IR spectrophotometer. Adsorption tests were conducted by varying pH and contact time to determine optimal conditions. FTIR results revealed functional groups such as C≡C stretch, C=C=C stretch, and C–O bend. After activation, O–H groups appeared, indicating the presence of aromatic compounds, which are typical in activated carbon. The optimum pH for Cr(VI) adsorption was pH 4, with an adsorption rate of 65.35%. The optimum contact time was 60 minutes, resulting in 3.2% Cr(VI) adsorbed and a maximum adsorption capacity of 0.089 mg/g. In conclusion, corn cobs are a promising, eco-friendly, and effective natural material for adsorbing Cr(VI) heavy metal ions.
Kinetika Adsorpsi Zat Warna Metilen Blue Menggunakan Silika Xerogel dari Abu Terbang (Fly Ash) Annisa Haqqu; Edi Nasra; Desy Kurniawati
Jurnal Pendidikan Kimia, Fisika dan Biologi Vol. 1 No. 4 (2025): Juli: Jurnal Pendidikan Kimia, Fisika dan Biologi
Publisher : Asosiasi Riset Ilmu Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupenkifb.v2i4.324

Abstract

Coal is an organic mineral from ancient plant remains that settles and goes through physical or chemical processes over a period of up to millions of years. Coal is used as a source of steam-powered electrical energy through combustion which produces fly ash waste. fly ash contains various chemical materials such as SiO2; Al2O3; Fe2O3. The potential chemical content makes fly ash which can be used as an adsorbent for heavy metals and dyes by forming silica xerogel. To increase the silica oxide content in fly ash, a washing process is carried out with various solvents. Research on the adsorption of methylene blue dye using silica xerogel from fly ash with variations in contact time. The results showed that silica xerogel from fly ash was able to adsorb methylene blue dye at a contact time of 90 minutes. Adsorption kinetics follows a pseudo second order model with an R2 value that is better than pseudo first order. It can be seen that the R2 value respectively shows a linear regression of 0.703 for pseudo first order and 1 for pseudo second order.
Pengolahan Daging Buah Kelapa Menjadi Virgin Coconut Oil (VCO) Shintia Nabila Putri; Desy Kurniawati
Jurnal Pendidikan Kimia, Fisika dan Biologi Vol. 1 No. 5 (2025): September : Jurnal Pendidikan Kimia, Fisika dan Biologi
Publisher : Asosiasi Riset Ilmu Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupenkifb.v1i5.616

Abstract

Virgin Coconut Oil (VCO) is a high-quality coconut oil that is extracted from fresh coconut meat without the use of high heat or chemicals, preserving its natural nutrients and beneficial properties. The demand for VCO has increased in recent years due to its various health benefits, such as boosting the immune system, improving digestion, and providing antimicrobial effects. The oil is rich in medium-chain fatty acids, particularly lauric acid, which is known for its positive effects on cholesterol levels and cardiovascular health. This study focuses on the production of VCO using a natural fermentation method, a traditional technique that is gaining attention for its simplicity and environmental friendliness. In this method, mature coconut meat is grated and squeezed to extract the coconut milk, which is then fermented at room temperature for 24–48 hours. The fermentation process allows the separation of the oil from the milk, forming a clear oil layer on top, which retains the characteristic aroma of coconut. The quality of the produced VCO was analyzed by determining its acid value and saponification number. The saponification value, which indicates the amount of alkali required to saponify the fat, was found to be 50.49. The acid value, which reflects the free fatty acid content, was measured at 5.61. These results suggest that the VCO produced through natural fermentation is of relatively good quality, with a favorable acid value indicating lower rancidity. Overall, the study demonstrates that natural fermentation is an efficient, eco-friendly, and cost-effective alternative for VCO production. This method not only preserves the natural properties of the coconut oil but also offers a sustainable approach to producing high-quality oil for various health and cosmetic applications.
Pembuatan Virgin Coconut Oil (VCO) Menggunakan Metode Penggaraman Dengan NaCl Najla Dhifa Tofanny; Olga Tiara Rizki; Khalisa; Sisri Wartati; Desy Kurniawati; Arif Juliari Kusnanda
Gudang Jurnal Multidisiplin Ilmu Vol. 2 No. 6 (2024): GJMI - JUNI
Publisher : PT. Gudang Pustaka Cendekia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59435/gjmi.v2i6.660

Abstract

Virgin Coconut Oil (VCO) merupakan produk minyak kelapa murni yang proses pembuatannya tidak melibatkan proses pemanasan dan pengerjaannya pun sangat sederhana. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan garam NaCl terhadap hasil dan kualitas VCO. Hasil dari penelitian pada penambahan NaCl berbau minyak kelapa segar sesuai dengan ketentuan SNI. Pada uji bilangan asam didapatkan bahwa hasil analisis bilangan asam sebesar 0,11% pada minyak VCO kontrol maupun dengan penambahan NaCl. Kesimpulan pada perconaan ini diperoleh pada uji organoleptik didapat perbedaan yg signifikan dari kedua variasi, pada uji bilangan asam diperoleh hasil yang sama sebesar 0,11% dan untuk uji terakhir volume dari vco penggaraman lebih banyak dibandingan dengan kontrol.
Formulasi Masker Wajah Organik dengan Kunyit: Studi pH, Kadar Air, dan Aktivitas Antioksidan Suci Nurazmi; Mawardi Mawardi; Desy Kurniawati
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6824

Abstract

This study is motivated by the limited research on the formulation of organic masks using locally sourced natural ingredients such as coffee grounds, rice flour, and turmeric, which hold potential for producing cosmetic preparations with high bioactive efficacy and safety. The objective of this research is to analyze the effect of turmeric addition on the chemical characteristics of organic facial masks made from coffee grounds and rice flour, with a focus on pH level, moisture content, antioxidant activity, and flavonoid content. A quantitative approach was employed through laboratory experiments involving two formulations (with and without turmeric), each tested in triplicate. pH was measured using a digital pH meter; moisture content was determined by the gravimetric method; antioxidant activity was assessed using the DPPH method with a UV-Vis spectrophotometer; and flavonoid content was evaluated qualitatively. The results show that the formulation containing turmeric had a more neutral pH (7.3), lower moisture content (3.11%), higher antioxidant activity (47.50%), and tested positive for flavonoid content. In contrast, the formulation without turmeric had higher moisture content (3.68%) and did not contain flavonoids. The addition of turmeric also influenced drying time, though it remained within an optimal range. The study concludes that turmeric addition significantly enhances the chemical quality and biofunctional activity of the mask, representing an innovative approach to developing herbal cosmetics based on local ingredients.
Optimasi Waktu Kontak dan Kecepatan Pengadukan untuk Penyerapan Ion Cu(II) oleh Biosorben Kulit Matoa-CTAB Meissa Lifangrha Ronald; Desy Kurniawati; Melindra Mulia
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6867

Abstract

Industrial waste containing heavy metal ions such as Cu(II) is a major cause of environmental pollution, posing serious risks to human health and ecosystem sustainability. Cu(II) ions are toxic and can lead to neurological disorders, anemia, liver and kidney damage, and even death upon excessive exposure. To address this issue, an efficient, economical, and environmentally friendly method is needed. This study aims to evaluate the ability of matoa peel as a biosorbent for Cu(II) ion removal and to analyze the effect of surface modification using the cationic surfactant Cetyltrimethylammonium Bromide (CTAB). Matoa peel was selected due to its status as agricultural waste rich in active compounds such as flavonoids, tannins, lignin, and cellulose, which contain functional groups effective in binding metal ions. CTAB modification was applied to enhance the number and strength of active adsorption sites. Characterization was conducted using Fourier Transform Infrared Spectroscopy (FTIR) to identify changes in functional groups, while adsorption tests were performed using Atomic Absorption Spectroscopy (AAS) with variations in contact time and stirring speed. The results indicated optimal conditions at 60 minutes of contact time and a stirring speed of 150 rpm, achieving a maximum adsorption capacity of 15.01 mg/g—significantly higher than that of the unmodified biosorbent. In conclusion, CTAB-modified matoa peel significantly enhances the biosorption effectiveness for Cu(II) ions. These findings support the potential use of agricultural waste as a sustainable, cost-effective biosorbent for environmentally friendly industrial wastewater treatment.
Pengaruh pH dan Kecepatan Pengadukan terhadap Penyerapan Zat Warna Methylene Blue menggunakan Biosorben Kulit Langsat (Lansium domesticum) Termodifikasi Cetyltrimethylammonium Bromide (CTAB) Najwa Annisa Oktaviana; Desy Kurniawati
MASALIQ Vol 5 No 5 (2025): SEPTEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i5.7079

Abstract

Textile dye waste such as Methylene Blue is a hazardous pollutant that is difficult to degrade, thus requiring environmentally friendly treatment solutions. This study aims to utilize langsat peel waste (Lansium domesticum) modified with the cationic surfactant Cetyltrimethylammonium Bromide (CTAB) as a low-cost biosorbent for the removal of Methylene Blue, with a focus on improving adsorption capacity and examining the effects of process variables, namely pH and stirring speed. The langsat peel was prepared, ground to a particle size of 150 µm, and modified with CTAB. Batch adsorption experiments were conducted by varying the pH (2–10) and stirring speed (100–300 rpm). The concentration of Methylene Blue was analyzed using a UV-Vis spectrophotometer. The results showed that the optimal adsorption occurred at pH 6 with a capacity of 5.57 mg/g, while the optimal stirring speed was 200 rpm, yielding the highest adsorption capacity of 17.9 mg/g. These findings demonstrate that CTAB-modified langsat peel significantly enhances its effectiveness as a potential biosorbent for the remediation of Methylene Blue-containing wastewater.
Pengolahan Limbah Organik Kulit Pisang (Musa balbisiana) dan Kubis (Brassica oleracea) menjadi Eco Enzyme Aziza Putri Ana; Desy Kurniawati; Iswendi Iswendi
MASALIQ Vol 5 No 5 (2025): SEPTEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i5.7181

Abstract

The management of household organic waste presents a significant challenge in efforts to promote environmental sustainability. This study aims to utilize banana peels (Musa balbisiana) and cabbage (Brassica oleracea) waste as raw materials for the production of eco-enzyme through a three-month fermentation process using a ratio of 3:1:10 (organic waste:brown sugar:water). The evaluation included organoleptic tests (color and aroma), pH measurement, and qualitative analysis of nitrogen (N), phosphorus (P), and potassium (K) content. The results showed that both eco-enzyme variations exhibited a cloudy brown color, acidic aroma with varying banana peel scent intensity, and a pH of 3, indicating high acidity due to organic acid formation. Qualitative tests confirmed the presence of N, P, and K in both variations. These findings demonstrate the potential of combining banana peels and cabbage to produce eco-enzyme as an environmentally friendly organic fertilizer. Further research is recommended to conduct quantitative analysis to determine nutrient content levels and assess the effectiveness of eco-enzyme application in agricultural practices.
Co-Authors Afrianty Ramadhani Anastasya Tri Yolanda Andreas Difa Annisa Haqqu Arif Juliari Kusnanda Arifah Sri Wahyuni Aysha Famil Hidayah Aziza Putri Ana Budhi Oktavia Deski Beri Edi Nasra Eka Yusmita Em Sutrisna Fahilatul Syukro Fitriani Indah Permai Hardeli Hamzah Hary Sanjaya Isra Yeni iswendi iswendi Khalisa Khalisa Khalisa Mawardi Anwar Mawardi Mawardi Meissa Lifangrha Ronald Mesa Saputri Molsa Vitaloka Putri Mulia, Melindra Munadi Munadi Najla Dhifa Tofanny Najwa Annisa Oktaviana Nuzulia Yona Olga Tiara Rizki Putri Nugraha Rahardian Z Refi Yeni Reviana Ervita Riga Riga Riri Nofrita Romy Dwipa Yamesa Away Shintia Nabila Putri Sisri Wartati Suci Nurazmi Syamsi Aini Trisna Kumala Sari Yerimadesi Yogi Febrianto