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All Journal Al-Kimia JMM (Jurnal Masyarakat Mandiri) Jurnal Jejaring Matematika dan Sains Community Empowerment CHEDS: Journal of Chemistry, Education, and Science Cipasung Techno Pesantren: Scientific Journal Jurnal Sains Materi Indonesia Ulil Albab
Hermayantiningsih, Dwi
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Religion Arts Humanities Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Economics, Econometrics & Finance Education Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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Study of the Effect of Domestic Wastewater from Jalan Lele Residents of Palangka Raya City on the Acidity and Alkalinity Levels of the Receiving Water Body: Studi Pengaruh Air Limbah Domestik Penduduk Jalan Lele Kota Palangka Raya terhadap Kadar Asiditas dan Alkalinitas Badan Air Penerima Manurung, Tety; Natalia, Nasa; Suma, Joy Angel Aria; Purba, Abed Nego; Naiya, Naiya; Hulu, Dominique F.S.; Rosmainar, Lilis; Hermayantiningsih, Dwi
Jurnal Jejaring Matematika dan Sains Vol. 5 No. 1 (2023): Jurnal Jejaring Matematika dan Sains
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jjms.2023.v5.i1.805

Abstract

This research aims to determine the impact of domestik waste water disposal produced by residents living on Jalan Lele, Palangka Raya City, on the value of acidity and alkalinity levels in the receiving water body. The acidity level obtained was 24.098 mg/L and the alkalinity level was 254.410 mg/L. The acidity levels not comply to the Government Regulation Number 20 of 1990 levels and Government Regulation Number 82 of 2001 for standart water quality type B. Similarly for alkalinity levels doesn’t comply to World Heal Organization Regulation 2011 for irrigation water. Based on the results ​​of high levels of acidity and alkalinity in receiving water bodies, it encourages further research to be carried out for monitoring and handling domestik waste in residential areas in the city of Palangka Raya.
A Studi Kasus: Analisis Laju Korosi Terhadap Berbagai Jenis Paku Hakim, Muh. Supwatul; Hermayantiningsih, Dwi; Nainggolan, Yuni; Sugiyani, Tina; Simbolon, Wenika; Yuneta; Silalahi, Anasthasya
Cipasung Techno Pesantren: Jurnal Ilmiah Vol 18 No 1 (2024): Cipasung Techno Pesantren: Scientific Journal
Publisher : LPPM Sekolah Tinggi Teknologi Cipasung

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Abstract

Abstract— This research aims to determine the corrosion rate of different types of nails by immersing them in water of the same quality. The method used is weight loss method. Each nail was immersed in water for 1–7 days and then weighed every day. The highest corrosion rate was obtained for steel nails with an average corrosion rate of 0.09 mmpy and the lowest corrosion rate was obtained for wall nails with an average corrosion rate of 0.02 mmpy. The largest difference in nail weight after soaking was for the umbrella nail at 0.48 grams, while the smallest difference in nail weight was for the wall nail at 0.11 grams.
Empowering Talian Kereng Village farmer groups through independent organic fertilizer production based on local resources for sustainable agriculture Rosalina, Reny; Hermayantiningsih, Dwi; Priyadi, Muhammad; Decenly, Decenly; Putri, Alayya Adistia; Sametri, Ni Wayan Septia
Community Empowerment Vol 10 No 2 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.12340

Abstract

Talian Kereng Village, located in Katingan Hilir District, Central Kalimantan, faces challenges regarding the availability of fertilizers for upland rice farmers on peatlands, with a heavy reliance on government-subsidized chemical fertilizers. To address this issue, a community empowerment program was implemented to promote independent organic fertilizer production using local resources. The program involved education and training for the Maju Bersama farmer group on the production of decomposers, liquid organic fertilizer (eco enzyme), and compost from household waste and harvest residues. The results showed a significant increase in knowledge, where initially, 53.9% of participants had limited understanding of decomposer and eco enzyme production, but after the training, 95.3% of participants fully comprehended the material. Furthermore, all participants became skilled in producing organic fertilizers. This program is expected to enhance farmers' self-sufficiency in meeting fertilizer needs, reduce dependence on chemical fertilizers, and support agricultural sustainability in Talian Kereng Village.
PREPARASI DAN IDENTIFIKASI GARAM TEMBAGA(II): SINTESIS [Cu(NH₃)₄]SO₄·H₂O SEBAGAI GARAM KOMPLEKS DAN [CuNH₄)₂(SO₄)₂·6H₂O SEBAGAI GARAM RANGKAP Hermayantiningsih, Dwi; Hakim, Muh. Sunwatul; Manurung, Tety Wahyuningsih; Fiqih, Irvan Maulana; Zahra, Laila
CHEDS: Journal of Chemistry, Education, and Science Vol 9, No 1 (2025)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v9i1.11335

Abstract

Penelitian ini bertujuan untuk membandingkan sintesis dan karakterisasi garam kompleks tetra amina tembaga(II) sulfat monohidrat ([Cu(NH₃)₄]SO₄·H₂O) dengan garam rangkap kupri amonium sulfat heksahidrat ([Cu(NH₄)₂(SO₄)₂·6H₂O]). Metode sintesis melibatkan kristalisasi dari larutan tembaga(II) sulfat pentahidrat (CuSO₄·5H₂O) dengan amonia berlebih untuk garam kompleks, dan pencampuran stoikiometris dengan amonium sulfat ((NH₄)₂SO₄) untuk garam rangkap. Hasil sintesis menunjukkan bahwa garam kompleks berwarna biru tua karena transisi elektronik d-d pada ion [Cu(NH₃)₄]²⁺ dengan geometri bidang persegi, sedangkan garam ganda berwarna biru muda karena lingkungan oktahedral [Cu(H₂O)₆]²⁺. Uji kelarutan dan stabilitas terhadap air suling dan NH₃ pekat mengungkapkan bahwa garam kompleks lebih rentan terhadap perubahan pH, menghasilkan endapan coklat tua (Cu⁰) saat dipanaskan, sedangkan garam ganda tetap stabil dengan warna biru muda yang persisten. Hasil sintesis garam ganda mencapai 91,765%, lebih tinggi daripada garam kompleks (75,804%), karena stabilitas termodinamika dan ketahanan terhadap disosiasi. Studi ini menyoroti perbedaan mendasar dalam sifat fisikokimia kedua senyawa, yang relevan untuk aplikasi bahan berbasis tembaga dalam industri dan kimia koordinasi.
Isolation and Characterization of Amylolytic Bacteria From Peatlands Area in Central Kalimantan Nafisah, Zahrotun; Riana Dewi, Syahrani; Ayu Andhita, Naswa; Elya Resha, Enjel; Oksal, Efriyana; Ayu Pratika, Remi; Hermayantiningsih, Dwi
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Peatlands in Central Kalimantan, Indonesia, are ecologically significant due to their acidic, organic-rich conditions, yet their microbial communities remain underexplored, particularly regarding their enzymatic potential. This study aimed to isolate and characterize amylolytic bacteria from peat soil collected at a depth of 143–150 cm in the LAHG CIMTROP area of Central Kalimantan. A total of 44 bacterial isolates were obtained using serial dilution and the gridding method. Screening for amylase activity identified isolate ENS31 as having the highest activity, shown by a clear halo on starch agar. ENS31 was further subjected to biochemical characterization and enzyme activity assays. The amylase enzyme exhibited optimal activity at pH 7 and 50°C, with a specific activity of 3.5 U/mg, and retained activity up to pH 12 (2 U/mg). These results indicate that ENS31 produces an enzyme stable in alkaline conditions despite originating from an acidic environment, demonstrating potential for industrial applications requiring pH and temperature-tolerant biocatalysts. This study contributes to understanding the functional diversity of peatland microbes and highlights tropical peat ecosystems as promising sources of novel enzymes.  
PEMBERDAYAAN KADER NASYIATUL AISYIYAH KALIMANTAN TENGAH MELALUI PELATIHAN PEMBUATAN PRODUK WEDANG UNGU SEBAGAI MINUMAN KESEHATAN Pratika, Remi Ayu; Nafisah, Zahrotun; Pratiwi, Endah Yusma; Hermayantiningsih, Dwi; Hakim, Muh. Supwatul
JMM (Jurnal Masyarakat Mandiri) Vol 9, No 4 (2025): Agustus
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jmm.v9i4.31744

Abstract

Abstrak: Indonesia memiliki kekayaan sumber daya alam berupa tanaman lokal yang berpotensi dikembangkan sebagai produk minuman kesehatan, seperti bunga telang, sereh, dan jeruk nipis. Pemanfaatan tanaman lokal ini penting untuk meningkatkan nilai tambah serta pemberdayaan ekonomi masyarakat. Kegiatan pengabdian ini bertujuan untuk meningkatkan hardskill dan softskill kader Nasyiatul Aisyiyah Kalimantan Tengah melalui pelatihan pembuatan produk wedang ungu. Kegiatan dilakukan dengan metode ceramah, praktik langsung (hands-on training), dan diskusi interaktif. Mitra kegiatan adalah 25 orang kader NA Kalimantan Tengah yang aktif dalam unit usaha NA Corner. Evaluasi kegiatan dilakukan melalui angket pretest dan posttest serta wawancara peserta untuk menilai peningkatan pengetahuan dan keterampilan. Hasil evaluasi menunjukkan terjadi peningkatan pengetahuan dan keterampilan peserta hingga 100% pada seluruh indikator, dengan kepuasan peserta terhadap kegiatan mencapai 77%. Kegiatan ini berdampak positif dalam menumbuhkan semangat kewirausahaan berbasis kearifan lokal.Abstract: Indonesia is rich in natural resources, including local plants with potential as health drinks, such as butterfly pea, lemongrass, and lime. Utilizing these plants is important for increasing added value and empowering the local community. This community service activity aimed to enhance both hardskills and softskills of Nasyiatul Aisyiyah cadres in Central Kalimantan through training in the production of wedang ungu (purple herbal drink). The activity was carried out using lectures, hands-on training, and interactive group discussions (FGD). The partners involved were 25 female cadres from Nasyiatul Aisyiyah who are active in the NA Corner business unit. Evaluation was conducted using pretest-posttest questionnaires and participant interviews to assess knowledge and skill improvement. The results showed a 100% increase in participants' knowledge and skills, with 77% of participants reporting high satisfaction with the program. This activity had a positive impact on fostering local wisdom-based entrepreneurship among women.
Recent Progress on Colorimetric Sensor for Hg(II) Detection Hakim, Muh. Supwatul; Hermayantiningsih, Dwi; Wahyuningsih Manurung, Tety; Ariefin, Mokhamat; Roil Bilad, Muhammad
Jurnal Sains Materi Indonesia Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2025.8937

Abstract

Mercury (Hg) contamination presents significant effects on human health and the environmental, particularly caused by its bio-accumulative and neurotoxic properties. Effective detection of Hg(II) is essential for monitoring and mitigating its impact. Among various detection methods, colorimetric sensors have developed into a promising solution due to their affordability, simplicity, and real-time detection capabilities. This review summarizes recent advancements in colorimetric sensors for Hg(II) detection, focusing on innovative materials such as silver nanoparticles (AgNPs), gold nanoparticles (AuNPs), paper-based substrates, agarose biopolymers, and carbon dots (CDs). AuNPs and AgNPs are highlighted for their unique optical properties and sensitivity, enabling visible detection through surface plasmon resonance changes. Paper-based sensors offer portability and low-cost solutions, while agarose serves as a stable biopolymer matrix for immobilizing detection agents. CDs, with their tunable fluorescence properties and green synthesis potential, provide a biocompatible option for hybrid sensing systems. Despite significant progress, challenges such as stability, selectivity in complex matrices, and scalability of green synthesis remain. Future research should focus on integrating these sensors into portable platforms and enhancing their performance for field applications. This review underscores the critical role of innovative materials and sustainable techniques in advancing mercury detection technologies
Artikel Review: Pengembangan Kemosensor Fluoresensi Berbasis Turunan Piridin untuk Deteksi Formalin dalam Sampel Makanan Hermayantiningsih, Dwi
ULIL ALBAB : Jurnal Ilmiah Multidisiplin Vol. 3 No. 8: Juli 2024
Publisher : CV. Ulil Albab Corp

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/jim.v3i8.4669

Abstract

Diperlukan metode deteksi formalin yang mudah dan akurat karena banyaknya kasus ditemukannya kandungan formalin dalam produk pangan olahan yang dijual dipasaran. Konsumsi bahan makanan yang mengandung formalin dalam jangka panjang, dapat merusak hati, ginjal, limpa, pankreas, otak, dan menyebabkan kanker. Salah satu cara pengidentifikasian formalin adalah menggunakan kemosensor yang telah dirancang secara khusus untuk mendeteksi formalin dengan berdasar interaksi antara analit dan molekul sensor. Senyawa turunan piridin memiliki orbital terkonjugasi yang dapat ditambahkan kromofor atau gugus fluorofor menyebabkan perubahan sinyal optik jika terjadi interaksi dengan substrat. Hasil studi menunjukkan bahwa tiga jenis senyawa turunan piridin yang telah diintesis dapat dijadikan sebagai kemosensor. Kemosensor 4-fenil-2,6-bis (4-aminofenil) piridin (ChP-0), 3,3'-(4-(2-amino-4,5-dimetoksifenil) piridin-2,6-diil) dianilin (ChP) dan 3'-(4-(3,4-dimetoksifenil) piridin-2,6-diil) dianilin (ChP-2A) menunjukkan tingkat pendeteksian yang cepat dan efisien untuk formalin. Senyawa ChP-0, ChP, dan ChP-2A dapat mendeteksi formalin dalam sampel dengan sistem deteksi berupa fluoresen dan/atau kolorimetri berwarna biru.
Co-Authors Ayu Andhita, Naswa Decenly, Decenly Elya Resha, Enjel Fiqih, Irvan Maulana Hakim, Muh. Sunwatul Hakim, Muh. Supwatul Hulu, Dominique F.S. Lilis Rosmainar Manurung, Tety Mokhamat Ariefin Muhammad Priyadi Nafisah, Zahrotun Nainggolan, Yuni Naiya, Naiya Natalia, Nasa Oksal, Efriyana Pratiwi, Endah Yusma Purba, Abed Nego Putri, Alayya Adistia Remi Ayu Pratika Reny Rosalina, Reny Riana Dewi, Syahrani Roil Bilad, Muhammad Sametri, Ni Wayan Septia Silalahi, Anasthasya Simbolon, Wenika Sugiyani, Tina Suma, Joy Angel Aria Tety Wahyuningsih Manurung Wahyuningsih Manurung, Tety Yuneta Zahra, Laila