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PENGEMBANGAN MODUL PRAKTIKUM MICROSCALE TITRASI ASAM – BASA MENGGUNAKAN SMALL – SCALE CHEMISTRY KIT UNTUK SISWA SMA Putu Virgi Pradnya Widiasri; Ni Made Wiratini; I Wayan Muderawan
Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Vol 9, No 1 (2026)
Publisher : Universitas Islam Kalimantan MAB Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/dl.v9i1.22373

Abstract

Penelitian ini bertujuan untuk mengembangkan modul praktikum microscale titrasi asam-basa menggunakan small-scale chemistry kit untuk siswa SMA. Penelitian menggunakan metode Research and Development dengan model ADDIE yang meliputi tahap analisi, desain, pengembangan, implementasi, dan evaluasi. Subjek penelitian melibatkan dua dosen ahli sebagai validator, satu guru kimia, serta siswa kelas XI SMA Negeri Bali Mandara. Instrumen pengumpulan data berupa angket validitas, keterbacaan, kepraktisan, dan respon siswa. Hasil penelitian menunjukkan bahwa modul praktikum memiliki tingkat validitas sangat tinggi pada aspek isi (0,93), media (0,93), dan bahasa (1,00). Uji keterbacaan menunjukkan kategori terbaca dengan skor rata-rata 4,06. Uji kepraktisan memeperoleh kategori sangat praktis oleh guru (3,7) dan praktis oleh siswa (3,2). Adapun respon siswa terhadap modul sangat positif dengan persentase 99,7%. Dengan demikian, modul praktikum microscale titrasi asam-basa menggunakan small-scale chemistry kit untuk siswa SMA dinyatakan layak dan aplikatif sebagai bahan ajar praktikum kimia di SMA.
ANTIOXIDANT ACTIVITY AND TOXICITY OF THE ETHYL ACETATE AND DICHLOROMETHANE FRACTIONS OF THE ETHANOL EXTRACT OF SIKKAM LEAVES (Bischofia javanica Blume) Putu Widiari; I Wayan Muderawan; Rachmadhani Rachmadhani
Indonesian Journal of Chemistry and Environment Vol. 9 No. 1 (2026): JUNE 2026
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v9i1.97531

Abstract

Sikkam (Bischofia javanica Blume) is traditionally used to treat sore throat, infected wounds, boils, and diabetes, but scientific evidence remains limited. This study aimed to determine the antioxidant activity and toxicity of the ethyl acetate and dichloromethane fractions of sikkam leaf ethanol extract obtained by maceration. Antioxidant activity was assessed using the DPPH method, and toxicity was evaluated using the BSLT method with Artemia salina larvae. The IC₅₀ values of the ethyl acetate and dichloromethane fractions were 4.13 µg/mL and 26.19 µg/mL (both very strong), respectively, while the LC₅₀ values were 1152.99 µg/mL (non-toxic) and 686.61 µg/mL (moderate), respectively. Both fractions demonstrated very strong antioxidant activity, with the ethyl acetate fraction exhibiting greater potential and being non-toxic, whereas the dichloromethane fraction showed moderate toxicity.
Yield, Antioxidant Activity, and Toxicity of Ethanol Extracts from Air- and Sun-Dried Sikkam Leaves (Bischofia javanica Blume) Obtained by Maceration and Soxhlet Extraction I Wayan Muderawan; Nia Astria Br. Saragih; I Wayan Mudianta
Indonesian Journal of Chemistry and Environment Vol. 9 No. 1 (2026): JUNE 2026
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v9i1.97771

Abstract

Sikkam (Bischofia javanica Blume) is a species of the genus Bischofia in the Euphorbiaceae family that can be used as a traditional medicine. This study aimed to determine the yield, antioxidant activity, and toxicity of sikkam leaf extract. Sikkam leaves were dried at room temperature (air-dried) and under direct sunlight (sun-dried). The extracts were obtained using the maceration and Soxhlet extraction methods with 96% ethanol as the solvent. The yields of air-dried (A-D) and sun-dried (S-D) sikkam leaf extracts isolated by maceration and Soxhlet extraction differed significantly (p<0.05), with average values of 20.48±2.30, 22.32±1.19, 24.31±2.01 and 24.71±0.09% for A-D maceration, S-D maceration, A-D Soxhlet extraction, and S-D Soxhlet extraction, respectively. The antioxidant activity (IC50) of sikkam leaf extracts, tested using the DPPH method, showed significantly different mean values (p<0.05), with the following averages: 11.13±1.30, 12.86±2.88, 11.36±1.47, and 14.82±1.19 µg/mL for A-D maceration, S-D maceration, A-D Soxhlet extraction and S-D Soxhlet extraction, respectively. The ethanol extracts of air-dried and sun-dried sikkam leaves isolated via maceration and Soxhlet extraction fall into the category of very strong antioxidant activity. The toxicity (LC50) of the sikkam leaf extracts tested using the Brine Shrimp Lethality Test (BSLT) differed significantly (p<0.05), namely 941±37, 914±67, 985±72 and 700±39 µg/mL for A-D maceration, S-D maceration, A-D Soxhlet extraction and S-D Soxhlet extraction, respectively. Ethanol extracts of air-dried and sun-dried sikkam leaves, isolated by maceration and Soxhlet extraction, are classified as non-toxic.
PENGEMBANGAN MODUL PRAKTIKUM MICROSCALE TITRASI ASAM – BASA MENGGUNAKAN SMALL – SCALE CHEMISTRY KIT UNTUK SISWA SMA Putu Virgi Pradnya Widiasri; Ni Made Wiratini; I Wayan Muderawan
Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Vol 9 No 1 (2026)
Publisher : Universitas Islam Kalimantan MAB Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/dl.v9i1.22373

Abstract

Penelitian ini bertujuan untuk mengembangkan modul praktikum microscale titrasi asam-basa menggunakan small-scale chemistry kit untuk siswa SMA. Penelitian menggunakan metode Research and Development dengan model ADDIE yang meliputi tahap analisi, desain, pengembangan, implementasi, dan evaluasi. Subjek penelitian melibatkan dua dosen ahli sebagai validator, satu guru kimia, serta siswa kelas XI SMA Negeri Bali Mandara. Instrumen pengumpulan data berupa angket validitas, keterbacaan, kepraktisan, dan respon siswa. Hasil penelitian menunjukkan bahwa modul praktikum memiliki tingkat validitas sangat tinggi pada aspek isi (0,93), media (0,93), dan bahasa (1,00). Uji keterbacaan menunjukkan kategori terbaca dengan skor rata-rata 4,06. Uji kepraktisan memeperoleh kategori sangat praktis oleh guru (3,7) dan praktis oleh siswa (3,2). Adapun respon siswa terhadap modul sangat positif dengan persentase 99,7%. Dengan demikian, modul praktikum microscale titrasi asam-basa menggunakan small-scale chemistry kit untuk siswa SMA dinyatakan layak dan aplikatif sebagai bahan ajar praktikum kimia di SMA.
Co-Authors Adiningsih, Made Darmaprathiwi Anggi Priliyanti Bgeholz, Susanne Daiwataningsih, Ni Ketut Prati Darma, I Dewa Gede Abi Dr. I Nyoman Tika,M.Si . Eky, Vicky Enggy Clovidea Indra Fenica, Istiqomah Frieda Nurlita Frieda Nurlita Gede Agus Beni Widana Gede Billy Oktavio Putra Hemayanti, Ketut Lia I Dewa Gede Abi Darma I Gusti Lanang Wiratma I Gusti Ngurah Bayu Sucitra I Gusti Ngurah Bayu Sucitra, I Gusti Ngurah Bayu I Ketut Supir I Komang Wisnu Budi Wijaya I Made Ary Sudiatmika I MADE KARTAMA . I Nyoman Sujana I Wayan Karyasa I Wayan Mudianta I Wayan Rai I Wayan Rai I Wayan Sadia I Wayan Suastra I Wayan Subagia I Wayan Suja Ida Ayu Kade Sastrika Istiqomah Fenica Ketut Lia Hemayanti Laksmi, Pande Putu Diah Suci Luh Lian Pertiwi Luh Mitha Priyanka Luh Putu Renis Ukirsari Made Budiawan Made Darmaprathiwi Adiningsih Made Kurnia Wiastuti Giri Made Kurnia Widiastuti Giri Marthen Reda Boro Matthiesen, Finn Mudianta, I Wayan Muthia Zahra Nabila N. Ramadiyanti Nabila, Muthia Zahra Ni Ketut Prati Daiwataningsih Ni Made Sih Widyasti Ni Made Wiratini Ni Putu Giyan Adnya Antari . NI PUTU MARHENI . Ni Putu Novi Puspitadesi Ni Putu Rahayu Kusuma Pratiwi Ni Putu Wulan Romianingsih Ni Putu Wulan Romianingsih Ni Wayan Martiningsih NI WAYAN NITA ULANTARI . Nia Astria Br. Saragih NUR RAMADIYANTI . Nurlita, Frieda Pertiwi, Luh Lian Pratiwi, Ni Putu Rahayu Kusuma Priliyanti, Anggi Prof. Dr.I Nengah Suparta,M.Si . Puspitadesi, Ni Putu Novi Putra, Gede Billy Oktavio Putu Virgi Pradnya Widiasri Putu Widiari Putu Widiartini Rachmadhani Rachmadhani Ramadiyanti, N. Reda Boro, Marthen Romianingsih, Ni Putu Wulan Siti Maryam Sudiatmika, I Made Ary Ukirsari, Luh Putu Renis Vicky Enggy Clovidea Indra Eky Widiartini, Putu Widyasti, Ni Made Sih Young, David James