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INDONESIA
Indonesian Journal of Mathematics and Natural Sciences
Published by Universitas Negeri Semarang
ISSN : -     EISSN : 27747832     DOI : https://doi.org/10.15294/jm
Core Subject : Education,
Other
Final decision of articles acceptance will be made by Editors according to reviewers comments. Publication of accepted articles including the sequence of published articles will be made by Editor in Chief by considering sequence of accepted date and geographical distribution of authors as well as thematic issue.
Arjuna Subject : Ilmu Sosial - Ilmu Sosial (Lain-Lain)
Articles 22 Documents
 1   2   3 
Pengaruh Konsentrasi Gum Arabic Terhadap Karakteristik Fisik Tinta Sablon Kertas Berbasis Pigmen Alami Ekstrak Kunyit (Curcuma Longa L.) Melalui Metode Ultrasound-Assisted Extraction (UAE) Kiki Listia Akansha; Sahiba Sahila; Heribertus Rudi Kusumantoro
Indonesian Journal of Mathematics and Natural Sciences Vol. 49 No. 1 (2026): Volume 49 Nomor 1 April 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jm.v49i1.50193

Abstract

Penggunaan pewarna sintetis dalam industri sablon menghasilkan limbah kimia yang sulit terurai, sehingga pigmen alami seperti kunyit (Curcuma longa L.) berpotensi dikembangkan sebagai alternatif tinta ramah lingkungan. Namun, tinta berbasis pigmen alami memiliki kelemahan pada stabilitas fisik sehingga diperlukan penambahan bahan pengikat seperti gum arabic. Pembuatan tinta dilakukan dengan mencampurkan ekstrak kurkumin dengan gum arabic. Metode ekstraksi kurkumin dilakukan menggunakan Ultrasound-Assisted Extraction (UAE) dengan pelarut etanol 96%, kemudian diformulasikan menjadi tinta dengan variasi konsentrasi gum arabic 0%, 2,5%, 5%, 7,5%, dan 10% (w/v) pada kertas kraft 150 GSM. Parameter yang diuji meliputi pH, kadar padatan, serta lightfastness melalui pengukuran nilai density dan L*a*b*. Hasil penelitian menunjukkan bahwa formulasi tinta optimal diperoleh pada konsentrasi gum arabic 10% dengan nilai pH 4,26, kadar padatan 14,96%, density 0,82, dan nilai ΔE sebesar 9,976 yang mengindikasikan peningkatan stabilitas warna setelah paparan cahaya. Dengan demikian, penambahan gum arabic meningkatkan stabilitas fisik dan kualitas warna tinta sablon berbasis ekstrak kunyit.
Preparation and Characterization of Potato Peel Starch-Based Bioplastic Using Different Starch and Gelatin Concentrations Sarah Nur Amanah; Rachmah Nanda Kartika; Yoga Putra Pratama
Indonesian Journal of Mathematics and Natural Sciences Vol. 49 No. 1 (2026): Volume 49 Nomor 1 April 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jm.v49i1.54697

Abstract

Conventional plastic packaging has contributed significantly to environmental pollution due to its non-biodegradable nature. One promising alternative is potato peel starch-based bioplastic, which utilizes agricultural waste as a renewable raw material for biodegradable packaging. This study aimed to produce and characterize potato peel starch-based bioplastic with different starch and gelatin concentrations by evaluating its thickness, water absorption, solubility, and moisture content. Bioplastics were prepared using the solution casting method with starch concentrations of 3, 5, and 7 g and gelatin concentrations of 0, 0.5, and 1 g. Other materials used included glycerol as a plasticizer, chitosan, acetic acid, distilled water, and peppermint oil. The resulting bioplastics were characterized by measuring thickness, water absorption, solubility, and moisture content. The results showed that the bioplastics had thickness values ranging from 0.182 to 0.542 mm, water absorption of 52.37-82.15%, solubility of 23.68-39.84%, and moisture content of 13.94-18.92%. In general, increasing the concentrations of starch and gelatin tended to reduce water absorption, solubility, and moisture content, indicating the formation of a denser and more stable polymer matrix. The P7G1 formulation (7 g starch and 1 g gelatin) exhibited the most favorable characteristics, with the lowest water absorption, solubility, and moisture content. Therefore, this formulation has the potential to be further developed as an environmentally friendly bioplastic packaging material

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