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All Journal JURNAL KIMIA SAINS DAN APLIKASI
F. Widhi Mahatmanti
Department of Chemistry, State University of Semarang, Semarang 50221|State University of Semarang|Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

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Kajian Termodinamika Penyerapan Zat Warna Indikator Metil Oranye (MO) dalam Larutan Air oleh Adsorben Kitosan F. Widhi Mahatmanti; Woro Sumarni
Jurnal Kimia Sains dan Aplikasi Vol 6, No 2 (2003): Volume 6 Issue 2 Year 2003
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3945.371 KB) | DOI: 10.14710/jksa.6.2.13-18

Abstract

Telah dilakukan penelitian pada kitosan sebagai adsorben. Adsorben tersebut digunakan untuk mengadsorpsi zat warna indikator Metil Oranye (MO) dalam larutan air. Parameter yang mempengaruhi adsorpsi yaitu energi dan kapasitas adsorpsi dipelajari.Penelitian diawali dengan identifikasi gugus fungsional yang terdapat pada kitosan secara spektrofotometri Infra Merah. Model Isoterm Adsorpsi Langmuir digunakan untuk menetapkan kapasitas dan energi adsorpsi.Hasil penelitian menunjukkan bahwa kapasitas adsorpsi Metil Oranye pada adsorben kitosan adalah sebesar 8,9839 x 10-5 mol/gram kitosan, dan energi adsorpsi adalah 35,8783 KJ/mol.
Pengaruh Derajad Keasaman (pH) pada Kesetimbangan Kompleks Zn(II)-EDTA oleh Adsorben Kitosan F. Widhi Mahatmanti
Jurnal Kimia Sains dan Aplikasi Vol 7, No 2 (2004): Volume 7 Issue 2 Year 2004
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (173.706 KB) | DOI: 10.14710/jksa.7.2.50-54

Abstract

Telah dilakukan penelitian tentang pengaruh derajad keasaman (pH) terhadap kesetimbangan kompleks Zn(II)-EDTA oleh adsorben kitosan. Adsorpsi oleh adsorben kitosan dilakukan pada pH buffer 2-10 dengan wak-tu interaksi 3 hari. Analisis hasil Zn(II)-EDTA yang teradsorpsi digunakan Spektroskopi Serapan Atom (AAS). Hasil penelitian menunjukkan bahwa pada pH = 6, khelat Zn(II)-EDTA mayoritas terdapat dalam dalam bentuk ZnL2- sehingga akan berinteraksi dengan kitosan melalui interaksi elektrostatik menurut persamaan reaksi: RcNH3+ + ZnL2- menjadi RcNH3+ ZnL2-.
Chitosan/Anthocyanin-Based Indicator Film with Carnauba Wax Addition for Monitoring Chicken Freshness Wirda Roichatuttamamah; F. Widhi Mahatmanti; Samuel Budi Wardhana Kusuma; Endah Fitriani Rahayu
Jurnal Kimia Sains dan Aplikasi Vol 28, No 6 (2025): Volume 28 Issue 6 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.6.283-291

Abstract

Indicator films can be applied to food packaging to monitor the quality of food products. However, chitosan/anthocyanin films tend to have low hydrophobicity, which may compromise their performance as indicators and lead to dye migration. One approach to address this issue is by incorporating additional materials such as carnauba wax. This study investigates the effect of carnauba wax addition on the mechanical properties and water contact angle of chitosan/anthocyanin-based indicator films, as well as evaluates the performance of the resulting films in monitoring the freshness of chicken meat. Indicator films were prepared by adding carnauba wax at concentrations of 6, 9, 12, and 15% (w/w of chitosan). The results showed that the addition of carnauba wax improved the mechanical properties of the films, although the improvement was not statistically significant. The best mechanical performance was observed with the 15% wax formulation. Additionally, the water contact angle increased with higher concentrations of carnauba wax, with the highest value (71.630°) observed for the CS/ABT/CW15% film. The indicator films were applied to chicken packaging and evaluated based on color changes during storage as a measure of freshness. After 30 hours, the film color changed from dark brown to green. The color change pattern during storage was similar for films with and without carnauba wax, indicating that the addition of carnauba wax does not affect the film’s ability to monitor chicken freshness.
Co-Authors Endah Fitriani Rahayu Samuel Budi Wardhana Kusuma Wirda Roichatuttamamah Woro Sumarni