Mugiyanti Mugiyanti
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Sekip Utara, P.O. Box Bls. 21, Yogyakarta 55281

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SPECTROPHOTOMETRIC DETERMINATION OF PYROCATHECOL AND PYROGALLOL BASED ON THEIR REDOX REACTION WITH IRON(III)/PHENANTHROLINE SYSTEM Mudasir, Mudasir; Mugiyanti, Mugiyanti; Hadipranoto, Ngatidjo
Indonesian Journal of Chemistry Vol 2, No 3 (2002)
Publisher : Universitas Gadjah Mada

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Abstract

An analytical method for the spectrophotometric determination of some phenolic compounds, i.e.: pyrocathecol and pyrogallol based on their redox reaction with iron(III)-phenanthroline complex has been developed. These two compounds, in appropriate conditions, reduce iron(III)-phenanthroline complex to yield very stable and color-intense complex of iron(II)-phenanthroline, [Fe(phen)2]2+, whose concentration is equivalent to the amount of pyrocathecol or pyrogallol in the solution, and is easily detected by spectrophotometric method. Some parameters influencing the sensitivity of the determination were optimized. These included maximum absorption wavelength, pH of the solution, time and temperature of heatingand reagent to analyte minimum mole-ratio. Using the optimum conditions obtained, the analytical performance of the method was examined and the developed method was then applied to analyzed pyrocathecol and pyrogallol contents in several river water of Yogyakarta, Indonesia. Result of the study showed that the optimum conditions for the determination of pyrocathecol are as follows: maximum absorption wavelength (lmax) at 510 nm, pH of the solution = 4, heating time = 120 min, heating temperature = 70 0C and the minimum mole ratio of reagent to analyte is 8. On the other hand, the optimum conditions for the determination of pyrogallol are as follows: maximum absorption wavelength (lmax) at 510 nm, pH of the solution = 5, heating time = 90 min, heating temperature = 90 0C and the minimum mole ratio of reagent to analyte is 7. At the corresponding conditions of analysis, calibration curves for pyrocathecol and pyrogallol are linear in the range concentration of 0.00 - 0.16 ppm and 0.00 - 0.24 ppm, respectively. The correlation coefficients for both compounds were found to be higher than 0.998 and the detection limits went down below 0.07 ppm. It has been demonstrated that the developed method can be applied for the determination of pyrocathecol and pyrogallol contents in natural samples.   Keywords: Spectrophotometry, phenolic compounds, 1,10-phenanthroline, redox reaction
Analisis Naratologi Cerpen Mihime Karya Ermawan, Ermawan; Fitriana, Rina; Mugiyanti, Mugiyanti
Idea | Sastra Jepang Vol 1, No 1 (2019): Volume I, Nomor I, Januari 2019
Publisher : Idea | Sastra Jepang

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Abstrak Penelitian ini penulis menganalisis menggunakan metode naratologi strukturalisme dengan mempertimbangkan aspek–aspek formal, aspek–aspek bentuk, yaitu unsur–unsur karya sastra. Penulis menggunakan metode ini karena ingin mengetahui hubungan sebab akibat yang dilakukan actan dan acteurs yaitu manusia semu yang dibentuk oleh tindakan dalam sebuah struktur naratif. Analisanya menggunakan teori gabungan struktur naratif antara teori sintaksis A.J Greimas dan teori semantik Tzvetan Todorov serta menafsir pandangan pengarang apa saja yang terkandung dalam cerpen, dalam hal ini  termasuk di dalamnya menafsir tentang pesan pengarang, kalimat konotasi, kaitan fakta dengan kehidupan yang ada dan menemukan nilai-nilai kehidupan yang disampaikan oleh pengarang. Penelitian ini bersifat tematik, yaitu bertujuan untuk mengetahui wacana cerita. Penelitian ini mengambil berbagai sumber seperti buku kajian sastra dan buku-buku teori tentang strukturalisme.Kata kunci     : Analisis sintaksis, analisis semantik dan pandangan pengarang 
Analisis Identitas Gender Tokoh Utama Dalam Drama Onna Nobunaga Anugerah, Bima; Rukhyana, Budi; Mugiyanti, Mugiyanti
Idea | Sastra Jepang Vol 1, No 1 (2019): Volume I, Nomor I, Januari 2019
Publisher : Idea | Sastra Jepang

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ABSTRAK Penelitian ini membahas tentang identitas gender tokoh utama drama Onna Nobunaga. Identitas gender merupakan pendefinisian dirinya sendiri akan kesadarannya sebagai laki-laki atau perempuan. Objek penelitian ini adalah melalui tokoh utama yaitu Oda Nobunaga yang mempunyai peran sebagai laki-laki bernama Nobunaga, dan perempuan sebagai Ocho. Objek penelitian ini adalah identitas gender dalam tokoh utama. Sumber data penghasilan didapatkan dari drama Onna Nobunaga melalui naskah bahasa Inggris dan Jepang.Kata kunci : Identitas gender, stereotip gender, Oda Nobunaga, Ocho