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All Journal KOVALEN: Jurnal Riset Kimia Indonesia Chimica Acta Chimica et Natura Acta
Ummi Zahra
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Materials Science & Nanotechnology

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Adsorbsi Metanil Kuning Menggunakan Hidrogel Pati Bonggol Pisang Ambon (Musa paradisiaca var. Ambon) Ummi Zahra; Samsinar Samsinar; Sitti Chadijah; Arfiani Nur
Chimica et Natura Acta Vol 9, No 1 (2021)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v9.n1.34378

Abstract

Limbah industri masih terus menjadi permasalahan, terkait pemanfaatan dan pengolahannya. Salah satu limbah yang sulit untuk diuraikan adalah zat pewarna metanl kuning, Zat tersebut berdampak menganggu ekosistem lingkungan. Penelitian ini bertujuan untuk melakukan asorbsi pada zat pewarna metanil kuning menggunakan hydrogel yang disintesis dari pati bonggol pisang ambon (M. paradisiaca var. Ambon). Metode yang dilakukan pada penelitian ini adalah, ekstraksi pati pada bonggol pisang, sintesis hydrogel, karakterisasi hydrogel menggunakan FTIR dan monitoring adsorbsi zat pewarna metanil kuning menggunakan spektrofotometer  UV-Vis. Hasil penelitian menunjukkan beberpa gugus fungsi antara lain O-H, C-H, N-H dan C-O dan penambahan gugus fungsi N=N and S=O groups pada hidrogel yang telah diadsorbsikan dengan metanil kuning. Adapun penyerapan hydrogel pada konsentrsi 200 ppm menghasikan nilai degradasi sebesar 30,62%. 
Ekstraksi dan Uji Stabilitas Zat Warna Alami dari Biji Buah Pinang (Areca catechu L.) sebagai Bahan Pengganti Pewarna Sintetik pada Produk Minuman: Extraction and Stability Test of Natural Dyes from Areca catechu L. as a Substitute for Synthetic Dyes in Beverage Products St Chadijah; Sari Ningsih; Ummi Zahra; Syarifah Rabiatul Adawiah; Iin Novianty
KOVALEN: Jurnal Riset Kimia Vol. 7 No. 2 (2021): Edisi Agustus
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2021.v7.i2.15541

Abstract

Natural dyes are an alternative dye that is not toxic, environmentally, friendly and easily degraded. Therefore, optimizing the use of body coloring sources is carried out. One of the natural dyes released is tannin from betel nuts. Tannins are polar pigments. This study aims to determine the results of natural dyes in betel nuts and find out the durability produced and known organoleptic results. Dyestuff extraction from betel nuts was carried out with 96% ethanol. Testing the color stability of betel nut seedlings was carried out on the effect of pH, temperature and storage time with the method UV-Vis Spectrophotometer. Then the application of betel nut dyes on beverage products was carried out. The results showed that betel fruit produced tannin dyes in brownish red color with an average tannin content of 28.002 mg/L. Dyes stabilized at pH of 6 by heating at 400C and storage for 2 days. The results of organoleptic tests showed that the extract of areca nut powder can be used as a natural dye in beverage products with a level of color, smell and flavor that emits at a concentration of 0.005 g/mL of dyes. Keywords: Extraction, tannin, areca nuts, color stability, organoleptic
Esterification Reaction of Glycerol to The Derivatives Catalyzed by Amberlyst 36 Aisyah Aisyah; Rezeki Rezeki; Firnanelty Firnanelty; A. Nur Fitriani Abubakar; Ummi Zahra; Iswadi Ibrahim Patunrengi; Arfiani Nur
Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) Volume 14, No 1: June 2021 (In Press)
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/ica.v14i1.12837

Abstract

Several studies reported the use of acid catalysts of esterification of glycerol to acetin derivatives and amberlysts are no exception. However, among these strong sulfuric acid catalysts, amberlyst 36 is still rarely used and hence challenging to investigate. This study aimed to determine the yield and the selectivity of the esterification reaction of glycerol into acetine derivatives using a 5% of solid catalyst amberlyst 36 at a temperature of 90°C in a reflux system. The conversion value resulting from the reaction was 80.74%, with a selectivity value of 6.8% for triacetin. FTIR and GC-MS data support the monoacetin and triacetin structures. The findings indicate that the simple method and easily obtained catalyst can produce a high yield of acetin derivatives. This method is still possibly optimized to perform maximum yield with high selectivity.
Co-Authors A. Nur Fitriani Abubakar Aisyah Aisyah Arfiani Nur Firnanelty, Firnanelty Iin Novianty Iswadi Ibrahim Patunrengi Rezeki Rezeki Samsinar Samsinar Sari Ningsih Sitti Chadijah St Chadijah Syarifah Rabiatul Adawiah