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Diana Rakhmawaty Eddy
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran Jl. Raya Bandung Sumedang km 21 Jatinangor, Sumedang, 45363, Indonesia
Chemistry

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Microencapsulation of Lime Peel Essential Oils (Citrus aurantifolia) with Complex Coacervation Methods using Gelatin/Sodium Alginate Coating Sandra Puspita; Diana Rakhmawaty Eddy; Tatang Wahyudi; Euis Julaeha
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 6, No. 1, May 2020
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v6i1.14618

Abstract

Lime (Citrus aurantifolia) peel essential oils are complex metabolites mainly used as natural preservatives. The principal constituents include d-limonene, β-pinene, and terpineol. Moreover, essential oils (EOs) are potentially known volatile and unstable compounds, hence, they require proper packaging techniques, e.g., microencapsulation. The purpose of this study is to evaluate the binary methods of lime peel essential oils microencapsulation using complex coacervation. This involves the application of gelatin and sodium alginate coatings under two specific conditions, termed core/coating ratio 1:1.2, with modified stirring and core/coating ratio 1:2.0, with stirring speed of 600 rpm, respectively. The results showed the EOs preparation generated 0.70% yield characterized by good quality, fresh aroma, and pale-yellow coloration. Also, microcapsules delivered 37.06% yield, 39.18% oil content, 31.53% encapsulation efficiency (EE), and less smooth-edged SEM surface under condition I. Meanwhile, condition II demonstrated 51.46% yield, 58.66% oil content, 92.04% encapsulation efficiency (EE), and flat-curved, SEM surface. Furthermore, it was carefully observed condition II produced more superior microcapsules
The Use of Rice Husk Silica in Modified Zinc Oxide Photocatalysts to Reduce Chromium Concentration Diana Rakhmawaty Eddy; L Ahmad Na’ani; Rustaman Rustaman; Solihudin Solihudin
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 6, No. 1, May 2020
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v6i1.12324

Abstract

Rice husk ash contains approximately 90-98% dry weight of silica and they have been reported to have several advantages compared to mineral silica. One of these is its application as a filler in ZnO photocatalysts using the sol-gel method. This study was, therefore, conducted to determine the effect of adding rice husk silica to increase the ability of ZnO/SiO2 photocatalyst to reduce chromium concentration. Meanwhile, a previous effort has been made to degrade methylene blue dyes by 89%. This current research involved preparing rice husk charcoal using pyrolysis tubes after which they were extracted to produce silica while ZnO/SiO2 composites were made at a 95/5, 90/10, and 85/15 (w/w) ratio and composite activity test was conducted to determine its ability to reduce chromium concentration from practicum discharge. The SEM-EDS results showed the formation of SiO2 composites in ZnO while 82.6% decrease in total chromium concentration from waste was obtained after 2 hours irradiation with 95/5 composites using ultraviolet radiation.
Co-Authors Euis Julaeha L Ahmad Na’ani Rustaman Rustaman Sandra Puspita Solihudin Solihudin Tatang Wahyudi