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Yulvia, Ana
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Chemistry

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Isolation and Transformation of Tefrosin From The Seed of Tephrosia Vogelii With SelectfluorTM Yulvia, Ana; Hermawati, Elvira; Danova, Ade; Oktavianawati, Ika; Reza, Muhammad
Indonesian Chimica Letters Vol. 3 No. 2 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v3i2.4274

Abstract

In this study, tefrosin (1), a known phenolic compound, was successfully isolated and identified from the seed extract of Tephrosia vogelii. The structure of this compound was determined based on 1D and 2D NMR spectroscopy. Furthermore, the isolated compound was transformed using 0.5 equivalent of selectfluor™ in acetonitrile solvent at 100 oC for 3 hours. The reaction product, namely dehydrotephrosine (2), is new reaction product from selectfluor™ reagent as a catalyst in tertiary alcohol dehydration in aromatic group. This finding highlights the effectiveness of selectfluor™ as a catalyst in dehydration reactions, demonstrating its potential to introduce new chemical properties to compounds. The study underscores the versatility of selectfluor™ and its ability to facilitate the generation of valuable derivatives from phenolic compounds. These results provide insights into the reactivity of tefrosin and offer a new approach for chemical transformations involving phenolic substrates.
Immobilization of Endo-Β-1,4-D-Xylanase using Alginate/Nanocellulose for Xylooligosaccharide Production Ratnadewi, Anak Agung Istri; Aprilia, Selvina Rizky; Piluharto, Bambang; Yulvia, Ana
Indonesian Chimica Letters Vol. 2 No. 2 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v2i2.5607

Abstract

Free endo-β-1,4-D-xylanase cannot be used more than once, so it needs to be modified by immobilizing the enzyme. Endo-β-1,4-D-xylanase was obtained from termite abdomen sources by isolation, ammonium sulfate purification, and dialysis methods. Endo-β-1,4-D-xylanase was immobilized with an alginate/nanocellulose matrix. This study aims to determine the activity, protein content, and repeated use of immobilized Endo-β-1,4-D-xylanase. This study used variations of Alginate/nanocellulose (0; 2.5; 5; 7.5; 10) %. Protein levels of Endo-β-1,4-D-xylanase were tested using the Bradford method and activity using the Miller method. The total protein bound to the immobilized Endo-β-1,4-D-xylanase was stated with the immobilized yield data. The immobilized yield with the composition of Alginate Nanocellulose (ANC) (0%) was 45.33% greater than the other compositions. Immobilized Endo-β-1,4-D-xylanase activity is efficient. ANC 5% produces an efficiency of 62.384% at the 12th hour, which is greater than the other ANC compositions.
Deployment Pattern of Lead (Pb) in Jenggawah Area, Jember, East Java Asnawati; Mintadi, Mukh.; Budiarto, Maria; Pertiwi, Adriana Kusuma; Ananda, Tinok Dwi; Yulvia, Ana
Indonesian Chimica Letters Vol. 4 No. 1 (2025)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v4i1.5843

Abstract

The damaging effects of lead (Pb) contamination in soil has been significant public health concern, mainly due to its toxicity. Jenggawah district, located in Jember regency, Indonesia, has experienced growing anthropogenic activity in recent years, leading to the necessity to map the prevalence of this dangerous element in this area. Therefore, this research aims to evaluate the spatial and vertical distribution of lead (Pb) contamination level in the soil of the Jenggawah area. The soil samples were collected using random sampling techniques from seven different locations at various distances from the roadside (0, 25 m, and 50 m) and different depths (0, 15 cm, and 30 cm). Then, the soil sample containing lead (Pb) content were extracted through an acid-based destruction and quantified using Atomic Absorption Spectrophotometry. This study explained that lead (Pb) concentrations in all soil samples from the Jenggawah area were below established thresholds (1 - 8 ppm) and consistently reduced with increasing soil depth.   Additionally, the variation of lead content in terms of distance from the roadside revealed a more fluctuating pattern, possibly affected by ground surface conditions and wind factors. In conclusion, these results can provide environmental information and enhance the understanding of heavy metal risks in areas with moderate anthropogenic activity, such as Jenggawah.
Co-Authors Ade Danova Anak Agung Istri Ratnadewi Aprilia, Selvina Rizky Asnawati Bambang Piluharto Budiarto, Maria Hermawati, Elvira Ika Oktavianawati Mintadi, Mukh. Muhammad Reza Pertiwi, Adriana Kusuma Tinok Dwi Ananda