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All Journal Jurnal Kartika Kimia Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) al Kimiya : Jurnal Ilmu Kimia dan Terapan
Widyatama, Satria Aqilla
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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The Utilization of Two Commercial Indonesian Fertilizers as Microalgal Growth Medium for Chlorella pyrenoidosa and Botryococcus braunii Cultivation Widyatama, Awang; Al Fajry, Zaidan; Widyatama, Satria Aqilla; Mulyati, Ade Heri; Stiawan, Elva
Jurnal Kartika Kimia Vol 7 No 1 (2024): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v7i1.252

Abstract

In the current trend of the upstream stage of microalgal bioprocessing studies, many works mainly focused on optimizing microalgal cultivation parameters for obtaining a high yield of either biomass or a particular metabolite. Meanwhile, efforts to alternatively provide affordable growth medium are considered still limited to be performed. This study aims to provide an alternative microalgal growth medium from commercial fertilizers and supplements provided by a particular Indonesian company. Our proposed microalgal growth medium was developed by considering the chemical contents of the products with the essential components of an established Guillard f/2 microalgal growth medium. By employing the developed growth medium in Chlorella pyrenoidosa and Botryococcus braunii cultivation, similar growth profiles were shown in both green microalgae with optimum time for biomass harvesting encouraged within two weeks of cultivation. Regarding biomass productivity, 0.19 g and 0.20 of dried biomass were averagely obtained from 1 L cultures of Chlorella pyrenoidosa and Botryococcus braunii, respectively. This finding implies that two Indonesian fertilizer products could be utilized as the main ingredient of moderate performance of green microalgal growth medium.
Yellow-Flare Performance Improvement of PVC Addition into Mg-Sodium Nitrate-Based Pyrotechics Gunaryo, Gunaryo; Maharani, Anggaria; Budiman, Anggito; Widyatama, Satria Aqilla; Pratita, Elda; Miwazuki, Shella Athaya
Indonesian Journal of Chemical Studies Vol. 3 No. 2 (2024): Indones. J. Chem. Stud., December 2024
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v3i2.60

Abstract

Light pyrotechnics is one strategic defence equipment for civil and military purposes. Additives act as one of the factors that affect the flame in pyrotechnics. Additives were used to slow down the combustion rate so that the flare could burn for a long time without drastically reducing the flame performance of the flare. This study focused on the performance of pyrotechnic flames with variations of PVC as a density-increasing material because it was in the form of a polymer and had high-chlorine content, resulting in a mixture that is difficult to burn. The experiment results exhibited that pyrotechnics without PVC showed intensity with an emission spectrum of 577-585 nm, light intensity of 723-1184 lux, and burning rate of 3.22-3.31 g/s. Increasing the PVC additive composition to 1.5 gr showed emissions with a wavelength of 596-597 nm, decreased intensity from 91-183 lux, and a slower burning rate of 0.72-0.88 g/s. The use of PVC was effectively applied in the 1.76-10.21% fraction and was actively able to slow down the rate of combustion of pyrotechnic mixtures. Hence, PVC could slow down the burning rate and increase density. Adding PVC in yellow pyrotechnics would slow down the burning rate of the pyrotechnic sample with the side effect of reducing the brightness of the yellow color and the intensity of the light.
Biomass Contents Of Chlorella Pyrenoidosa Cultivated In Cobalt-Less Fertilizer-Enriched Saline Water Widyatama, Awang; Widyatama, Satria Aqilla; Fajry, Zaidan Al; Atmadi, Atmadi; Mulyawati, Ade Heri; Stiawan, Elva
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 12 No. 1 (2025): June 2025
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v12i1.39468

Abstract

This research aims to provide some information regarding the metabolite contents of the green microalgae Chlorella pyrenoidosa cultivated in designed saline water enriched with affordable commercial fertilizer products in Indonesia. Chlorella pyrenoidosa growth conditions and bioactive compounds were obtained through cultivation and extraction processes. The microalga growth in two different conditions   was analyzed based on growth curves between microalgae cultivated in a Guillard f/2 medium   and the Cobalt-less fertilizer-enriched saline water.   The biomass was profiled using UPLC-QToF-MS and DPPH assay. As a result, Chlorella pyrenoidosa cultures were normally grown on fertilizer-enriched saline water, but with a lower yield performance than those cultivated in the Guillard f/2 medium. The UPLC-QToF-MS result implies that several peptide and lipid derivatives were detected in the harvested microalgal biomass, with the peptide derivatives as the dominant compounds. The limited antioxidant performance was displayed by the untreated biomass extract. This finding implies that several optimizations are still required in the upstream and downstream stages in culturing Chlorella pyrenoidosa by using an uncommon growth medium.
Co-Authors Ade Heri Mulyati, Ade Heri Al Fajry, Zaidan Anggaria Maharani Atmadi, Atmadi Budiman, Anggito Elva Stiawan Fajry, Zaidan Al Gunaryo, Gunaryo Miwazuki, Shella Athaya Mulyawati, Ade Heri Pratita, Elda Widyatama, Awang