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All Journal Al-Kimia Chimica et Natura Acta
Amalyah Febryanti
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Environmental Science Materials Science & Nanotechnology

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Seleksi Sel Bakteri Dari Minyak Bumi Sebagai Molekul Pengenal Dalam Biosensor Benzena Alfiah Alif; Dyah Iswantini; Henny Purwaningsih; Novik Nurhidayat; Amalyah Febryanti
Al-Kimia Vol 9 No 2 (2021): DESEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v9i2.24378

Abstract

Benzene is one of the harmful compounds which can affect both healthcare and environmental quality. Conventionally the effort of detecting this compound still requires several sample pre-treatments, contributing to a long analysis time and sophisticated instrumentation. Therefore, this study was aimed to determine the potency of bacteria as the bioreceptor for detecting benzene electrochemically. The bacteria isolate was immobilized on the working electrode surface. Four bacteria isolates from the petroleum sample were evaluated. The results showed that isolate II produced high oxidation and reduction peak currents as much as 150 µA and -490 µA respectively. The selected bacteria showed characteristics to Pseudomonas sp. physiologically. Since the bacteria can degrade benzene, thus hypothetically it can produce benzene dioxygenase. Through the catechol formation, 3 mM benzene produced 108.7 µA after 11.4 s from the starting scan. This result suggested that the excreted enzyme from the selected bacteria could react with benzene enzymatically.
Karakterisasi Enzim Amilase Isolat Bakteri R2M Larva Kumbang Sagu dari Luwu Utara Maswati Baharuddin; Nur Alfina; Amalyah Febryanti; Fitria Azis; Wulan Wahyuningsih
Chimica et Natura Acta Vol 10, No 2 (2022)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v10.n2.37334

Abstract

Karakterisasi ekstrak kasar enzim amilase isolat bakteri R2M dari larva kumbang sagu telah dilakukan. Penelitian ini bertujuan untuk mengetahui aktivitas enzim amilase pada suhu, pH, dan konsentrasi substrat optimum terhadap substrat amilum murni dan amilum dari kulit singkong. Penentuan aktivitas enzim amilase menggunakan metode asam 3,5-dinitrosalisilat (DNS) yang diukur dengan spektrofotometer visible pada panjang gelombang (λ) 540 nm. Hasil penelitian menunjukkan bahwa enzim amilase isolat bakteri R2M larva kumbang sagu yang direaksikan dengan substrat amilum optimum pada suhu 70°C, pH 4, dan konsentrasi substrat 1,25% dengan aktivitas enzim masing-masing sebesar 0,116 U/mL; 0,049 U/mL; dan 0,044 U/mL. Aktivitas enzim amilase isolat bakteri R2M larva kumbang sagu yang direaksikan dengan substrat pati kulit singkong pada kondisi optimum (pH 4, suhu 70 °C, dan 1,25% amilum) sebesar 0,077 U/mL. Dengan demikian, enzim amilase isolate R2M yang diisolasi dari larva kumbang sagu mampu bekerja optimum pada konsentrasi substrat 1,25%; suhu 70°C, dan pH 4.
Co-Authors Alif, Alfiah Dyah Iswantini Fitria Azis Henny Purwaningsih Maswati Baharuddin Novik Nurhidayat Nur Alfina Wulan Wahyuningsih