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All Journal Program Kreativitas Mahasiswa - Penelitian Greensphere: Journal of Environmental Chemistry
Yulia Milarsih
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang
Biochemistry, Genetics & Molecular Biology Chemistry

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LAPAS ROKOK (LAMPU PENGHILANG ASAP ROKOK) BERBASIS FOTOKATALITIK NANOPARTIKEL ZnO Milarsih, Yulia; Wibowo, Arif Sony; Wuning, Sri; Prasetya, Nor Basid Adiwibawa
Program Kreativitas Mahasiswa - Penelitian PKM-P 2013
Publisher : Ditlitabmas, Ditjen DIKTI, Kemdikbud RI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (617.227 KB)

Abstract

ZnO is a photocatalyst essence that has economical value which can be able to degrade any dangerous organic compound by photocatalytic reaction. The purpose of this research is to fix any problems which are caused by smoke in Indonesia by innovation of smoke-disappeared light based on photocatalyst of  ZnO nanoparticles. The zinc oxide (ZnO) has disadventage which can be initiated only by the UV light, so adding Co(Cobalt) is needed to decrease the gap-energy in order for it can work at visible light. The experiment method was carried out in three steps: (1) synthesis of  ZnO nanoparticles by sol gel method, (2) the veneering was used the spray coating. The result showed that bandgap of  ZnO which doped by Co is 2,28 eV, the size of nanoparticles which layered at the light-glass is about 40 nm, and can reduce CO until 3.69 ppm or 793,35 x 1019 particles for 10 minutes Keywords: LAPAS ROKOK, ZnO, nanoparticles, photocatalyst
Isolasi dan Karakterisasi Amilase Termostabildari Geobacillus dYtae-14 Aminin, Agustin L.N.; Milarsih, Yulia; Mulyani, Nies Suci
Greensphere: Journal of Environmental Chemistry Vol 2, No 2 (2022): Volume 2 Issue 2 Tahun 2022
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gjec.2022.16321

Abstract

Enzim amilase termostabil merupakan salah satu enzim yang sangat potensial bagi industri, terutama industri makanan dan farmasi. Enzim termostabil memiliki beberapa keuntungan seperti reaksi berlangsung lebih cepat, menurunkan viskositas dan mencegah kontaminasi karena produksi berlangsung pada suhu tinggi. Penelitian ini mengeksplorasi potensi amilase termostabil dari isolat lokal  Geobacillus dYTae-14 yang tumbuh optimum pada suhu 55oC. Aktivitas spesifik amilase ditentukan berdasarkan produk glukosa yang diukur dengan metode DNS dan kadar protein ditentukan dengan metode Lowry. Tahapan penelitian ini meliputi pembuatan kurva pertumbuhan, isolasi enzim amilase termostabil, pemurnian parsial enzim, dialisis, penentuan aktifitas spesifik tiap fraksi, penentuan kandungan protein, penentuan temperatur dan pH optimum. Amilase termostabil dari Geobacillus dYTae-14 berhasil diisolasi dan menunjukkan aktivitas spesifik tertinggi pada fraksi kejenuhan ammonium sulfat 20-40%, sebesar 934,356 unit/mg protein. Temperatur optimum amilase termostabil dicapai pada 85oC dan pH optimum di pH 8; dengan aktivitas spesifik sebesar 2143,538 unit/mg protein.  
Co-Authors Aminin, Agustin L.N. Arif Sony Wibowo Nies Suci Mulyani Nor Basid Adiwibawa Prasetya Sri Wuning