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NOOR HUBDRYAWATI
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jurnalkimiaunmul@gmail.com
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Jurnal Kimia Mulawarman
Published by Universitas Mulawarman
ISSN : 16935616     EISSN : 24769258     DOI : DOI: https://doi.org/10.30872/jkm
Core Subject : Science,
Chemistry
Journal of Kimia Mulawarman is a peer-reviewed, open access journal that publishes original research articles, review articles, as well as short communication in all areas of chemistry, including educational chemistry and applied chemistry.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 2 Documents
 1 
Search results for , issue "Vol 8 No 2 (2011)" : 2 Documents clear
UJI FITOKIMIA DAN AKTIVITAS ANTIBAKTERI EKSTRAK KASAR ETANOL, FRAKSI n-HEKSANA, ETIL ASETAT DAN METANOL DARI BUAH LABU AIR (Lagenari siceraria (Molina) Standl) Eva Marliana; Chairul salaeh
JURNAL KIMIA MULAWARMAN Vol 8 No 2 (2011)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Phytochemical test and Antibacterial Activity test in each fraction of the gourds fruit (Lagenari siceraria (Molina) Standl) that came from Teluk Dalam, Tenggarong Seberang have been done. The sample of leaves was extracted with ethanol and then concentrated by using rotary evaporator. The ethanol crude extract was fractioned with n-hexane, Ethyl Acetate and Methanol. Based on the phytochemical test on secondary metabolits of the gourds fruit (Lagenari siceraria (Molina) Standl), it showed that ethanol crude extract contained flavonoid, saponin, steroid, and phenol. n-hexane fraction contained a steroid, ethyl acetate fraction contained phenol. And methanol-water fraction contained saponin and phenol. Based on the Antibacterial Activity test using the paper disc diffusion method (diameter 6 mm), the results of this test showed that the most active fraction is n-Heksana with : of the Bacillus cereus bacteria at the concentration 1, 2, 4, 6, 8 and 10% (b/v) with inhibition diameter 9.57, 9.88, 10.17, 12.18, 13 and 14.3 mm respectively so minimum inhibitory concentration got 0-1%. The active response toward Salmonella typhi bacteria at the concentration 1, 2, 4, 6, 8 and 10% (b/v) with inhibition diameter 7.50, 7.60, 8.20, 8.38, 8.87, and 9.8 mm so minimum inhibitory concentration got 0-1%. The chloramphenicol antibiotics concentration 0.00386 M as a standard to inhibit the growth of Bacillus cereus and Salmonella typhi bacteria with the inhibition diameter 12.58 mm and 15.06 mm respectively.
UJI AKTIVITAS ENZIM DEHIDROGENASE LAKTAT (DHL) YANG TERENKAPSULASI DALAM SILIKA DARI ABU SEKAM PADI Noor Hindryawati
JURNAL KIMIA MULAWARMAN Vol 8 No 2 (2011)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

A research has been conducted in testing the enzymatic activity of the encapsulated Lactate dehydrogenase (LDH) in silica by sol-gel process using sodium silicate from rice hull ash. The encapsulation was carried out by mixing sodium silicate (Na2SiO3) sol solution and phosphate buffer pH 7 containing both LDH enzyme and coenzyme of nicotinamide adenine dinucleotide (NAD+). After 2-6 minute of shaking, the mixture was then transferred into a 96-microwell plate and stored overnight. The encapsulation activity of encapsulation product was quantified by measuring absorption of NADH, as coenzyme hydrogenation product, at 340 nm utilizing an ELISA (Enzyme Linked Immunosorbent Assay) reader. For comparison similar experiment was also carried out for free enzyme. The result of the research shows that the kkat for encapsulated LDH enzyme (ET) is smaller than free enzyme (EB), which means that the encapsulation enzyme will affect the velocity of product reaction. The velocity of the encapsulation enzyme (ET) reaction is lower than free enzyme (EB) as the consequence of weak interaction between the substrate and enzyme or influenced by k1.

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