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INDONESIA
Matematika dan Sains
Published by Universitas Negeri Surabaya
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Core Subject : Education,
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Articles 67 Documents
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AKTIVITAS ANTIMIKROBIA BAKTERI ASAM LAKTAT Guntur Trimulyono,
Matematika dan Sains Vol 18, No 2 (2011)
Publisher : Matematika dan Sains

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Abstract

The proposes of research were to isolate lactic acid bacteria from vegetable sample and to know their ability to produce antimicrobial compounds. Vegetable samples used were potato, cabbage, sweet potato, and carrot. From those samples it had been isolated 40 isolate predicted as lactic acid bacteria, followed corfirmation test using Gram coloring, catalase test, endospore coloring, and motility. Lactic acid bacteria isolate were screened their ability in inhibiting bacteria tets namely Pediococcus acidilactici LB 42, Staphylococcus aureus ATCC 25923, and Escherichia coli ATCC 35218. The results of reseach showed that four isolates could inhibite growing of Pediococcus acidilactici LB 42, Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 35218. The antimicrobial subtance produced by BAL isolate was predicted organic acid.
AKTIVITAS ANTIMIKROBIA BAKTERI ASAM LAKTAT Guntur Trimulyono,
Matematika dan Sains Vol 18, No 2 (2011)
Publisher : Matematika dan Sains

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Abstract

The proposes of research were to isolate lactic acid bacteria from vegetable sample and to know their ability to produce antimicrobial compounds. Vegetable samples used were potato, cabbage, sweet potato, and carrot. From those samples it had been isolated 40 isolate predicted as lactic acid bacteria, followed corfirmation test using Gram coloring, catalase test, endospore coloring, and motility. Lactic acid bacteria isolate were screened their ability in inhibiting bacteria tets namely Pediococcus acidilactici LB 42, Staphylococcus aureus ATCC 25923, and Escherichia coli ATCC 35218. The results of reseach showed that four isolates could inhibite growing of Pediococcus acidilactici LB 42, Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 35218. The antimicrobial subtance produced by BAL isolate was predicted organic acid.
OPTIMASI DOSIS ALOKSAN UNTUK INDUKSI DIABETES MENGGUNAKAN HEWAN MODEL TIKUS PUTIH BETINA Nur Qomariyah 1, ; Mulyati Sarto2,
Matematika dan Sains Vol 18, No 2 (2011)
Publisher : Matematika dan Sains

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Abstract

Alloxan was one diabetogen often used to study diabetes either with single or repeated doses. Single dose used for induction of diabetic rats ranged 100-180 mg/kgbw, but the results are often not satisfied or not maximum, the success rate, mortality, and duration of diabetic conditions in experimental animals. The purpose of this study to determine the dose of alloxan for induction of diabetic which lasted more than 3 weeks. The research was done with complete randomized design using female white rats, Wistar strain, age 4 months, weight 170-200 grams for 20 days. Thirty-five rats were divided into seven groups, were 5 of each. All test animals induced with aloksan monohydrate in a dose respectively 100, 110, 120, 130, 140, 150, and 160 mg/kgbw intraperitonially. The results were analyzed ANAVA and LSD (p <0.05). The results for 20 days showed dose alloxan of 100 and 110 mg / kgbw could not produce a diabetic condition, dose of 120 mg/ kgbw can induce diabetic but did not survive more than 7 days, the dose can induce diabetic 130mg/kgbw which last up to 20 days. Doses of 140, 150, and 160mg/kgBB can induce diabetic, but have high mortality rate of between 60-80%. Therefore, dose of alloxan 130 mg/kgbw most effective for the induction of diabetic and last up to 20 days and potentially more than 20 days.
SINTESIS DAN KARAKTERISASI KATALIS Co-Al-MCM-41 Choirul Anam, ; Ratna Ediati,
Matematika dan Sains Vol 18, No 2 (2011)
Publisher : Matematika dan Sains

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Abstract

MCM-41 is a material that can be used as support for the properties he owned, among other things a uniform pore size and specific surface area is large. In this study has successfully created a catalyst Co-Al-MCM-41 with a hydrothermal method in the form of white powder into the ash-gray with a specific surface area ratio of 20 = 969.01 m2 / g and the ratio 40 = 1078.95 m2 / g and can used as a catalyst in cyclization cytronelal. The results of characterization by XRD, FT-IR and N2 adsorption-desorption showed that the catalyst Co-Al-MCM-41 has the same structure mesopori material MCM-41 is marked by the emergence of characteristic peaks difractogram at 1.8-2.4 ° 2 approximately, 3.5 -4.12 °, 4.31-4.82 °, and 5.64-6.00 °, and the pore size distribution between 30.49-34.09 Å, has a hexagonal shape and uniform particle morphology with average size 1 m. Results desorption nitrogen absorption analysis showed the surface area decreased with the growing amount of Co loading. Catalytic activity of Al-MCM-41 and Co-Al-MCM-41 at cyclization cytronelal reaction influenced by the nature of the acidity of the catalyst, which catalyst has a number of the more Lewis acid and Bronsted acid side has less active and selective nature of the cyclization reaction cytronelal be isopulegol. The highest activity of 81.30% and the highest selectivity of 75.10% for isopulegol shown by the catalyst Co-Al-MCM-41(20) in the solvent toluene. 2 / g and the ratio 40 = 1078.95 m2 / g and can used as a catalyst in cyclization cytronelal. The results of characterization by XRD, FT-IR and N2 adsorption-desorption showed that the catalyst Co-Al-MCM-41 has the same structure mesopori material MCM-41 is marked by the emergence of characteristic peaks difractogram at 1.8-2.4 ° 2 approximately, 3.5 -4.12 °, 4.31-4.82 °, and 5.64-6.00 °, and the pore size distribution between 30.49-34.09 Å, has a hexagonal shape and uniform particle morphology with average size 1 m. Results desorption nitrogen absorption analysis showed the surface area decreased with the growing amount of Co loading. Catalytic activity of Al-MCM-41 and Co-Al-MCM-41 at cyclization cytronelal reaction influenced by the nature of the acidity of the catalyst, which catalyst has a number of the more Lewis acid and Bronsted acid side has less active and selective nature of the cyclization reaction cytronelal be isopulegol. The highest activity of 81.30% and the highest selectivity of 75.10% for isopulegol shown by the catalyst Co-Al-MCM-41(20) in the solvent toluene.
SIFAT ANTIKAPANG EKSTRAK ZAT WARNA BUNGA KNOP (Gomphrena globosa L) Miksusanti, ; Setiawaty Yusuf,
Matematika dan Sains Vol 18, No 2 (2011)
Publisher : Matematika dan Sains

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Abstract

The aims of research was to study the color subtance of knop flower as antifungi. It was extracted by maceration using ethanol solvent. Antifungi assay against Aspergillus flavus and Aspergillus niger was conducted using contact method. Results of research showed that adding of color substance of knop flower extract of 30% decreased cell mass of A. flavus of 47.22% and A. niger of 25%. The MIC value were 45% for A. Flavus and 48% for A. niger.
PEMBUATAN DAN UJI KEMAMPUAN MEMBRAN KOMPOSIT KITOSAN-PVA UNTUK PEMISAHAN ZAT WARNA RHODAMIN-B Elvina Rossa, ; Nita Kusumawati,
Matematika dan Sains Vol 18, No 2 (2011)
Publisher : Matematika dan Sains

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Abstract

The aims of research were to know physical characteristic and performance of the chitosan-PVA composite membrane in separating rhodamin-B color with various PVA concentrations and operational pressure. The physical characteristic of membrane tested were tensil strength, stroke, morphology, and porous size. Membrane performance measured were flux value and rejection. Results showed that membrane had high load and high stroke at high concentration of PVA. Load value and stroke value obtained were 0.680-5.646 kgf and 1-9.25%, respectively. Result of SEM analysis showed that membrane produced was microfiltration membrane with porous size of 0.1-1.6 µm. The best flux value was resulted by R-1 membrane at pressure of 5 kg/cm2 namely 27.575 L/m2.hour. While the highest rejection coeficient value was resulted by membrane R-5 at pressure of 1 kg/cm2 namely 91.136%. The rejection coeficient value increased with increasing of PVA concentration, while it decreased with increasing of operational pressure.2 namely 27.575 L/m2.hour. While the highest rejection coeficient value was resulted by membrane R-5 at pressure of 1 kg/cm2 namely 91.136%. The rejection coeficient value increased with increasing of PVA concentration, while it decreased with increasing of operational pressure.
KINETIKA REAKSI ESTERIFIKASI n-OKTIL p-METOKSI SINAMAT (OPMS) Suyatno, ; Titik Taufikurohmah, ; Nurul Hidajati,
Matematika dan Sains Vol 18, No 2 (2011)
Publisher : Matematika dan Sains

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Abstract

The aim of research was to study the chemical kinetic of esterification of ester derivided from cinnamic acid, namely octyl-p-methoxy cinnamate. It was synthesized from ethyl-p-methoxy cinnamate isolated from kencur tuber and n-octanol. Results showed that esterification of octyl-p-methoxy cinnamate proceeded through first order reaction and its activation energy was 1530 Joule/ mol.

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