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INDONESIA
SAINS DAN MATEMATIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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Articles 5 Documents
 1 
Search results for , issue "Volume 22 Issue 3 Year 2014" : 5 Documents clear
Jelly Fermented Soy Whey as Antioxidants Source of Alternative Functional Food Lailiya A, Rizqi Nabilatul; Wahyuningsih, Dita; Hidayah, Wihda Wihdatul; Aminin, Agustina L. N.
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 3 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Soy tofu whey is residual water in the process of tofu manufacturing which is derived from the remaining soy milk clotting. Tofu whey contains bioactive compounds which have been studied previously could be potential as an antioxidant, antimicrobial, anti-mutagenic, and antihypertensive. This study aim was to produce pleasant JF-Soywhey and make society healthy. Manufacturing of JF-Soywhey was conducted through a whey tofu fermentation process using Kefir grains at room temperature (± 28°C) for 48 hours and subsequently processed into jelly. The results showed that the products varied with fruit juice got a favoured by the panellists. In addition, the antioxidant content of products was still quite high as the ripening effects lowered the antioxidant capacity of 13.9%. Hence it could be suggested that the kefir grain fermented tofu whey could be used as an antioxidant source alternative functional food such as JF-Soywhey.
Anthocyanin Identification of Methanol-HCl Extract Active Fraction in Rosella (Hibiscus Sabdariffa. L) and Its Potential as Xanthine Oxidase Inhibitor Pratiwi Puji Lestari; Dewi Kusrini; Khairul Anam
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 3 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

The active fraction of methanol-HCl extract of Roselle flower (Hibiscus sabdariffa. L) has been identified and its inhibitor xanthine oxidase potential tested. The aim of this study was to compare the inhibitory activity of xanthine oxidase from methanol-HCl extract and its fractionation results and to identify the chemical component of Roselle flower’s methanol-water active fraction which had xanthine oxidase inhibition activity. The chemical component identification of Roselle flower was preceded by extraction and fractionation. The types of chemical compound contents were identified by the spotting appearance, UV-Vis and IR spectroscopy. The quantification of chemical compound was carried out by TLC Scanner and xanthine oxidase inhibitory activity was tested in vitro. From this research, it was obtained the methanol-HCl extract yield of 4%. The Roselle methanol-HCl extract has the ability to inhibit activity of xanthine oxidase (IC50) was 0.64 ppm which was preponderant than the fractionation result. The 2nd fraction was the most active to inhibit the xanthine oxidase activity compared to the 1st and 3rd fraction. The main components of 2nd fraction were isolates A (Rf 0.9) and isolates D (Rf=0.64) which were expected as the group of anthocyanin. The relative level of isolate A and D were 4.67% and 24.24% respectively.
Comparative Study of Characteristicsof Sediment and Water Qualityin Aquaculture Farming Systems Area with Coastal Area Adjacent to Industrial Activities Putro, Sapto Purnomo; Febria, Ibni Jeudi; Muhammad, Fuad
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 3 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Disturbance of water environment due to organic enrichment caused by farming activities may result in the reduction of water quality and sediments. This study was conducted to determine the condition of the water and sediments in the area of aquaculture in ponds system compared to the adjacent coastal area of industrial activities. Water qualities observed were the temperature, DO, salinity, conductivity, turbidity and pH. Sediment characteristics measured were sediment grain size and organic matter content contained in the sediments. From the research, the temperature values obtained ranged 28.7-32.9°C, DO 3.63 to 6.4 mg/l, pH 4.31 to 6.27, salinity 4.6 to 33 ‰, conductivity 8.5- 50.2 ms/cm, turbidity 73-535 NTU. The substrate grain analysis showed at the fish farm area in pond systems was dominated by silt 71.70% and clay 16.71%. In the coastal area adjacent to the industrial activities, 93.38% substrate was dominated by sand. Analysis of organic matter content in the pond systems exhibited the highest ranged between 0.72% -1.16% for nitrogen and 3.20%-10.35% for carbon. The differences in the composition of the substrate and the organic material can be caused by hydrographic conditions, especially strong/weak water currents, the accumulation of litter originating from the decomposition of leaves of mangrove, enrichment of nutrients during the decomposition of litter and aquaculture activities and industries.
Evaluation of Cytotoxicity Effect of Hyptis pectinata Poit (Lamiaceae) extracts using BSLT and MTT methods Suzery, Meiny; Cahyono, Bambang
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 3 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Hyptis pectinata (Lamiaceae) is a traditional medicinal plants to treat conditions associated with malignant disease. In Indonesia, this plant has not been utilized yet, just as a wild plant. This study aimed to evaluate the anticancer activity of Hyptis pectinata poit extracts which are more beneficial. Methanol extract and various fractions solvents (hexane, dichloromethane, ethyl acetate) were examined their toxicities to shrimp larvae Artemia salina Leach using BSLT method and their anticancer activity in vitro on cells MCF-7 breast cancer using MTT assay method. The toxicity test on shrimp larvae Artemia salina Leach, methanol extracts have LC50: 185.63 µg/mL and fractions of hexane, dichloromethane and ethylacetate were obtained at 128.45; 113.32 and 92.54 µg/mL successively. Whereas the cytotoxicity test on breast cancer cells MCF-7 resulted that methanol extract Hyptis pectinata poit obtained at IC50: 18.90 μg/mL. Hyptis pectinata poit extract showed good cytotoxic and anticancer activity hence it has a chance to be developed to as anticancer drugs.
Solving a system of linear equations by QR Factorization Method for Temperature and Altitude Regression Model against Spontaneous-Potential Widowati, Widowati; Setyawan, Agus; Mustafid, Mustafid; Nur, Muhammad; Sudarno, Sudarno; Harmoko, Udi; Adhy, Satriyo; Gunawan, Gunawan; Subagio, Agus; Tjahjana, Heru; Sulpiani, Ririn; Riyanto, Djalal Er; Suhartono, Suhartono; Mukid, Mochammad Abdul; Suseno, Jatmiko Endro
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 3 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Many real problems can be represented in the form of multiple linear regression equation. One of those is the relationship between the variables of temperature and altitude of the spontaneous-potential. In order to determine the parameters of the regression equation, the least squares method was used. From here, there was obtained the system of linear equations. In this paper, to solve systems of linear equations, the exact method was used as the exact solution is certainly better than the approached solution. The method used was the QR factorization method. At the QR factorization, the system of linear equations was written in form of matrix equation. Then, the coefficient matrix which the number of rows is m and number of columns is n with linearly independent columns was factored into the matrix Q which has the same size with the matrix A, with orthonormal columns and matrix R was upper triangular. Furthermore, by backward substitution, it could be obtained the exact solution of linear equation system. As verification of this proposed method, a case study was given using data of temperature, altitude, and spontaneous-potential in the geothermal manifestations area, Gedongsongo, Mount Ungaran Semarang. From here, it was obtained the parameters of exact multiple linear regression model which states the relationship between temperature and altitude toward the spontaneous-potential.

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