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All Journal BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) KLOROFIL: Jurnal Ilmu Biologi dan Terapan ALKIMIA : Jurnal Ilmu Kimia dan Terapan KLOROFIL: Jurnal Ilmu Biologi dan Terapan
Leni Widiarti
Universitas Islam Negeri Sumatera Utara
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Immunology & microbiology Social Sciences

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Analisa Kandungan Mineral, Lemak dan Protein pada Sampel Ikan Kembung Rebus Asin Leni Widiarti; Sajaratud Dur
KLOROFIL: Jurnal Ilmu Biologi dan Terapan Vol 6, No 1 (2022): KLOROFIL : JURNAL ILMU BIOLOGI DAN TERAPAN
Publisher : Program Studi Biologi Fakultas Sains dan Teknologi Universitas Islam Negeri Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30821/kfl:jibt.v6i1.12407

Abstract

Research has been carried out to analyze the content of minerals, fat and protein in salted boiled pufferfish samples. Samples were purchased from a traditional market in Medan City, Indonesia. The method used is the 2005 AOAC method. Crude protein analysis was carried out by the Kjeldhal method, crude fat analysis was carried out by the Soxhlet extraction method, water content analysis was carried out by the drying method, ash content analysis was carried out by the combustion method at high temperature, and mineral analysis was carried out by using an Atomic Absorption Spectrophotometer (AAS). The results of the analysis of the salted mackerel sample obtained crude protein content of 65.9770 %, this indicates that the salted boiled mackerel sample has a high protein content. Crude fat content from the analysis is 16.7600 %. The water content and ash content of the boiled mackerel samples were 9.5077% and 6.2700%, respectively. Mineral analysis, namely the levels of calcium and sodium obtained respectively 0.7635 ppm and 0.7571 ppm.
Analisa Kandungan Mineral, Lemak dan Protein pada Sampel Ikan Kembung Rebus Asin Leni Widiarti; Sajaratud Dur
KLOROFIL: Jurnal Ilmu Biologi dan Terapan Vol 6, No 1 (2022): KLOROFIL: JURNAL ILMU BIOLOGI DAN TERAPAN
Publisher : Program Studi Biologi Fakultas Sains dan Teknologi Universitas Islam Negeri Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30821/kfl:jibt.v6i1.12407

Abstract

Research has been carried out to analyze the content of minerals, fat and protein in salted boiled pufferfish samples. Samples were purchased from a traditional market in Medan City, Indonesia. The method used is the 2005 AOAC method. Crude protein analysis was carried out by the Kjeldhal method, crude fat analysis was carried out by the Soxhlet extraction method, water content analysis was carried out by the drying method, ash content analysis was carried out by the combustion method at high temperature, and mineral analysis was carried out by using an Atomic Absorption Spectrophotometer (AAS). The results of the analysis of the salted mackerel sample obtained crude protein content of 65.9770 %, this indicates that the salted boiled mackerel sample has a high protein content. Crude fat content from the analysis is 16.7600 %. The water content and ash content of the boiled mackerel samples were 9.5077% and 6.2700%, respectively. Mineral analysis, namely the levels of calcium and sodium obtained respectively 0.7635 ppm and 0.7571 ppm.
SOIL QUALITY IN ORGANIC AGRICULTURAL LAND: STUDY OF CHEMICAL ANALYSIS AND SOIL MICROBIOLOGY Melfa Aisyah Hutasuhut; Husnarika Febriani; Leni Widiarti
BIOLINK (Jurnal Biologi Lingkungan Industri Kesehatan) Vol. 9 No. 2 (2023): February
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/biolink.v9i2.8178

Abstract

Increased public awareness for a healthy diet must be balanced with successful cultivation. Organic farming system is the right choice since it leaves all non-organic components. This study aims to identify the chemical and microbiological properties of agricultural soils that apply organic systems located in Batang Buluh Village, Pematang Johar, Deli Serdang Regency, North Sumatra. Chemical analysis was carried out at Socfindo Laboratory in Medan, including testing the pH of H2O, total P and K, C Organic, N Kjehldahl, and CEC (Cation Exchange Capacity). Soil microbiological tests were carried out at Medan Regional Health Lab including gram staining tests and biochemical tests. The results of chemical analysis from the analysis of pH H2O, P and total K, Organic C, N Kjehldahl, and CEC (Cation Exchange Capacity) at the edges and middle each obtained that was pH 5 -6, soil total P content was 0.0260% up to 0.450%, available K analysis, namely 0.200% and 0.210%, organic C content obtained results of 0.970% and 0.630%, N content using the KJehldahl method was 0.150% and 0.090%, and CEC obtained results of 14.330 me/100 and 10.090 me/100 g. Related species of Bacillus contained in the soil were Gram-positive, rod-shaped, spore-forming, aerobic or facultative anaerobic, motile bacteria with peritrichous flagella.
Molecular Weight and Functional Group Analysis of Low Molecular Weight of Liquid Cyclic Natural Rubber Widiarti, Leni; Sajaratuddur, Sajaratuddur; Wirjosentono, Basuki; Eddyanto, Eddyanto
ALKIMIA Vol 6 No 1 (2022): ALKIMIA
Publisher : SCIENCE AND TECHNOLOGY FACULTY OF UNIVERSITAS ISLAM NEGERI RADEN FATAH PALEMBANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (627.564 KB) | DOI: 10.19109/alkimia.v6i1.11711

Abstract

The research about molecular weight and functional group analysis of low molecular weight liquid cyclic natural rubber has been done. The aim of this research is to achievement the quality of low molecular weight of liquid cyclic natural rubber. This research has been made in several steps such as preparation of the sample of rubber, the process of molecular degradation of cyclic rubber, and characterization of LCNR by using FTIR, GPC and viscosity test. Degradation is done with the help of the phenylhydrazine reagent with oxygen gas atmosphere with a flow rate of 2 LMin-1 for 24 hours. Molecular weight analysis by GPC had result the LCNR sample had a Mw is 60,556, a Mn is 6,661, and a PDI is 11,08613. The intrinsic viscosity can be used by relating it to the molecular weight by the Mark Houwink – Sakurada (MHS) equation and get the result 63.533 for LCNR molecular weight. The C-H stretching and bending region are two of the most difficult regions to interpret in infrared spectra. The ranges between 3300 to 2750 cm-1 is the C-H stretching region, is the more practical of the two regions. The frequency with which C-H bonds are obstructed is largely determined by the type of hybridization attributed to the bond. The stronger the vibrational force constant, the higher the vibration frequency.
Co-Authors Basuki Wirjosentono Eddyanto Eddyanto, Eddyanto Husnarika Febriani Melfa Aisyah Hutasuhut Sajaratud Dur Sajaratuddur, Sajaratuddur