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All Journal Indonesian Journal of Chemistry JMM (Jurnal Masyarakat Mandiri) Jurnal Redoks JAST : Jurnal Aplikasi Sains dan Teknologi Walisongo Journal of Chemistry AL-ULUM: JURNAL SAINS DAN TEKNOLOGI ALKIMIA : Jurnal Ilmu Kimia dan Terapan Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Stannum : Jurnal Sains dan Terapan Kimia Jurnal Cakrawala Ilmiah PARADIGM : JOURNAL OF MULTIDISCIPLINARY RESEARCH AND INNOVATION
Leni Legasari
Universitas Islam Negeri Raden Fatah Palembang
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Public Health Social Sciences Other

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PENGARUH SUHU DAN KELEMBAPAN TERHADAP NILAI SETTING TIME PADA SEMEN PCC (PORTLAND COMPOSITE CEMENT) DAN OPC (ORDINARY PORTLAND CEMENT) Azra Nazirah Nafiah; Legasari, Leni; Anaser, Novadri; Safaruddin, Safaruddin
PARADIGM : Journal Of Multidisciplinary Research and Innovation Vol 3 No 01 (2025): PARADIGM : Journal Of Multidisciplinary Research and Innovation
Publisher : Pusat Studi Ekonomi Publikasi Ilmiah dan Pengembangan SDM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62668/paradigm.v3i1.1403

Abstract

Temperature and humidity are important factors in the drying and hardening process of semen. The temperature in the hardening process ranges from 10°C to 35°C with a relative humidity of 40% to 60%. This research aims to analyze the effect of temperature and humidity on the initial and final setting time values ??of OPC and PCC cement in five different environmental conditions. The research results show that the higher the humidity level, the longer it takes for cement to harden, both for PCC and OPC. Conversely, the lower the humidity, the faster the setting time occurs. In increasing the initial setting time, PCC cement showed an increase of 38.5%, while OPC cement was 37.5%. For the final setting time, cement OPC experienced a more significant increase of 41.65%, compared to PCC which was only 25%. This shows that OPC cement has a faster final setting time and is relatively less influenced by temperature and humidity than PCC. This study concluded that temperature and humidity significantly influence the setting time of cement, with different effects varying between OPC and PCC cements.
Analysis of Oil and Fat Content in Palm Oil Industry Wastewater Gravimetric Analysis Amelia, Dian; Wijayanti, Fitria; Legasari, Leni
ALKIMIA Vol 7 No 1 (2023): ALKIMIA
Publisher : SCIENCE AND TECHNOLOGY FACULTY OF UNIVERSITAS ISLAM NEGERI RADEN FATAH PALEMBANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/tp0kr296

Abstract

Wastewater is unused waste water and contains many substances that can pollute the environment and disturb the health of living things. One of the parameters of wastewater pollution that is found in everyday life is oil and fat. Oil and fat are one of the parameters in wastewater consisting of compounds that can pollute water bodies so that their concentration must be limited, because their impact can damage aquatic ecosystems, especially on water resources. Oil and fat are compounds that contain the main component, triglycerides. Triglycerides are molecules resulting from condensation between one glycerol and three fatty acids. Based on SNI 6989.10: 2011 from the Regulation of the Minister of Environment No.05 of 2014, states that the maximum concentration of oil and fat quality standards contained in wastewater from the palm oil industry is 25 mg/L. The results of the analysis that has been carried out show that the levels of oil and fat in the palm oil industry wastewater samples include In-let wastewater (12,4 mg/L), Out-let (8,4 mg/L), Up-stream (3,6 mg/L) and Down-stream   (6 mg/L) which have been tested and analyzed using the gravimetric method
Analysis of Flavonoid content and Toxicity Test of Semambu Rattan Leaf Ethanol Extract (Calamus scipionum lour)with Brine Shirmp Lethality Test (BSLT) method Legasari, Leni; Rahmadona, Shevira Putri; Yani, Dwi Fitri; Oktasari, Ade
Stannum : Jurnal Sains dan Terapan Kimia Vol 7 No 1 (2025): April 2025
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v7i1.5062

Abstract

Semambu rattan is rattan that grows wild in the forest areas of Indonesia, especially in southern Sumatra, Kalimantan, and Sulawesi. This study aims to determine the % yield, phytochemical tests, levels of flavonoids and cytotoxicity of the ethanol extract of rattan semambu leaves using the BSLT method with Artemia salina leach test larvae. The yield % yield contained 9.36%, the phytochemical test of the ethanol extract of the semambu rattan leaves contained secondary metabolites of flavonoids, alkaloids, tannins, saponins, and steroids. The test results for the levels of flavonoids at a concentration of 1000 ppm obtained a value of 53.307 μg/ml and the toxicity test of the ethanol extract of rattan semambu leaves obtained an LC₅₀ 130.390 ppm which was toxic
A Comparison of Anti-inflammatory Activity of Ethanol Extracts of Young and Old Areca Seeds (Areca catechu L.) in vitro Legasari, Leni; Wati, Ambar; Yani, Dwi Fitri
Stannum : Jurnal Sains dan Terapan Kimia Vol 5 No 2 (2023): Oktober 2023
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v5i2.4376

Abstract

Areca catechu L. has been widely used as a traditional medicine in medicinal practices in various countries around the world. Areca nut contains secondary metabolite compounds such as alkaloids, flavonoids, triterpenoids, steroids, and tannins so it has great potential to be developed as a medicine. The use of anti-inflammatory drugs from natural ingredients is widely developed because synthetic non-steroidal anti-inflammatory drugs cause side effects to the body such as nausea, diarrhea, headaches, and stomach ulcers. This study aims to determine the content of secondary metabolites and determine the anti-inflammatory activity of ethanol extracts of young and old areca nut seeds. Old areca nut seeds used are areca nut fruits that have an orange color while young areca nut seeds are areca nut fruits that have a green color. The anti-inflammatory activity test method was carried out using the protein denaturation inhibition method at 5, 10, 15, and 20 ppm extract concentrations. The results of this study indicate that young and old areca nut seeds positively contain alkaloids, flavonoids, tannins, and saponins and negatively contain steroids. The results of anti-inflammatory activity testing show that ethanol extracts of young and old areca nut seeds have the potential as anti-inflammatory because they have a percentage value of protein denaturation inhibition greater than 20%. A comparison of anti-inflammatory activity between areca nut seeds can be seen from the IC50 value of ethanol extract. The IC50 results show that young areca seeds have an IC50 value of 7.42 ppm which is higher than the old areca seeds of 11.52 ppm
Co-Authors Ade Oktasari Al Jabar, Jauharuddin Luthfi Ambar Wati Amelia, Dian amiliza miarti Amiliza Miarti anaser, Novadri Azra Nazirah Nafiah Darwati Darwati Dwi Fitri Yani Elfira Rosa Pane Elfita Elfita Fitria Wijayanti, Fitria Fitria, Nadyatul Komis Maghpiroh, Ana Mardini, Intan Mariyamah, Mariyamah Muharni Muharni Munawar Munawar Muryati Muryati Muyasaroh Nurwijayanti Rahmadona, Shevira Putri Rohmatullaili, Rohmatullaili Tantri Oktari Wati, Ambar Yani, Dwi Fitri Yuni Melwani