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UJI AKTIVITAS ANTIMIKROBA SERTA ANTIOKSIDAN ASAP CAIR CANGKANG SAWIT (Elaeis gueneensis jack) Yefrida -; Refilda -; Indrawati -; Irma Yanti Siregar
Jurnal Riset Kimia Vol. 4 No. 2 (2011): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v4i2.135

Abstract

  ABSTRACT Liquid smoke is one of natural preservative. It can make from many sources such as coconut shell, wood, etc. In this study, it is made from the palm kernel shell (Elaeis gueneensis jack) by using pirolysis method. Its contains is determined by GC-MS, while antimicrobial activity by Kirby-Bauer method and antioxidant activity by DPPH method. From the test, it can be concluded that this liquid smoke contains carboxylic acids, fenol and its derivative compound as a major component and has a good enough antimicrobial and antioxydant activity. Keywords : liquid smoke, pirolysis, antimicrobial, antioxvdant.   
OPTIMATION STUDY OF CARRAGEENAN EXTRACTION FROM RED ALGAE (Eucheuma cottonii) Refilda -; Edison Munaf; Rahmiana Zein; Abdi Dharma; Indrawati -; Lee Wah Lim; Toyohide Takeuchi
Jurnal Riset Kimia Vol. 2 No. 2 (2009): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v2i2.151

Abstract

 ABSTRACT Carrageenan is a general name for polysacharides, it is made up of sodium, potassium, magnesium, and calcium sulphat esters of galactose and 3.6-anhydrogalactose units. Research about parameters influencing extraction process of carrageenan from red algae (Eucheuma cottonii) has been studied. The parameters were particle size of red algae, pH of NaOH solution, heating time and heating temperature. About 64.30% of carrageenan was extracted from red algae (Eucheuma cottonii) under optimum condition, 425 µm particle size of red algae, solution pH 8.5, heating time 18 h, and heating temperature 95°C. The FTIR spectra of extracted carrageenan showed the same spectra as the pure carrageenan. Keywords : carrageenan, red algae (Eucheuma cottonii), and extraction    
PENENTUAN KANDUNGAN LOGAM ESENSIAL (Fe, Zn DAN Cu) DALAM DAUN SIRIH MERAH (Piper crocatum) SEGAR, AIR REBUSAN DAN AIR SEDUHANNYA DENGAN METODE SPEKTROSKOPI SERAPAN ATOM(SSA) Indrawati -; Willsant Saputra; Refilda -
Jurnal Riset Kimia Vol. 7 No. 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.171

Abstract

Vol 7 No 2ABSTRACTDetermination of essential metals (Fe, Zn and Cu) in red betel leaf has been carried out by usingAtomic Absorption Spectrophotometer (AAS). Fresh and dry red betel leaf extracted in 75 mLby boiled and brewed distilled water for 5, 10, 15 and 20 minutes. In the fresh red betel leafmetal content (Fe, Zn and Cu) were 0,3257 %, 0,173 % and 0,0278 % and the highest metalcontent (Fe, Zn and Cu) found in dry red betel leaf which were boiled for 20 minutes with theconcentration 0,0539 %, 0,0305 % and 0,0128 %. Red betel leaf is a source of essential metalsneeded by the body.Keywords: Atomic Absorption Spectrophotometry (AAS), Red betel leaf (Piper crocatum),decoction water, steeping water, Fe, Zn and Cu
PENINGKATAN KOMPETENSI SISWA MENGGUNAKAN MEDIA MODEL BERBANTUAN LKS PADA PEMBELAJARAN BIOLOGI KELAS XI IPA3 SMA NEGERI I PASIR PENYU INDRAGIRI HULU PROVINSI RIAU Indrawati -
Menara Ilmu Vol 12, No 3 (2018): Jurnal Menara Ilmu Januari 2018 Jilid 3
Publisher : LPPM Universitas Muhammadiyah Sumatera Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33559/mi.v12i3.553

Abstract

This class action research was done to know the improvement of students competencyusing the media of students worksheet-Assisted model in learning biology for the 11Th gradestudents of science of SMAN 1 PASIR PENYU which was held on April to May 2015.Theaim of this research is to improve the students competency using the media of studentsworksheet-Assisted model on material “ The sense system” for the 11Th grade students ofscience of SMAN 1 PASIR PENYU.The methodology used in this research is descriptive andthe parameter used was students and teachers activities during the process of learning activityand also students’ cognition, affectivity and psychomotor.The result of this research shows thatthe use of the media of student worksheet-Assisted model can improve the students’competency in mastering the concept of the sense system. The mean score of the daily tests inthe 1st,,2nd and 3rd cycles are : 69.18 , 74.75 and 76.1. the percentage of completeness in the1st,2nd and 3rd cycles are : 65,62% , 71,87% and 87,50%. While the mean student worksheetscore in the 1st,2nd and 3rd cycle are 77.96 , 79.21 and 81.96. The percentage of affective scorein the 1st,2nd and 3rd cycles are : 18,75% , 75% and 81.25% and the percentage of psychomotorscore in the 1st,2nd and 3rd cycles are : 50% , 68.75% and 84.37%. while the percentage ofstudent activity in the 1st,2nd and 3rd cycles are : 59.16% , 70.83% and 85.83% from 32students.Keyword: Kompetensi Belajar Biologi, Media Model Berbantuan LKS.
Co-Authors Abdi Dharma Agus Abdul Gani Edison Munaf Hendrasti Kartika Putri I Ketut Mahardika Irma Yanti Siregar Lee Wah Lim Musyriatul Fikriyah Rahmiana Zein Refilda Refilda Subiki - Toyohide Takeuchi Wardah Fajar Hani Willsant Saputra Yefrida -