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All Journal EKSAKTA: Journal of Sciences and Data Analysis Jurnal Sains dan Teknologi IJCER (International Journal of Chemistry Education Research) Indonesian Journal of Chemical Analysis (IJCA) Borobudur
Reni Banowati Istiningrum, Reni Banowati
Universitas Islam Indonesia
Agriculture, Biological Sciences & Forestry Arts Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Environmental Science Materials Science & Nanotechnology

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PEMANFAATAN ABU SEKAM PADI UNTUK PEMURNIAN BAHAN BAKU DAN PRODUK BIODIESEL DARI MINYAK JELANTAH Istiningrum, Reni Banowati; E.A, Priyadi; Sulfiah, L.A.,; D, Nafisah
JST (Jurnal Sains dan Teknologi) Vol 6, No 1 (2017)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (824.413 KB) | DOI: 10.23887/jst-undiksha.v6i1.9440

Abstract

Abu sekam padi (ASP) merupakan limbah pada proses pembakaran batu bata yang berpotensi sebagai adsorben karena memiliki kandungan silika yang tinggi. Penelitian ini bertujuan untuk mengetahui potensi abu sekam padi sebagai adosorben pada proses pembuatan biodiesel dari minyak jelantah. Abu sekam padi diaplikasikan dalam pemurnian minyak jelantah dan juga produk biodiesel. Penelitian ini dilakukan dengan beberapa tahap yaitu karakterisasi ASP, pemurnian minyak jelantah, pembuatan biodiesel melalui transesterifikasi dengan katalis NaOH, pemurnian biodiesel dengan ASP 1, 3, 5% serta karakterisasi biodiesel. Abu sekam padi memiliki luas area spesifik dengan metode metilen biru sebesar 119,59 m2/g. Abu sekam padi dapat menurunkan kadar asam lemak bebas dalam minyak jelantah sebesar 62,4%. Proses transesterifikasi minyak jelantah menghasilkan biodiesel sebesar 96%. Masa ASP optimum untuk memurnikan biodiesel adalah 3% dengan nilai bilangan asam, gliserol total dan bilangan ester berturut-turut adalah 2,5 mg KOH/g, 0,37% dan 98,37%.
Analysis of Total Antioxidant Capacity on Ingredients of Lotek Menu by Ferric Reducing Antioxidant Power Assay Reni Banowati Istiningrum
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 13, ISSUE 1-2, August 2013
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol13.iss1-2.art5

Abstract

Total Antioxidant Capacity (TAC) determination has been made in the vegetable component of lotek with Ferric Reducing Antioxidant Power (FRAP) methods. Samples was crushed and then extracted with water as a polar solvent and centrifuged. The residue was extracted again with acetone as a non-polar solvent. The extract is then reacted with FRAP reagent and the absorbance measured by UV-Vis spectrophotometer at 595 nm. TAC values expressed as mM/mL extract of vegetables component of lotek for the water extract of green beans, peanuts, bean sprouts, cabbage, cucumbers, tomatoes, and spinach respectively is 2,72; 6,79; 1,26; 0,89; 0,33; 1,86; 1,85 mM /mL extract, while the acetone extract is 1,42; 5,41; 0,44; 0,32; 0,25; 1,09; 0,93 mM/mL extract. The three largest contribution to the total TAC is a water extract of peanuts, acetone extract of peanut and water extract of green beans respectively is 25,56; 21,16 and 10,66%.Keywords: lotek, TAC, FRAP, spectrophotometer UV-Vis
Preparation of Chitin, Study of Physicochemical Properties and Biopesticide Activities Yuli Rohyami; Reni Banowati Istiningrum
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 13, ISSUE 1-2, August 2013
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol13.iss1-2.art6

Abstract

Chitin was preparated from shrimp shells by chemically method. Preparation was carried out by deproteination shrimp shells powder < 150 mesh with 1 - 2 M NaOH, demineralization followed by reaction with 1.0 M HCl and depigmentation with (1 : 2 : 4, v/v) of chloroform : methanol : water. Physicochemical properties of chitin was determined from characterization of infrared spectra, ash value, loss on drying and total of nitrogen. Biopesticide activities of chitin was done to pest Bemisia tabaci at guava leaves with various concentration from 0.5 to 2.0 % chitin on 3 % v/v acetic acid. This study indicated that concentration of NaOH on deproteination process effected to its physicochemicals properties. Effectivity of 2 M NaOH on deproteination reaction was higher than 1 M NaOH . The degree of chitin deacetylation from 2 M NaOH was 13.61% and had lower molar ratio of total nitrogen. The degree of deacetylation of chitin from 1 M NaOH had lower and had higher molar ratio of total nitrogen. Physicochemicals properties of chitin quite an impact on its ability to reduce pest Bemisia tabaci. Biopesticide activity assay showed that treatment for 2 days on average mortality rate of 13.83%. Deacetylation of chitin which has a higher degree have a greaterability biopesticide with a mortality rate of up to 38.24%. This study the effect of deproteination process to biopesticide activities of chitin.Key Words : chitin, degree of deacetilation, molar ratio, biopesticide, Bemisia tabaci
PEMANFAATAN ABU SEKAM PADI UNTUK PEMURNIAN BAHAN BAKU DAN PRODUK BIODIESEL DARI MINYAK JELANTAH Reni Banowati Istiningrum; Priyadi E.A; L.A., Sulfiah; Nafisah D
JST (Jurnal Sains dan Teknologi) Vol. 6 No. 1 (2017)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (824.413 KB) | DOI: 10.23887/jstundiksha.v6i1.9440

Abstract

Abu sekam padi (ASP) merupakan limbah pada proses pembakaran batu bata yang berpotensi sebagai adsorben karena memiliki kandungan silika yang tinggi. Penelitian ini bertujuan untuk mengetahui potensi abu sekam padi sebagai adosorben pada proses pembuatan biodiesel dari minyak jelantah. Abu sekam padi diaplikasikan dalam pemurnian minyak jelantah dan juga produk biodiesel. Penelitian ini dilakukan dengan beberapa tahap yaitu karakterisasi ASP, pemurnian minyak jelantah, pembuatan biodiesel melalui transesterifikasi dengan katalis NaOH, pemurnian biodiesel dengan ASP 1, 3, 5% serta karakterisasi biodiesel. Abu sekam padi memiliki luas area spesifik dengan metode metilen biru sebesar 119,59 m2/g. Abu sekam padi dapat menurunkan kadar asam lemak bebas dalam minyak jelantah sebesar 62,4%. Proses transesterifikasi minyak jelantah menghasilkan biodiesel sebesar 96%. Masa ASP optimum untuk memurnikan biodiesel adalah 3% dengan nilai bilangan asam, gliserol total dan bilangan ester berturut-turut adalah 2,5 mg KOH/g, 0,37% dan 98,37%.
Perbandingan Metode Kalibrasi dan Adisi Standar untuk Penentuan Timbal Terlarut dalam Air Bak Kontrol Candi Borobudur Secara Spektrofotometri Serapan Atom (SSA)-Nyala Ida Sulistyaningrum; Melati Putri Git Utami; Reni Banowati Istiningrum
Borobudur Vol. 8 No. 2 (2014): Jurnal Konservasi Cagar Budaya Borobudur
Publisher : Balai Konservasi Borobudur Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33374/jurnalkonservasicagarbudaya.v8i2.133

Abstract

Telah dilakukan perbandingan metode kalibrasi dan adisi standar untuk penentuan timbal terlarut dalam sampel air bak kontrol Candi Borobudur. Studi dilakukan untuk mengembangkan metode adisi standar dalam penentuan kadar timbal terlarut yang sangat rendah menggunakan Spektrofotometri Serapan Atom (SSA)-Nyala. Pengambilan sampel dilakukan di lima titik, yaitu satu titik sisi selatan, satu titik sisi barat daya, dan tiga titik sisi utara Candi Borobudur. Metode adisi standar memiliki sensitivitas metode yang lebih baik daripada kalibrasi standar. Linearitas (R) kurva kalibrasi yang diperoleh sebesar 0,957, sementara terlarut yang berbeda dengan hasil metode kalibrasi lebih besar daripada hasil metode adisi standar.
Improvement of Learning Outcomes Inorganic Chemistry Through Cooperative Learning Approach Types Student TeamsAchievement Divisions with The Help Of Molymod Props Reni Banowati Istiningrum; Bayu Wiyantoko
IJCER (International Journal of Chemistry Education Research) VOLUME 1 ISSUE 1, AUGUST 2017
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcer.vol1.iss1.art3

Abstract

ABSTRACT: This study aims to study the application of STAD type cooperative learning in the course of Inorganic Chemistry combined with the use of Molymod props. The purpose of this study is to determine whether there is the influence of the application of STAD strategy and props Molymod to students' understanding on the subject of Inorganic Chemistry. Implementation of learning is done in two cycles, each cycle includes group learning outside the classroom, material confirmation by the lecturer, working on using the worksheet, and quiz. The data obtained were processed to see the development of each group from the value of the worksheet 1 to the worksheet 9. The group's developmental value was also measured using quizzes performed twice individually. Student attitudes toward STAD and Molymod use were measured using a behavioral scale questionnaire. Based on the assessment of group development, almost all groups showed an increase in group progress from worksheet 1 to worksheet 9. However, the group development value between worksheets and quizzes dropped dramatically. There is no influence of student attitude toward STAD strategy with material understanding. However, the use of molymod influences strong enough to the understanding of student materials. As many as 50% of students get a minimum score of B.Keywords: STAD, cooperative learning, learning outcomes, inorganic chemistry, molymod propsReceived: 15 June 2017, Revised: 5 August 2017, Accepted: 1 September 2017
Use of Interactive Media In Biochemical Material Puji Kurniawati; Reni Banowati Istiningrum
IJCER (International Journal of Chemistry Education Research) VOLUME 1 ISSUE 1, AUGUST 2017
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcer.vol1.iss1.art6

Abstract

ABSTRACT: A study of the use of interactive media in Biochemistry materials at Chemical Analysis Department, Islamic University of Indonesia has been done. Interactive media used in this research is animation media based on molymod and Flash. Molymod is used in lecturing activities to explain the macromolecular bonds and structures that are the focus of the Biochemistry course while the Flash-based animation is expected to improve students' understanding of biochemical metabolism processes in the body. The purpose of this study is to increase students' interest in biochemical learning which is known to be difficult and unattractive.Stages of this research there are 6, namely the initial stage, pre-design, design, model evaluation, field application and evaluation of results. The initial stage is done by improving the Course Outline (CO) and Teaching Unit Course (SAP) as well as the creation of lecture modules. Contents, materials and display modules have been reviewed by incorporating elements of analysis of biochemical examples that are often performed in the industrial world. Molymods of small capacity per set can only make two interconnected monomers. Flash-based animation media can be used during college or can be opened by students independently. The use of interactive media can stimulate students' high interest and understanding, ie 74.38% and 72.88% respectively. The correlation relationship between understanding and interest is also high which is marked with correlation coefficient value 0.806. The achievement of value ≥ B / C obtained with interactive media equal to 76,57% and Lecturer Performance Value (NKD) equal to 3,56.Keywords: interactive media, molymod, biochemistryReceived: 22 June 2017, Revised: 13 August 2017, 1 September 2017
Analisis Komposisi Biodiesel Hasil Konversi Minyak Biji Carica (Carica pubescens) Menggunakan Enzim Lipase Bekatul Reni Banowati Istiningrum; Hastin Nurrokhmah; Astri Sri Wahyuni
Indonesian Journal of Chemical Analysis (IJCA) Vol. 1 No. 01 (2018): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol1.iss1.art1

Abstract

Peningkatan konsumsi bahan bakar berbasis fosil mendorong berbagai penelitian untuk memproduksi bahan bakar yang bersifat terbarukan salah satunya biodiesel. Biodiesel adalah bahan bakar yang bersumber dari minyak nabati serta ramah lingkungan. Minyak biji carica berpotensi sebagai sumber minyak nabati untuk produksi biodiesel karena merupakan limbah home industry pengolahan buah carica dari Kabupaten Wonosobo dan merupakan nonedible oil. Penelitian ini bertujuan untuk memproduksi biodesel dari minyak biji carica secara enzimatis menggunakan enzim lipase yang diekstrak dari bekatul. Hasil penelitian ini menunjukkan sebesar 50,36 % minyak dapat diekstrak dari biji carica kering dengan komposisi terbesarnya adalah asam oleat. Enzim lipase dapat diekstrak dari bekatul menggunakan buffer pH 5,5 dengan nilai aktivitas sebesar 14,72 U/mL. Ekstrak enzim lipase ini juga menunjukkan sifat stabil selama penyimpanan 15 hari. Minyak biji carica berhasil dikonversi menjadi biodiesel dengan rasio molar minyak : metanol optimum adalah 1 : 6 dan rendemen yang dihasilkan sebesar 65,86% dengan kadar metil ester sebesar 98,7% relatif.
Co-Authors Astri Sri Wahyuni Bayu Wiyantoko D, Nafisah E.A, Priyadi Hastin Nurrokhmah Ida Sulistyaningrum L.A., Sulfiah Melati Putri Git Utami Nafisah D Priyadi E.A Sulfiah, L.A., Tri Esti Purbaningtias Yuli Rohyami