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Siang Tandi Gonggo
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Chemistry Education

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Journal : Jurnal Akademika Kimia

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Pemanfaatan Ekstrak Daun Mahkota Dewa (Phaleria macrocarpa (Scheff.) Boerl) sebagai Pengawet Tomat Supriatni, Dina; Said, Irwan; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 5, No 2 (2016)
Publisher : Universitas Tadulako

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Abstract

Tomato fruit is one of the fruits susceptible to decay because of its high water content. The durability of tomato can be improved by storing in a humid place or by adding of a preservative. Phaleriamacrocarpa (Scheff.) boerlleaf can act as an antibacterial due to the saponin compounds contained therein. This study aimed to investigate the phaleriamacrocarpa (Scheff.) boerlleaf extract as a preservative for tomatoes, and to determine the concentration of leaf extract to sustain tomatoes texture longer. The method used in this study was the maceration for extraction, and iodometric titration to determine of vitamin C levels before and after curing. The results showed that the pickling tomatoes using phaleriamacrocarpa (Scheff.) boerl leaf extract with a concentration of 6% sustained tomatoes up to 9 days, and the fruit decreased levels of vitamin C from 33.440 mg/100 g material into 27.580 mg/100 g of material.
Penentuan Waktu Optimum Dalam Pembuatan Bioetanol Dari Bonggol Pisang Tanduk(Musa paradisiaca formatypisa) Melalui Fermentasi Setiawati, Eka Lilis; Gonggo, Siang Tandi; Abram, Paulus Hengky
Jurnal Akademika Kimia Vol 5, No 3 (2016)
Publisher : Universitas Tadulako

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Abstract

Banana tuber contains 76% starch as a source of organic material that can be changed to bioethanol which is an alternative of fuel oil. This study aimed to determine the optimum time of fermentation in the process of producing bioethanol from banana (musa paradisiaca formatypisa) tuber. In this study the fermentation of banana tuber is determined using saccharomyces cereviseae with the variation time of 3, 4, 5, 6, 7, 8 and 10 days. The stages carried out in this study were preliminary or sample preparation, delignification, hydrolysis, fermentation and separation. Bioethanol from the fermented ricestraw was analyzed using alcoholmeter. The content of bioethanol product increased on days 3 to 7 and reach the optimum on the day 7 which was 8.90%, where on the day 8 and 10 decreased the ethanol content.
Uji Efektivitas Ekstrak Daun Sambiloto (A. Paniculata [burm.F] ness) Sebagai Bahan Pengawet Alami Tomat Dan Cabai Merah Pusung, Widya Astuti; Abram, Paulus Hengky; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 5, No 3 (2016)
Publisher : Universitas Tadulako

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Abstract

Preservation synthetically or naturally is intended to extend the storability of tomato and red chili. Sambiloto (A. paniculata [Burm.f] Nees) is containing saponins that has anti-bacterial properties, therefore can be used as a preservative. The aim of this study was to investigate whether the extract of sambiloto leaf can be used as a natural preservative for tomato and red chili, and to determine the concentration of extract of sambiloto leaf which was effectively used as the preservative. The method used in this study was maceration to produce extract and iodometric titration to determine the levels of vitamin C before and after preservation. The results showed that the pickling tomatoes and red chili using extract of sambiloto leaf with a concentration of 6% sustained tomates up to 9 days and red chilies up to 11 days. Level of vitamin C contained in tomato was decreasing from 39.9 mg/100g to 37.54 mg/100g of material while red chilli is decreasing from 79.78 mg/100g to 72.74 mg/100g of material.
Pemanfaatan Buah Mengkudu (Morinda citrifolia L.) Sebagai Adsorben Untuk Meningkatkan Mutu Minyak Jelantah Juliana, I Nengah; Gonggo, Siang Tandi; Said, Irwan
Jurnal Akademika Kimia Vol 4, No 4 (2015)
Publisher : Universitas Tadulako

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Abstract

The aim of this study is to lower the value quality parameters of used cooking oil to reach the national industry standards using adsorbent of noni (morinda citrifolia L.) fruit as well as to determine the optimum concentration (% w/w) of noni in increasing quality of used cooking oil. The parameters in this study are the water content, free fatty acids, colour and density. The method used to determine the water content and free fatty acid levels were the gravimetric method and acid-base titration, while determination of the colour and density used UV-Vis spectrophotometer and pycnometer. The concentration of noni adsorbent in the oil refining process varied ie 12%, 15%, 18%, 21%, and 24%. The results showed that the water content, free fatty acids, and the density decrease with an increase in adsorbent. The oil colourwas brighter with increasing noni fruit adsorbent used. The study showed that the noni fruit adsorbent can lower the value quality parameters of used cooking oil, and only the density from the four parameters did not meet ISO standard. The concentration weight per weight (% w/w) optimum noni fruit was 24%.
Pengaruh Kaolin Terhadap Membran Blend Kitosan Poli Vinil Alkohol-Litium Sebagai Membran Elektrolit Untuk Aplikasi Baterai Ion Litium Gonggo, Siang Tandi; Diah, Anang Wahid M.; Lanteene, Reki
Jurnal Akademika Kimia Vol 6, No 1 (2017)
Publisher : Universitas Tadulako

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Abstract

Today, the battery is the most practical and in expensive energy storage device in a modern community. A variety of new materials technologies has been developed in the manufacture of the battery, especially the development of the solid electrolyte (solid). Polymer Electrolytes can be found in the polymer batteries form such as lithium ion polymer battery. A natural polymer such as chitosan is potential as polymer electrolyte membrane for battery applications. The chitosan has amino and hydroxyl groups that allow for modification. The modification of chitosan membrane is expected to produce the better membranes characters. The aim of this research is to study the effect of the addition of inorganic filler kaolin on the conductivity of the polymer electrolyte that made of chitosan-polyvinyl alcohol than was added to the lithium salt. The ionic conductivity of the polymer electrolyte chitosan-polyvinyl alcohol-lithium-kaolin was measured by using an impedance spectroscopy. The measurement results showed that the polymer electrolyte chitosan-polyvinyl alcohol-lithium with the addition of 4% kaolin provide the highest ionic conductivity is large 6.551x10-5 S/cm. In comparison, characteristics of batteries that made from polymer electrolyte chitosan-polyvinyl alcohol-lithium with the addition of kaolin have a voltage of 2.4 volts which have similarities to the commercial batteries. This result indicates that the kaolin can be used as a filler to increase the ionic conductivity of the polymer electrolyte chitosan-polyvinyl alcohol-lithium, and then it can be developed as a battery.
PERBANDINGAN PENERAPAN METODE PEMBELAJARAN ROLE PLAYING DENGAN PEMBELAJARAN KONVENSIONAL TERHADAP HASIL BELAJAR KIMIA SISWA SMA NEGERI 1 LORE UTARA Masrita, Masrita; Gonggo, Siang Tandi; Sabang, Sri Mulyani
Jurnal Akademika Kimia Vol 2, No 1 (2013)
Publisher : Universitas Tadulako

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Abstract

Research dealing with role-play Learning and conventional learning methods, have been conducted. The main reason for this research was that chemical bond was one of the difficult but fundamental materials to be mastered by the students at grade X. The purpose of this research was to investigate the students’ achievement on the topic of chemical bond at SMA Negeri 1 North Lore. One way of increasing their achievement was by using role-play method. In order to make their learning understandable, not boring, and easy to grasp, the researcher applied an interesting method called role-play. The population of this research was the tenth grade students of SMA Negeri 1 North Lore in the academic year 2012/2013. The sample was 32 students of grade XA as the experimental group (role-play) and 32 students of grade XC as the control group (conventional learning). The data were collected through the test on chemical bond. Based on the analysis, it is found that the average score of the experimental group was 20.65 with deviation standard of 2.413 and of the control group was 15.06 with deviation standard of 2.975. The hypothesis testing was that the t-counted value was 12.75 and the t-table value was 1.67 with the significant value (α) of 0.05. The results showed that there was a significant difference in the students’ achievement dealing with the topic of chemical bond through the application of role-play learning method and conventional learning method at grade X at SMA Negeri 1 North Lore in the Academic Year 2012/2013.
PROFIL KINETIKA PERUBAHAN KADAR GLUKOSA PADA NASI DALAM PEMANAS Islamiyah, Ukuwah; Gonggo, Siang Tandi; Pursitasari, Indarini Dwi
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

Rice cooker is used to keep rice warm and soft. During the warming process there is a change in glucose level in rice. The kinetic profile of glucose level change of rice in rice cooker is important to be done to determine an ideal time needed so that rice is suitable for consumption. The objective of this study is to determine constant reaction rate, reaction order, reaction speed, and half time of glucose level changes of rice in rice cooker. Method of this study is phenol-sulfuric acid, where modest sugar react with phenol in concentrated sulfuric acid produce a stabil orange colour, by using uv-vis that is bsorbed in 490 nm wavelength. The research’s result shows that there is a decreasing on glucose level in rice of mbramo type that is 32.2 ppm to 5.8 ppm for 40 hours kept in rice cooker. The changesof glucose level of rice in rice cooker following equation of one order reaction, with value of constant reaction speed achieved is 3.8 x 10-2/hour, half time 18.2 hours and reaction speed 0.5 ppm/hour.
Analisis Kadar Flavonoid dan Fenolat pada Kulit Buah Manggis (Garcininia mangostanaL.) Rezki, Atika Putri; Gonggo, Siang Tandi; Sabang, Sri Mulyani
Jurnal Akademika Kimia Vol 6, No 4 (2017)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine flavonoid and phenolic levels from the mangosteen bark samples. The preparation process of the sample was performed by extraction through maceration technique using HCl 1% in ethanol and for the phenolic using ethanol. Levels of both analit were determined using a UV-Vis spectrophotometer at the wavelength of 510 nm and 700 nm for the flavonoid, and 765 nm for the phenol. The results showed that flavonoids and phenol levels in the mangosteen bark samples were 1.271 mg/g and 12.373 mg/g.
Pengaruh Alumina Terhadap Membran Blend Kitosan-Polivinil Alkohol- LitiumSebagai Membran Elektrolit Baterai Mesakh, Eka Putra; Napitupulu, Mery; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 6, No 2 (2017)
Publisher : Universitas Tadulako

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Abstract

The research aim was to study the effect of adding % weight alumina on the conductivity of polymer electrolyte chitosan-PVA-lithium. The characterization of functional groups was determined using fourier transform infrared spectrometry (FTIR). The Ionic conductivity of polymer electrolyte chitosan-PVA-lithium-alumina was measured by using impedance spectroscopy. The measurement results show the polymer electrolyte with the addition of 5% alumina provides the highest ionic conductivity of 3.991 x 10-3S/cm. Battery characteristics of electrolyte polymer of chitosan-PVA-lithium with the addition of alumina have a voltage of 1.4 Volts compared to commercial batteries which have a voltage of 1.5 Volts. These results indicate that alumina can be used as a filler to increase the ionic conductivity.
PENGGUNAAN QR CODE DALAM PEMBELAJARAN POKOK BAHASAN SISTEM PERIODIK UNSUR PADA KELAS X SMA LABSCHOOL UNTAD Mustakim, Sartika; Walanda, Daud K.; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 2, No 4 (2013)
Publisher : Universitas Tadulako

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Abstract

Utilization of information technology in particular a QR code in education is still lacking. Therefore the reseacher is examining the QR code in the chemistry learning. Teaching and learning activities in the classroom are still dominated by teachers, meanwhile students seem expect more aids from their peers in performing the task. which due to a number of student are still lack of confidence in completing their tasks. In this study, the researchers use the QR code in the learning of periodic table topics regarding properties of elements. The problem statement was wether the learning outcomes of student who involved in the learning using QR code are better than student who take lessons without involving the use of QR code. The number of student in class X science Labschool Untad for 2013/2014 academic year are 22 student in experimental classroom and 22 student in control classroom which are determined by purposive sampling. Based on the results, it is concluded that the learning outcomes of students who took lessons with the use of QR code is higher than the learning outcome of students who took the lessons without involving the use of QR code for student in class X SMA Labschool Tadulako University.
Co-Authors Agustin Tiwow Anang Wahid M.Diah Andriani Andriani Daud Karel Walanda Febiliyanti, Rezha Indarini Dwi Pursitasari Islamiyah, Ukuwah Juliana, I Nengah Jumadil, Jumadil Lanteene, Reki Masriana Masriana, Masriana Masrita, Masrita Mery Napitupulu Mesakh, Eka Putra Milawati Milawati Moede, Fika Herlina Muhammad Agus Muljanto Mustakim, Sartika Najamudin Lagganing Nurdin Rahman Paulus Hengky Abram Pusung, Widya Astuti Raguwan, Raguwan Ratman Ratman Rezki, Atika Putri Salim, Agustiawan Amat Santi Santi Setiawati, Eka Lilis Sitti Rahmawati Solika, Nafikatus Sri Mulyani Sabang Supriatni, Dina