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Sri Risnoyatiningsih
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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YELLOW SWEET POTATO STARCH HYDROLYSIS INTO GLUCOSE ENZYMATICALLY Risnoyatiningsih, Sri
Jurnal Teknik Kimia Vol 3, No 1 (2008): JURNAL TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v3i1.103

Abstract

Glucose is a monosaccharide found in many fruits, and plants obtained through a process using enzymehydrolysis of starch saccharide. Sweet potato starch Hydrolisis run with three neck flask equipped with astirrer. In Liquifikasi stage, three-neck flask is inserted into the starch solution which has been set temperatureand the pH was added HCI and in the heat, then added α-amylase enzyme in a certain time. Saccharification second stage, where the results liquification cooled, set the temperature and pH on certain conditions. Then added enzyme giukoamilase by volume according to the specified variable, and incubated at a given time. At acertain time interval was taken a few examples of the analyzed samples will be analyzed glucose levels Process behavior observed in this study were changes in temperature, hydrolysis time and the addition of enzymes, the best hydrolysis results obtained at 60 ° C, pH 4.5 and the addition of 0.7 ml of glucoamylase and time hydrolysis 5 days with glucose levels reaching 5 , 65% and conversion yield of 66.8% and 22.59%.Key words: Sweet Potato Starch, Liquificationi, saccharifictsion, glucose, α-amylase enzyme
BIODIESEL FROM AVOCADO SEEDS BY TRANSESTERIFICATION PROCESS Risnoyatiningsih, Sri
Jurnal Teknik Kimia Vol 5, No 1 (2010): JURNAL TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v5i1.136

Abstract

The existence of Biodiesel as an alternative fuel from year to year has decreased quantity and will become lessand less because of rising demand. One source of biodiesel raw materials are seeds Avocadot.Seeds Avocadois still not utilized for other products, and avocado seeds contain fatty acid methyl esters of 71.715% asmaterial for biodiesel. The aim of this research is to make biodiesel from avocado seed oil so it can be used asalternative diesel fuels and also take advantage of avocado seed in order to have a high value in order to beprocessed into biodiesel. Operating conditions used was 10 ml volume of oil, transesterification temperature ±60 ° C, NaOH to oil weight ratio of 1% and stirring speed 600rpm. Also, studies conducted on the oil to methanolmole ratio 1:4, 1:6, 1:8, 1:10, 1:12 and with a variation of 5, 20, 35, 50 and 65 minutes. Peneliatianresults show that biodiesel meets the standard avocado seed oil as an alternative fuel in Indonesia because ithas a value of flash point between 130 ° C to 240 ° C and has a pour point value between -2 ° C to 9 ° C.Keywords: Seeds of avocado, transesterification, biodiesel.
HYDROLYSIS OF STARCH SACCHARIDES FROM SWEET POTATOES USING ENZYME Risnoyatiningsih, Sri
Jurnal Teknik Kimia Vol 5, No 2 (2011): JURNAL TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v5i2.146

Abstract

Glucose is a monosaccharide that is widely available in fruits, and plants obtained throughthe hydrolysis of starch saccharides using enzymes. Sweet potato starch hydrolysis is run by threeneckflask equipped with a stirrer. At stage Liquifikasi, three neck flask inserted into a solution ofstarch which has been set temperature and pH plus HCI and heated, then added α-amylase enzymein a certain time.Saccharification second stage, where the results liquifikasi cooled, set thetemperature and pH on certain conditions. Giukoamilase enzyme is then added to the volumeaccording to the specified variable, and incubated at a given time. At a certain time interval wastaken a few examples of the analyzed samples to be analyzed glucose levels. Process behaviorobserved in this study were changes in temperature, hydrolysis time and the addition of enzymes,the best hydrolysis results obtained at 60 0C, pH 4.5 and the addition of the enzyme glucoamylase,07 ml and the time hidrilisis 5 days with glucose levels reaching 5.65% and conversion yield of66.8% and 22.59%.Key words: Sweet Potato Starch, Liquifikasi, sakrifikasi, glucose
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