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Ratna Sri Harjanti
Politeknik LPP Yogyakarta
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Environmental Science Social Sciences Veterinary

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Journal : CHEMICA Jurnal Teknik Kimia

 1 
Optimasi Pengambilan Antosianin dari Kulit Buah Naga Merah (Hylocereus polyrhizus) Sebagai Pewarna Alami pada Makanan Harjanti, Ratna Sri
CHEMICA: Jurnal Teknik Kimia Vol 3, No 2 (2016): Desember 2016
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (418.116 KB) | DOI: 10.26555/chemica.v3i2.5922

Abstract

The addition of synthetic colors in foods in an attempt to attract the attention of consumers, not a ban, but if the dye used is a dye that is unusual for the food, it is harmful to health. One source of natural pigments that can be used is the red dragon fruit skin. These skins contain anthocyanins potential as a dye.             In this reasearch, the observed red dragon fruit skin moisture content and size of the powder. It also conducted a stirring speed variation during the extraction process. While variable temperature, time, and solvent refers to the optimum conditions of research that has been done. Analysis of the results was conducted to determine pH, anthocyanin concentration and yield results.             Based on the results obtained, the smaller the water content contained in the skin, giving absorbance values are higher. This shows that extractable anthocyanins levels are also higher. The lowest levels of the skin can be achieved in this study was 6%. The smaller the grain size, the higher the anthocyanin content. The smallest grain size achieved was 100 mesh. The highest mixing speed in this study was 300 rpm, the higher the stirring speed, the higher the anthocyanin content fetched.             Organoleptic tests were conducted to study the effect of anthocyanins on the quality of the food shows that the addition of anthocyanins provide the appropriate color and do not significantly affect flavor and aroma. So it can be used as a natural dye for food.
Pupuk Organik dari Limbah Pabrik Gula Madukismo dengan Starter Mikrobia Pengurai Untuk Menambah Kandungan N, P, K Harjanti, Ratna Sri
CHEMICA: Jurnal Teknik Kimia Vol 4, No 1 (2017): Juni 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (363.184 KB) | DOI: 10.26555/chemica.v4i1.6107

Abstract

Abstrak Blotong is sugar mill waste slude in the form of dark, often dumped, causing pollution and odor. Blotong produce about 3,8 % of cane milled by a sugar factory unit. While vinasse is waste water generated from the process of making alcohol. In the process of making one liter of alcohol will produce as much as 13 liters of vinasse. Vinasse contain many elements K, while blotong contains a lot of elements of N, P, dan Ca. This allows for composting blotong with the addition of vinasse to produce organis fertilizer. Blotong and vinasse may be seen in the PG Madukismo.Organic fertilizer through composting mixture of blotong and vinasse using microbial starter EM-4 and X-Compost can be done easily in the home environment. To determine the optimum process conditions to produce organic fertilizer, need to be varied ratio of blotong and vinasse. Composting reaction carried out for thirty days with observed in temperature and pH. Further analysis of N, P, K and C/N ratio.Based on the results obtained, the use of starter microbes X compost more prospective than using starter microbes EM-4. The compost produced by the starter microbes X-compost contains N, P, K which is much higher than the compost produced by the starter micobes EM-4. As for the addition of vinasse, will give optimum results in the addition of vinasse 25% of the weigth of blotong. Keywords: blotong, vinasse, compost, microbe
Biodiesel dari Limbah Pabrik Gula dan Minyak Jarak Pagar (Jatropha curcas) dengan Katalisator Zeolit Alam Klinoptilolite Harjanti, Ratna Sri; Rahmanta, Anugrah Perdana
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (487.964 KB) | DOI: 10.26555/chemica.v2i2.4565

Abstract

The fuel price increase with the increase of the number of transportation due to the increasing numbers of the population. Indonesia with more than 200 million people in need of transportation fuels in the form of gasoline and diesel in large quantities. Currently the main source of transportation fuels derived from petroleum. Premium production in Indonesia is about 62 million barrels and production of about 87 million barrels of diesel fuel. The product does not include the use for other needs, such as lubricating oil, kerosene, avgas, as well as other materials. This is particularly worrying given the oil reserves are dwindling. One of the alternative energy for transportation fuels is biodiesel as a substitute for diesel fuel.The castor oil has potential to be used as biodiesel. Fusel oil is a sugar mill waste containing alcohol. The reaction between castor oil and fusel oil with natural zeolite catalyst klinoptilolite be referred to as alcoholysis reactions that produce esters. Castor oil and fusel oil mixed with zeolite powder klinoptilolite that previously had been heated in a separate place until it reached its boiling temperature. Three neck flask fitted with a thermometer, hoses trailer makers, heater, and the agitator on 100 rpm with 100 oC of temperature. Snapshot taken at intervals of 30 minutes each. Conversion reaction calculated by analyzing the levels of glycerol bottom layer by means asetin. Alcoholysis fusel oil and castor oil with natural zeolite catalyst klinoptilolite produce esters that are approaching the properties of diesel oil with a calorific value of 19 119 Btu/lb. Optimum conversion of 57 % was obtained in alcohol - oil ratio of 9.29 mgek/mgek and the addition of a catalyst as much as 2.56% of the weight of oil.
Optimasi Pengambilan Antosianin dari Kulit Buah Naga Merah (Hylocereus polyrhizus) Sebagai Pewarna Alami pada Makanan Ratna Sri Harjanti
CHEMICA: Jurnal Teknik Kimia Vol 3, No 2 (2016): Desember 2016
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (418.116 KB) | DOI: 10.26555/chemica.v3i2.5922

Abstract

The addition of synthetic colors in foods in an attempt to attract the attention of consumers, not a ban, but if the dye used is a dye that is unusual for the food, it is harmful to health. One source of natural pigments that can be used is the red dragon fruit skin. These skins contain anthocyanins potential as a dye.             In this reasearch, the observed red dragon fruit skin moisture content and size of the powder. It also conducted a stirring speed variation during the extraction process. While variable temperature, time, and solvent refers to the optimum conditions of research that has been done. Analysis of the results was conducted to determine pH, anthocyanin concentration and yield results.             Based on the results obtained, the smaller the water content contained in the skin, giving absorbance values are higher. This shows that extractable anthocyanins levels are also higher. The lowest levels of the skin can be achieved in this study was 6%. The smaller the grain size, the higher the anthocyanin content. The smallest grain size achieved was 100 mesh. The highest mixing speed in this study was 300 rpm, the higher the stirring speed, the higher the anthocyanin content fetched.             Organoleptic tests were conducted to study the effect of anthocyanins on the quality of the food shows that the addition of anthocyanins provide the appropriate color and do not significantly affect flavor and aroma. So it can be used as a natural dye for food.
Pupuk Organik dari Limbah Pabrik Gula Madukismo dengan Starter Mikrobia Pengurai Untuk Menambah Kandungan N, P, K Ratna Sri Harjanti
CHEMICA: Jurnal Teknik Kimia Vol 4, No 1 (2017): Juni 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (363.184 KB) | DOI: 10.26555/chemica.v4i1.6107

Abstract

Abstrak Blotong is sugar mill waste slude in the form of dark, often dumped, causing pollution and odor. Blotong produce about 3,8 % of cane milled by a sugar factory unit. While vinasse is waste water generated from the process of making alcohol. In the process of making one liter of alcohol will produce as much as 13 liters of vinasse. Vinasse contain many elements K, while blotong contains a lot of elements of N, P, dan Ca. This allows for composting blotong with the addition of vinasse to produce organis fertilizer. Blotong and vinasse may be seen in the PG Madukismo.Organic fertilizer through composting mixture of blotong and vinasse using microbial starter EM-4 and X-Compost can be done easily in the home environment. To determine the optimum process conditions to produce organic fertilizer, need to be varied ratio of blotong and vinasse. Composting reaction carried out for thirty days with observed in temperature and pH. Further analysis of N, P, K and C/N ratio.Based on the results obtained, the use of starter microbes X compost more prospective than using starter microbes EM-4. The compost produced by the starter microbes X-compost contains N, P, K which is much higher than the compost produced by the starter micobes EM-4. As for the addition of vinasse, will give optimum results in the addition of vinasse 25% of the weigth of blotong. Keywords: blotong, vinasse, compost, microbe
Biodiesel dari Limbah Pabrik Gula dan Minyak Jarak Pagar (Jatropha curcas) dengan Katalisator Zeolit Alam Klinoptilolite Ratna Sri Harjanti; Anugrah Perdana Rahmanta
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (487.964 KB) | DOI: 10.26555/chemica.v2i2.4565

Abstract

The fuel price increase with the increase of the number of transportation due to the increasing numbers of the population. Indonesia with more than 200 million people in need of transportation fuels in the form of gasoline and diesel in large quantities. Currently the main source of transportation fuels derived from petroleum. Premium production in Indonesia is about 62 million barrels and production of about 87 million barrels of diesel fuel. The product does not include the use for other needs, such as lubricating oil, kerosene, avgas, as well as other materials. This is particularly worrying given the oil reserves are dwindling. One of the alternative energy for transportation fuels is biodiesel as a substitute for diesel fuel.The castor oil has potential to be used as biodiesel. Fusel oil is a sugar mill waste containing alcohol. The reaction between castor oil and fusel oil with natural zeolite catalyst klinoptilolite be referred to as alcoholysis reactions that produce esters. Castor oil and fusel oil mixed with zeolite powder klinoptilolite that previously had been heated in a separate place until it reached its boiling temperature. Three neck flask fitted with a thermometer, hoses trailer makers, heater, and the agitator on 100 rpm with 100 oC of temperature. Snapshot taken at intervals of 30 minutes each. Conversion reaction calculated by analyzing the levels of glycerol bottom layer by means asetin. Alcoholysis fusel oil and castor oil with natural zeolite catalyst klinoptilolite produce esters that are approaching the properties of diesel oil with a calorific value of 19 119 Btu/lb. Optimum conversion of 57 % was obtained in alcohol - oil ratio of 9.29 mgek/mgek and the addition of a catalyst as much as 2.56% of the weight of oil.
Co-Authors Andari, Yuni Anna Kusumawati Anna Kusumawati Arif Hidayat Azhari Rizal Azhari Rizal Bagaskara, Bagaskara Banowati, Galuh Budiansyah, Andi Dwi Aryani Suryangingrum Dwi Aryani Suryaningrum Dyah Puspasari, Dyah Fachrizal Fachrizal, Fachrizal Hamami, Rahmi Sabrina Hartini Hartini , dkk Helmi, Rahmi Lestari Kusumawati, Anna Maulana, Syahrizal Mia Dwi Etafiana Muhammad Mustangin Muhammad Mustangin Mundhir Muktafa Mustangin, Muhammad Purnomosidi, RY Kun Haribowo Rahmanta, Anugrah Perdana Retno Muningsih rina ekawati Rizal, Azhari Romadona, Mia Rahma Saputri, Lestari Hetalesi Sarto Sarto Sarto Shodiqin, Mohammad Sigit Setiawan Suryadi Suryadi Suryaningrum, Dwi Aryani Tsuraya, Silmi Yunaidi Yunaidi yunaidi yunaidi Yunaidi Yunaidi