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All Journal GEMA TEKNOLOGI METANA Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik ASEAN Journal of Chemical Engineering Journal of Vocational Studies on Applied Research Eduvest - Journal of Universal Studies

Isti Pudjihastuti

Department Of Industrial Chemical Engineering, Vocational School, Diponegoro University

Author-ID : 348167

Aerospace Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Engineering Health Professions Neuroscience Social Sciences

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FORMULASI BIOADITIF SUPER “RON BOOSTER“ PADA BAHAN BAKAR MINYAK MELALUI EKSTRAKSI MINYAK SEREH WANGI (CITRONELLA OIL) MENGGUNAKAN GELOMBANG MIKRO Heri Dwi Agustian; Dwi Anggryani S; Hendro Baskoro; Amalia Khoirunnisa; Isti Pudjihastuti; Fariza Siswanti
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2014): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 5 2014
Publisher : Prosiding SNST Fakultas Teknik

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Sektor energi memiliki peranan penting dalam mendukung pembangunan berkelanjutan karena segala aktivitas manusia membutuhkan pasokan energi. Kebijakan energi nasional mentargetkan 5% kebutuhan energi nasional harus dapat dipenuhi melalui pemanfaatan biofuel sebagai energi terbarukan karena pembakaran dari BBM mengakibatkan pencemaran udara dan global warming. peningkatan proses pembakaran dapat melalui penambahan aditif, oleh sebab itu perlu adanya eksplorasi bioaditif sebagai senyawa tambahan dalam bahan bakar. Salah satu alternatif aditif yang baik dan ramah lingkungan adalah minyak atsiri. Diantara 14 jenis minyak atsiri yang menjadi komoditi ekspor adalah minyak Serai Wangi. Minyak serai wangi diprediksi mempunyai karakteristik yang mendekati karakteristik bahan bakar, seperti berat jenis, titik didih, dan sifat mudah menguap. Proses ekstrak diharapkan akan mendongkrak produktifitas dan kualitas kandungan minyak serai wangi. Proses yang ditawarkan adalah ekstraksi minyak sereh wangi menggunakan gelombang mikro. Prinsip pemanasan menggunakan gelombang mikro bedasarkan tumbukan langsung dengan material polar atau solvent dan diatur oleh dua fenomena yaitu konduksi ionik dan rotasi dipol. Hasil dari penelitian ini berupa senyawa bioaditif yang dicampurkan dengan BBM dan meningkatkan cetane number dan octane number. Variabel berubah yang digunakan adalah proes ekstraksi dengan suhu 40°C dan 60° C, serta pelarut n-heksan dan etanol . setelah didapat ekstrak bioaditif kemudian dicampur dengan BBM dengan formulasi perbandingan bioaditif minyak sereh wangi : BBM ( Solar atau Bensin ) adalah rentang 0,1-1 : 100 Dan diilkukan pengujian Gas Chromatografi dan cetane-octane number.Rendemen maksimal berada pada suhu 70oC dengan pelarut ethanol selama 2 jam ekstraksi. Formulasi ang efisien untuk penambahan pada BBM berada pada rasio 3% dengan peningkatan angka cetana dari point 48 menjadi 50. Kata Kunci : Energi, Bioaditif. Minyak Sereh Wangi, Ekstraksi, Gelombang Mikro

REKAYASA PROSES PEMBUATAN SERBUK PEWARNA BATIK BIODEGRADABLE BERBAHAN ANTOSIANIN LIMBAH KULIT TERONG BELANDA (Chypomandra betacea) DENGAN KOMBINASI EKSTRAKSI GELOMBANG ULTRASONIK DAN AQUASOLVENT Yoga Asmara; Aji Bayu K; Septian Adi G.P; Fajar Aini; Isti Pudjihastuti
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2013): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 4 2013
Publisher : Prosiding SNST Fakultas Teknik

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Dewasa ini Batik telah menjadi trend baru dikalangan masyarakat. Meningkatnya trend juga diiringi dengan peningkatan produksi oleh para pengrajin di kalangan masyarakat. Namun akibat perkembangan IPTEK , banyak diantara pengrajin yang lebih memilih menggunakan pewarna sintetik yang jauh lebih berbahaya sehingga dirasa perlu untuk dilakukan diversifikasi ke pewarna alami.Banyak disekitar kita beberapa bahan yang dapat digunakan sebagai pewarna, tetapi memanfaatkan limbah adalah pilihan yang tepat dan salah satunya adalah limbah Kulit Terong Belanda yang mengandung Antosianin (Astawan, 1997). Sayangnya selama ini dibeberapa daerah seperti Wonosobo, Terong Belanda hanya dimanfaatkan buahnya saja. Rekayasa proses ekstraksi dilakukan dengan mengkombinasikan gelombang ultrasonic dan aquadest pada suhu 300 400 500 600 selama 30, 60, 90, 120 menit pada pH = 1 dengan tambahan asam asetat. Ekstraksi ultrasonik dipilih karena akan membuat proses ekstraksi lebih cepat dan bersifat yang tidak merusak. Hasil menunjukkan rendemen Antosianin yang terekstrak paling besar adalah pada perlakuan 500 selama 60 menit dengan hasil 23,78 mg/100 gr. Selanjutnya ekstrak akan dijadikan serbuk secara drying dan kristalisasi dengan penambahan maltodekstrin 10 % v/v untuk kemudian dicobakan terhadap Batik.Kata Kunci : Cyphomandra betacea, Ekstraksi Gelombang Ultrasonik, Pewarna Batik.

TEKNIK IMOBILISASI ENZIM SECARA ENTRAPMENT DALAM SINTESIS METIL ESTER BERBAHAN MINYAK JELANTAH Aji Bayu Kurniawan; Nurul Laeli; Asti Putri Puspitasari; Isti Pudjihastuti
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2014): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 5 2014
Publisher : Prosiding SNST Fakultas Teknik

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Peningkatan kebutuhan komsumsi energi dunia tentu akan membuat cadangan minyak semakin menipis belakangan ini sehingga wacana renewable energi kian di eksplorasi oleh berbagai pihak, salah satu yang mulai digencarkan adalah biodiesel Namun selama ini, pembuatan biodiesel yang dilakukan secara transesterifikasi dengan reaktan methanol dan katalis basa memiliki banyak kelemahan yaitu terjadinya reaksi penyabunan dan sulit dipisahkan karena katalisnya homogen sehingga saat ini dikembangkanlah enzim sebagai katalis yang memiliki keunggulan dimana memiliki aktivitas spesifik dan mudah dipisahkan karena katalisnya heterogen. Mengingat harga yang mahal maka dilakukanlah imobilisasi dalam matrik agar enzim dapat dipakai berulang dan menghemat biaya dalam sistem kontinyu. Penelitian dimulai dengan mengaktivasi zeolit sebagai matriks support, dilanjutkan dengan imobilisasi enzim dalam zeolit untuk selanjutnya proses sintesa biodiesel pada suhu 37 ºC selama 50 jam 150 rpm dengan rektan metil asetat. Setelah biodiesel dihasilkan maka dilakukan uji analisa secara kuantitatif dengan HPLC dan kualitatif serta uji performa.Hasil menunjukkan bahwa perbandingan minyak jelantah : metil asetat sebesar 1:12 dengan kompossisi enzim 3% akan menghasilkan biodiesel dengan konsentrasi 4,35 mol/t. Kata kunci: Biodiesel, Imobilisasi enzim, Metil Asetat, Minyak jelantah.

PENGARUH RASIO BAHAN BAKU TEPUNG KOMPOSIT (UBI KAYU, JAGUNG DAN KEDELAI HITAM) PADA KUALITAS PEMBUATAN BERAS ANALOG Isti Pudjihastuti; Edy Supriyo; Hafiz Rama Devara
Gema Teknologi Vol 21, No 2 (2021): October 2020 - April 2021
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v21i2.32923

The increase population affects an increase in total of consumption of Indonesian people towards rice, which encourages Indonesia to import rice. One of the alternatives that can be done is by using potential non-rice raw materials such as tubers. In this study, the raw materials for composite flour from cassava (Manihot esculenta), corn (Zea mays) and black soybeans (Glycine Sojo) were used, which are the basic ingredient for analog rice. The purpose of this study was to examine the effect of raw material composition on nutritional value (carbohydrate, protein, fat, water and ash content) analog rice compared to ordinary rice, examine the physico-chemistry (kamba density, water absorption and cooking time) of analog rice compare to paddy rice and also to define raw material composition and best temperature, organoleptic test covering color, aroma, texture and taste. The process of making analog rice consists of several stages of research, such as the stage of making composite flour, cooking the composite flour dough, making analog rice, drying analog rice and analyzing the results. The variables used were the ratio of flour composition and the effect of extrusion temperature. Based on proximate analysis on various compositions, obtained sample 5 (60% cassava flour, 15% corn flour and 25% black soybean flour) as analog rice with the best formulation. Based on the proximate analysis of the effect of temperature, the temperature was 75 °C as the optimum temperature for the extraction process. The results of the physical analysis of the best analog rice in this study showed that analog rice from a composite of cassava flour, corn flour and black soybean flour had a kamba density of 0.46 g / mL, a water absorption capacity of 60.52% and a cooking time of 46 minutes. In this sample, analog rice has a texture, aroma and appearance similar to rice in general, although analog rice from composite flour tends to have a savory taste arising from black soybeans.

Physicochemical and Rheological Properties of Sago (MetroxylonSagu) Starch Modified with Lactic Acid Hydrolysis and UV Rotary Drying Siswo Sumardiono; Rizki B Rakhmawati; Isti Pudjihastuti
ASEAN Journal of Chemical Engineering Vol 18, No 2 (2018)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Modification of sago starch using acid hydrolysis will change some physicochemical and rheological properties. Sago is easy to grow in tropical areas of coastal areas, many found in eastern Indonesia has a simple ergonomic terms. Ingredients of sago starch is consist of 20-30% amylose and 70-80% amylopectin which make sago starch difficult to dissolve in cold water, easy to gelatinize, high viscosity, hard and not expands in baking process. This study will analyse modified sago using lactic acid hydrolysis method and use UV rotary drying for 20 minutes. The properties of modified sago starch were observed i.e. pH, density, solubility, swelling power, and baking expansion. Time variables hydrolysis is 10; 15; 20; 25; and 30 minutes with a rotation speed of 8 rpm at room temperature. The results showed that the solubility, swelling power and baking expansion was increase. The density results showed that the longer acid hydrolysis time can make the smaller in the density. Solubility and swelling power showed increasing significantly compared to native sago starch. Modification by using UV light changes significantly the properties characteristics of product.

ASIDOLISIS ENZIMATIK MINYAK IKAN TUNA( THUNNUS THYNNUS) MENJADI PRODUK ASAM LEMAK KAYA OMEGA-3 DENGAN PEMANFAATAN LIPASE GETAH PEPAYA (carica papaya latex) Wahyuningsih Wahyuningsih; Isti Pudjihastuti; Heny Kusumayanti
METANA Vol 7, No 01 (2011): Juli 2011
Publisher : Universitas Diponegoro

ABSTRACT Incorporation of omega-3 polyunsaturated acids (n-3 PUFA) into Tuna (Thunnus thynnus) fish oil was investigated by using acidolysis enzimatis Process. The product of this modification is expected to be used as an ingredient nutrifition food products, especially in milk and baby food as well as pregnant and lactating The purpose of this study was to optimizing the used of lipased papaya latex (Carica papaya latex) in the product to incorporation fatty acids rich in omega-3.Bioreactor acidolysis enzematik development and Optimization of process the productivity of fatty acids rich in omega-3. Reaction Acidolysis was conducted between tuna (thunnus thynnus) fish oil by microbial lipase (5% of the weight of the substrate mixture) or vegetable lipased (Carica papaya latex) (6-10% by weight subtract mixture) as biocatalist.Acidolysis mixture the bioreactor at 40 o C for (2-6 hours) and the stirring speed of 200 rpm, pH (4.5 to 6.5). to eliminate free fatty acids from the product acidolysis performed neutralization with NaOH The results are expected to show that the lipase papaya latex (Carica papaya latex) can be used as biocatalyst incorporated omega-3 fatty acids in tunaIthunnus thunnyl) fish oil . In this study sought conditions for optimum incorporation rate, ie the use of papaya latex lipase concentration of 8%, the ratio of concentrations of omega-3 fatty acid and palm oil (1:1), pH = 5.5, Optimal time of 4 hours and the temperature (40oC) . The results were analyzed incorporation of omega-3 (EPA and DHA) with GC.EPA generated: 3.57% and DHA = 3.91% Key word:Acidolysis,Tuna fish oil

OPTIMASI PRODUKSI PROTEIN SEL TUNGGAL DARI BAGASE TERHIDROLISA DENGAN FERMENTASI OLEH SACCAROMYCES CEREVICEAE Isti Pudjihastuti; Margaretha T S; Wahyuningsih Wahyuningsih; Edy Supriyo
METANA Vol 8, No 02 (2012): Desember 2012
Publisher : Universitas Diponegoro

The Came pulp (bagase) were main contained cellulose, through process delignification and hidrolized can be used to growting sacaromyces cereviceae yeast as fermented media, so can produced biomass microbial as known as single cell protein (SCP).Design experiment was random block with treatment nutrient added as long as fermented process. The measured parameter were protein contained in microbial biomass with Kehjdahl method. Optimum result were formed to 8 days fermentation and nutrient added (NH4)2SO4:1 gr,MgSO47H2O : 0,5 gr, molase (tetes) 20% : 2 ml to media 50 gr. Key word: bagase, Saccaromyces Cereviceae,SCP

Perancangan Pengering Berinsulasi Dengan Aplikasi Pengeringan Ikan Tengiri Wahyuningsih Wahyuningsih; Isti Pudjihastuti
METANA Vol 12, No 2 (2016): Desember 2016
Publisher : Universitas Diponegoro

Prinsip Dasar Rancang Bangun Alat Pengering, peubah-peubah yang harus diperhatikan antara lain Sifat – sifat bahan yang akan dikeringkan,karakteristik pengeringan dari bahan, aliran panas, kualitas produk, fasilitas sekeliling,kapasitas alat,Dari faktor – faktor tersebut diharapkan untuk mendapatkan alat pengering dengan kinerja yang berdayaguna dan berhasil guna. Tujuan dari penelitian ini adalah merancang dan membangun alat pengering ikan berinsulasi untuk memperbaiki proses pengeringan ikan tradisional,meningkatkan nilai gizi, hygiene dan keamanan pangan dan mengaplikasikan alat pengering pada pengeringan ikan teri (Stolephorus heterolobua), serta mengetahui kwantitas asam lemak omega-3. Alat pengering hasil rancang bangun, ukuran 1 m x 1,2m x1,75 m, ukuran kolektor 1,2 m x 0,6 m, dapat dimanfaatkan untuk mengeringkan ikan teri (Stolephorus heterolobua) secara higienis dan mempertahankan kualitas produk Lama pengeringan 72 jam memberikan hasil ikan kering yang memenuhi standar kadar air , untuk pemanas surya kadar air 2,45 %, untuk pemanas buatan kadar air 2,65% Produk yang disukai adalah pengeringan dengan kadar garam 6% Pada produk yang dapat diterima memberikan nilai EPA 0,5972 gr/100 gr, dan DHA 0,4032 gr/100 gr, nilai TBA 1,21 mgr/kg, TVB : 7,04mgr N/100gr,TMA : 5,11 % mgr N. Design of Insulated Dryers Application for Tengiri Fish Dryer Basic Principles of Design Tools dryer, variables that must be considered among other properties - properties of the material to be dried, the characteristic drying of the material, heat flow, quality of products, the facilities around, the capacity of the tool, From factors - these factors are expected to get drier the performance of a very powerful and effective. The aim of this study was to design and build insulated fish dryers to improve the traditional fish drying process, enhance nutritional value, food safety and hygiene and to apply drier at drying anchovy (Stolephorus heterolobua), as well as to know the quantity of omega-3 fatty acids. Drier the result of design, size 1m x 1.2m x1,75 m, collector size of 1.2 mx 0.6 m, can be used for drying fish (Stolephorus heterolobua) hygienically and maintain the quality of products Lama drying 72 hours results dried fish that meets dtandar water content, for solar heating water content of 2.45%, for artificial heating water content of 2.65% preferred product is dried with saline 6% On acceptable products value EPA 0.5972 gr / 100 g and 0.4032 g DHA / 100 g, the value of TBA 1.21 mgr / kg, TVB: 7,04mgr N / 100gr, TMA: 5.11% N mgr

Making Silica Gel by Utilizing Candlenut and Palm Oil Shell Ash Muhammad Azhar Shiddiq; Isti Pudjihastuti
Eduvest - Journal of Universal Studies Vol. 1 No. 3 (2021): Journal Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Oil palm shell ash which is the result of boiler combustion inindustry has the potential to pollute the environment and have a badimpact in the long term so that special treatment is needed. Thisstudy aims to answer this problem by making silica gel fromhazelnut shell and oil palm shell ash with variations in the type ofacid and the ratio of ash to determine the effect of the type of acidand the ratio of the raw material in the form of ash to moisturecontent and water absorption of silica gel. Oil palm shell ash is usedas the main ingredient because it contains the most SiO2compounds compared to other compounds (reaching 39.78%).Candlenut shell is also used as a raw material for silica gel becauseit contains silica (12.58%). The stages in this research include thepretreatment process of the material by washing and drying thematerial, the combustion process of the main ingredient in thefurnace, the process of making sodium silicate and the synthesisprocess of silica gel. Then proceed with water content analysis,analysis of water absorption by silica gel and characterization byScanning Electron Microscope. The results of this study were thatthe type of acid, the concentration of the acid and the time ofmaturation of the gel had an influence on the moisture content ofthe silica gel and the absorption capacity of the silica gel. The silicagel produced using H2SO4 produced more mass than the silica gelusing HCl.

The Effectiveness of Biosorbent from Chicken’s Egg Shell and Durian Peel towards the Quality of Biodiesel Product from Waste Cooking Oil Kristanto, Dwi; Pudjihastuti, Isti; Amalia, Rizka
Journal of Vocational Studies on Applied Research Volume 3, Issue 2, Year 2021 (October 2021)
Publisher : Vocational College of Universitas Diponegoro

Indonesia is the largest exporter of palm oil with 85 - 90% of the world's total palm oil production. The consumption of palm oil in Indonesia is increasing every year, thus the waste are also increase. Waste cooking oil contains carcinogenic substances which causes various diseases. Biodiesel is an environmentally friendly substitute fuel for diesel made from vegetable oil as raw material. Used cooking oil can be used as raw material for biodiesel production, but it needs to be purified before further processing. Chicken egg shell contains 90% of CaCO3 can be used as a biosorbent of used cooking oil. Durian skin contains 50% - 60% of cellulose also has the potential as a biosorbent. This research was conducted to investigated the effectiveness of the combination of chicken egg shell biosorbent with durian skin for the purification process of used cooking oil as a raw material of biodiesel. Biosorbent was produced by carbonization process in a furnace at a temperature of 550oC for durian skin and 9000C for chicken egg shells. The results show that the acid number of used cooking oil has met the parameters of the SNI 3741: 2013, namely 0.43 mgKOH / gr and FFA levels of 0.0024% with a yield of 62.76%. The purified cooking oil was then continued with the transesterification process to produced biodiesel. The biodiesel obtained had the cetane numbers B100 of 33.8 and B30 of 45.2.

Co-Authors Aji Bayu K Aji Bayu Kurniawan Alvina, Raissa Wahyu Amalia Khoirunnisa Asti Putri Puspitasari Broto, R.T.D. Wisnu Dwi Anggryani S Dwi Kristanto Edy Supriyo Edy Supriyo Fahmi Arifan Fajar Aini Fariza Siswanti Hafiz Rama Devara Hendro Baskoro Heny Kusumayanti Heri Dwi Agustian Hermawan Dwi Ariyanto Hidayatna, Deden Margaretha T S Margaretha Tuti Susanti Mohamad Endy Y Yulianto Muhammad Azhar Shiddiq Nurul Laeli Retno Hartati Rizka Amalia Rizki B Rakhmawati RTD Wisnu Broto Septian Adi G.P Siswanto, Anggun Puspitarini Siswo Sumardiono Solarbesain, Frengky Hutama Putra Wahyuningsih Wahyuningsih Wahyuningsih Wahyuningsih Yoga Asmara Yudanto, Yusuf Arya

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