Diah Pratiwi

University of Bengkulu

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Dwi Joko Prasetyo

National Research and Innovation Agency

Andi Febrisiantosa

National Research and Innovation Agency

Hernawan Hernawan

National Research and Innovation Agency

Satriyo Krido Wahono

National Research and Innovation Agency

Tri Hadi Jatmiko

National Research and Innovation Agency

Andri Suwanto

National Research and Innovation Agency

Cici Darsih

National Research and Innovation Agency

Ahmad Iskandar Setiyawan

National Research and Innovation Agency

Roni Maryana

Indonesian Institute of Sciences

Wahyu Anggo Rizal

National Research and Innovation Agency

Cooperative Institutions

National Research and Innovation Agency

Indonesian Institute of Sciences

University of Brawijaya

National Nuclear Energy Agency of Indonesia

Universitas Gadjah Mada

IPB University

Universitas Gunung Kidul

Diponegoro University

Badan Pengkajian dan Penerapan Teknologi

University of Bengkulu

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DETAIL ENGINEERING TEMPAT PEMBUANGAN AKHIR (TPA) REGIONAL PEKALONGAN

DOAJ (DOAJ: Directory of Open Access Journals) (2012)

Badrus Zaman Syafrudin Syafrudin Diah Pratiwi

Regional Final Disposal (Regional Landfill) Pekalongan is place a waste serves 3 surrounding areas. The threeareas that served are Pekalongan City, Pekalongan Regency and Batang Regency. These areas are close enoughso that Regional Landfill concept is suitable to be applied in these areas. This Regional landfill is planned to usethe concept of sanitary landfills. Location of land to be used as Pekalongan Regional Landfill is locatedprecisely at the border village of Sengare-Batursari, District Talun in the administrative area of Pekalongan.The results of this study is the design of a sanitary landfill with landfill leachate channeling system, gasventilation equipment and various other supporting facilities, including weighbridge and procurement ofrequired heavy equipment. Approxymately costs required to build the design is Rp. 88.137.990.883,56

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Adsorption of Methylene Blue dye using Marine algae Ulva lactuca

IOP Conference Series Earth and Environmental Science (2019)

Diah Pratiwi Dwi Joko Prasetyo Crescentiana Dewi Poeloengasih

Contamination of dyes causes an aesthetic problem, severe public health concern and adds several serious environmental issues as a result of their resistance in nature and nonbiodegradable characteristic. Adsorption of methylene blue (MB) has been conducted by utilizing marine algae U. lactuca as biosorbent. In this study, the batch adsorption of Methylene blue dye using marine algae U. lactuca was examined. The ability of the U. lactuca in removing the dye color was dependent on contact time, algae biomass, dye concentration, and pH. The optimum adsorption was found at around pH 8; contact time 110 min; adsorbent dose 1,25 g/L; initial concentration 25 mg/L. The maximum percentage dye removal value was 91,92 %. This work confirms the potential use of U. lactuca for removing Methylene blue dyes solutions. Keywords: Methylene blue, Ulva lactuca, adsorption, biosorbent, removal of dyes

Ulva lactuca

Methylene blue

10.1088/1755-1315/251/1/012012

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Microbiological and Rheological Properties of Kefir in Different Combination Medium of Milk and Mung Bean Juice

BIO Web of Conferences (2025)

Ahmad Iskandar Setiyawan Nurliyani Nurliyani Widodo Widodo Taufik Kurniawan Angga Maulana Firmansyah

Indonesia has quality nut commodities. One of them, mung beans, is known to contain 22.75% protein. Kefir grains include lactic acid bacteria (LAB) in symbiosis with acetic acid bacteria and yeast. Its fermentation produced peptide bioactive, functional properties, probiotics, and inhibitory enzymes. This study evaluated kefir’s microbiological and rheological properties in mixed milk and mung bean juice media. The combination treatment (T) of milk (M) and mung bean juice (MB) as the kefir medium was M 90% + MB 10% (T1), M 80% + 20% MB (T2) and M 70% + 30% MB (T3). The results showed that the LAB and yeast no significantly different in each treatment. Rheological properties of kefir were determined by analyzing sample viscosity at different temperatures (5°C, 20°C, and 30°C). The results showed an increase in the percentage of mung bean juice, and temperature reduced the viscosity value. The highest viscosity value regression was T3 (82.75 mPa·s) at 5°C. The research concluded that combinations of milk and mung bean up to 30% do not affect microbiological properties but affect rheological properties.

Mung bean

Kefir

10.1051/bioconf/202515804006

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Identification photoprotective activity of marine seaweed: Eucheuma sp

IOP Conference Series Earth and Environmental Science (2021)

Rarasrum Dyah Kasitowati Adisti Istivari Wahyudi R Asmara Dian Aliviyanti Feni Iranawati

Abstract Skin cancer had become one of the most occurring type of cancer all around the world. The needs for alternative additional substance in sunscreen, especially from natural ingredients become important. Seaweed is one of marine natural resource known for its many benefits and widely used in cosmetic industries. The purpose of this research are to determine the photoprotective activity of Eucheuma sp. extract obtained from different type of solvents against ultraviolet radiation and its effect. Eucheuma sp. extracted by maceration using two different solvents (methanol and ethyl acetate). Filtrate obtained from maceration evaporated until the consistency are pasta-shaped and tested using spectrophotometer to determine the SPF, % of Te, and % Tp. The result of spectrophotometer tests evaluated and analyzed to determine which solvent generate the best value of SPF, % of Te, and % of Tp. The result of this this research showed that the highest SPF value are present in ethyl acetate extract (SPF 26.4). The best value of Te and Tp percentage are also present in the ethyl acetate extract with their respective values: 0.88% and 18.64%. The conclusion of this research are Eucheuma sp. extract had a good potential of photoprotective activity.

Maceration (sewage)

10.1088/1755-1315/679/1/012014

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Optimization of Cellulose Enzyme in the Simultaneous Saccharification and Fermentation of Sugarcane Bagasse on the Second-generation Bioethanol Production Technology

Energy Procedia (2014)

Satriyo Krido Wahono Cici Darsih Vita Taufika Rosyida Roni Maryana Diah Pratiwi

Sugarcane bagasse as raw material were treated on chemical delignification with NaOH and used for Simultaneous Saccharification and Fermentation (SSF). SSF was incubated during 5 days by adding Sacharomyches cereviceae, cellulose enzymes (Trichoderma reesei) and nutrients. The variable of this research was the cellulose enzyme variation of 10-60 fpu with 10 fpu on intervals. Optimal results were obtained on 60 fpu which producing ethanol content of 1.3544% or dry weight conversion of 21.3724 g/L with potential prediction shaped on logarithmic equation. In the advanced prediction can be obtained approximate optimal value of enzyme contents on 96.6802 fpu.

Bagasse

Enzymatic Hydrolysis

10.1016/j.egypro.2014.01.224

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Modification of Gunungkidul Natural Zeolite as Bioethanol Dehydrating Agents

Energy Procedia (2015)

Hernawan Hernawan Satriyo Krido Wahono Roni Maryana Diah Pratiwi

This research was conducted to characterize the modification of natural zeolite for dehydration of bioethanol. Modification have been conducted under various methods. Natural zeolite (ZA) was activated using hydrochloric acid (produced ZAAH), the ZAAH sample was heated in to microwave (produced ZAAHM), soaking of ZAAH and ZAAHM in NH4NO3 (produced ZAAHN and ZAAHMN). Zeolite characterization involved determination of total acid sites, zeolite crystallinity by X-ray diffraction and TO4 site by FTIR. Result showed that modified zeolite ZAAH have better properties compared by ZA, ZAAHM, ZAAHN and ZAAHMN. ZAAH potentially be used as dehydrating agents.

Hydrochloric acid

Clinoptilolite

10.1016/j.egypro.2015.01.042

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Optimization of Simultaneous Saccharification and Fermentation Incubation Time Using Cellulose Enzyme for Sugarcane Bagasse on the Second-generation Bioethanol Production Technology

Energy Procedia (2015)

Satriyo Krido Wahono Vita Taufika Rosyida Cici Darsih Diah Pratiwi Andri Frediansyah

Bioethanol production using lignocellulosic materials (the second-generation technology) was consist of pretreatment and simultaneous saccharification and fermentation (SSF) process. This research optimize the SSF incubation time using cellulose enzyme and Saccharomyces cerevisiae combination for sugarcane bagasse. The bagasse was pre-treated by delignification with NaOH. The SSF was conducted by Sacharomyches cereviceae, cellulose enzymes (Trichoderma reesei) and nutrients combination during 3 d, 5 d and 7 d as incubation time variables. The optimum result was 0.748 5% of ethanol concentration or dry weight conversion by 11.810 5 g · L–1 which obtained after 5 d incubation time based on ethanol conversion, microbiology test and sugar reduction concentration.

Bagasse

Enzymatic Hydrolysis

10.1016/j.egypro.2015.01.061

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Effect of phytase supplementation in ration containing eggshell powder on the performance of native chicken

AIP conference proceedings (2024)

Diah Pratiwi Mohamad Fatoni Ahmad Iskandar Setiyawan Sundari Sundari Anastasia Mamilisti Susiati

This study aimed to determine the effect of phytase in ration containing eggshell powder on the performances of native chickens. This study was designed using one-way ANOVA of the CRD method, consisting of 3 treatments, each consisting of 4 replications of 3 native chickens. R0: basal ration; R1: basal ration+phytase from L. Plantarum A1-E; and R2: basal ration + commercial phytase. The variables observed were feed consumption, gain, feed conversion ratio (FCR), and blood cholesterol content. The data were analyzed using one-way ANOVA and if there were differences, a DMRT further test was carried out. Phytase supplementation significantly affected (p<0.05) daily feed consumption. FCR was not affected by treatments. No significant differences in blood cholesterol levels were observed among the treatments, being R0=110.93 ± 63.63, R1=86.90 ± 15.65, and R2=101.95 ± 31.70 mg/dL in RO, R1, and R2, respectively. It was concluded that supplementation of phytase at a dose of 500 FTU/kg in a ration containing eggshell powder did not affect the performances of native chickens.

Phytase

Completely randomized design

10.1063/5.0184948

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The Effect of Adding Natural Zeolite Catalyst in Pyrolysis Multilayer Plastic Waste

Diah Pratiwi Agus Prasetya Hasnan Abimanyu

Plastic Waste

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The contribution of Lactobacillus acidophilus in improving the antimicrobial ability of bifidus milk

CRC Press eBooks (2024)

Yurliasni Elmy Mariana Zuraida Hanum R.R.B. Pasaribu Diah Pratiwi

Indigestion is one of the health problems that is still often encountered in society. Using fermented goat's milk containing probiotics is one alternative to overcome digestive problems. This research aimed to look at the contribution of Lactobacillus acidophilus in improving the antimicrobial ability of Bifidus milk as a probiotic milk to the growth of Salmonella sp and Escherichia coli. This research was conducted using a completely randomized design (CRD) consisting of 5 (five) treatments, namely P1 = 1%: 4%, P2 = 2%: 3%, P3 = 2.5%: 2.5%, P4 = 3%: 2%, P5 = 4%: 1%. Each treatment consisted of 4 replications so 20 were obtained from the experimental unit. Parameters measured are pH, total plate count (TPC), and the ability of antimicrobials to inhibit Salmonella sp and Escherichia coli. The results show that the pH and TPC of bifidus milk, namely 4.08–4.18 and 8.52 to 8.89 log CFU/ml respectively, are still within the SNI range. The width of the resulting zone of inhibition that the antimicrobials contained in bifidus milk are weak in inhibiting Salmonella and E. coli. It can be concluded that the contribution of L. acidophilus is not significant

10.1201/9781003468943-37

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