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3. Alkaline Pretreatment Optimization of Tobacco Stalks for Bioethanol Production

Author

Palupi, Bekti, Fitriati, Diana, Vinkarisma, Devadha Halida, Fachri, Boy Arief, Rahmawati, Istiqomah, Rizkiana, Meta Fitri, Amini, Helda Wika, Chan, Albert P. C., Series Editor, Hong, Wei-Chiang, Series Editor, Mellal, Mohamed Arezki, Series Editor, Narayanan, Ramadas, Series Editor, Nguyen, Quang Ngoc, Series Editor, Ong, Hwai Chyuan, Series Editor, Sachsenmeier, Peter, Series Editor, Sun, Zaicheng, Series Editor, Ullah, Sharif, Series Editor, Wu, Junwei, Series Editor, Zhang, Wei, Series Editor, Susanti, Elly, editor, Juhari, Juhari, editor, and Jauhari, Mohammad Nafie, editor

Published
2023
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6. Pemberdayaan Ekonomi Masyarakat Pantai Payangan dengan Pengembangan Produk Sirup dari Buah Perepat (Sonneratia alba)

Author

Akhsan, Maulana Yudha, primary, Khoirunnissa, Aulia, additional, Ardianti, Nanda Melani, additional, Yahya, Ahmad Daily, additional, Salsabila, Nida Ayu, additional, Pratiwi, Widya Septaningtyas, additional, Bestari, Cherobina Bida Ayu, additional, Akbar, Muhammad Faqihuddin, additional, Kurniawan, Muhammad Rizky, additional, Andikasari, Emi, additional, and Palupi, Bekti, additional

Published
2024
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12. Optimization of Microwave Ultrasound Extraction of Ulvan Biopolymer from Ulva lactuca using Response Surface Methodology

Author

Rahmawati, Istiqomah, Annisa, Yasmin, Farwah, Zilma Aliyah, Adrian, Febri, Anggraini, Ranita Anggi, Fachri, Boy Arief, Reza, Muhammad, Rizkiana, Meta Fitri, Palupi, Bekti, Amini, Helda Wika, Rahmawati, Istiqomah, Annisa, Yasmin, Farwah, Zilma Aliyah, Adrian, Febri, Anggraini, Ranita Anggi, Fachri, Boy Arief, Reza, Muhammad, Rizkiana, Meta Fitri, Palupi, Bekti, and Amini, Helda Wika

Abstract

This study aims to determine the effect of combining the two extraction methods Microwave Assisted Extraction (MAE) and Ultrasound-Assisted Extraction (UAE) on the yield and content of ulvan polysaccharides from Ulva lactuca with the best operation condition. Algae biomass U. lactuca is abundant, according to its content, U. lactuca contains polysaccharides which can be used as biodegradable plastic materials. The extraction was carried out using Microwave Ultrasound Extraction by varying the microwave power from 100 to 800 watts, the microwave time variations from 10 to 50 minutes, the ultrasonic wave temperature range from 40-80 oC, and the ultrasonic wave time variations from 20 to 50 minutes. Optimization was performed using the response surface methodology center composite design methodology for a total of 28 runs. Several tests were carried out to determine the character of the ulvan polysaccharide, including water content, FT-IR spectroscopy, High-Performance Liquid Chromatography, and its antioxidant activity. The effect of combining Microwave Assisted Extraction (MAE) and Ultrasound-Assisted Extraction (UAE) provides an optimal extraction condition with higher yields and good quality ulvan.

Published
2023

18. Effect of Time Variation on Chlorophyll Concentration in Cocoa Leaf Extraction using the UAE (Ultrasonic Assisted Extraction) Method

Author

Rahmawati, Istiqomah, Shabrina, Nadhilah, Fachri, Boy Arief, Amini, Helda Wika, Palupi, Bekti, Rizkiana, Meta Fitri, Nurtsulutsiyah, Nurtsulutsiyah, Pradipta, Shima Nuril, Afwal, Diza Raudhatul, Reza, Muhammad, Rahmawati, Istiqomah, Shabrina, Nadhilah, Fachri, Boy Arief, Amini, Helda Wika, Palupi, Bekti, Rizkiana, Meta Fitri, Nurtsulutsiyah, Nurtsulutsiyah, Pradipta, Shima Nuril, Afwal, Diza Raudhatul, and Reza, Muhammad

Abstract

Until now, Cocoa (Theobroma cacao L.) plantation is a sector that has been continuously cultivated. Cocoa leaves contain chlorophyll, which is an important pigment in photosynthesis as sunlight absorber. The aim of this study is to determine the effect of extraction time to the concentration of chlorophyll in cocoa leaves. The extraction time was varied from 5 to 25 min with constant variables, namely power and ratio of raw materials. In this study, Ultrasonic Assisted Extraction (UAE) method was used due to its effectiveness. The concentration of obtained chlorophyll was determined by using UV-Vis spectrophotometry. The optimum extraction time was 15 min producing concentration of chlorophyll a of 9.39 mg/L, chlorophyll b of 4.78 mg/L, and total chlorophyll of 14.16 mg/L., Until now, Cocoa (Theobroma cacao L.) plantation is a sector that has been continuously cultivated. Cocoa leaves contain chlorophyll, which is an important pigment in photosynthesis as sunlight absorber. The aim of this study is to determine the effect of extraction time to the concentration of chlorophyll in cocoa leaves. The extraction time was varied from 5 to 25 min with constant variables, namely power and ratio of raw materials. In this study, Ultrasonic Assisted Extraction (UAE) method was used due to its effectiveness. The concentration of obtained chlorophyll was determined by using UV-Vis spectrophotometry. The optimum extraction time was 15 min producing concentration of chlorophyll a of 9.39 mg/L, chlorophyll b of 4.78 mg/L, and total chlorophyll of 14.16 mg/L.   Keywords: Chlorophyll, Cocoa Leaves, UV-Vis Spectrophotometry, Ultrasonic Assisted Extraction

Published
2022

19. Biobutanol Production from Cocoa Pod Husk Through a Sequential Green Method: Depectination, Delignification, Enzymatic Hydrolysis, and Extractive Fermentation

Author

Muharja, Maktum, primary, Darmayanti, Rizki Fitria, additional, Fachri, Boy Arief, additional, Palupi, Bekti, additional, Rahmawati, Istiqomah, additional, Putri, Ditta Kharisma Yolanda, additional, Amini, Helda Wika, additional, Setiawan, Felix Arie, additional, Asrofi, Mochamad, additional, Widjaja, Arief, additional, and Halim, Abdul, additional

Published
2022
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23. Optimization of Microwave-Assisted Alkali Pretreatment for Enhancement of Delignification Process of Cocoa Pod Husk

Author

Muharja, Maktum, primary, Darmayanti, Rizki Fitria, additional, Palupi, Bekti, additional, Rahmawati, Istiqomah, additional, Fachri, Boy Arief, additional, Setiawan, Felix Arie, additional, Amini, Helda Wika, additional, Rizkiana, Meta Fitri, additional, Rahmawati, Atiqa, additional, Susanti, Ari, additional, and Putri, Ditta Kharisma Yolanda, additional

Published
2021
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30. The Effect of Feed Rate And Recycle Rate Variable On Leaching Process Of Na2Zro3 With HCl In Continuous Stirred Tank Reactor (CSTR) Series.

Author

Palupi, Bekti, Supranto, Sediawan, Wahyudi Budi, and Setyadji, Moch.

Subjects
*LEACHING, *NATURAL resources, *ZIRCON, *ZIRCONIUM, *CERAMICS, *NUCLEAR industry
Abstract

This time, the natural resources of zircon sand is processed into several zirconium products which is utilized for various industries, such as ceramics, glass industry, metal industry and nuclear industry. The process of zircon sand into zirconium products through several stages, one of them is leaching process of Na2ZrO3 with HCl. In this research, several variations of recycle-rate/feed-rate had been done to determine the effect on leaching process. The leaching was processed at temperature of 90°C, ratio of Na2ZrO3:HCl = 1g:30mL, and 142 rotary per minute of stirring speed for 30 minutes with variation of recycle-rate/feed-rate such as 0.478, 0.299, 0.218, 0.171 and 0.141. The diameter size of Na2ZrO3 powder that used are 0.088 to 0.149 mm. This process was carried out in Continuous Stirred Tank Reactor (CSTR) series with recycle. Based on this research, the greater of the recycle-rate/feed-rate variable, the obtained Zr recovery decreased. The correlation between recycle-rate/feed-rate and Zr recovery is shown by the equation y = -146.91x + 103.51, where y is the Zr recovery and x is the recycle-rate/feed-rate. The highest Zr recovery was 90.52% obtained at recycle-rate/feed-rate 0.141. The mathematical modeling involving the probability model P(r) = 2β 2r3 exp(-βr2) can be applied to this leaching process with Sum of Squared Errors (SSE) values in the range of 6x10-7 - 7x10-6. [ABSTRACT FROM AUTHOR]

Published
2017
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