Ultrasound-assisted weak-acid hydrolysis of crystalline starch nanoparticles for chemical enhanced oil recovery

2020 ◽  
Vol 148 ◽  
pp. 1251-1271 ◽  
Author(s):  
Augustine Agi ◽  
Radzuan Junin ◽  
Agus Arsad ◽  
Azza Abbas ◽  
Afeez Gbadamosi ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Weak Acid ◽  
Starch Nanoparticles ◽  
Ultrasound Assisted ◽  
Hydrolysis Of

scholarly journals Intensifying the synthesis of starch nanoparticles using ultrasound-assisted acid hydrolysis method

2021 ◽  
Author(s):  
Vikas S Hakke ◽  
Shirish Sonawane ◽  
Sivakumar Manickam ◽  
Sami Boufi ◽  
Dipak V Pinjari ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Acid Concentration ◽  
Ultrasound Irradiation ◽  
Starch Granules ◽  
Surface Charges ◽  
Hydrolysis Method ◽  
Starch Nanoparticles ◽  
Ultrasound Assisted ◽  
Size And Morphology ◽  
Time Required

Abstract In the present study, an intensified approach for the synthesis of starch nanoparticles (SNPs) was demonstrated by using ultrasound-assisted acid hydrolysis method. The conventional acid hydrolysis for the synthesis of SNPs was intensified using ultrasound. The overall time required to convert starch granules to SNPs in the conventional acid hydrolysis method (48 h) was significantly reduced to 45 min by simultaneous acid hydrolysis and ultrasound irradiation. The acid concentration was found to be an important parameter for obtaining the desired size and morphology of the synthesized SNPs. The variation in the surface charges associated with the SNPs was confirmed through measuring their zeta potential. These potential charges on the surface of SNPs induce crystal growth among the synthesized nanoparticles. The irregular crystal morphology at higher acid concentration clearly shows SNPs' attachment with each other by coalescence. The higher crystallinity for SNPs was observed at low acid concentration; however, the lower acid concentration (0.5 M) leads to the smaller particle size of SNPs from 40 to 60 nm, with the overall yield of 23%. The proposed ultrasound method is more efficient and reproducible for the synthesis of SNPs for various applications.

scholarly journals Ultrasound-Assisted Ultra-Mild-Acid Hydrolisis of -Carrageenan

REAKTOR ◽  
2018 ◽  
Vol 17 (4) ◽  
pp. 191
Author(s):  
Ratnawati Ratnawati ◽  
Nita Indriyani
Keyword(s):  
Molecular Weight ◽  
Acid Hydrolysis ◽  
Average Molecular Weight ◽  
Weight Fraction ◽  
Number Average Molecular Weight ◽  
Hydrolysis Process ◽  
Higher Temperature ◽  
Ultrasound Assisted ◽  
Hydrolysis Of ◽  
Mild Acid

The low molecular weight fraction of κ-carrageenan is useful in biomedical applications. An ultrasound-assisted acid hydrolysis of κ-carrageenan has been studied. κ-carrageenan with an initial number-average molecular weight of 629 kDa was dispersed in distilled water to form a 5 g/l solution. The pH (3 and 6) of the solution was adjusted by adding HCl solution. The depolymerization reaction was carried out in an ultrasonic device at various temperatures (30, 40, 50, and 60°C) and times (8, 16, 24, and 32 min). The experimental results showed that ultrasound positively contributed to acid hydrolysis process. The number-average molecular weight of the treated k-carrageenan was lower or the percentage of reduction was higher at lower pH, longer reaction time, and higher temperature. The lowest number-average molecular weight (14 kDa) or the highest percent of molecular weight reduction reduction (97.7%) was achieved after ultrasonic irradiation at 60°C and pH 3 for 32 min. Keywords: depolymerization; midpoint scission; ultrasonication

Ultrasound-assisted acid hydrolysis of palm leaves (Roystonea oleracea) for production of fermentable sugars

2013 ◽  
Vol 45 ◽  
pp. 128-132 ◽  
Author(s):  
Leandro B. Werle ◽  
Jardel C. Garcia ◽  
Raquel C. Kuhn ◽  
Marcio Schwaab ◽  
Edson L. Foletto ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Fermentable Sugars ◽  
Ultrasound Assisted ◽  
Hydrolysis Of

Ultrasound-assisted dilute acid hydrolysis of tea processing waste for production of fermentable sugar

2016 ◽  
Vol 32 (2) ◽  
pp. 393-403 ◽  
Author(s):  
Mustafa Germec ◽  
Kübra Tarhan ◽  
Ercan Yatmaz ◽  
Nedim Tetik ◽  
Mustafa Karhan ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Fermentable Sugar ◽  
Dilute Acid ◽  
Processing Waste ◽  
Dilute Acid Hydrolysis ◽  
Ultrasound Assisted ◽  
Hydrolysis Of

scholarly journals Ultrasound-assisted acid hydrolysis of cassava (Manihot esculenta) bagasse: Kinetics, acoustic field and structural effects

2021 ◽  
Vol 70 ◽  
pp. 105318
Author(s):  
Tiago Carregari Polachini ◽  
Isabel Hernando ◽  
Antonio Mulet ◽  
Javier Telis-Romero ◽  
Juan A. Cárcel
Keyword(s):  
Acid Hydrolysis ◽  
Acoustic Field ◽  
Manihot Esculenta ◽  
Structural Effects ◽  
Ultrasound Assisted ◽  
Hydrolysis Of

scholarly journals Microwave-assisted Weak Acid Hydrolysis of Proteins

2012 ◽  
Vol 3 (2) ◽  
pp. 47-49 ◽  
Author(s):  
Mi-Yeong Seo ◽  
Jin-Hee Kim ◽  
Se-Hwan Park ◽  
Ji-Hye Lee ◽  
Tae-Hee Kim ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Weak Acid ◽  
Microwave Assisted ◽  
Hydrolysis Of

scholarly journals Weak Acid Hydrolysis of Proteins

2013 ◽  
Vol 34 (1) ◽  
pp. 27-28 ◽  
Author(s):  
Miyeong Seo ◽  
Jinhee Kim ◽  
Sehwan Park ◽  
Ji-Hye Lee ◽  
Taehee Kim ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Weak Acid ◽  
Hydrolysis Of
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