Improvement of microwave-assisted hydrolysis of cassava pulp and tapioca flour by addition of activated carbon

Cassava pulp and tapioca flour are potential sources of glucose. In this work, validity of microwave irradiation for hydrolysis of carbohydrates, especially starch, present in cassava pulp and tapioca flour was estimated as a non-enzymatic saccharification technique. Suspension of cassava pulp or tapioca flour in distilled water (1g/20 mL) was subjected to microwave irradiation at temperatures of 140-240 °C with pre-heating time of 4 min and heating time of 5 min. Solubilization rate of cassava pulp increased with increasing temperature of microwave heating treatment and reached maximum (92.54%) at 220 °C, while that of tapioca flour reached almost 100% at 140 °C. Production of malto-oligomers from starch in cassava pulp and tapioca flour was clearly observed at 220 °C. The highest glucose yields from cassava pulp and tapioca flour in this experiment were 28.59 and 58.76% dry matter, respectively. Variation of pre-heating time at 230 °C did not give significant effects on glucose yield from cassava pulp. However, glucose yield from tapioca flour decreased due to increase of pre-heating time. Microwave irradiation is a promising method of hydrolysis for cassava pulp and tapioca flour due to the fast process.

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Microwave-assisted enzymatic hydrolysis of starch

10.3390/ecsoc-13-00159 ◽

2009 ◽

Cited By ~ 1

Author(s):

Marcin Lukasiewicz ◽

Anna Osowiec ◽

Magdalena Marciniak

Keyword(s):

Enzymatic Hydrolysis ◽

Microwave Assisted ◽

Hydrolysis Of

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Pretreatment of Switchgrass for Production of Glucose via Sulfonic Acid-Impregnated Activated Carbon

Processes ◽

10.3390/pr9030504 ◽

2021 ◽

Vol 9 (3) ◽

pp. 504

Author(s):

Yane Ansanay ◽

Praveen Kolar ◽

Ratna Sharma-Shivappa ◽

Jay Cheng ◽

Consuelo Arellano

Keyword(s):

Activated Carbon ◽

Sulfonic Acid ◽

Solid Acid ◽

Methanesulfonic Acid ◽

Biofuel Production ◽

Acid Catalysts ◽

Effects Of Temperature ◽

Carbon Catalysts ◽

Hydrolysis Of

In the present research, activated carbon-supported sulfonic acid catalysts were synthesized and tested as pretreatment agents for the conversion of switchgrass into glucose. The catalysts were synthesized by reacting sulfuric acid, methanesulfonic acid, and p-toluenesulfonic acid with activated carbon. The characterization of catalysts suggested an increase in surface acidities, while surface area and pore volumes decreased because of sulfonation. Batch experiments were performed in 125 mL serum bottles to investigate the effects of temperature (30, 60, and 90 °C), reaction time (90 and 120 min) on the yields of glucose. Enzymatic hydrolysis of pretreated switchgrass using Ctec2 yielded up to 57.13% glucose. Durability tests indicated that sulfonic solid-impregnated carbon catalysts were able to maintain activity even after three cycles. From the results obtained, the solid acid catalysts appear to serve as effective pretreatment agents and can potentially reduce the use of conventional liquid acids and bases in biomass-into-biofuel production.

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