Optimization of Alkali Treatment for Production of Fermentable Sugars and Phenolic Compounds from Potato Peel Waste Using Topographical Characterization and FTIR Spectroscopy

Abstract

Potato peel waste (PPW) was utilized as a bio-template for the production of valuable compounds such as reducing sugars (RS), total sugar (TS) and total phenolic compounds (TPC). Two methods of alkali treatments, i.e., chemical (NaOH) and thermochemical (NaOH assisted with autoclaving) processes, were employed for the deconstruction of PPW. Response surface methodology (RSM) was used to study the effects of alkali concentration (0.6–1.0 w/v), substrate concentration (5–15 g) and time (4–8 h) on the extraction of RS, TS and TP from PPW. The application of alkali plus steam treatment in Box-Behnken design (BBD) with three levels yielded the optimum releases of RS, TS and TP as 7.163, 28.971 and 4.064 mg/mL, respectively, corresponding to 10% substrate loading, in 0.6% NaOH for 8 h. However, the alkali treatment reported optimum extractions of RS, TS and TP as 4.061, 17.432 and 2.993 mg/mL, respectively. The thermochemical pretreatment was proven a beneficial process as it led to higher productions of TP. FTIR and SEM were used to analyze the deterioration levels of the substrate. The present work was used to explore the sustainable management of PPW, which is a highly neglected substrate bioresource but is excessively dumped in open environment, raising environmental concerns. The cost-effective methods for the breakdown of PPW starch into fermentable sugars might be utilized to extract valuable compounds.

Investigation and characterization of changes in potato peels by thermochemical acidic pre-treatment for extraction of various compounds

“…up to 660.62 mg/gds were released after dilute sulphuric acid plus autoclaved treatment. Mushtaq et al 52 have reported high yield of total and reducing sugars upto 28.971and 7.163 mg/ml using alkali treated PPW. A previous report has described dilute sulphuric acid hydrolysis and sonication of PPW as a very promising process to release reducing sugars i.e., 57.03 g/kg 53 .…”

Amylase and Cellulase Production from Newly Isolated Bacillus subtilis Using Acid Treated Potato Peel Waste

“…The key areas of industry where amylases and cellulases are increasingly being applied are in textile, healthcare, pulp, paper, detergent, food, beverages, pharmaceutical, biofuel, and pretreatment methods [ 17 , 18 , 19 , 20 , 21 , 22 ]. Various research reports have investigated the potential of PPW enzyme production and various other value-added products [ 7 , 23 , 24 , 25 , 26 ].…”