Recovering Valuable Bioactive Compounds from Potato Peels with Sequential Hydrothermal Extraction

Identification and Recovery of Valuable Bioactive Compounds from Potato Peels: A Comprehensive Review

“…The determination of the total phenolic compounds in potato peel extracts is commonly conducted by the Folin-Ciocalteu method. However, for the identification and quantification of individual phenolic compounds present in potato peel extracts, techniques such as High-Performance Liquid Chromatography (HPLC) [17,19,32], using different detectors, such as the DAD (Diode Array Detector) [23,31,34] and the ESI-MS (Electrospray Ionization and Mass Spectrometer) [28] are widely applied due to their high efficiency. For instance, Riciputi et al [28] carried out the identification and quantification of phenolic compounds in ethanolic extracts obtained by the ultrasonic treatment of five potato by-products using HPLC-DAD-ESI-MS.…”

“…They are constituted by different monosaccharides linked by α or β glycosidic bonds [54] and are considered a natural source of bioactive compounds [55]. Thanks to their diverse structures and functional properties, polysaccharides can have commercial applications, such as texture improvement, water retention, and emulsion stabilization [17]. In particular, starch and non-starch polysaccharides (pectin, cellulose, and hemicelluloses) were found in potato skins [13] in percentages of 46% and 26.6% of the dry matter, respectively [56].…”

“…The polysaccharides extracted from the skin of potatoes, like other plant polysaccharides, have a high antioxidant activity as they capture free radicals in the diet to prevent oxidative damage [57]. These compounds can also present biological activities, such as those which are antitumor, antiviral, immunostimulant, anti-inflammatory, and anticoagulant [17,63]. In this context, it should be noted that the good radical scavenging activity exhibited by potato peel polysaccharides might be due to a possible fraction of the esterified phenolic compounds that may have precipitated with them [17].…”

“…Potato peel was recently considered a new and important source of dietary fibre as this fraction represents between 40 and 45% of its dry weight (dw) [16]. Concerning its chemical composition, in addition to the high percentage of moisture reported [17], the important contents that should be noted are carbohydrates (63%, where starch accounts for 34%), protein (17%), lignin (10%), ash (9%), and lipids (1%) [13]. Interestingly, this by-product has also been reported as being a source of phenolic compounds that is even higher in the peel than it is in the flesh [18].…”

Emerging Processing Technologies for the Recovery of Valuable Bioactive Compounds from Potato Peels

“…This decreases the residual solid content and thus contributes to mitigating environmental and handling problems. In a recent study by Martinez-Fernandez et al, a SeqHTE process was shown to recover 22.48 and 32.87 mg/g dry peel of polyphenols, and 20-450 and 35-610 mg/kg dry peel of alkaloids from Russet Burbank and peel mixture samples, respectively [53].…”