Abstract
Fruit by-products are being investigated as non-conventional alternative sources of dietary fiber (DF). High hydrostatic pressure (HHP) treatments have been used to modify DF content as well as its technological and physiological functionality. Orange, mango and prickly pear peels untreated (OU, MU and PPU) and HHP-treated at 600 MPa (OP/55 °C and 20 min, MP/22 °C and 10 min, PPP/55 °C and 10 min) were evaluated. Untreated and treated fruit peels were subjected to fecal in vitro fermentations. The neutral sugar composition and linkage glycosidic positions were related to the production of short chain fatty acids (SCFA) resulting from the fermentation of the materials. After HHP-treatments, changes from multibranched sugars to linear sugars were observed. After 24 h of fermentation, OP yielded the highest amount of SCFA followed by PPU and MP (389.4, 282.0 and 204.6 μmol/10 mg DF, respectively). HHP treatment increased the SCFA concentration of orange and mango peel by 7 and 10.3% respectively, compared with the untreated samples after 24 h of fermentation. The results presented herein suggest that fruit peels could be used as good fermentable fiber sources, because they yielded high amounts of SCFA during in vitro fermentations.
Highlights
The role of dietary fiber (DF) in human health is highly recognized and associated with satiety and attenuation of constipation, diminishment of both glucose and lipid levels, reduced risk of coronary heart disease and cancer and enhancement of the growth of beneficial of hind gut microbiota [1,2]
The soluble dietary fiber (SDF) and insoluble dietary fiber (IDF) contents of samples expressed as % dry weight were 7.2 and 46.3 (OU), 14.0 and 38.5 (OP); 22.1 and 33.4 (MU), 20.7 and 29.5 (MP); and 6.7 and 30.9 (PPU) and 6.8 and 37.2 (PPP), respectively
The high amounts of arabinose and galactose could be related to neutral arabinogalactan polysaccharides or pectic polysaccharides linked to galacturonic acid residues, whereas the high glucose content in these DF fruit peels might be related to the presence of cellulosic cell wall polysaccharides and β-glucans [17]
Summary
The role of dietary fiber (DF) in human health is highly recognized and associated with satiety and attenuation of constipation, diminishment of both glucose and lipid levels, reduced risk of coronary heart disease and cancer and enhancement of the growth of beneficial of hind gut microbiota [1,2]. The importance of DF and colonic bacteria relies on the fermentation processes and products occurring in the gut, mainly the production of short chain fatty acids (SCFA) such as propionate, acetate and butyrate. Molecules 2019, 24, 697 the absorption of minerals, reduce the production of bile acids and inhibit the growth of pathogenic bacteria [4,5,6]. Acetate is the chief SCFA in the colon—it gets into the peripheral circulation and, once absorbed, increases cholesterol synthesis. Butyrate promotes cell differentiation and proliferation as well as apoptosis of colonocytes by transforming the primary to secondary bile acids by colonic acidification [6]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
