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The conversion of pistachio and walnut shell waste into valuable components with subcritical waterČolnik, Maja ...Pistachio and walnut shells accumulate in large quantities as waste during food processing and represent a promising lignocellulosic biomass for the extraction of valuable components. Subcritical ... water technology was used as an environmentally friendly technique to study the extraction of active ingredients and other valuable degradation products from walnut and pistachio waste. Subcritical water extraction (SWE) was carried out under different process conditions (temperature (150–300 ◦C) and short reaction times (15–60 min)) and compared with conventional extraction using different organic solvents (acetone, 50% acetone and ethanol). The extracts obtained from pistachio and walnut shell waste are rich in various bioactive and valuable components. The highest contents of total phenols (127.08 mg GA/g extract at 300 ◦C for 15 min, from walnut shells), total flavonoids (10.18 mg QU/g extract at 200 ◦C for 60 min, from pistachio shells), total carbohydrates (602.14 mg TCH/g extract at 200 ◦C for 60 min, from walnut shells) and antioxidant activity (91% at 300 ◦C, for 60 min, from pistachio shells) were determined when the extracts were obtained via subcritical water. High contents of total phenols (up to 86.17 mg GA/g extract) were also determined in the conventional extracts obtained with ethanol. Using the HPLC method, sugars and their valuable derivatives were determined in the extracts, with glucose, fructose, furfurals (5-hydroxymethylfurfural (5-HMF) and furfural) and levulinic acid being the most abundant in the extracts obtained by subcritical water. The results show that subcritical water technology enables better exploitation of biowaste materials than conventional extraction methods with organic solvents, as it provides a higher yields of bioactive components such as phenolic compounds and thus extracts with high antioxidant activity, while at the same time producing degradation products that are valuable secondary raw materials.Source: Processes [Elektronski vir]. - ISSN 2227-9717 (Vol. 12, iss. 1, [article no.] 195, 2024, 18 str.)Type of material - e-article ; adult, seriousPublish date - 2024Language - englishCOBISS.SI-ID - 181523459
Author
Čolnik, Maja |
Irgolič, Mihael |
Perva, Amra |
Škerget, Mojca
Topics
pistacije |
orehi |
subkritična ekstrakcija vode |
odpadna biomasa |
sladkorji |
pistachio shells |
walnut shells |
subcritical water extraction |
conventional extraction |
waste biomass |
valuable compounds |
sugars |
furfurals
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source: Processes [Elektronski vir]. - ISSN 2227-9717 (Vol. 12, iss. 1, [article no.] 195, 2024, 18 str.)
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Čolnik, Maja | 31616 |
Irgolič, Mihael | 57006 |
Perva, Amra | 21690 |
Škerget, Mojca | 11865 |
Source: Personal bibliographies
and: SICRIS
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