Oxidation of hydrolyzed olive pits and almond shells with nitric acid in the production of humic-based fertilizers

Riera, Francisco A.; Álvarez, Roberto; Coca, José

doi:10.1021/ie00049a042

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…2004) has been studied to produce food ingredients and antioxidants, respectively. Their utilization as humic‐based fertilizers (Riera et al. 1991) and as substrates for the preservation and growing of ligno‐cellulolytic fungi (Vargas‐García et al.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant Activity of Fractions From Acid Hydrolysates of Almond Shells

Moure

Domı́nguez

Parajó

2008

J Food Process Engineering

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Acid hydrolysis of almond shells was carried out with 2.5 and 5% sulfuric acid, and the ethyl acetate soluble fraction of hydrolysates (EASH) was fractionated on a Sephadex Uppsala, Sweden) column. Three fractions were recovered from the crude extract produced by hydrolysis with 2.5% sulfuric acid (EASH-2.5), and five from the one produced with 5% sulfuric acid . The recovered fractions were assayed for phenolic content, radical-scavenging activity (measured by the a,a-diphenylb-picrylhydrazyl and Trolox equivalent antioxidant capacity [TEAC] methods) and reducing capacity (measured by the ferric-reducing antioxidant power [FRAP] and the reducing power methods). The highest contents of phenolics corresponded to the third fraction (F3) from EASH-2.5 and to the fourth fraction (FЈ4) from EASH-5, whereas fraction 1 (F1) from EASH-2.5 and fraction 4 from EASH-5 showed the highest TEAC and FRAP values, and reducing power. PRACTICAL APPLICATIONSAcid-catalyzed hydrolysis for producing xylose is the most common technology for processing almond shells into chemicals, and allows fractionation of this residue into a solid fraction (cellulose and lignin) and a liquid stream containing monomeric sugars, sugar degradation products, extractives and lignin depolymerization compounds. To destine the monomeric sugars as a carbon source for bioconversion purposes, a detoxification step is required. Solvent extraction with ethyl acetate yields a by-product fraction consisting of compounds with phenolic nature and antioxidant activity, and its utilization 1 Corresponding

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Section: Introductionmentioning

confidence: 99%

Antioxidant Activity of Fractions From Acid Hydrolysates of Almond Shells

Moure

Domı́nguez

Parajó

2008

J Food Process Engineering

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“…As a fertiliser, the shells undergo a specific acidification treatment and need to be ground. Their composition in terms of minerals and micronutrients is helpful for soil composition [49].…”

Section: Almondmentioning

confidence: 99%

Recent Innovations on the Reuse of Almond and Hazelnut By-Products: A Review

Ollani,

Peano,

Sottile

2024

Sustainability

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Nuts consumption has increased significantly in the last 10 years, especially driven by the stimulated awareness of their possible beneficial health effects. Increased nuts consumption is linked to an obvious accumulation of by-products and waste. With the view of the circular economy, the aim of this review is to analyse the recent and innovative approaches able to valorise the by-products derived from almonds and hazelnuts, two important nut products of the Italian scene, with historical and traditional importance. The most important solutions are concerned with reuse of almond hull, shell, skin, oil cake, and hazelnut shell; skin and oil cake are often considered waste or by-products. Many interesting implications in the feed and food sectors have been detected in the last ten years, aimed at designing innovative materials developed from by-products and extraction of bioactive molecules for different purposes. The perspective chosen to discuss the topic is related to the sustainability of these processes, in terms of both the environment and economy. The circular economy supports a zero-waste approach, which should not also be meant as a zero-cost process in terms of the level of technology that has been partially developed.

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Postharvest Technology and Utilization of Almonds

Schirra

1997

Horticultural Reviews

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Oxidation of hydrolyzed olive pits and almond shells with nitric acid in the production of humic-based fertilizers

Cited by 5 publications

References 4 publications

Antioxidant Activity of Fractions From Acid Hydrolysates of Almond Shells

Antioxidant Activity of Fractions From Acid Hydrolysates of Almond Shells

Recent Innovations on the Reuse of Almond and Hazelnut By-Products: A Review

Postharvest Technology and Utilization of Almonds

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