Microwave-assisted extraction of cellulose nanocrystals from almond (Prunus amygdalus) shell waste

Valdés, Arantzazu; Mondragón, Gurutz; Garrigós, María Carmen; Eceiza, Arantxa; Jiménez, Alfonso

doi:10.3389/fnut.2022.1071754

Cited by 16 publications

(5 citation statements)

References 68 publications

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“…Alternatively to chemical extraction of cellulose, Valdés et al [63] proposed an innovative extraction method, a microwave-assisted process, of obtaining cellulose nanocrystals. This method can be considered more sustainable and environmentally friendly since reductions in solvents, time, and energy consumption are experienced, together with reduced manipulation from the operator.…”

Section: Almond Shellmentioning

confidence: 99%

“…Figure 3.Almond by-products and innovative applications described in the literature for each fraction. Hull (animal feed[53][54][55], fortified food[56], molecules extraction[57][58][59][60], and materials[61]); shell (molecules extraction[58,62,63] and materials[64][65][66][67]); skin (molecules extraction[17,[68][69][70] and fortified food[71][72][73]); and oil cake (fortified food[74]). …”

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confidence: 99%

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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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Section: Almond Shellmentioning

confidence: 99%

mentioning

confidence: 99%

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

Ollani,

Peano,

Sottile

2024

Sustainability

View full text Add to dashboard Cite

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“…Microwave energy absorption, and consequently heat generation, can be evaluated using dissipation, implying that the presence of polar solvents is essential [23]. The benefits of this method include good repeatability and minimal sample treatment, as well as carrying out the extraction procedure by reducing the solvent volume, exposure time, and energy usage [24][25][26]. Several research groups have been interested in the extraction of pectin from food waste and byproducts using microwave-assisted extraction [27].…”

Section: Introductionmentioning

confidence: 99%

“…Several research groups have been interested in the extraction of pectin from food waste and byproducts using microwave-assisted extraction [27]. This method has been also employed to extract polyphenols from eucalyptus bark [28], peach byproducts [29], and cellulose from almond shell waste [24]. Solid-liquid extraction is a method that is based on transferring the desired compounds from the solid phase to the liquid-extractant phase, usually by employing organic solvents [30].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Feasibility of Cloud-Point Extraction for Bioactive Compound Recovery from Food Byproducts: A Review

Chatzimitakos,

Athanasiadis,

Mantiniotou

et al. 2023

Biomass

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In recent years, the production of food biomass waste has been increasing rapidly. This necessitates urgent measures to be taken so as to utilize them. Since most food biomass waste contains useful bioactive substances, cloud-point extraction (CPE) has emerged as a promising solution to valorize waste. CPE is an extraction method employed for the extraction and preconcentration of various chemical compounds, including polyphenols and flavonoids. As with any other extraction procedure, CPE isolates the target compound(s) from the sample, resulting in increased recovery. One major advantage of CPE is that the extraction is carried out without special equipment or harmful reagents. Moreover, other significant advantages are its effectiveness, simplicity, safety, and rapidity. This review focuses on the extraction of bioactive compounds from food-based waste using CPE and highlights the important parameters that can be tuned to improve the performance of CPE. Furthermore, the potential in promoting environmentally friendly practices within the food industry is also discussed.

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“…Hence, ensuring that the by-product recycling process does not negatively affect soil health by transferring pathogens to fields is critical. Accordingly, there is a high demand for the identification of new and sustainable methods to utilize tree nutshells to reduce mounting stockpiles of accumulated nutshells, which can also alleviate negative impacts on the environment [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Valorizing Tree-Nutshell Particles as Delivery Vehicles for a Natural Herbicide

Kim,

Chan,

Hart-Cooper

et al. 2023

MPs

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The United States is a principal producer of tree nuts (almonds, pistachios, and walnuts), resulting in the generation of excess of tree-nutshell by-products each year, with few market outlets. A nutshell is an essential, lignocellulosic layer that protects a kernel (seed) from the environment during cultivation. The objective of this study was to develop nutshell by-products as herbicide delivery systems, which would not only enable sustainable weed control in fields but also increases nutshell value and reduce the cost of waste disposal. We recently identified a natural salicylaldehyde (SA) that emits volatiles with both herbicidal and antifungal properties. In this study, walnut shell particles saturated with 0.8 to 1.6 M SA were developed as delivery vehicles for SA to soil, which allowed for the controlled release of an SA fumigant for weed control. The pre- and post-emergent herbicidal efficacy of SA was investigated using model monocot (Lolium arundinaceum (Schreb.) Darbysh; turfgrass) and dicot (Brassica rapa var. pekinensis; Chinese cabbage) plants. We compared (1) the effects of different types of solvents for dissolving SA (dimethyl sulfoxide (DMSO) and ethanol (60%, v/v)), and (2) the effect of covering soil with plastic layers (i.e., soil pasteurization) or not covering soil during SA fumigation using nutshells. Results: In the pre-emergent herbicidal testing with the soil covered, the dicot plants exhibited levels of higher susceptibility to SA in DMSO emitted from nutshells when compared to the monocot plants. The seed germination frequencies in the dicots were 15% and 1% with 0.8 and 1.6 M SA, respectively, while those in the monocots were 32% and 18%, respectively, under the same test conditions. In the post-emergent herbicidal testing with the soil covered, the growth of both the monocot and dicot plants was completely prevented after 5 to 7 days of SA fumigation, resulting in the deaths of entire plants. It was noteworthy that in the post-emergent herbicidal testing, SA dissolved in ethanol (60%, v/v) completely disrupted the growth of the monocot and dicot plants as early as 3 days after SA emission from the nutshells, even without the soil being covered. Tree-nutshell particles could serve as effective SA delivery vehicles with controlled release capabilities for SA. The SA exhibited pre- and post-emergent herbicidal activities against the monocot and dicot plants at most growth stages. SA (0.8 and 1.6 M) dissolved in ethanol (60%, v/v) might exert a synergism for higher herbicidal activity after emission from nutshells. Since tree nuts capture/store a substantial amount of carbon over their life-cycles, the new and sustainable utility of using nutshells not only reduces carbon emissions but also valorizes tree-nut by-products, thus benefitting the tree-nut industry.

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Microwave-assisted extraction of cellulose nanocrystals from almond (Prunus amygdalus) shell waste

Cited by 16 publications

References 68 publications

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

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

Exploring the Feasibility of Cloud-Point Extraction for Bioactive Compound Recovery from Food Byproducts: A Review

Valorizing Tree-Nutshell Particles as Delivery Vehicles for a Natural Herbicide

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