Coffee silverskin and starch-rich potato washing slurries as raw materials for elastic, antioxidant, and UV-protective biobased films

Oliveira, Gonçalo; Gonçalves, Idalina; Barra, Ana; Nunes, Cláudia; Ferreira, Paula; Coimbra, Manuel A.

doi:10.1016/j.foodres.2020.109733

Cited by 26 publications

(27 citation statements)

References 43 publications

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“…The water vapor transmission rate (WVTR) of each film (samples with 28 mm diameter) was assessed using test dishes and a chamber kept at 23 ± 2 • C with 53% relative humidity and an air velocity of ca. 160 m/min, as already described [7]. WVTR was calculated following Equation (3):…”

Section: Water Vapor Transmission Ratementioning

confidence: 99%

“…This phenomenon supports the starch transesterification with SFO-derived fatty acids, decreasing the hydrogen bonding among the starch hydroxyl groups and the surrounding water molecules. As all starch-based films contained glycerol as plasticizing agent, the high-water solubility of this very hydrophilic molecule can explain the verified films' weight loss after immersion into water [7]. When in contact with aqueous environments, the neat films (0%) lost ca.…”

Section: Solubility and Water Vapor Barrier Properties Of Potato Starch/15% Sfo/koh-based Filmsmentioning

confidence: 99%

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Hydrophobic Starch-Based Films Using Potato Washing Slurries and Spent Frying Oil

Petronilho

Oliveira

Domingues

et al. 2021

Foods

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Starch is a promising candidate for preparing biodegradable films with useful gas barriers and thermoplastic capabilities. However, these materials are hydrophilic and brittle, thus limiting their application range. To overcome these drawbacks, it has been hypothesized that starch can be hydrophobized and plasticized during the starch-based film production using a single-step approach and following transesterification principles. In this work, KOH powder and spent frying oil (SFO) were used as an alkaline catalyst and a source for triacylglycerides, respectively, to promote the modification of starch. Different ratios of SFO (w/w related to the dried starch weight) were tested. When compared to the neat films (without a catalyst and SFO), the incorporation of at least 15% SFO/KOH gave rise to transparent, hydrophobic (water contact angles of ca. 90∘), stretchable (ca. 20×), elastic (ca. 5×), and water tolerant starch-based films, contrary to the films produced without the catalyst. ATR-FTIR and 1H NMR revealed structural differences among the produced films, suggesting that starch was modified with the SFO-derived fatty acids. Therefore, adding KOH during the potato starch/spent frying oil-based film’s production was determined to be a promising in situ strategy to develop starch-based materials with improved hydrophobicity and flexibility, while valorizing the potato chip industry’s byproducts.

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Section: Water Vapor Transmission Ratementioning

confidence: 99%

Section: Solubility and Water Vapor Barrier Properties Of Potato Starch/15% Sfo/koh-based Filmsmentioning

confidence: 99%

Hydrophobic Starch-Based Films Using Potato Washing Slurries and Spent Frying Oil

Petronilho

Oliveira

Domingues

et al. 2021

Foods

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“…e size of potato starch granules is relatively large (25-100 μm), and exists in typile B-type crystallinity [23]. Also, in the presence of plasticizers and under high temperature and shearing conditions, potato starch would acquire thermoplastic property which was suitable for preparing biodegradable film [24]. However, the performance of potato starch-based films still needs to be improved to extend the application in food package because of their poor water resistance.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Biodegradable Composited Films Based on Potato Starch/Glycerol/Gelatin

Niu

et al. 2021

Journal of Food Quality

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The use of plastics is resisted worldwide. Therefore, finding alternatives to plastic packaging products is an urgent issue. This work was dedicated to the preparation of biodegradable composited films with potato starch, glycerol, and gelatin. The formulation of the biodegradable film was first optimized via response surface methodology combined with the multi-index comprehensive evaluation method that considered physical properties (thickness, water solution (WS), tensile strength (TS) and elongation at break (E%)) and barrier property (light transmittance (T%)). Results indicated that the optimal conditions were 2.5% starch, 2.0% glycerol, and 1.5% gelatin (based on water). The optimized film presented excellent properties with TS of 4.47 MPa, E% of 109.91%, WS of 43.64%, and T% of 41.21% at 500 nm, and the comprehensive evaluation score of the composite film was 28.68. Moreover, a model verification experiment was further conducted, which proved that the predicted value highly matched experimental values, indicting the credibility and accuracy of the model. The resulting films were further characterized on the basis of rheological measurements, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The rheological measurements proved that the film-forming solution exhibited low shear viscosity and non-Newtonian fluid behavior. FTIR and SEM revealed excellent compatibility among starch, glycerol, and gelatin. Hence, the resulting optimized film may be expected to provide theoretical basis and technical support for the food packing industry.

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“…Therefore, in recent years, many studies have begun to pay attention to the application of the wastes from coffee bean processing, and these studies have been summarized [ 2 , 3 ]. Among them, CS has been proven to be rich in dietary fiber [ 4 ] and antioxidant substances [ 5 , 6 ], and it can be used as an additive for functional foods [ 7 , 8 ] and cosmetics [ 9 ], as well as in adsorbent materials [ 10 , 11 ], showing good product development potential.…”

Section: Introductionmentioning

confidence: 99%

Morphological Changes and Component Characterization of Coffee Silverskin

Wang

Hong

et al. 2021

Molecules

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Nuclear magnetic resonance (NMR) spectroscopy was used for the qualitative and quantitative analysis of aqueous extracts of unroasted and roasted coffee silverskin (CS). Twenty compounds were identified from 1D and 2D NMR spectra, including caffeine, chlorogenic acid (CGA), trigonelline, fructose, glucose, sucrose, etc. For the first time, the presence of trigonelline was detected in CS. Results of the quantitative analysis showed that the total amount of the main components after roasting was reduced by 45.6% compared with values before roasting. Sugars in the water extracts were the main components in CS, and fructose was the most abundant sugar, its relative content accounting for 38.7% and 38.4% in unroasted and roasted CS, respectively. Moreover, 1D NMR combined with 2D NMR technology shows application prospects in the rapid, non-destructive detection of CS. In addition, it was observed by optical microscopy and scanning electron microscopy (SEM) that the morphology of CS changed obviously before and after roasting.

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Coffee silverskin and starch-rich potato washing slurries as raw materials for elastic, antioxidant, and UV-protective biobased films

Cited by 26 publications

References 43 publications

Hydrophobic Starch-Based Films Using Potato Washing Slurries and Spent Frying Oil

Hydrophobic Starch-Based Films Using Potato Washing Slurries and Spent Frying Oil

Preparation and Characterization of Biodegradable Composited Films Based on Potato Starch/Glycerol/Gelatin

Morphological Changes and Component Characterization of Coffee Silverskin

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