Blanching effect on physicochemical and functional properties of flours processed from peeled and unpeeled white‐fleshed sweet potato Algerian cultivar

Belkacemi, Louiza

doi:10.1590/fst.86821

Cited by 3 publications

(1 citation statement)

References 62 publications

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“…Tannin, as a natural polyphenol compound mainly found in plant wood, bark, seeds, fruits, leaves, especially in some foods (Belkacemi, 2022;Santos et al, 2022), falls into two camps based on chemical structure: condensed tannins, and hydrolyzable tannins. The former refers to the condensation products of hydroxyflavanes, which are interconnected by C-C bonds and are not easy to decompose in water, while the latter is an ester whose ester bond is easy to hydrolyze under the action of alkali, enzyme or acid.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-assisted extraction of a condensed tannin and its application for removal dyes from water

et al. 2023

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The woody oil industry generates a large amount of seed shell waste during its production. Therefore, this paper employs a central composite design (CCD) methodology to optimize the ultrasonic-assisted extraction process, thus utilizing the byproduct. The infrared spectrum and thermogravimetric analysis is adopted to explore the chemical structure and thermal stability of tannin. Besides, the tannin resin (TF) is prepared to elaborate its adsorbing performance for dyes in water. The results verify the role of ultrasonic-assisted extraction method in increasing yield rate. The optimal conditions are as follows: 60% ethanol as extraction solvent, the solid-liquid ratio of 1:25 (g/mL), ultrasonic power of 160 W, and extracted at 80 o C for 60min. The yield rate of tannin under such conditions stands at 32.04% (w/w). Temperature is vital for the extraction rate. Acer truncatum tannin as a condensed tannin, performs favorable thermal stability, and TF effectively absorbs cationic dye in water. The maximum adsorption capacity of methylene blue peaks at 176.13 mg/g. Acer truncatum shell serves as a resource of condensed tannin, and Acer truncatum tannin resin can be potentially developed into a new biomass adsorbent.

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Section: Introductionmentioning

confidence: 99%

Ultrasound-assisted extraction of a condensed tannin and its application for removal dyes from water

et al. 2023

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Fungal composition, quantification of mycotoxins, and enzyme activity in processed Solanum tuberosum Linn (potato) products stored at different relative humidity

Danladi,

Ogbonna,

Ogbonna

et al. 2023

Journal of Applied Microbiology

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Aim Postharvest loss of potatoes at the peak of harvest is of global concern. This study aimed to determine the quality of stored processed potato products based on fungal composition, mycotoxin contamination and fungal enzyme activity. Materials and Methods Potato products from three cultivars (Caruso, Marabel and Nicola) were grouped as peeled or unpeeled, oven- or sun-dried and all samples were in flour form. Samples were incubated separately for six weeks at 25%, 74% and 87% relative humidities (RH) at 25 °C. The pH, moisture content, visible deterioration, mycotoxin, fungal identity by DNA sequencing, and enzyme activity were determined. Results Results of grouped products (based on variety, drying and peeling method) revealed that moisture content increased in the oven-dried samples and the pH value reduced after incubation. About 26% of the products at 87% RH showed visible deterioration, low amounts of fumonisin were detected in fermented potato product and nine fungal genera were identified across the three RH levels. Enzyme activities by Aspergillus niger, Fusarium circinatum and Rhizopus stolonifer isolates were confirmed. Conclusion RH influenced deterioration and fungal activities in some stored processed potato products. Low levels of fumonisin were detected.

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Some quality properties of yellow-fleshed sweet potato flour as affected by different drying methods

Badiora,

Morakinyo,

Taiwo

2023

Food Prod Process and Nutr

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This study compared some quality properties of yellow-fleshed sweet potato flour samples as affected by pretreatments (0.02% sulfite; blanching 85 °C for 3 min 30 s and steam blanching 100 °C for 2 min) and drying methods (oven, sun, and drum drying). The physicochemical composition, functional properties, pasting profile, and least gelation concentration of the flours were determined. Before pretreatment, the sweet potato tubers were sorted, weighed, rinsed, peeled, and diced. The smallest particle size (58 μm) was recorded for samples blanched at 85 °C followed by oven drying while drum-dried samples had the largest particle size (119.5 μm). The pH values (5.58 - 5.90) of the pretreated sun- and oven-dried samples were significantly (p<0.05) impacted by 0.02% sulfite. Compared to other drying methods. drum-dried samples had low bulk density (0.36 g/ml), the highest water (531%) and oil absorption capacities (168.5%,) and the least dispersibility (35%). Drum-dried samples had the highest swelling capacities at 60 – 80 °C but the values decreased at 80 – 90 °C compared to samples from other drying methods that had low swelling capacity at 60 - 70 °C but the values increased as the temperature increased from 70 – 90 °C. Results of the sample pasting profiles showed that pretreatment and drying techniques were significant on the various viscosities measured. Drum-dried samples had the lowest trough viscosity (18.13 RVU), final viscosity (24.88 RVU), setback viscosity (6.75 RVU), peak time (1.07 min), and pasting temperature (0 °C). This study concluded that the pretreatment and drying methods affected the quality properties of the yellow-fleshed sweet potato flour samples differently, consequently altering their functionality. Graphical Abstract

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Blanching effect on physicochemical and functional properties of flours processed from peeled and unpeeled white‐fleshed sweet potato Algerian cultivar

Cited by 3 publications

References 62 publications

Ultrasound-assisted extraction of a condensed tannin and its application for removal dyes from water

Ultrasound-assisted extraction of a condensed tannin and its application for removal dyes from water

Fungal composition, quantification of mycotoxins, and enzyme activity in processed Solanum tuberosum Linn (potato) products stored at different relative humidity

Some quality properties of yellow-fleshed sweet potato flour as affected by different drying methods

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