Phenolics extraction from sweet potato peels: Key factors screening through a Placket–Burman design

Anastácio, Ana; Carvalho, Isabel S.

doi:10.1016/j.indcrop.2012.07.011

Cited by 28 publications

(21 citation statements)

References 25 publications

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“…In their research on the extraction of phenolics from sweet potato peels, ANASTACIO & CARVALHO (2013) reported that the solvent: solid ratio and the depth of peel-cut influenced the amount of phenolics produced. Total phenolic compounds range from 1.02-6.21 GAE (gallic acid equivalent)/g d.w., and the antioxidant activity determined by the ferricreducing antioxidant power was between 0.71-8.11 TE (trolox equivalent)/g d.w. STEED & TRUONG (2008) also found that the peels of sweet potato contained almost three times as much total phenolics as the flesh and whole root.…”

Section: Utilization Of Sweet Potato Peels and Culled Suboptimal Rootsmentioning

confidence: 99%

Potential use of byproducts from cultivation and processing of sweet potatoes

2017

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The cultivation and processing of sweet potatoes into a variety of products yields both solid and liquid organic waste. Solid waste includes peelings and trimmings from the sweet potato root and sweet potato leaves and vines. Liquid waste results from various processing methods and creates significant amounts of nutrient rich waste water. Sweet potato waste materials contain carbohydrates, proteins, phenolic compounds, macro and micro nutrients, and pigments that have the potential of being extracted or utilized for various downstream processes and products. This review examines many of the different ways that these waste products can be utilized.

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Section: Utilization Of Sweet Potato Peels and Culled Suboptimal Rootsmentioning

confidence: 99%

Potential use of byproducts from cultivation and processing of sweet potatoes

2017

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“…Roots were washed under tap water and air-dried (18 ± 5°C) during the night. Peeling was done manually with a cut depth of circa 1.5 mm, and peels were then dried at 60°C for 48 h. The drying conditions were the same used in a previous study on phenolics extraction key factors screening from sweet potato peels (Anastácio and Carvalho 2013). The dried material was then milled and sieved until all particles were smaller than 600 lm (30 mesh).…”

Section: Plant Materialsmentioning

confidence: 99%

“…Agro by-products represent an important source of phytochemicals such as phenolic compounds, possessing a wide range of functional activities (Peschel et al 2006). Peels are accounted as one of the major wastes generated during the processing of sweet potato with currently little commercial value (Maloney et al 2012) and limited work has been performed for their scale up (Anastácio and Carvalho 2013). Sweet potato peels (SPP) contain a high phenolic content with free radical scavenging activities (Zhu et al 2010) which were related to every health benefits (Panda et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Phenolics extraction from sweet potato peels: modelling and optimization by response surface modelling and artificial neural network

2016

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Sweet potato peels (SPP) are a major waste generated during root processing and currently have little commercial value. Phenolics with free radical scavenging activity from SPP may represent a possible added-value product for the food industry. The aqueous extraction of phenolics from SPP was studied using a Central Composite Design with solvent to solid ratio (30-60 mL g), time (30-90 min) and temperature (25-75 °C) as independent variables. The comparison of response surface methodology (RSM) and artificial neural network (ANN) analysis on extraction modelling and optimising was performed. Temperature and solvent to solid ratio, alone and in interaction, presented a positive effect in TPC, ABTS and DPPH assays. Time was only significant for ABTS assay with a negative influence both as main effect and in interaction with other independent variables. RSM and ANN models predicted the same optimal extraction conditions as 60 mL g for solvent to solid ratio, 30 min for time and 75 °C for temperature. The obtained responses in the optimized conditions were as follow: 11.87 ± 0.69 mg GAE g DM for TPC, 12.91 ± 0.42 mg TE g DM for ABTS assay and 46.35 ± 3.08 mg TE g DM for DPPH assay. SPP presented similar optimum extraction conditions and phenolic content than peels of potato, tea fruit and bambangan. Predictive models and the optimized extraction conditions offers an opportunity for food processors to generate products with high potential health benefits.

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“…1, item b), meaning a maximum point. Anastácio and Carvalho [24], in a study to select key factors for extracting phenolics from sweet potato skin, also found that the L/S ratio greatly influences extraction, while the contact time did not have an important effect.…”

Section: Resultsmentioning

confidence: 95%

Optimization of Condensed Tannin Aqueous Extraction from Cashew Tree Pruning Residue Using Response Surface Methodology and Its Drying

Sousa

Brito

2015

Waste Biomass Valor

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Tannins are polyphenolic substances found in plants with biological and technological importance. An experiment using response surface methodology was carried out aiming to optimize tannin extraction from cashew tree bark by studying the influence of some critical variables (time, temperature, and liquid/solid ratio) on the aqueous extraction by dynamic maceration of phenolics and condensed tannins (CT). The effect of reusing bark and solvent in CT extraction was evaluated, as well as the effect of extract drying using spray and freeze-drying. By assessing the relations of independent variables time, temperature, and liquid/solid (L/S) ratio, the condition that yielded the highest tannin content was 100°C for 100 min with a L/S ratio of 30:1. Under these conditions, the CT yielded was 7.63 mg/100 mg bark. Using the same solvent in up to two extractions was viable to extract CT, and spray-drying was the most appropriate drying method for industrial application compared with freeze-drying.

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Phenolics extraction from sweet potato peels: Key factors screening through a Placket–Burman design

Cited by 28 publications

References 25 publications

Potential use of byproducts from cultivation and processing of sweet potatoes

Potential use of byproducts from cultivation and processing of sweet potatoes

Phenolics extraction from sweet potato peels: modelling and optimization by response surface modelling and artificial neural network

Optimization of Condensed Tannin Aqueous Extraction from Cashew Tree Pruning Residue Using Response Surface Methodology and Its Drying

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