Abstract
Total polyphenols content (TPC), including flavonoids (rutin, mangiferin and kaempferol) and phenolic acids (gallic, caffeic and ellagic acid) from Physalis angulata were recovered by Ultrasound-Assisted Extraction and quantified by UV–vis and HPLC analysis. Process parameters were assessed through a Central Composite Rotatable Design (CCRD) and a model with regression coefficient equal to 0.9640, was used to establish the optimum conditions together with its respective response surfaces. The increase of ethanol percentage and solid-liquid ratio promoted a decrease on TPC but, on the other hand, the increase in the temperature led to an increase in the extraction of these compounds. Experimental results indicated a maximum amount of total polyphenols of 1.039 mg Gallic Acid Eqivalent (GAE) g-1 of extract, 104.88, 4.04, 8.37, 58.28, 13.26 and 1.87mg.L-1 for gallic acid, caffeic acid, ellagic acid, rutin, mangiferin and kaempferol, respectively.
Highlights
Natural phenols has been reported excellent properties as food preservatives, in the production of paints, paper and cosmetic (Ignat, Volf, & Popa, 2011) as well as to have an important role in the protection against pathological disturbances, such as atherosclerosis, brain dysfunction and cancer (Nair, Panneerselvam, Gopi, & Hong-bo, 2013).Polyphenols are divided into several classes according to the number of phenol rings
We studied the effects of process parameters on the recovery of total polyphenols and specific compounds from Physalis angulata obtained by ultrasound-assisted extraction
The concentration of phenolic acids and flavonoids in the extracts were evaluated by HPLC-DAD according to analytical conditions reported by Nayak et al, (2015) and Carniel et al, (2016)
Summary
Natural phenols has been reported excellent properties as food preservatives (colorants, antioxidant, antimicrobial), in the production of paints, paper and cosmetic (Ignat, Volf, & Popa, 2011) as well as to have an important role in the protection against pathological disturbances, such as atherosclerosis, brain dysfunction and cancer (Nair, Panneerselvam, Gopi, & Hong-bo, 2013). There are many researches involving the use of ultrasound in the extraction of polyphenols (Silva, Garcia, & Franciscato, 2016; Guerra, Garcia, & Silva, 2016; Lazar, Talmaciu, Volf, & Popa, 2016; Jovanović et al, 2017) it is desirable more discussion about variables involved in the extraction process (as solid-liquid ratio, pressure, temperature, solvent concentration, ultrasound power) to contribute with the results at separation process field Within this framework, we studied the effects of process parameters on the recovery of total polyphenols and specific compounds (flavonoids and phenolic acids) from Physalis angulata obtained by ultrasound-assisted extraction
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