Abstract
A natural low-methoxyl pectin (LAHP), was extracted with oxalic acid solution from dried heads of sunflower (Helianthus annuus L.). The single-factor experiments and response surface methodology (RSM) were used to optimize LAHP extraction conditions. The extraction yield of LAHP was 18.83 ± 0.21%, and the uronic acid content was 85.43 ± 2.9% obtained under the optimized conditions (temperature of 96 °C, time of 1.64 h, oxalic acid concentration of 0.21%). Experimentally obtained values were in agreement with those predicted by RSM model, indicating suitability of the employed model and the success of RSM in optimizing the extraction conditions. LAHP has been characterized by ash content, degree of esterification (DE), galacturonic acid (GalA) content, molecular weight and intrinsic viscosity meanwhile commercial low-methoxyl pectin (CLMP) as comparison. This study finds out a potential source of natural LMP which expands the application scope of sunflower heads. It is an efficient reuse of waste resources and provides a novel thought to explore the natural resources for food and pharmaceutical applications.
Highlights
A natural low-methoxyl pectin (LAHP), was extracted with oxalic acid solution from dried heads of sunflower (Helianthus annuus L.)
Extraction temperature was set at 40 °C, 55 °C, 70 °C, 85 °C and 100 °C to investigate its effect on extraction yield and uronic acid content of lyophilized to obtain sunflower heads pectin (LAHP) while extraction time was fixed at 1.5 h and oxalic acid concentration was fixed at 0.2%
The uronic acid content increased when extraction temperature increased from 40 °C to 85 °C, while decreased when temperature increased from 85 °C to 100 °C
Summary
A natural low-methoxyl pectin (LAHP), was extracted with oxalic acid solution from dried heads of sunflower (Helianthus annuus L.). LMP could be widely used in low calorie foods or sugar-free food, healthy care medicines and cosmetics industries[17] In this case, HMP is usually served to manufacture LMP by chemical or enzymatic treatment to hydrolysis of the methyl esters from galacturonic acid C-6 carboxyl groups. Single-factor experiments and response surface methodology (RSM) based on a Box-Behnken design (BBD), two most commonly experimental design methods were used to optimize the extraction conditions of pectin, which named as LAHP from sunflower heads. The objective of this study was to find out an abundant source of natural LMP and expands the application scope of sunflower heads It is an efficient reuse of waste resources and furnishes a novel thought to explore the natural resources
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