Abstract
Purple sweet potato anthocyanins are kinds of natural anthocyanin red pigments extracted from the root or stem of purple sweet potato. They are stable and have the functions of anti-oxidation, anti-mutation, anti-tumor, liver protection, hypoglycemia, and anti-inflammation, which confer them a good application prospect. Nevertheless, there is not a comprehensive review of purple sweet potato anthocyanins so far. The extraction, structural characterization, stability, functional activity, application in the food, cosmetics, medicine, and other industries of anthocyanins from purple sweet potato, together with their biotransformation in vitro or by gut microorganism are reviewed in this paper, which provides a reference for further development and utilization of anthocyanins.
Highlights
The Extraction Methods of Purple sweet potato anthocyanins (PSPAs)Extraction is a separation technology, which has a certain impact on the extraction rate, quality, and composition of target compounds [16,17]
Purple sweet potato anthocyanins are kinds of natural anthocyanin red pigments extracted from the root or stem of purple sweet potato
The results revealed that the yield of Purple sweet potato anthocyanins (PSPAs) was the highest (158 mg/100 g dw) when the temperature was 80 ◦ C, the extraction time was 60 min, and the solid–liquid ratio was 1:32
Summary
Extraction is a separation technology, which has a certain impact on the extraction rate, quality, and composition of target compounds [16,17]. An effective extraction method can maximize the use of target compounds on the basis of utilizing environmental protection technology [18]. With the development of science and technology, some effective processing technologies have been widely used in the extraction of plant active components, such as enzymatic method, ultrasonic method, and pulsed electric field method. These technologies can efficiently destroy cell walls and cell membranes, increase the permeability of tissue cells, shorten the extraction time, enhance the yield of pigments, and improve the quality of products [19]. The selection of extraction methods of PSPAs is of great significance for its functional activity and production application
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