Natural colorants: Pigment stability and extraction yield enhancement via utilization of appropriate pretreatment and extraction methods

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Author list: Ngamwonglumlert L., Devahastin S., Chiewchan N.

Publisher: Taylor and Francis Group

Publication year: 2017

Journal: Critical Reviews in Food Science and Nutrition (1040-8398)

Volume number: 57

Issue number: 15

Start page: 3243

End page: 3259

Number of pages: 17

ISSN: 1040-8398

eISSN: 1549-7852

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019552149&doi=10.1080%2f10408398.2015.1109498&partnerID=40&md5=708a1c68705a20e6b035b52fdc4c9ea6

Languages: English-Great Britain (EN-GB)

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Abstract

Natural colorants from plant-based materials have gained increasing popularity due to health consciousness of consumers. Among the many steps involved in the production of natural colorants, pigment extraction is one of the most important. Soxhlet extraction, maceration, and hydrodistillation are conventional methods that have been widely used in industry and laboratory for such a purpose. Recently, various non-conventional methods, such as supercritical fluid extraction, pressurized liquid extraction, microwave-assisted extraction, ultrasound-assisted extraction, pulsed-electric field extraction, and enzyme-assisted extraction have emerged as alternatives to conventional methods due to the advantages of the former in terms of smaller solvent consumption, shorter extraction time, and more environment-friendliness. Prior to the extraction step, pretreatment of plant materials to enhance the stability of natural pigments is another important step that must be carefully taken care of. In this paper, a comprehensive review of appropriate pretreatment and extraction methods for chlorophylls, carotenoids, betalains, and anthocyanins, which are major classes of plant pigments, is provided by using pigment stability and extraction yield as assessment criteria. ฉ 2017 Taylor & Francis Group, LLC.

Keywords

betalains, Chlorophylls, non-conventional extraction