The effects of various drying techniques on physicochemical and nutritional qualities of roselle (Hibiscus sabdariffa L.) calyx

Authors

  • Abubakar Abdullahi Lema Department of Plant Science and Biotechnology, Faculty of Bioresources and Food Industry, Universiti Sultan Zainal Abidin (UniSZA), Besut Campus, 22200, Terengganu, Malaysia. https://orcid.org/0000-0001-9505-9723
  • Hasima Mahmod Nor Department of Plant Science and Biotechnology, Faculty of Bioresources and Food Industry, Universiti Sultan Zainal Abidin (UniSZA), Besut Campus, 22200, Terengganu, Malaysia.
  • Monerazzaman Mohamed Kandaker Department of Plant Science and Biotechnology, Faculty of Bioresources and Food Industry, Universiti Sultan Zainal Abidin (UniSZA), Besut Campus, 22200, Terengganu, Malaysia. https://orcid.org/0000-0001-7975-2253
  • Nur Fatihah Hasan Nudin Department of Plant Science and Biotechnology, Faculty of Bioresources and Food Industry, Universiti Sultan Zainal Abidin (UniSZA), Besut Campus, 22200, Terengganu, Malaysia. https://orcid.org/0000-0002-6721-0067
  • Abdulrahman.Mahmud Dogara Biology Department, Faculty of Education, Tishk International University-Erbil, Kurdistan, Iraq https://orcid.org/0000-0003-0944-7282

DOI:

https://doi.org/10.14719/pst.1796

Keywords:

Antioxidants, Phytochemical, Calyx, Drying, Cyanidin glucoside

Abstract

The calyx of the roselle plant (Hibiscus sabdariffa L.) has been extensively studied for its anthocyanins. Roselle calyces are exceedingly perishable, making the process of drying and extracting them without sacrificing quality quite difficult. Similarly, there are several commercial drying procedures available, each with its own set of benefits and drawbacks on nutritional and physicochemical qualities in the final product. The goal of this study was to examine the effects of sun, oven and freeze drying on the physicochemical and nutritional properties of roselle calyx. The antioxidant (%RSA), total anthocyanin content (TAC) and their HPLC identification, physicochemical as well as proximate composition were determined. The results showed that freeze drying increased the drying rate significantly and retained the antioxidant activity (32 mg/100 g QE) then fresh calyx, sun and oven drying, freeze-dried calyx also have higher TAC (176.9 mg/l) than sun and oven dried calyx, the HPLC analysis revealed two anthocyanidin cyanidine glucoside and cyanidin glucoside. phytochemicals and proximate of roselle calyces were higher in freeze-dried than oven and sun drying techniques employed. The findings demonstrated that freeze drying the roselle calyces preserve their quality characteristics.

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Published

13-08-2022 — Updated on 01-10-2022

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How to Cite

1.
Lema AA, Nor HM, Kandaker MM, Nudin NFH, Dogara A. The effects of various drying techniques on physicochemical and nutritional qualities of roselle (Hibiscus sabdariffa L.) calyx. Plant Sci. Today [Internet]. 2022 Oct. 1 [cited 2024 Nov. 21];9(4):926-33. Available from: https://horizonepublishing.com/journals/index.php/PST/article/view/1796

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