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Changes in Physicochemical Properties and Volatile Compounds of Roselle (Hibiscus sabdariffa L.) Calyx during Different Drying Methods.
Molecules. 2021 Oct 16; 26(20)M

Abstract

Fresh roselle are high in moisture and deteriorate easily, which makes drying important for extending shelf-life and increasing availability. This study investigated the influence of different drying methods (oven-drying, freeze-drying, vacuum-drying, and sun-drying) on the quality of roselle calyx expressed as physicochemical properties (moisture content, water activity, soluble solids, color), volatile compounds, and microstructure. Oven-drying and freeze-drying reduced moisture content most while vacuum-drying and sun-drying were not as efficient. All drying methods except sun-drying resulted in water activities low enough to ensure safety and quality. Vacuum-drying had no impact on color of the dry calyx and only small impact on color of water extract of calyx. Drying reduced terpenes, aldehydes, and esters but increased furans. This is expected to reduce fruity, floral, spicy, and green odors and increase caramel-like aroma. Sun-drying produced more ketones, alcohols, and esters. Scanning electron microscopy revealed that freeze-drying preserved the cell structure better, and freeze-dried samples resembled fresh samples most compared to other drying techniques. The study concludes that freeze-drying should be considered as a suitable drying method, especially with respect to preservation of structure.

Authors+Show Affiliations

Department of Food Service and Management, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia.Section for Forest, Nature and Biomass, Department of Geoscience and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, DK-1958 Frederiksberg, Denmark.Design and Consumer Behaviour, Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, DK-1958 Frederiksberg, Denmark.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

34684840

Citation

Juhari, Nurul Hanisah, et al. "Changes in Physicochemical Properties and Volatile Compounds of Roselle (Hibiscus Sabdariffa L.) Calyx During Different Drying Methods." Molecules (Basel, Switzerland), vol. 26, no. 20, 2021.
Juhari NH, Martens HJ, Petersen MA. Changes in Physicochemical Properties and Volatile Compounds of Roselle (Hibiscus sabdariffa L.) Calyx during Different Drying Methods. Molecules. 2021;26(20).
Juhari, N. H., Martens, H. J., & Petersen, M. A. (2021). Changes in Physicochemical Properties and Volatile Compounds of Roselle (Hibiscus sabdariffa L.) Calyx during Different Drying Methods. Molecules (Basel, Switzerland), 26(20). https://doi.org/10.3390/molecules26206260
Juhari NH, Martens HJ, Petersen MA. Changes in Physicochemical Properties and Volatile Compounds of Roselle (Hibiscus Sabdariffa L.) Calyx During Different Drying Methods. Molecules. 2021 Oct 16;26(20) PubMed PMID: 34684840.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Changes in Physicochemical Properties and Volatile Compounds of Roselle (Hibiscus sabdariffa L.) Calyx during Different Drying Methods. AU - Juhari,Nurul Hanisah, AU - Martens,Helle Jakobe, AU - Petersen,Mikael Agerlin, Y1 - 2021/10/16/ PY - 2021/09/13/received PY - 2021/10/01/revised PY - 2021/10/09/accepted PY - 2021/10/23/entrez PY - 2021/10/24/pubmed PY - 2021/11/20/medline KW - drying KW - dynamic headspace sampling KW - microstructure KW - physicochemical properties KW - roselle (Hibiscus sabdariffa L.) KW - volatile compounds JF - Molecules (Basel, Switzerland) JO - Molecules VL - 26 IS - 20 N2 - Fresh roselle are high in moisture and deteriorate easily, which makes drying important for extending shelf-life and increasing availability. This study investigated the influence of different drying methods (oven-drying, freeze-drying, vacuum-drying, and sun-drying) on the quality of roselle calyx expressed as physicochemical properties (moisture content, water activity, soluble solids, color), volatile compounds, and microstructure. Oven-drying and freeze-drying reduced moisture content most while vacuum-drying and sun-drying were not as efficient. All drying methods except sun-drying resulted in water activities low enough to ensure safety and quality. Vacuum-drying had no impact on color of the dry calyx and only small impact on color of water extract of calyx. Drying reduced terpenes, aldehydes, and esters but increased furans. This is expected to reduce fruity, floral, spicy, and green odors and increase caramel-like aroma. Sun-drying produced more ketones, alcohols, and esters. Scanning electron microscopy revealed that freeze-drying preserved the cell structure better, and freeze-dried samples resembled fresh samples most compared to other drying techniques. The study concludes that freeze-drying should be considered as a suitable drying method, especially with respect to preservation of structure. SN - 1420-3049 UR - https://www.unboundmedicine.com/medline/citation/34684840/Changes_in_Physicochemical_Properties_and_Volatile_Compounds_of_Roselle__Hibiscus_sabdariffa_L___Calyx_during_Different_Drying_Methods_ DB - PRIME DP - Unbound Medicine ER -