Changes in physicochemical properties and volatile compounds of roselle (Hibiscus sabdariffa l.) calyx during different drying methods
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Changes in physicochemical properties and volatile compounds of roselle (Hibiscus sabdariffa l.) calyx during different drying methods. / Juhari, Nurul Hanisah; Martens, Helle Jakobe; Petersen, Mikael Agerlin.
In: Molecules, Vol. 26, No. 20, 6260, 2021.Research output: Contribution to journal › Journal article › Research › peer-review
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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
N1 - This article belongs to the Special Issue Volatile Compounds and Smell Chemicals (Odor and Aroma) of Food—Second Edition.
PY - 2021
Y1 - 2021
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 ro-selle 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.
AB - 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 ro-selle 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.
KW - Drying
KW - Dynamic headspace sampling
KW - Microstructure
KW - Physicochemical properties
KW - Roselle (Hibiscus sabdariffa L.)
KW - Volatile compounds
U2 - 10.3390/molecules26206260
DO - 10.3390/molecules26206260
M3 - Journal article
C2 - 34684840
AN - SCOPUS:85117512393
VL - 26
JO - Molecules (Print Archive Edition)
JF - Molecules (Print Archive Edition)
SN - 1431-5157
IS - 20
M1 - 6260
ER -
ID: 283017650