Assessment of fresh Alpinia galanga (A. galanga) drying techniques for the chemical composition of essential oil and its antioxidant and biological activity. (30th October 2022)

• Record Type: Journal Article
• Authors: Ge, Xiangzhen; Liang, Qiuhong; Long, Yao; Shen, Huishan; Zhang, Qian; Sun, Zhuangzhuang; Li, Wenhao
• Is Part Of: Food chemistry. Volume 392(2022)
• Publication Date: 2022-10-30
• Subjects: A. galanga -- Drying method -- Drying characteristics -- Essential oil -- Chemical composition -- Biological activities; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2022.133314
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: A. galanga was dried by hot air (HAD), vacuum (VD) and freeze drying (FD). HAD had the shortest drying time while FD could better maintain microstructure. Volatile components were profiled by E-nose, HS-SPME-GC–MS and HS-SPME-GC-IMS. Statistical modelling and fingerprint clearly discriminated samples. FD best preserved volatiles and had high anti-oxidant/bacterial activity. Abstract: This study evaluated drying characteristics, structure and essential oil chemical composition, and biological activity of A. galanga by hot air drying (HAD), vacuum drying (VD), freeze drying (FD). The results showed that HAD had the shortest drying time while FD could better maintain the microstructure and showed a higher essential oil yield than HAD and VD. In addition, E-nose, HS-GC-IMS and HS-SPME-GC–MS could effectively distinguish the essential oil chemical composition of the four samples because different drying methods induced the changes in the profile and content of the compounds. HS-SPME-GC–MS detected 43 compounds, of which alcohols, alkenes, and esters were the main substances in fresh and dry samples. In comparison, HS-SPME-GC-IMS detected 80 compounds, including alcohols, aldehydes, ketones, esters, alkenes. Overall, the FD samples showed more outstanding advantages by evaluating antioxidant properties and antibacterial activities. FD was more suitable for A. galanga drying as it maintains appearance and biological activity.