Thermal Degradation of Linalool-Chemotype Cinnamomum osmophloeum Leaf Essential Oil and Its Stabilization by Microencapsulation with β-Cyclodextrin

• Published in: Molecules (Basel, Switzerland) Vol. 26; no. 2; p. 409
• Main Authors: Chang, Hui-Ting, Lin, Chun-Ya, Hsu, Li-Sheng, Chang, Shang-Tzen
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 14.01.2021; MDPI
• Subjects: Accelerated aging tests; Accelerated tests; Acyclic Monoterpenes - chemistry; Aging; beta-Cyclodextrins - chemistry; Capsules; Cinnamomum - chemistry; Cinnamomum osmophloeum; Cyclodextrins; Drug Stability; Essential oils; Ethanol; Heat; Hot Temperature; Leaves; Limonene; Linalool; microencapsulation; Natural products; Ocimene; Oils & fats; Oils, Volatile - chemistry; Plant Leaves - chemistry; Plant Oils - chemistry; Temperature; Terpinene; Terpinolene; Thermal degradation; β-Cyclodextrin; United States > US; Taiwan; linalool; β-cyclodextrin; Cinnamomum osmophloeum; microencapsulation
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules26020409

The thermal degradation of linalool-chemotype leaf essential oil and the stability effect of microencapsulation of leaf essential oil with β-cyclodextrin were studied. After thermal degradation of linalool-chemotype leaf essential oil, degraded compounds including β-myrcene, -ocimene and -ocimene, were formed through the dehydroxylation of linalool; and ene cyclization also occurs to linalool and its dehydroxylated products to form the compounds such as limonene, terpinolene and α-terpinene. The optimal microencapsulation conditions of leaf essential oil microcapsules were at a leaf essential oil to the β-cyclodextrin ratio of 15:85 and with a solvent ratio (ethanol to water) of 1:5. The maximum yield of leaf essential oil microencapsulated with β-cyclodextrin was 96.5%. According to results from the accelerated dry-heat aging test, β-cyclodextrin was fairly stable at 105 °C, and microencapsulation with β-cyclodextrin can efficiently slow down the emission of linalool-chemotype leaf essential oil.