Caryophyllene sesquiterpenoids with various ring systems from the fungus Pestalotiopsis chamaeropis

The encapsulation strategies of clove essential oil enhance its delivery effect in food preservation applications

Food supply chain faces challenges from quality degradation, microbial contamination, and chemical synthetic fungicides. Recently, the remarkable food preserving ability and biological activity of natural clove essential oil (CEO) has gained significant attention. However, its application is limited by volatility, photothermal sensitivity, and inherent odor. To this end, encapsulation strategies have been attempted on CEO to enhance its bioavailability, as well as their efficacy in food preservation scenarios. This study outlines CEO's chemistry and delves into its antimicrobial/antioxidant mechanisms. Subsequently, latest advances in encapsulation strategies for CEO in food preservation are comprehensively reviewed, including film blending, emulsification techniques, polyelectrolyte complexation, ion gelation, etc. The encapsulation enhances CEO's benefits, augmenting its long-term bioavailability in diverse food preservation systems. Finally, CEO's security and limitations are also discussed in-depth. This work aims to compile recent trends in encapsulation strategies for active substances and guide judicious utilize for natural CEO preservative.

Efficient Extraction, Chemical Characterization, and Bioactivity of Essential Oil From Pine Needles

INTRODUCTION

Pine needles are a rich source of bioactive compounds, and there are few reports on the extraction and identification of active substances in various types of pine needles.

OBJECTIVES

The objective of this study is to enhance the efficiency and yield of pine needle essential oil extraction by employing an innovative ultrasonic-assisted salt-out hydrodistillation technology. It also aims to establish a correlation between gas chromatography-mass spectrometry (GC-MS) and electronic nose (E-nose) to distinguish essential oils from Cedrus deodara, Pinus thunbergii, Pinus massoniana, and Pinus koraiensis.

METHODS

Optimal extraction conditions will be determined through dynamic curve fitting and response surface analysis. Essential oils will be analyzed by E-nose and GC-MS coupled with chemometrics. Radical-scavenging effects on ·OH, DPPH·, ABTS+ radicals, and antibacterial activity against Escherichia coli and Staphylococcus aureus will be evaluated.

RESULTS

Optimal extraction conditions were 100 min of distillation, 7.762% sodium chloride, 9.596-mL/g liquid material ratio, and 170.155-W ultrasonic power. Essential oil yields were 0.144%, 0.214%, 0.425%, and 0.852% for C. deodara, P. thunbergii, P. massoniana, and P. koraiensis, respectively. GC-MS identified 74 volatile components. PLS-DA revealed nine key compounds, including α-Myrcene, α-Pinene, α-Phellandrene, Limonene, Caryophyllene, Bornyl acetate, β-Pinene, Germacrene D, and Camphene. PCA of E-nose and GC-MS data highlighted sample differences. All essential oils exhibited antioxidant and antibacterial activities, linked to α-pinene, β-Pinene, and Germacrene D.

CONCLUSION

This study introduces efficient methods for efficient extraction and characterization of pine needle essential oils, providing a foundation for bioactive applications and enhancing product quality and global innovation in the industry.

Caryophyllene-type sesquiterpenes from the endophytic fungus Pestalotiopsis lespedezae through an OSMAC approach

Two new caryophyllene-type sesquiterpenes pestalotiopsins U and V (1 and 2) and three known compounds pestalotiopsin B (7), pestaloporinate B (8), and pestalotiopsin C (9) were isolated by the cultivation of the endophytic fungus Pestalotiopsis lespedezae on solid rice medium, while four additional new caryophyllene pestalotiopsins W-Z (3-6) were obtained when 3.5% NaI was added to the fungal culture medium. The structures of the new compounds were determined by HRESIMS and 1D/2D nuclear magnetic resonance data. Compounds 1-9 were tested for cytotoxicity against the mouse lymphoma cell line L5178Y, but only 6 displayed significant activity with an IC50 value of 2.4 μM.