Headspace solid-phase microextraction analysis of volatile components in Phalaenopsis Nobby's Pacific Sunset

Area of Science:

• Plant science
• Orchidaceae family research
• Aromatic compound analysis

Background:

• Phalaenopsis orchids are economically significant within the Orchidaceae family.
• While diverse in color, few Phalaenopsis species possess a notable aroma.
• Understanding orchid volatile profiles is crucial for breeding and commercialization.

Purpose of the Study:

• To identify and quantify volatile organic compounds (VOCs) contributing to the aroma of Phalaenopsis Nobby's Pacific Sunset.
• To determine the optimal conditions for extracting these volatile components.
• To investigate the diurnal and tissue-specific patterns of odor emission.

Main Methods:

• Solid-phase microextraction (SPME) was employed for sample preparation.
• Gas chromatography (GC) was used for separating volatile compounds.
• Gas chromatography/mass spectrometry (GC-MS) enabled compound identification and quantification.

Main Results:

• The DVB/CAR/PDMS fiber proved optimal for SPME extraction.
• A total of 31 volatile compounds were identified, with geraniol, linalool, and α-farnesene being predominant.
• Peak odor concentration occurred between 09:00 and 13:00 on the eighth day of storage.
• Dorsal sepals and petals exhibited the highest odor concentrations, while the column had the lowest.

Conclusions:

• The study successfully characterized the volatile profile of Phalaenopsis Nobby's Pacific Sunset.
• Geraniol, linalool, and α-farnesene are key contributors to its aroma.
• Odor emission is influenced by time of day, storage duration, and specific floral tissues.