This study sampled six different
juniper types in Bulgaria to evaluate
essential oil composition, antioxidant and antimicrobial activity. The
main constituent of the various
junipers was identified as a-pinene.
Though the different junipers did
not demonstrate high antimicrobial
activity, juniper may be useful in
agricultural applications, such as
biopesticides for organic products.
These antimicrobial properties can be utilized in another key
area: food preservation. Erika-Beáta Kerekes, Department of
Microbiology, University of Szeged,
studied essential oil compositions
to extend the shelf life of foods.
For example, oregano essential oil
contributed to 20 more days on the
shelf for vacuum-packed octopus; and 1% cinnamon
inhibited Listeria monocytogenes (L. monocytogenes)
growth in high fat cheese. Additionally, the study
found that essential oils inhibited the formation
of L. monocytogenes biofilm in chicken, grape
juice, strawberries and cherry tomatoes. Kerekes
explained that this could contribute to active or
smart packaging and edible/biodegradable film in
foods. In cooked pork, microbial stability also was
improved using caraway oil, explained Branislav
Šojić, Faculty of Technology, University of Novi Sad.
Quality control continues to be a pertinent topic
in the industry. To this end, gas chromatography/
mass spectrometry (GC/MS) is regarded as a valuable
fingerprinting technique for essential oils, explained
Andreas Klingberg, Lablicate GmbH. His company’s
extension of the OpenChroma chromatography
software, ChromIdentb, builds reference libraries
based on each sample’s chromatographic fingerprint.
This allows the user to select all detected peaks or
just a subgroup within the sample, e.g., terpenes, for
a clearer comparison.
Essential Oils for Wellness, and Citrus
Our sense of smell is triggered by the activation of
odorant receptors (ORs) expressed at the surface of
olfactory sensory neurons, explained Jérémie Topin,
Institut de Chimie de Nice. Topin investigated the
effect of olfactory adaptation to different odorants
in isolated molecules from essential oils. In relation,
Jérôme Golebiowski, Institute de Chimie de Nice
and Department of Brain Cognitive Science, DGIST,
discussed the chemistry, biology and psychology of
The aroma profile of Thai tea leaves was studied
in a presentation by Toshio Hasegawa, Graduate
School of Science and Engineering, Saitama
University. Among the three types of tea—green,
black and oolong—each exhibits different organoleptic characteristics. Hasegawa discussed the
results of his team’s study, which found, using
a fractional distillation of hexane extracts, that
several compounds contribute to the odor of the
different varieties of green tea.
In phytotherapy, plant volatiles also serve as a
basis to treat respiratory infections; e.g., in tinc-tures/syrups, lozenges, inhalers, etc., explained
Marketa Houdkova, Department of Crop Sciences
and Agroforestry, Czech University of Life Sciences
Prague. Using a new broth microdilution volatil-ization method, Houdkova and co-investigators
determined the antibacterial potential of plant
volatiles in liquid and vapor phases at different
concentrations against bacteria associated with
respiratory disease. By determining the numerous
volatile constituents displaying antibacterial activity,
Houdkova explained this method can contribute to
the development of various medicinal, agricultural
and food applications for volatile antimicrobials.
Throughout the conference, one pertinent question remained up in the air: Why do plants produce
volatiles? Numerous factors contribute to plant
volatile production, whether it is protection from
predators or attracting pollinators.
Plants are the basis of all things, explained Éva
Németh Zámboriné, Ph.D., Department of
Medicinal and Aromatic Plants, Szent István
University, and stress behavior in plants to exter-
nal factors has been a relatively hot topic within
the last decade. These external factors include a,b OpenChrom and ChromIdent are registered trademarks of Lablicate GmbH
ISEO’s content focused on the technical and academic findings on essential oils and volatiles.