Akademik Veri Yönetim Sistemi
Final SensorFINT International Conference, Cordoba, İspanya, 29 - 31 Mayıs 2024, ss.1
Stems
and leaves of Portulaca oleracea L., also known as purslane, contain
nutrients such as omega-3 fatty acids, vitamins A, C, and E, electrolytes like
potassium and sodium, minerals like calcium, magnesium, and phosphorus, as well
as a variety of phenolic compounds. Fortification of yogurt with lyophilized
purslane can help in spreading its consumption, taking advantages of its nutritional,
therapeutic, pharmaceutical, and phytoremediation benefits. However, changes in
yogurt formulation can affect the final product structure and consumer acceptance.
The aim of this study was therefore the evaluation of FT-NIR spectroscopy,
combined with chemometrics, as a tool for monitoring lactic acid fermentation
of lyophilised purslane-fortified yogurt. Two production replicates of set-style
yoghurt with and without lyophilised purslane addition (0.55%) were performed,
monitoring in continuous the fermentation step by FT-NIR spectroscopy with a
transflectance adapter (0.2 cm total effective pathlength) and fundamental
rheology (time sweep test, followed by strain and frequency sweep tests). Moreover,
lactic acid bacteria count was determined at the beginning and the end of the
fermentation. Results showed that the addition of lyophilised purslane had a
beneficial effect on yogurt setting, increasing the firmness of the final gel and
shortening the gelation time, despite the similar development of lactic acid
bacteria. FT-NIR spectroscopy proved to be a valuable tool for monitoring the
fermentation step, being able to detect the anticipated gelation of the
fortified yogurt. Thus, in conclusion the work demonstrated that the
purslane-fortification in yogurt can have beneficial effects in product
structuring, enabling a shortening of the fermentation step. A processing
monitoring method based on FT-NIR spectroscopy can be successfully developed
following the principles of the Process Analytical Technology, thus boosting
the application of smart manufacturing solutions under the frame of the
Industry 4.0 plan.