fferent compounds such as polysaccharides, sucrose, minerals,
phenols and flavonoids, and many of them have antioxidant activity.
Quince scaldingwater is rich in phenolic compounds and flavonoids
which provide interesting antioxidant properties, and also contain
organic acids and sugars that are all extracted during scalding. The
addition of quince scalding waters provides color changes and
reduced the sensory scores of yogurts due to its acidic nature. Such
scalding water has inhibitory effect against lactobacilli, probably
due to its high content in polyphenols. As a consequence, quince
scalding water enriched yogurts have higher pH, lower lactic acid
content and probably affected microbial metabolism for example
reducing the release of exopolysaccharides from lactic acid bacteria
compared to control yogurts. Such changes are reflected in their
rheological and textural properties: softer yogurts of higher
deformability and lower elastic behavior and viscosity. During cold
storage of yogurts pH decreases, the gel structure is reinforced,
lactobacilli population decreases (especially in quince enriched
yogurts) and population of molds and yeasts increases. The direct
use of heat treated QSW, although nowadays limited by regulations
may enhance the eco-efficiency of quince industries. Further
researches will be needed as well, to study the possibility of recuperate
bioactive compounds from QSW that would allow their use
as food ingredients (for their antibacterial or antioxidant properties)
or as health promoting agents to ameliorate illness (such as allergy)
or improve the nutritional value of conventional foods.