Bibliographic citations
Pérez, C., (2019). Efecto del tiempo de exposición al ultrasonido y la temperatura en las propiedades fisicoquímicas, contenido de vitamina C y microbiológicas de la pulpa de zarzamora (rubus floribundus kunth) [Tesis, Universidad Privada Antenor Orrego - UPAO]. https://hdl.handle.net/20.500.12759/5156
Pérez, C., Efecto del tiempo de exposición al ultrasonido y la temperatura en las propiedades fisicoquímicas, contenido de vitamina C y microbiológicas de la pulpa de zarzamora (rubus floribundus kunth) [Tesis]. : Universidad Privada Antenor Orrego - UPAO; 2019. https://hdl.handle.net/20.500.12759/5156
@misc{renati/372044,
title = "Efecto del tiempo de exposición al ultrasonido y la temperatura en las propiedades fisicoquímicas, contenido de vitamina C y microbiológicas de la pulpa de zarzamora (rubus floribundus kunth)",
author = "Pérez Rodríguez, Carla Vanessa",
publisher = "Universidad Privada Antenor Orrego - UPAO",
year = "2019"
}
The effect of two times (30 and 45 min) of exposure to ultrasound and two temperatures (25 and 40 °C) on titratable acidity, pH, soluble solids content, vitamin C content and mold count was evaluated. Yeasts of the blackberry pulp (Rubus floribundus Kunth). 40 kHz frequency ultrasound was applied with a Branson Model 5800 series CPXH bath ultrasound machine in blackberry pulp samples contained in glass jars. The results showed that the time of exposure to ultrasound and temperature had a significant effect (p <0.005) on titratable acidity, content of soluble solids, vitamin C content, mold and yeast count; regarding pH, there was only significant effect with the exposure time. Duncan's test indicated that the exposure time of 30 min to the ultrasound and the temperature of 40 ºC keep a lower variation of the titratable acidity, the pH, the content of soluble solids and lower mold and yeast count, in the pulp of blackberry (Rubus floribundus Kunth). The exposure time of 30 min and 25 ° C produced the smallest variation in vitamin C content. In conclusion, the best treatment corresponds to an exposure time of 30 min to ultrasound and a temperature of 40 ºC.
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