Effect of Microwave Treatment on Microbial Contamination of Honeys and in Their Physicochemical and Thermal Properties
More details
Hide details
Publication date: 2015-06-30
Pol. J. Food Nutr. Sci. 2015;65(2):119–126
In recent years, microwave heating has become a common method for pasteurization and sterilization food. Honey is a sweet substance produced by worker honeybees from nectar of flowers. The major microbial contaminants include moulds and yeasts, as well as the spore-forming bacteria, being their counts indicative of honeys’ commercial quality and safety. Paenibacillus larvae is also of interest since it causes American foulbrood (AFB) in honeybee larvae. The main quality factors that are used in the honey international trade are moisture, hydroxymethylfurfural content (HMF), and enzymatic indices. Moreover, honey exhibit several thermal events, the most important being the glass transition temperature (Tg). The aim of this work was to evaluate microwave effect (800 watts during 45 and 90 seconds) on microbial content in particular over P. larvae spores retained in honey, and on physicochemical and thermal properties. Microwave promoted a decrease of microbial count with time of exposure, including P. larvae. Moisture content diminished after treatment, while Tg increased linearly, and acidity decremented in the majority of cases. Honeys darkened and HMF exceeded the permissible value. Diastase and glucose-oxidase enzymes were totally inactivated by microwave treatment.
Microwave processing of honey negatively affects honey antibacterial activity by inactivation of bee-derived glucose oxidase and defensin-1
Marcela Bucekova, Valeria Juricova, Enrique Monton, Simona Martinotti, Elia Ranzato, Juraj Majtan
Food Chemistry
Characterisation of viscosity, colour, 5-hydroxymethylfurfural content and diastase activity in raw rape honey (Brassica napus) at different temperatures
Monika Kędzierska-Matysek, Mariusz Florek, Anna Wolanciuk, Piotr Skałecki, Anna Litwińczuk
Journal of Food Science and Technology
Current status of emerging food processing technologies in Latin America: Novel thermal processing
L. Moreno-Vilet, H.M. Hernández-Hernández, S.J. Villanueva-Rodríguez
Innovative Food Science & Emerging Technologies