The effect of different decontamination methods on the microbial load, bioactive components, aroma and colour of spice paprika

• Published in: Food control Vol. 83; pp. 131 - 140
• Main Authors: Molnár, Helga, Bata-Vidács, Ildikó, Baka, Erzsébet, Cserhalmi, Zsuzsanna, Ferenczi, Sándor, Tömösközi-Farkas, Rita, Adányi, Nóra, Székács, András
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2018
• Subjects: Decontamination; Irradiation; Microwave, radio-frequency heat treatment; Spice paprika powder; Steam treatment; Spice paprika powder; Irradiation; Steam treatment; Microwave, radio-frequency heat treatment; Decontamination
• ISSN: 0956-7135; 1873-7129
• DOI: 10.1016/j.foodcont.2017.04.032

Among condiments, paprika is one of the most important ones used both for flavouring and improving other sensorial properties of foods. Because of their agricultural origin, spices are often naturally contaminated with various bacteria due to poor sanitation during growth, harvest, drying, and storage. In this study different decontamination methods were compared regarding microbial decontamination efficacy and maintaining the biochemical, aroma and colour properties. Irradiation and steaming, were found to be highly effective for microbial decontamination of spice paprika powders. Only slight changes were detected due to the decontamination treatment for bioactive component content, however significant changes were observed in the levels of volatile aroma compounds. Alternative decontamination methods, such as microwave heating alone and combined with re-wetting and intensive mixing, or radio-frequency heat treatment alone were also performed to evaluate the effect of these treatments. These methods were found to be less effective in the reduction of the mesophilic aerobic total bacterial counts, while the levels of moulds were significantly reduced, if the samples were held for 10 min at the given incubation temperatures. The treatments did not significantly affect chemical compositional parameters, but sample colour was appeared adversely affected. •Approved and experimental decontamination methods were assessed on spice paprika.•Irradiation was efficient, reducing microbials by 2–4 orders of magnitude.•Steaming was also effective causing a 300-fold decrease in microbial contamination.•Microwave/radiofrequency treatments caused 2–20-fold drops in microbials.•Effects of the treatments on biochemical, aroma compounds and colour were compared.