The effect of furcellaran-gelatin edible coatings with green and pu-erh tea extracts on the microbiological, physicochemical and sensory changes of salmon sushi stored at 4 °C

Piotr Kulawik , Ewelina Jamróz , Marzena Zając , Paulina Guzik , Joanna Tkaczewska


This study investigated the effect of application of previously designed furcellaran-gelatin edible coatings with 20% green (GT) and pu-erh (RT) tea extracts on the changes in the cold stored salmon nigiri. Nigiri samples were divided into four groups (control, film control, GT and RT) and analyzed for their microbiological quality (total aerobic bacteria, total psychrotrophic bacteria, lactic acid bacteria, yeasts and moulds and thermotolerant coliforms), sensory scores and physicochemical properties (pH, water activity, dry weight, color, shear force, TBARS and TVB-N) during 8 days of storage at 4 °C. The treatment did not affect the shelf-life of the stored sushi, with total aerobic bacteria counts reaching the upper acceptability limits between day 4 and 6 of storage, while the sensory panelists discarded sushi only after 6–8 days of storage. The sensory analysis showed that although the panelists observed the differences between the coated samples and the control, there were no significant differences in sensory scores between the groups. The treatment significantly inhibited the oxidation, with TBARS at day 8 reaching for GT and control 0.47 and 0.81 mg/kg respectively. The TVB-N of the samples remained constant despite progressive microbiological contamination of the samples, reaching the maximum of 109.8 mg/kg. No other physicochemical properties have been affected by the treatment with the exception of color. Despite the promising results of in vitro studies on dry films with GT and RT extracts, their application on salmon nigiri did not prove beneficial in terms of shelf-life extension.
Author Piotr Kulawik (FoFT / DoAPT)
Piotr Kulawik,,
- Department of Animal Product Technology
, Ewelina Jamróz (FoFT / IoCh)
Ewelina Jamróz,,
- Institute of chemistry
, Marzena Zając (FoFT / DoAPT)
Marzena Zając,,
- Department of Animal Product Technology
, Paulina Guzik (FoFT / DoAPT)
Paulina Guzik,,
- Department of Animal Product Technology
, Joanna Tkaczewska (FoFT / DoAPT)
Joanna Tkaczewska,,
- Department of Animal Product Technology
Journal seriesFood Control, ISSN 0956-7135, e-ISSN 1873-7129, (N/A 140 pkt)
Issue year2019
Publication size in sheets0.5
Keywords in EnglishEdible coatings, Sushi, Furcellaran, Gelatin, Tea extracts, Shelf-life
ASJC Classification1106 Food Science; 1305 Biotechnology
Internal identifierWTŻ/2019/10
Languageen angielski
Score (nominal)140
Score sourcejournalList
Publication indicators WoS Citations = 5; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.731; WoS Impact Factor: 2018 = 4.248 (2) - 2018=4.391 (5)
Citation count*
Additional fields
FinansowaniePart of the research was supported by research grant no. BM-4742/KPPZ/17 from the University of Agriculture in Cracow.
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