New Zealand Journal of Crop and Horticultural Science
abstracts
Preliminary investigation into the uneven ripening of banana (Musa sp.)
peel
Giovanni De Martino
Fabio Mencarelli
Department of Food Science and Technology
University of Tuscia
Via De Lellis 01100
Viterbo, Italy
email: demartino@unitus.it
John B. Golding
New South Wales Department of Primary
Industries
Gosford Horticultural Institute
Locked Bag 26, Gosford
NSW, Australia
Abstract Mature green bananas (Musa sp., AAA group,
Cavendish subgroup, cultivar ‘Williams’) were used to examine the
uneven de-greening of banana peel treated with 1-methylcyclopropene (1-MCP).
After ethylene treatment (200 µl litre–1 for 24 h at 20°C)
bananas were allocated different treatment units: 1-MCP treatment (200 nl litre–1 ,
20°C, 24 h); nitrogen treatment (O2<0.1%, 20°C, 24 h); ethanol treatment
(0.3 ml litre–1 , 20°C, 24 h); chilling treatment (1±1°C,
24 h); and untreated control (20°C). After these post-ripening treatments
(24 h), fruit were stored in perforated plastic bags at 20°C. Ethylene,
respiration, ethanol and acetaldehyde production, skin colour, chlorophyll
fluorescence, chlorophyll content, and flesh firmness were assessed at regular
intervals. The post-ripening nitrogen atmosphere and chilling treatment (24
h) led to a transient delay of ripening compared to ethanol-treated fruit and
untreated control fruit. However by 1 week of shelf life at 20°C, there
were no differences between non-1-MCP treated fruit. No differences in the
accumulation of acetaldehyde and ethanol were detected during storage. Ethylene
production was not affected by the 1-MCP treatment 24 h after initiating ripening.
However peel de-greening, the decrease in chlorophyll content and chlorophyll
fluorescence were delayed with 1-MCP treatment. There was some general browning
throughout the 1-MCP treated peel in both the green and yellow areas of the
ripening peel. It appears the 1-MCP treated peel 24 h after ethylene treatment
may still undertake some normal senescence that occurs during banana ripening.
Keywords 1-MCP treatment; colour development; chlorophyll;
ethanol
New Zealand Journal of Crop and Horticultural Science, 2007, Vol. 35:
193–199
0014–0671/07/3502–0193 © The Royal
Society of New Zealand 2007
H05132; Online publication date 11 May 2007. Received 31 October 2005;
accepted 1 September 2006
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