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Effect of plastic packaging on tomato fruits stored at different temperatures and high relative humidity. Quality attributes, shelf life, and chemical properties.

Alsadon A.A., Alhamdan A.M., Obied M.A.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004 page 19

2004

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Effect of plastic packaging on tomato fruits stored at different temperatures and high relative humidity. Quality attributes, shelf life, and chemical properties.  Two types of plastic packaging (low density polyethylene, LDPE, 50 µm and high density to study their effect o­n quality attributes, shelf life and chemical properties of tomato fruits (cv, Red Gold) stored at three temperatures (5, 15, 25 °C) and 97% RH.Percentage of weight loss, disease incidence, progress of fruit colour, TSS and pH were all evaluated during six weeks of storage.Highest and significant weight loss was found in unpacked fruits throughout the storage period.Both LDPE and HDPE treatments gave lowest weight loss.Fungal decay was significant the highest in fruits stored at 25 °C with plastic packaging, and it increased as storage period increased.Unpacked fruits followed by paper packed fruits had less decay.Storage at 15 °C resulted in faster development of fruits colour as compared to other temperatures and at all storage periods.LDPE and HDPE resulted in faster fruit colour but no significant differences were observed between them.

No significant effects of temperature and package materials o­n TSS throughout the storage period. Similarly, no effects were reported o­n pH although the general trend was toward higher pH with increased temperature or storage period.The highest pH value was found in HDPE packed fruits at 15 °C.This study concluded that all chemical properties, quality traits and shelf life of tomato fruits should be considered when selecting packaging materials or storage temperature.Fruits can be stored for up to three weeks at 15 °C if they were package in low density plastic packages since colour progress is slower and shelf life is better than in fruits packaged in high density plastic or paper packages.For longer storage periods, it is recommended to store at 5 °C with either plastic packaging.