The ethylene removal with Bi-On improves the conservation of Golden Japan plum
In the following article, we describe an independent test conducted to evaluate the effect of different conservation techniques, including the ethylene removal with potassium permanganate media, on the quality of Golden Japan plums.
The Golden Japan plum variety is appreciated for its golden colour, firm texture, and taste, which is sweet, aromatic and refreshing.Plum is a climateric fruit, so ethylene significantly affects the colour change, increase in sugars, decrease in acidity, and firmness. It also causes, directly or indirectly, the majority of this plum's physiological disorders.
The CTIFL (Centre Technique Interprofessionnel des Fruits et Légumes - G. Monteils & P. Westercamp, 2006, Montauban, France), an independent centre and leader in the post-harvest sector, carried out tests to study the influence of different refrigeration and conservation techniques on the evolution of the quality of Golden Japan plums stored at a temperature of 0.5ºC for 1.5 months.
The treatments included in the test (each of 3 repetitions of approximately 70 fruits) were:
- Control (normal chilling)
- Delay in refrigeration (10ºC for 48 h before being transferred to 0.5ºC)
- Controlled atmosphere (CA) (2.5% O2 and 2% CO2)
- Controlled atmosphere combined with refrigeration delay (10ºC for 48 h before being transferred to 0.5ºC + CA)
- Controlled atmosphere + ethylene reduction using Bi-On (potassium permanganate media)
The quality parameters measured in the fruit, both when they left the cold storage and after 6 days at 19ºC, were the following: colour, hardness, sugar content, acidity and development of physiological disorders (internal browning and vitrescence).
Below, is a summary of the main results of the study (see Figures 1 and 2):
- The delay in refrigeration caused the appearance of a significantly (p=0.05) more intense colour than in the other treatments, but it had a significantly negative impact (p=0.05) on hardness and the development of vitrescence.
- The controlled atmosphere produced significantly negative results (p=0.05) with regard to hardness, as well as the appearance of internal browning and vitrescence, compared to the control.
- The controlled atmosphere combined with ethylene reduction using Bi-On granules, however, gave significantly positive results (p=0.05) for hardness, internal browning, and vitrescence compared with the other treatments.
In conclusion, the treatment comprising a controlled atmosphere combined with ethylene elimination using Bi-On media containing potassium permanganate best maintained the firmness of the Golden Japan plum and, unlike the other treatments, effectively controlled the development of physiological disorders (internal browning and vitrescence).
Figure 2. Influence of the treatment on pulp vitrescence.