After long-time storage of apples, decrease of total
soluble solids was observed. In ‘Idared’ cv., total soluble
solids varied from 12.9 g/100 g after 6-month storage for
untreated fruits to 12.2 g/100 g after 1-MCP treatment.
In ‘Shampion’ cv., after 6-month storage, total soluble
solids decreased to 13.8 g/100 g in control samples and
to 13.1 g/100 g after 1-MCP treatment. Generally, after
1-MCP treatment, total soluble solids of apple were about
5.0 % lower compared with untreated fruits. However, still,
total soluble solids are much higher than the minimum
requirements given by AIJN [X] for single-strength juice
and do not restrict its processing into juice.
Long-time storage of apples resulted in a lower titratable
acidity in all samples. In ‘Idared’ cv. after 6-month
storage, titratable acidity decreased from 0.57 g/100 g in
fresh samples to 0.33 g/100 g in control samples and 0.38
g/100 g after 1-MCP treatment. In ‘Shampion’ cv., after
1-MCP treatment, apple acidity decreased to 0.14 g/100
and to 0.15 g/100 g. This is below the minimum content
for authentic juice which is 0.4 g/l [X] and indicates stored
‘Shampion’ fruits should be mixed or processed with cultivars
with higher acidity.
Scientific data indicate that the composition and content
of chemical compounds in fruits mainly depends on