Decrease in the DP 11–20 component and increase
in fructose and sucrose were seen in the 20-week
mature tubers compared with 16–18 weeks, which had
higher DP fractions and lower contents of sugar. However, the dry matter, which estimate carbohydrate content or tubers yield, was lower than for late-maturity
tubers. Therefore, 18 weeks seems to be the optimum
harvest time for locally grown Jerusalem artichokes
on the basis of the amount of high-DP inulin and affected the quality and DP distribution profile of the
inulin. Increased sucrose and DP 3–10, with decreased
DP > 10 fractions were observed in the 2 and 5 ◦C
cold storage tubers after 4–6-weeks storage, whereas
inulin composition remained unchanged with frozen
storage ( −18 ◦C) for 3 months. A series of second
fructan, inulo-n-ose appeared in cold storage tubers.
Inulo-n-ose increased as storage time increased, while
inulo-tri-ose (3 ) and inulo-tetra-ose (4 ) were predominant throughout the 12-week study period. There were
no second fructan series found with frozen storage.
dry matter content. Storage temperature and duration