Figure 5.

Model of vacuolar invertase action in banana fruit, linked to the identity of FOS. Typically, vacuolar invertases use water as acceptor substrate, producing glucose and fructose. However, increased fructose and sucrose levels may lead to the replacement of water as acceptor substrate by sucrose and fructose. In particular, inulobiose may be produced from sucrose (donor substrate) and fructose (acceptor substrate). The produced inulobiose can be used as acceptor substrate to produce inulotriose. Furthermore, the three kestoses (1-kestotriose, 6-kestotriose, and 6G-kestotriose) can be produced when sucrose acts as an acceptor substrate.