This might be because the hydroxypropyl groups limit the ability of the amylose molecules to coil and align with one another [69] and [70]. In addition, the hydroxypropyl groups on the amylose chain may prevent amylose aggregation and interrupts formation after gelatinization. On the other hand, it seems the covalent bonds established by crosslinking, which can be thought of as adding to the hydrogen bonds in native starch, did not increase the re-association of amylose chains [37].