Chapter 7 B1 -G-G-G- presence or absence give rise to different repeat units( Pyr not present with 2x A G= D Ac=acetate 4, 6-2 pyr Pyr= pyruvate ooo6o9oa。9o9。0 sntermsolecuyar Figure 7. 3 The structure of xanthan illustrated in three ways(a, b, c). SAQ 7.2 Complete the illustration of the repeat unit in xanthan by adding bonds and ups to the molecule(similar to the illustration in Figure 7.2a). Refer to Figures 7.1 and 7. 3 for chemical structures ∏ Examine Figure 7.3 and give two reasons why xanthan has an anionic natur The anionic nature of xanthan arises from the presence of glucuronic adid and pyruvate200 Chapter 7 v I Figure 7.3 The structure of xanthan illustrated in three ways (a, b, c). Complete the illustration of the repeat unit in xanthan by adding bonds and groups to the molecule (similar to the illustration in Figure 7.2a). Refer to Figures 7.1 and 7.3 for chemical structures. n Examine Figure 7.3 and give two reasons why xanthan has an anionic MM. The anionic nature of xanthan arises from the presence of glucuronic acid and pyruvate