Xyloglucan (XG) and pectin, along with cellulose are major primary cell wall components. Studies of their interactions can provide a better understanding of the assembly of the primary cell wall. The adsorption of pectin rich in galacturonic acid (>74%) and polygalacturonic acid (PGA) from citrus fruits onto different substrates, including regenerated cellulose (RC) and gold (Au), was studied via quartz crystal microbalance with dissipation monitoring (QCM-D) under different solution conditions. The best coatings for all surfaces were for pectin and PGA adsorbed from the citric phosphate buffer (50 mM, pH = 5.0). Pectin and PGA form better coatings on Au than RC surfaces with complete inhibition of irreversible XG adsorption.  Likewise, XG adsorption onto RC completely inhibits pectin adsorption.  These results indicate that there is no significant or negligible interaction between xyloglucan and pectins with high galacturonic acid content.

Pectin and polygalacturonic acid: Their model surfaces and interactions with cellulose and xyloglucan

243rd National Meeting (2012)

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