45 HyaluronicALURONIC acid water binding
molecules, experimental studies have shown the actual hydrogen bonding by glycerol in
dilute aqueous solution is 6.3 ± 1.4.29 Translating that value into the vernacular used in
this study, that would be glycerol binding 1.23 g H
2 O/g, significantly exceeding what has
been experimentally found for HA. This finding agrees with the assertion that glycerol is
the most effective humectant.30
CONCLUSIONS
This work dispels any notion that HA has remarkable water-binding power that makes
it a superior humectant. A role of humectants in cosmetic products is to impede water
loss by evaporation via binding to it. That process inherently requires the involvement of
Figure 8. TGA data for 0.1% (w/w) solution of hyaluronic acid from 30 to 150°C.
Figure 7. TGA data for pure water from 30 to 150°C (control).
molecules, experimental studies have shown the actual hydrogen bonding by glycerol in
dilute aqueous solution is 6.3 ± 1.4.29 Translating that value into the vernacular used in
this study, that would be glycerol binding 1.23 g H
2 O/g, significantly exceeding what has
been experimentally found for HA. This finding agrees with the assertion that glycerol is
the most effective humectant.30
CONCLUSIONS
This work dispels any notion that HA has remarkable water-binding power that makes
it a superior humectant. A role of humectants in cosmetic products is to impede water
loss by evaporation via binding to it. That process inherently requires the involvement of
Figure 8. TGA data for 0.1% (w/w) solution of hyaluronic acid from 30 to 150°C.
Figure 7. TGA data for pure water from 30 to 150°C (control).
