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Study of the solubility and the metastable zone of 1,3-dihydroxyacetone for the drowning-out process

par Zhu, Yi ;Youssef, D.;Porte, Catherine;Rannou, Alexis;Delplancke, Marie-Paule ;Mi Lung-Somarriba, B. Loï
Référence Journal of crystal growth, 257, 3-4, page (370-377)
Publication Publié, 2003-10

Article révisé par les pairs

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Résumé :

The 1,3-dihydroxyacetone (DHA) is an important raw material in the cosmetic industry for its skin pigmentation property. The DHA is highly soluble in water, which leads to a very important viscosity value and a huge metastable zone width. In addition, the DHA is a heat-sensitive substance. The drowning-out process (water-out or salting-out) is then necessary to reduce the solubility and to favor the mobility of the molecular species in solution. In this work, the solubility curves of DHA in different water/ethanol mixtures have been established experimentally. The turbidimetric method is used successfully to study the metastable zone in the water/ethanol mixture. The results show that the metastable zone is large, both the dissolution and the crystallization of DHA are time consuming, which could be due to the low diffusivity in the high-concentration solutions and at low temperatures. © 2003 Elsevier B.V. All rights reserved.