RICESORB® FOR LOOSE FACE POWDERS 301 CONCL USIONS AND FUTURE WORK In th e current study, RiceSorb® was introduced to be used as a talcum substitute in loose face powder preparation. First, the general physiochemical properties of single talcum and RiceSorb® were examined. These included morphology, bulk density, fl ow property, and pH. It was found that the physicochemical properties of RiceSorb® and talcum were distinctly different. The SEM image revealed that the surfaces of RiceSorb® were rather smooth with almost spherical shapes, whereas talcum had rough surfaces. In addition, the sizes of RiceSorb® (about 6 μm) were markedly smaller than those of talcum (25 μm). The bulk density, angle of repose, and pH of talcum were obviously greater than those of RiceSorb®. After that, the preparation of loose face powders which contained talcum and RiceSorb® at various ratios (4:0, 3:1, 1:1, 1:3, and 0:4) was formulated and tested for their physicochemical characteristics. The colors of the prepared loose face powders were creamy yellow with melanin index between 0.6 and 0.8. The physicochemical properties of loose face powders depended on the proportion of RiceSorb® in the formulations. The changes were clearly observed in the formulations which contained only talcum, FT0, or only RiceSorb®, FT4. Overall, the results indicate that RiceSorb® may be used as a tal- cum substitute. Nevertheless, its drawback concerning moisture absorption should be solved. To keep the RiceSorb®-containing formulations from moisture, we are planning to add suitable moisture absorbers such as silica to the loose face powders. In addition, a moisture barrier packaging is another alternative. ACKNOWLEDGMENTS We wish to express our deep gratitude and appreciation to the Faculty of Pharmaceutical Sciences, Prince of Songkla University, Thailand, for providing fi nancial support to our group (PHA6204026S). REFERENCES (1) R. Korichi and J. F. Tranchant, “Decorative products,” in Handbook of Cosmetic Sciences and Technol- ogy, 4th Ed., A. O. Barel, M. Paye, and H. I. Maibach. Eds. (CRC Press, Taylor & Francis Group, New York, 2014), pp. 439–451. (2) P. Riley, “Dec o rative cosmetics,” in Poucher’s Perfumes, Cosmetics and Soaps, 10th Ed., H. Butler. Ed. (Kluwer Academic Publishers, London, 2000), pp. 167–216. (3) C. Franka and L . Jorge, An uncommon hazard: pulmonary talcosis as a result of recurrent aspiration of baby powder, Respir. Med. CME, 4, 109–111 (2011). (4) G. Verlynde, E . Agneessens, and J. L. Dargent, Pulmonary talcosis due to daily inhalation of talc pow- der. Images in clinical radiology, J. Belg. Soc. Radiol., 102(1), 12 (2018). (5) J. Marto, I. J o rge, A. de Almeida, and H. M. Ribeiro, “Novel starch-derived topical delivery systems,” in Carrier-Mediated Dermal Delivery: Applications in the Prevention and Treatment of Skin Disorders., 1st Ed., A. Ascenso, H. Ribeiro, and S. Simões. Eds. (Jenny Stanford Publishing, Singapore, 2017), pp. 175–216. (6) RiceSorb® (Rice S tarch oil absorbent), accessed February 2019, http://www.myskinrecipes.com/shop/ attachment.php?id_attachment=222&id_product=64. (7) A. S. Ribeiro, M. Estanqueiro, M. B. Oliveira, and J. M. Sousa Lobo, Main benefi ts and applicability of plant extracts in skin care products, Cosmetics, 2, 48–65 (2015). (8) A. P. P. Menezes, S. C. C. Trevisan, S. M. Barbalho, an d E. L. Guiguer, Tamarindus indica L. a plant with multiple medicinal purposes. J. Pharmacogn. Phytochem., 5(3), 50–54 (2016). (9) S. S. Bhadoriya, A. Ganeshpurkar, J. Narwaria, G. Rai, a nd A. P. Jain, Tamarindus indica: extent of ex- plored potential, Pharmacogn. Rev., 5(9), 73–81 (2011).

JOURNAL OF COSMETIC SCIENCE 302 (10) The United States Pharmacopeial Convention, USP 41/NF 3 6 (United Book Press, Maryland, 2018), Vol. 1, pp. 6360–6362. (11) Thailand Industrial Standards Institute, Thai Industria l Standards (TIS) for Cosmetics: Loose Face Pow- ders (TIS 443-2525) (Ministry of Industry, Bangkok, 1982), pp. 1–14. (12) The Cosmetic, Toiletry, and Fragrance Association (CTF A ), Cosmetic Europe: Guideline on Stability of Cosmetic Products, March 2004, accessed February 22, 2019, https://www.cosmeticseurope.eu. (13) H. M. B. Al-Hashemi and O. S. B. Al-Amoudi, A review on the angle of repose of granular materials. Powder Technol., 330, 397–417 (2018).