WATER-IN-OIL EMULSIONS Table III Physical Properties of Amino Acids and their Salts 303 Number L-Amino Acid and Solubility (6) Y-N a Salt thereof g/100gH20[25øC] Inorganic Organic Gel Formation I L-Alanine 16.51 220 60 2 •-Alanine 55.50 220 60 3 L-Argmine 146 (20øC) 410 120 4 L-Argmine HCL 90.0 810 120 5 L-Asparagine H•O 3.00 420 80 6 L-Aspartic acid 0.50 370 80 7 L-Asparate Na-H20 80.1 870 80 8 L-Cystine 0.011 240 100 9 L-Glutamic acid 0.84 370 100 10 L-Glutarnate Na-H•O 74•22 870 80 11 L-Glut amine 4.25 420 100 12 Glycine 24.99 220 40 13 L-Histidine 4 29 352 120 14 L-Histidine HCL-H20 39 0 (24øC) 752 120 15 Hydroxy L-proline 36.11 330 100 16 L-Isoleucme 4.12 220 110 17 L-Leucine 2.19 220 110 18 L-Lysme HCL 89.0 690 120 19 L-Methionine 5.92 230 140 20 L-Phenylalamne 2.97 231 180 21 L-Prohne 162.3 230 100 22 L-Serine 43.0 320 60 23 L-Threonine 10.0 320 80 24 L-Tryptophan 1.14 321 220 25 L-Tyrosine 0 045 341 180 26 L-Valine 8 85 220 90 Evaluation: (o) good (e) poor (X) impossible. Table IV The Relationship of Water Content and Spacing to the Stability of Gel and W/O Cream Test Items Stability Gel's Water Gel Aqueous Content Spacing 1 7 30 1 Solution (per cent) (•.) day days days day W/O Cream 7 30 days days Water 5,93 37.6 5 per cent monosodium 5.49 37.1 L-glutamate H20 20 per cent monosodium 4.49 34.9 L-glutamate 40 per cent monosodium 3.12 33.8 L-glutamate H20 20 per cent potassium 7.32 40.4 thiocyanate 20 per cent urea 6.91 39.2 Evaluation:good•--o • A X X•Poor

304 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Table V The Properties of the Creams Obtained from the Gels Prepared by the Addition of an Amino acid, and without an Amino acid Physical Properties of Cream Stability of Cream Viscosity Hardness Emulsion After 1 Day Number 70øC 30øC 0øC 25øC 3]øC Particles 0øC 25øC 37øC After 30 Days 0øC 25øC 37øC cps (1) a 18000 94400 42 11 6 (See Fig. 18(a)) o o o (2) b 13900 101600 53 15 7 o o o (3) e 8500 36000 12 3 1 (See Fig. 18(b)) (4) • 5750 38400 15 4 1 O' o o o o o o , x • X x : Evaluation:good*--o g} a x X•poor. a(1) 40 per cent aqueous solution of monosodium L-glutamate monohydrate•Sunsoft © O-30B. b(2) 40 per cent aqueous solution of monosodium L-glutamare monohydrate-POEM © O-72-D. c(3) Water- Sunsoft © O-30B. •(4) Water-POEM © O-72-D. Table VI The Relationship of the X-Ray Diffraction Patterns of the Surfactanrs to their Gel-Forming Function and the Properties of W/O Emulsions using the Gels Surfactant X-Ray W/O Emulsion's Diffraction Gel- Stability Viscosity Name Pattern Formation (RT) (30øC) Sunsoft © O-30B a Clear o o 94400 H DIG-EIS b Clear o o 112800 Emalex © EG-O c Indistinct x X -- (two-phase separations) i•:il ' Eraalex © 300dxo ½ Indistinct x x 1750 Emalex © 503 c No'•peak x x 750 Nikkol © MIO-2 '• No peak x X ::':":• (two-phase separations) '•. •Taiyo Kagaku Co., Ltd. (62 Akahori, Yokkaichi, Mie, Japan). bMatsumoto Trading Co., Ltd. (3-1 Nihonbashihoncho, Chuoku, Tokyo, Japan). •5 Nihon Emulsion Co., Ltd. (5-32-7 Minami, Koenji, Suginamiku, Tokyo,Japan). aNikko Chemicals Co., Ltd. (1-4-8 Bakurocho, Nihonbashi, Chuoku, Tokyo, Japan).