SENSE-IMPROVING AGENT
Disclosed are: a sense-improving agent which comprises, as an active ingredient, a phospholipid or a sphingosine-containing phospholipid and/or a derivative thereof, particularly a sphingomyelin, and which has an effect of improving the dulling of senses at a periphery when ingested orally or directly applied to the skin; and a sense-improving food, beverage, feed or cosmetic comprising the sense-improving agent. The phospholipid to be used may be a chemically synthesized phospholipid or a naturally occurring phospholipid, preferably a phospholipid derived from an edible material such as soybean and egg yolk, particularly preferably a phospholipid derived from milk.
1 . A skin sensitivity improving agent comprising a phospholipid as an active ingredient.
2 . A skin sensitivity improving agent comprising a milk-derived phospholipid as an active ingredient.
3 . The skin sensitivity improving agent according to claim 2 , wherein the milk-derived phospholipid is a composition (milk-derived phospholipid-containing composition) that is obtained from milk or a milk material and contains a phospholipid in an amount of 10 wt % or more based on the total solid content.
4 . The skin sensitivity improving agent according to claim 2 , wherein the milk-derived phospholipid-containing composition is obtained by treating milk or a milk material using a microfiltration (MF) membrane having a pore diameter of 0.1 to 2.0 μm or an ultrafiltration (UF) membrane having a molecular weight cut-off of 5 to 500 kDa.
5 . The skin sensitivity improving agent according to claim 2 , wherein the milk-derived phospholipid-containing composition is obtained by adding an acid to milk or a milk material to adjust the pH to 4.0 to 5.0, removing a casein protein as a precipitate, and treating the resultant using an MF membrane having a pore diameter of 0.1 to 2.0 μm or a UF membrane having a molecular weight cut-off of 5 to 500 kDa.
6 . The skin sensitivity improving agent according to claim 3 , wherein the milk or the milk material is butter serum or buttermilk.
7 . A skin sensitivity improving agent comprising a sphingosine-containing phospholipid and/or a derivative thereof as an active ingredient.
8 . The skin sensitivity improving agent according to claim 7 , wherein the sphingosine-containing phospholipid is sphingomyelin.
9 . A sensation-improving food, drink, feed, or cosmetic comprising the skin sensitivity improving agent according to claim 1 .
10 . A method of producing a skin sensitivity improving agent that comprises a milk-derived phospholipid-containing composition as an active ingredient, the method comprising treating milk or a milk material using a microfiltration (MF) membrane having a pore diameter of 0.1 to 2.0 μm or an ultrafiltration (UF) membrane having a molecular weight cut-off of 5 to 500 kDa to obtain the milk-derived phospholipid-containing composition.
11 . The method according to claim 10 , further comprising adding an acid to the milk or the milk material to adjust the pH to 4.0 to 5.0, and removing a casein protein as a precipitate before treating the milk or the milk material using the MF membrane or the UF membrane.