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Abstract
65
KOUCHI
Fuculty of Bio Science and Ap-
plied Chemistry, Hosei University, Kajinocho , Koganei-shi, Tokyo , Japan.
Nozawa spa, Sulfur hot spring water, Skin Elasticity, ORP, Melanin, Cutaneous
permeability, Aging of hot spring water
J. Hot Spring Sci.
In Nozawa spa area (Nagano Prefecture), ORP (Oxidation-Reduction Potential)-pH
measurements were made on hot spring waters fresh out of wellheads (sulfur-containing
sodium-calcium-sulfate springs, and sulfur springs) and hot spring waters at bathtubs of
communal bathhouses, showing the favorable results that both the wellhead waters
and bathhouse waters are reductive in terms of ORP-pH relationship. More specifically,
just a slight di erence was found in ORP between these waters ; hence it can be appre-
ciated that, at the communal bathhouses, reductive hot spring waters are almost as fresh
as the wellhead waters. In skin ORP-pH measurements, it was observed that experimen-
tal daily bathing in reductive hot spring waters over a period of two months brought
about a decreasing tendency in ORP of the skins of the volunteer subjects. This signifies
that habitual bathing in reductive water could suppress oxidation of the skin and lipid
thereof.
We also revealed that habitual bathing in Nozawa spa can improve or recover skin
elasticity, and that the reductive sulfur spring water has an advantageous e ect of
suppressing melanin formation causes blotches and freckles or pigmentary deposits at
sunburn. The data obtained provide collaborative support for the generally accepted
notion that sulfur spring water will make the skin lustrous. Further, as having been
generally said that the beneficial e ects and e cacies of hot spring water are lost with its
aging, the present work has confirmed that the aging of hot spring water results in nulli-
fication of its beneficial e ect of suppressing melanin formation in the skin.
Key wards :
Shoichi O
E ects of Nozawa Spa (Sulfur Hot Spring Water)
with Reductive Characteristic on the Skin
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66
ORP-pH
ORP
ORP ORP
: ORP
, m
ORP Oxidation-Reduction Potential ;
aging
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; Okouchi ., ; Ohnami ;
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Fig. a Locations of wellheads and communal bathhouses in Nozawa spa area.
Fig. b Appearances of communal bathhouses in Nozawa spa area.
67
Fig. a
Fig. b
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b
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�Fig. ORP-pH relationships of hot spring waters fresh
out of wellheads and those at bathtubs of commu-
nal bathhouses.
68
Ooyu
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g kg
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Figure ORP-pH Fig.
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; Okouchi
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Fig. ORP-pH relationships of skins on flexural sides
of forearms measured before and immediately after
bathing in hot spring water (kawarayu).
, : Before and after bathing in hot spring water
( : Kawarayu), respectively.
, :
( ), respectively.
Fig. ORP-pH relationships of skins on flexural sides
of forearms measured in experimental daily bathing
over two months.
69
: :
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;
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flexural sides of forearms in experimental daily
bathing.
Fig. Changes in viscoelastic modulus of skins on
backs of hands in experimental daily bathing.
70
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Changes in viscoelastic modulus of skins on flex-
ural sides of forearms classified by age bracket.
Fig.
Fig. Changes in viscoelastic modulus of skins
on backs of hands classified by age bracket.
71
Fig.
ORP
Fig.
Shirota ;
pH
pH
L-tyrosine
Tyrosinase Fig.
DOPAchrome nm
Shirota ;
Fig.
Figure nm pH
C
Figure
Fig.
et. al.,
et. al.,
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Fig. Melanin formation mechanism.
Fig. Chromatic change of aqueous solution with time in melanin formation reaction.
72
m m
atm Figure
ORP-pH
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: Purified water. : Water sample from Nozawa spa. : Ascorbic acid
aqueous solution.
Fig. Chromatic change with time of water samples from Nozawa spa and ascorbic
acid aqueous solution in melanin formation reaction.
73
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74
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Fig. Variations in ORP-pH in film permeation experi-
ment on ascorbic acid aqueous solution.
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: Ascorbic acid aqueous solution.
Fig. Influence of aging of Nozawa spa on ORP-pH
relationships
: Nozawa spa. , , : aged Nozawa spa.
: purified water
75
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an intermediate of melanin formation reac-
tion during the aging of Nozawa spa.
: Purified water (pH ). , , , :
Hot spring water samples (Nozawa spa) as
shown in Fig. .
76
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H S
: .
: pp.
Aileem Tamura,
: ORP Oxi-
dation-Reduction Potential pH .
:
.
:
.
a : ORP
.
b :
.
:
ORP pH .
: ORP pH
.
Ohnami, S., Koumura, K., Ikeda, S. and Okouchi, S. ( ) : ORP (oxidation-reduction potential)
pH relationship between hot spring waters and human body fluids. Proceedings of the
th Conference of Societe Internationale des Techniques Hydrothermales (Beppu, Ohita,
Japan), .
Okouchi, S., Suzuki, M., Sugano, K., Kagamimori, S. and Ikeda, S. ( ) : Water desirable for
nm
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the human body in terms of oxidation-reduction potential (ORP) to pH relationship. J.
Food Sci., , .
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: Bio Indusutry, .
Shirota, S., Miyazaki, K., Aiyama, R., Ichioka, M. and Yokokura, T. ( ) : Tyrosinase Inhibi-
tors from Crude Drugs. Biol. Pharm. Bull., , .
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