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Monday, May 26, 2014

Free radical scavengers Vitamin C and Skin Lightening (Whitening)

Posted by Chantel Martiromo  

Human skin pigmentation is the result of natural selection evolved to prevent damage to skin through regulation of ultraviolet radiated penetration depending to the production of melanin in the skin cells.
1. Hypo-pigment
a. Vitiligo is defined as a condition of destruction of cells that give your skin its color, causing white patches on your skin.
b. Albinism is a congenital disorder causes of complete or partial absence of pigment in the skin, hair and eyes as a result of restriction of the skin cells from producing melanin
2.Hyper pigment is a result of over production of pigments of certain cells in the skin, causing skin darkening in some area, such as tan or brown patches, commonly on the facial skin
3. Skin discoloring is a result of discoloring your skin in specific spots or very widespread
4. Chloasma is the appearance of brown patches of pigmentation on the forehead, cheeks, and neck
due to hormonal change during pregnancy.
5. Melasma happens to women who have fluctuation of hormones, are taking birth control pills and certain medications. with brownish-grayish patches on the skin, most often on the cheek.

 Free radical scavengers Vitamin C
Suggestions of antioxidants, may be next potential agent in inhibition of tyrosinase activity and reduction of the melanin content in cells(22)(22a)
 Vitamin C Vitamin C also known as L-ascorbic acid, is a water-soluble vitamin, found in fresh fruits, berries and green vegetables. It is best known for its free radical scavengers activity and regenerating oxidized vitamin E for immune support.
Ascorbic acid (AA) has been well known as a skin whitening agent, according to the Mahidol University, AA showed to inhibit UVA-mediated catalase (CAT) inactivation, glutathione (GSH) depletion, oxidant formation and NO production through suppression of eNOS and iNOS mRNA via its antioxidant defense(23). In the comparison of orchid extracts and 3% vitamin C derivative formulated, researchers at the Osaka National Hospital, National Hospital Organizationfound that the orchid-rich plant extracts possess efficacy similar to vitamin C derivative in whitening the skin as well as melasma and lentigo senilis on the face of Japanese women(24). Other study suggested that topical application of the composition of L(+) lactic acid supplemented with ascorbic acid (1%) produced a whitening effect and a modest preferential lightening of age spots which becomes apparent after three months, through demonstrated clinically by the test panelists, and trained clinicians, and with objective instrumental methods(25).
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References
(a) Tyrosinase modulation by five Rwandese herbal medicines traditionally used for skin treatment by Kamagaju L1, Morandini R, Bizuru E, Nyetera P, Nduwayezu JB, Stévigny C, Ghanem G, Duez P.(PubMed)
(b) An ethnobotanical survey of medicinal plants used in Rwanda for voluntary depigmentation by Kamagaju L1, Bizuru E, Minani V, Morandini R, Stévigny C, Ghanem G, Duez P.(PubMed)
(c) Tyrosinase inhibition by extracts and constituents of Sideroxylon inerme L. stem bark, used in South Africa for skin lightening by Momtaz S1, Mapunya BM, Houghton PJ, Edgerly C, Hussein A, Naidoo S, Lall N.(PubMed))
 


(22) Biofunctional Constituents from Liriodendron tulipifera with Antioxidants and Anti-Melanogenic Properties by Li WJ1, Lin YC, Wu PF, Wen ZH, Liu PL, Chen CY, Wang HM.(PubMed)
(22a) The effects of areca catechu L extract on anti-inflammation and anti-melanogenesis by Lee KK1, Choi JD.(PubMed)
(23) Inhibition of UVA-mediated melanogenesis by ascorbic acid through modulation of antioxidant defense and nitric oxide system by Panich U1, Tangsupa-a-nan V, Onkoksoong T, Kongtaphan K, Kasetsinsombat K, Akarasereenont P, Wongkajornsilp A.(PubMed)
(24) \Whitening efficacy of plant extracts including orchid extracts on Japanese female skin with melasma and lentigo senilis by Tadokoro T1, Bonté F, Archambault JC, Cauchard JH, Neveu M, Ozawa K, Noguchi F, Ikeda A, Nagamatsu M, Shinn S.(PubMed)
(25) The effects of topical l(+) lactic Acid and ascorbic Acid on skin whitening by Smith WP.(PubMed)

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