{"id":14454,"date":"2025-03-04T15:20:51","date_gmt":"2025-03-04T09:50:51","guid":{"rendered":"https:\/\/businessprojects.in\/nichem\/?p=14454"},"modified":"2025-04-02T18:40:40","modified_gmt":"2025-04-02T13:10:40","slug":"essentials-of-a-sunscreen-formulation-in-cosmetics","status":"publish","type":"post","link":"https:\/\/businessprojects.in\/nichem\/essentials-of-a-sunscreen-formulation-in-cosmetics\/","title":{"rendered":"Essentials of a Sunscreen Formulation in Cosmetics"},"content":{"rendered":"\t\t
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Sunscreen, also known as sunblock, sun lotion or sun cream, is a photoprotective topical product for the skin that helps protect against sunburn and prevent skin cancer. Sunscreens are available as lotions, sprays, gels, foam lotions, whipped lotion, sticks, powders and other topical forms. Sunscreens are classified according to the type of active ingredients present in the formulation. These actives are organic or inorganic compounds, also called as UV filters. There are hybrid Sunscreens available which contain a combination of organic and inorganic UV filters.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Understanding SPF<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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SPF is Sun Protection Factor. It is a measure of how much solar energy (UVB rays) is required to produce sunburn on protected skin (with Sunscreen) relative to unprotected skin (without Sunscreen). As the SPF value increases, sunburn protection increases. SPF is calculated as the ratio of UV exposure needed to cause minimal erythema (redness) on protected versus unprotected skin. Higher SPF values indicate greater protection, though no Sunscreen blocks 100% UVB. Broad-spectrum Sunscreens also shield against UVA, preventing deeper skin damage and photoaging. As depicted in Fig 1, the SPF number indicates how much UVB the Sunscreen allows in, not how much it blocks. A Sunscreen with SPF 15 allows one-fifteenth of the sun’s UVB rays to reach your skin, or about 7%. Thus, it filters out about 93% percent of UVB rays while SPF 30 filters about 97%.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Fig 1: SPF number on Sunscreen labels<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Source: https:\/\/www.bbc.com\/news\/health-43966154<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Globally approved actives for SPF\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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In the topical Sunscreen formulations, UV protection is imparted by 2 types of actives as depicted in Fig 2 –<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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  1. Mineral (Inorganic) Actives (also called as Mineral UV filters).<\/strong> These are inorganic compounds which reflect, scatter and absorb UV light. Zinc Oxide and Titanium Dioxide are the most widely used and approved UV filters in Sunscreen formulations.<\/li>\n \t
  2. Chemical (Organic) Actives (also called as Chemical UV filters)<\/strong>. These are organic compounds which absorb UV light. These actives are regulated in USA, EU, Japan and Australia. US-FDA have approved a limited number of Chemical UV filters, namely Octinoxate (Ethylhexyl Methoxycinnamate), Avobenzone (Butyl Methoxydibenzoylmethane), Octocrylene, Oxybenzone (Benzophenone-3), Homosalate, Octisalate (Ethylhexyl Salicylate). EU, Australia, Japan have approved a broader range of filters that offer enhanced photostability and broader spectral coverage. They are Mexoryl SX (Ecamsule), Mexoryl XL (Drometrizole Trisiloxane), Tinosorb S (Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine), Tinosorb M (Methylene Bis-Benzotriazolyl Tetramethylbutylphenol), Uvinul A Plus (Diethylamino Hydroxybenzoyl Hexyl Benzoate), Uvinul T 150 (Ethylhexyl Triazone).<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Fig 2: Types of Sunscreen Agents<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Source: https:\/\/www.researchgate.net\/publication\/336974753_Recent_Trends_of_Sunscreen_Cosmetic_An_Update_Review<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Benefits of Mineral Sunscreens & Chemical Sunscreens<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Mineral Sunscreens offer superior advantages over Chemical Sunscreens as depicted in Table 1 below:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Table 1: Comparative benefits of mineral & chemical sunscreens.<\/p>

    Criteria<\/strong><\/p><\/td>

    Mineral (inorganic) Sunscreens<\/strong><\/p><\/td>

    Chemical (organic) Sunscreens<\/strong><\/p><\/td><\/tr>

    Mechanism of Action<\/strong><\/p><\/td>

    Form a physical barrier that reflects and scatters UV rays<\/p><\/td>

    Absorb UV rays and convert them into heat<\/p><\/td><\/tr>

    Onset of Protection<\/strong><\/p><\/td>

    Work immediately upon application<\/p><\/td>

    Often require 15\u201320 minutes to become fully effective<\/p><\/td><\/tr>

    Skin Sensitivity<\/strong><\/p><\/td>

    Gentler on sensitive or acne-prone skin<\/p><\/td>

    May cause irritation in sensitive skin, though newer formulas improve<\/p><\/td><\/tr>

    Cosmetic Appeal<\/strong><\/p><\/td>

    Can leave a white cast (improved with nano formulations)<\/p><\/td>

    More transparent with a lighter, non-greasy feel<\/p><\/td><\/tr>

    Photostability<\/strong><\/p><\/td>

    Highly stable under sunlight, with minimal degradation<\/p><\/td>

    Some ingredients may degrade under UV exposure unless stabilized<\/p><\/td><\/tr>

    Environmental Impact<\/strong><\/p><\/td>

    Often considered more reef-safe when formulated appropriately<\/p><\/td>

    Some filters (e.g., oxybenzone) have raised environmental concerns<\/p><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    One potential drawback of mineral sunscreens is the white cast they can leave on the skin, especially in higher concentrations. However, advancements in formulation have led to the development of dispersions which are essential for the uniform distribution of the actives, improving stability, reducing whitening and improving overall performance of the Mineral Sunscreens.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Essential factors of an effective Sunscreen \n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    A sunscreen formulation consists of following essential ingredients, namely –<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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