Coffee beans contain oil with health benefits from fatty acids. The unprocessed and processed coffee beans are mostly identical in coffee oil quality and are substantively supplied for certain industries. However, the cost-effective valorization of specialty ingredients from spent coffee grounds for cosmetics is sparely presented. Linoleic acid-rich spent coffee oil, as a specialty material for skin lightening and antiaging cosmetics, is objectively to be presented. Spent coffee oils were prepared by different methods. The most cost-effective material with a high extraction yield, linoleic acid content and unsaturated/saturated fatty acid (UFA/SFA) ratio (13.21 ± 0.25, 32.09% and 0.97) was modified. The modified oil was boosted in linoleic acid (77.20% or 140.57% improvement) and the UFA/SFA ratio (33.12). The physicochemical properties of the oil were applicable for cosmetics as per its safety profiles in B16F10 melanoma and normal human skin fibroblast cells. The oil significantly better inhibited cellular melanogenesis than kojic and linoleic acids (p < 0.01), with prominent tyrosinase and TRP-2 inhibitions. The cellular antioxidant activity of the oil was comparable to those of ascorbic and linoleic acids. The collagen stimulating efficacy of the oil was significantly better than that of ascorbic but comparable to that of linoleic acid as indicated by the MMP-2 inhibitory activities (p < 0.01 and p < 0.001, respectively). The oil is a specialty material for skin brightening and skin wrinkle reduction/skin elasticity improvement products. A successive circular bioeconomy of spent coffee ground waste in a more profitable cosmetic industry is indicated.

中文翻译：

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废咖啡渣作为治疗皮肤暗沉和老化的特殊材料的价值

咖啡豆含有油，脂肪酸对健康有益。未加工和加工过的咖啡豆的咖啡油质量大多相同，实质上供应给某些行业。然而，从废咖啡渣中提取用于化妆品的特殊成分的成本效益评估却很少被提及。富含亚油酸的废咖啡油作为美白抗衰老化妆品的特种原料，客观呈现。用过的咖啡油是通过不同的方法制备的。对具有高提取率、亚油酸含量和不饱和/饱和脂肪酸 (UFA/SFA) 比率 (13.21 ± 0.25, 32.09% 和 0.97) 的最具成本效益的材料进行了修改。改性油在亚油酸（77.20% 或 140.57% 改进）和 UFA/SFA 比率（33.12）中得到提高。根据其在 B16F10 黑色素瘤和正常人皮肤成纤维细胞中的安全性，该油的理化特性适用于化妆品。与曲酸和亚油酸相比，该油显着更好地抑制细胞黑色素生成（p < 0.01），具有显着的酪氨酸酶和 TRP-2 抑制作用。该油的细胞抗氧化活性与抗坏血酸和亚油酸的抗氧化活性相当。该油的胶原刺激功效显着优于抗坏血酸，但与亚油酸相当，如 MMP-2 抑制活性所示（分别为 p < 0.01 和 p < 0.001）。该油是用于皮肤增白和皮肤皱纹减少/皮肤弹性改善产品的特殊材料。