中川典昭
菅原智孑
酒井進吾
株式会社佳丽宝化妆品
价值创成研究所
[摘要]天然保湿因子(NMF)在保持角质层(SC)物理性质方面,起着举足轻重的作用。但是,目前鲜有对NMF对SC物理性质特殊影响的研究,较多的是对氨基酸的研究。本文主要关注健康受试者离子含量和SC物理性质之间的关系。研究证明,只有乳酸和钾是与SC含水量和硬度有关,而且SC中乳酸和钾的含量也有关。此外,乳酸钾作为一种NMF比乳酸钠更能提高SC的保湿程度。特应性皮炎患者皮肤较干燥,与健康受试者相比,乳酸钾含量较低。有趣的是,本研究通过使用不同的扫描量热法和衰减全反射红外光谱法,证明了乳酸钾能提高SC的含水量,SC角蛋白丝氨酸残留物中的OH基亲水性比乳酸钠更好。这些结果说明,NMF作为乳酸盐对SC物理性质的维护起着至关重要的作用,而且乳酸钠能通过促进水分子和SC角蛋白丝氨酸OH基进行相互作用,提高SC的锁水能力。
[关键词]天然保湿因子;乳酸钾;角质层;水分保持能力;角蛋白;丝氨酸残基
Potassium lactate as natural moisturizing factor-Role for the water holding capacity of stratum corneum-
Noriaki NakagawaTomoko SugawaraShingo Sakai
Innovative Beauty Science Laboratory, Kanebo Cosmetics Inc
Abstract: Natural moisturizing factors (NMFs) play an important role for maintaining the physical properties of the stratum corneum (SC). However, few studies have investigated the specific influences of NMF components other than the amino acids. In this study, we focus on the relationship between the ion content and the SC physical properties in healthy subjects. We demonstrated that lactate and potassium were the only components found to correlate with the water content and stiffness in the SC, and that the levels of lactate and potassium in the SC were also correlated. Moreover, potassium lactate as an NMF increased SC water content more than sodium lactate did. In patients with atopic dermatitis displaying dry skin symptom, the levels of potassium lactate was decreased compared with healthy subjects. Interestingly, potassium lactate increased the bound water content of the SC and the accessibility of water molecules to the OH group of the serine residue in the
SC keratin more than sodium lactate. These results suggest that potassium lactate as an NMF plays an important role for maintaining the SC physical properties, and that potassium lactate increases the water holding capacity of the SC by increasing interaction between water molecules and the OH
group of serine in SC keratin.
Key words: water holding capacity; stratum comeum; potassium lactate; serine residue of keratin
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