Overview
Sebum is a lipid-rich secretion produced by sebaceous glands, which are microscopic exocrine glands found in hair follicles. It consists of triglycerides (≈41%), wax esters (≈26%), squalene (≈12%), and free fatty acids (≈16%). This complex mixture forms the skin's natural barrier, preventing transepidermal water loss and defending against pathogens. Production is hormonally regulated, primarily by androgens, with secretion rates peaking during adolescence. Sebum output varies by body region (highest on the face and scalp) and individual genetics. Its composition differs from other bodily lipids, featuring unique components like squalene not found in cell membranes.
Physical and Chemical Properties
As a biological lipid mixture, sebum exhibits temperature-dependent viscosity, becoming more fluid at skin surface temperature (≈32°C). Its refractive index ranges from 1.47 to 1.50, contributing to skin's optical properties. The pH is slightly acidic (4.5–6.0), aiding microbial defense. Key chemical reactions include lipase-mediated breakdown of triglycerides into free fatty acids by skin bacteria (e.g., Cutibacterium acnes). These fatty acids exhibit antimicrobial activity but may trigger inflammation when overproduced. Sebum oxidizes upon air exposure, with squalene particularly prone to forming comedogenic peroxides.
Main Applications
In dermatology, sebum analysis helps diagnose disorders like seborrhea (excess production) or asteatosis (deficiency). Cosmetic formulations often mimic its composition, using ingredients like jojoba oil (wax ester substitute) or synthetic squalane for moisturizers. Biotechnology applications include studying sebum biomarkers for hormonal disorders. In forensic science, sebum fingerprints provide additional identification data. The personal care industry monitors sebum levels to develop targeted products, from oil-control cleansers to lipid-replenishing creams for dry skin conditions.
Safety and Storage
As an endogenous substance, sebum is generally non-irritating. However, altered composition or excessive production correlates with acne vulgaris. Industrial handling of sebum-derived materials (e.g., lanolin) requires standard lipid safety protocols—avoiding ignition sources due to combustibility. For research samples, storage at -20°C under nitrogen atmosphere prevents oxidation. Synthetic sebum analogs for product testing typically contain triglycerides, wax esters, squalene, and cholesterol in physiological ratios, requiring airtight containers away from light.
B2B Procurement Guide
Pure human sebum isn't commercially available, but alternatives include: 1. Synthetic sebum (e.g., ISO 18672 standard mix for cosmetic testing) 2. Plant-derived substitutes (jojoba esters, squalane from sugarcane) 3. Lanolin (wool wax with similar emollient properties) Key procurement criteria: Oxidative stability (measured by peroxide value), fatty acid profile matching human sebum, and absence of comedogenic components. For acne research, pre-oxidized sebum formulations simulate pore-clogging effects. Bulk pricing for synthetic analogs ranges ≈$50–$200/kg depending on purity.
Related Manufacturers
- 主营：改性塑胶、高韧塑胶、塑胶原料颗粒、抗弯曲塑胶原料
- 主营：丁香油、水精油、中药油、茴香油、香叶油、香精油、桉叶素、能量油、桉叶油、洋甘菊、茶树油、皮傲宁、乙基醚、基础油、抗菌剂、蜂草油、护肤品、己二醇、当归油、鼠尾草、增补剂、玉米油、丝柏油、香薰油、提取液
- 主营：精油、提取液、原料、美白
- 主营：医药中间体、香精香料、硅烷偶联剂、人工皮脂、氧化石蜡皂、苯乙烯磷酸、苯甲羟肟酸、H205、阻聚剂706、阻聚剂701、萤石矿捕收剂、白钨矿捕收剂、稀土矿捕收剂、氧化锑矿捕收剂、活化剂
- 主营：养生产品加工、化妆品加工、护肤品加工、精华原液加工、化妆品批发、面膜加工、持妆粉底、养生套盒、套盒批发
- 主营：黑棕鹅、新鲜鹅肉
- 主营：仪器仪表、溅射仪、功率计、皮脂厚度计、测量仪、检测仪、分析仪、电导率仪、配件耗材
- 主营：仿生皮脂、化妆品原料、各种表面活性剂、纺织用化学原料
- 主营：肌氨酸钠、硫化锰、V50偶氮二异丁脒盐酸盐、腰果酚缩水甘油醚、乙硫氮、二新癸酸二甲基锡、三硫代碳酸钠、PX-4MP、芥酸PKO、四氧化三锰
- 主营：自动颗粒强度测定仪、冷原子吸收测汞仪、海水比色计、皮脂厚度计、匀胶机、油料电导率仪
- 主营：彩超机、兽用b超机、超声b超机、兽用超声机、便携式超声机
- 主营：黑棕鹅
- 主营：聚维酮、吗啉、乙二醇丁醚、皮脂酸、聚乙烯吡咯烷酮、甲基异丙基酮、甲基吡咯烷酮、三乙醇胺硼酸酯、甲基叔丁基醚、正戊烷、三元酸、邻氯苯甲酰氯、司盘、吐温、松节油、环氧树脂、苯甲醇、二异丁基酮、二甲基乙酰胺、乙烯基吡咯烷酮
- 主营：测试仪、密封圈、过滤器、皮脂贴片S100、电磁阀、点焊机、整流桥、可控硅、制动器、编码器、电位计、冷却器、电烙铁、鞘液10桶、汽车底盘、振动电机、浮球开关、微动开关、钥匙开关、行程开关、接近开关、限位开关、轴流风机、e62.f10-102b20、光电传感器、介子机主板
- 主营：可控硅、限位开关、行程开关、压力开关
- 主营：棕榈酸、乙酸铋、异喹啉、胶粘剂、丙烯酸酯、化学试剂、分析试剂、透明液体、二乙二醇、光引发剂、岩白菜素、对甲苯磺酸、苯甲酸苄酯、偏苯三酸酐、六氟异丙醇、纳米氧化铽、六氟磷酸铯、表面活性剂、蓖麻醇酸锌、乙基纤维素、荧光指示剂、2-乙二硫醇、4-二氟苄溴|、丙烯酸羟乙酯、3-丙烷磺内酯