From Pseudoceramides and Multilamellar Emulsions to N-Palmitoyl Serinol and Advanced Skincare Applications
The development of advanced skincare formulations has increasingly relied on research into the molecular structure and biological functions of the skin barrier. Investigations into ceramides, synthetic pseudoceramides, and multilamellar lipid systems have contributed to the development of topical formulations designed to reproduce selected characteristics of the skin’s natural lipid organization. Further research into N-palmitoyl serinol and advanced lamellar technologies has expanded this field, connecting lipid chemistry with epidermal biology and cosmetic formulation science.
Through the development activities associated with Dr. Raymond Lab, this research direction has been translated into formulation technologies and skincare applications, including Crystal Lamella MES® and the Curecode® product range.
Early Research into Pseudoceramides and Multilamellar Emulsions
The stratum corneum, the outermost layer of human skin, serves as the principal permeability barrier. Its structure consists of corneocytes embedded in an extracellular lipid matrix composed primarily of ceramides, cholesterol, and free fatty acids. The organization of these lipids contributes to skin hydration and helps regulate transepidermal water loss.
Research into this structure encouraged scientists to investigate synthetic pseudoceramides, compounds designed to reproduce selected physicochemical characteristics of naturally occurring ceramides. These compounds became important components in research involving artificial skin-barrier lipid systems.
In 1993, Suzuki and colleagues published research examining multilamellar emulsions composed of artificial stratum-corneum lipids containing synthetic pseudoceramides. The study investigated how these components formed organized lipid layers and explored their potential application to dry, scaly skin.
Subsequent developments included proprietary multilamellar formulation technologies, particularly NeoPharm’s MLE® (Multi-Lamellar Emulsion) technology. Research published in the Journal of Investigative Dermatology in 2003 by Park and colleagues examined pseudoceramide-containing multilamellar systems using X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. The study identified organized lamellar structures and investigated their molecular packing characteristics.
These investigations contributed to the scientific understanding of how synthetic lipid composition and molecular self-assembly influence the architecture of topical formulations.
N-Palmitoyl Serinol: Expanding Lipid Research
An additional development in this field involved N-palmitoyl serinol, also known as palmitoyl serinol or Neuromide®. It is an N-acyl serinol compound consisting of a palmitoyl fatty-acyl chain attached to a serinol backbone. Its molecular formula is C19H39NO3, and it is registered under CAS Number 126127-31-9 and FDA Unique Ingredient Identifier Z0RQQ7PY44.
Scientific interest in the compound was initially developed through research into ceramide-related biological activity. In 2000, Bieberich, Kawaguchi, and Yu investigated N-palmitoylated serinol as a ceramide mimic in neuroblastoma cells. Their findings indicated increased endogenous ceramide levels and apoptosis under the experimental conditions, with involvement of protein kinase C zeta (PKCζ).
Research subsequently expanded into N-acyl amides and microbiome-associated signaling. In 2017, Cohen and colleagues reported in Nature that certain human commensal bacteria produce N-acyl amides capable of interacting with mammalian G-protein-coupled receptors. This research established a broader scientific context for understanding lipid-related molecular communication between microorganisms and their hosts.
Further investigations explored N-palmitoyl serinol in epidermal biology. A 2021 study by Shin and colleagues examined the compound in IL-4-treated keratinocytes and reported increased production of total and very-long-chain ceramides. The researchers also investigated cannabinoid receptor type 1 (CB1)-dependent mechanisms and enzymes associated with ceramide synthesis, including CerS2 and CerS3.
These findings provided experimental evidence connecting N-palmitoyl serinol with ceramide metabolism in cultured skin cells, expanding interest in its potential relevance to skin-barrier applications.
Crystal Lamella MES®: Advanced Lamellar Formulation Technology
Research into lipid organization and skin-barrier biology has also encouraged the development of advanced lamellar formulation systems.
Crystal Lamella MES® represents a formulation approach investigated in connection with N-palmitoyl serinol (Neuromide®). It incorporates principles of lipid self-assembly, through which amphiphilic molecules organize into alternating hydrophilic and lipophilic layers.
A 2019 study published in Cosmetics examined an N-palmitoyl serinol-containing Crystal Lamella MES formulation. The researchers used cross-polarized microscopy and wide-angle X-ray diffraction to investigate its structural organization. Their observations indicated optical anisotropy associated with concentric lamellar structures and diffraction patterns interpreted as corresponding to hexagonal and orthorhombic lipid packing.
The study also included a small evaluation involving healthy volunteers. Compared with a commercially available gel-structured emulsion, the test formulation demonstrated increased skin hydration measured through surface capacitance. However, transepidermal water loss did not show significant changes.
The findings provided preliminary evidence concerning the formulation’s physical structure and hydration performance, contributing to research into advanced lipid-based skincare systems.
Translating Research into Skincare Applications
The progression from pseudoceramides and multilamellar emulsions to N-palmitoyl serinol and Crystal Lamella MES® reflects the broader development of research-driven cosmetic formulation.
This approach connects three areas of investigation: the molecular composition of the skin barrier, the biological activity of specialized lipid compounds, and the physical organization of topical formulations.
Through the activities associated with Dr. Raymond Lab, these research directions have been connected with skincare development, including the Curecode® product range. The application of specialized lipid ingredients and advanced formulation principles represents an effort to translate scientific understanding into practical cosmetic products.
The commercial development of such formulations involves ingredient identification, compatibility testing, structural characterization, and evaluation of product performance. These stages help establish the technical basis for incorporating research-derived ingredients into finished skincare applications.
N-palmitoyl serinol is also listed in the Korean Cosmetic Association’s ingredient database under the name N-Palmitoyl Serinol, with a skin-protecting function. Additionally, Neuromide is associated with FDA Drug Master File No. 035139, Type IV, held by Dr. Raymond Laboratories Inc. These records provide regulatory and technical documentation but do not constitute FDA approval or endorsement of a particular cosmetic or therapeutic claim.
Continuing Developments in Skin-Barrier Formulation Science
The evolution of multilamellar formulations and specialized lipid ingredients illustrates the growing relationship between molecular biology, material science, and cosmetic technology.
Early pseudoceramide research established a foundation for investigating artificial skin-barrier lipid systems. Subsequent MLE® developments advanced the characterization of multilamellar structures, while research into N-palmitoyl serinol expanded investigations into ceramide metabolism and lipid-mediated signaling.
The development of Crystal Lamella MES® and its association with skincare applications such as Curecode® represent further steps in translating these scientific concepts into formulation technology.
Together, these developments demonstrate how research into the skin’s natural lipid organization can inform the design of advanced topical formulations, connecting laboratory investigations with the continuing development of specialized skincare products.
Disclaimer: This article is for informational and educational purposes only and should not be considered medical advice. The information presented is based on available research and does not guarantee specific results or outcomes. Individual experiences may vary. Readers are encouraged to consult a qualified healthcare professional before making decisions related to their health or skincare needs.
