Recent in Chemistry (page 9 of 19)

Comparatively Speaking: Dimethicone vs. Methicone

Dimethicone refers to a silicone compound that has “D” units, meaning only silicon atoms with two methyl groups attached. A methicone completely lacks the “D” unit.

Is Cosmetic Science Really "Bad?"

If one were to believe the opinion of science writer Ben Goldacre, PhD, in his new book titled Bad Science, cosmetic scientists seem to be telling a big bunch of lies. Who has had enough of the public's opinion of cosmetic science?

Buckywires on Industrial Scale: New Delivery Potential

Essentially, buckywires are applicable in place of traditional carbon nanotubes; they are of interest in drug delivery, among other areas, and until now, their industrial scale-up was not determined.

Comparatively Speaking: Complex Esters from Neopentyl Glycol vs. Trimethylol Propane vs. Pentaerythritol

Complex esters are an important class of compounds in the personal care market. These include fatty derivatives if neopentyl glycol, trimethylol propane and pentaerythritol.

Comparatively Speaking: Refractive Index vs. Optical Rotation

The refractive index, or index of refraction of a medium, is a measure by how much the speed of light is reduced when it travels within specific solvents. The speed of light traveling through a vacuum is defined as 1.000.

Comparatively Speaking: Sterol vs. Stearyl

Many terms used in personal care formulating sound and look alike yet have vastly different meanings. This primer for novice chemists examines the terms sterol and stearyl.

Online Research Directory

The Internet is a rich source of information; however, with such breadth of ever-changing content, it can be challenging to search and find relevant information quickly. Thus, Cosmetics & Toiletries magazine has compiled this Online Research Directory to make researching online easier. This directory, while not exhaustive, puts a significant number of resources related to cosmetics R&D at your fingertips, including associations, organizations, government agencies, regulatory bodies, certification groups and universities. This list will continually evolve as new sources emerge.

Comparatively Speaking: The Meaning of Subscripts

In this look at chemical structures, Tony O'Lenick reviews the meaning of subscripts in the context of polymers.

Comparatively Speaking: Molecular Notation of Compounds vs. Compositions

In this look at representative chemical structures, Tony O'Lenick compares the structural notation of molecules present in sodium chloride with those present in sodium polymethacrylate.

Comparatively Speaking: Number of Molecules in Compounds vs. Compositions

In this basic look at representative chemical structures, Tony O'Lenick compares the number of molecules in sodium chloride with sodium polymethacrylate. Future features will discuss differences in their distribution as well as the accuracy of the structures themselves.

Developments in Ceramide Identification, Synthesis, Function and Nomenclature

Advances have been made in recent years to better understand ceramides, as the authors describe here. However, since not all ceramides have the same structure, the nomenclature in the literature and on product labels needs clarification. The Personal Care Products Council recently agreed upon new nomenclature based on four molecular structures, which the authors also discuss.

Comparatively Speaking: Esters vs. Lactones

Industry expert Tony O'Lenick asks Mark Garrison of Avon to explain the difference between esters and lactones, such as lactones being esters in a ring formation.

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