Recent in Chemistry (page 7 of 9)

Comparatively Speaking: Solubility vs. Extraction

In this installment of "Comparatively Speaking," industry expert Tony O'Lenick describes the difference between solubility and extraction, and how various extraction techniques can be used to isolate desired cosmetic actives.

Comparatively Speaking: Solubility vs. Partition Coefficient

Here, industry expert Tony O'Lenick explains the difference between solubility and partition coefficient, as the understanding can lead to a better delivery of a formulation's materials.

Nanotechnology in Cosmetics: A Review

As the commercial applications of nanotechnology have increased in the past decade, a number of nanoparticles are now being used in cosmetic products with optimized sensory attributes and consumer-perceivable benefits. This article reviews various forms of nanoparticles used in the cosmetic industry, discussing their properties, interactions with the skin and potential health effects.

Silicone Safety and the Cosmetic Industry

The use of silicones in personal care products continues to expand because of the unique performance attributes they provide and their well-established record of safety. As a result, progressively larger volumes of silicones are being released to the environment, and interest in their life cycle has increased. The present article summarizes relevant fundamental chemical and physical properties of silicones and how these relate to material performance, safety and environmental fate.

Comparatively Speaking Compound vs. Composition

Here, industry expert Tony O'Lenick explains the difference between a compound and a composition, as understanding their differences can lead to better formulation.

Improving the Solubility of Benzoyl Peroxide: A Review

In this review, the authors examine studies relating to the solubility of BPO. The clinical trials discussed show that compared with suspended BPO, BPO solubilized by dimethyl isosorbide reduced P. acnes and decreased both inflammatory lesions/irritation and the emergence of antibiotic-resistant P. acnes strains. This reveals the importance of solubilizing BPO for improved efficacy and safety.

Comparatively Speaking: Natural vs. Oxo vs. Ziegler Alcohols

Industry expert Tony O'Lenick explains the differences between natural, oxo and ziegler alcohols to help the formulator better understand the source of their raw materials.

Comparatively Speaking—Entanglement vs. Overlap

This edition of "Comparatively Speaking" describes the difference between the critical molecular weight of entanglement and critical concentration of overlap. These concepts are important for formulators to grasp since they deal with altering the physical properties of a finished product.

Comparatively Speaking: Hysteresis vs. Syneresis

Industry expert Tony O'Lenick defers to his son Thomas O'Lenick, technical director at SurfaTech Corp., to explain the difference between hysteresis and syneresis, as they can affect the aesthetics and physical properties of a formulation.

Comparatively Speaking: Wetting/Eye Irritation in Trisiloxane vs. Dimethicone Copolyol

In a previous "Comparatively Speaking" column, Tony O'Lenick explained the differences between trisiloxane and dimethicone copolyol in terms of surface tension. Here he explains the differences in terms of wetting and eye irritation.

Comparatively Speaking: Essential Fatty Acid vs. Trans Fatty Acid

Tony O'Lenick explains the difference between essential fatty acids, which occur in nature, and trans fatty acids, which are synthesized. In addition, while essential fatty acids are often found in skin care, trans fatty acids are not.

Comparatively Speaking: Liquid, Soft and Dry Extracts vs. Tinctures

In the following excerpt, Tony O'Lenick looks to Tony Dweck to explain the difference between liquid, soft and dry extracts and tinctures.

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