Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Acidity of 1-Alkynes

Acidity of 1-Alkynes

The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same authorSame journal

Safety Assessment of <i>Melaleuca alternifolia</i> (Tea Tree)-Derived Ingredients as Used in Cosmetics.

International journal of toxicology·2026

Same authorSame journal

Safety Assessment of Radish Root - Derived Ingredients as Used in Cosmetics.

International journal of toxicology·2026

Same authorSame journal

Amended Safety Assessment of Naturally-Sourced Clays as Used in Cosmetics.

International journal of toxicology·2026

Same author

Safety Assessment of Diatomaceous Earth as Used in Cosmetics.

International journal of toxicology·2026

Same author

Safety Assessment of Basic Yellow 87 as Used in Cosmetics.

International journal of toxicology·2026

Same author

Safety Assessment of Glycolactones as Used in Cosmetics.

International journal of toxicology·2026

Same journal

Aldose Reductase Inhibitor, Epalrestat, Suppresses Colorectal Cancer Cell Proliferation Through Complement-Dependent Cytotoxicity.

International journal of toxicology·2026

Same journal

Nonclinical Safety Profiles of mRNA Therapeutics Comprising Unmodified or N1-Methyl-Pseudouridine-Modified Nucleosides Are Similar Following Repeated Administration.

International journal of toxicology·2026

Same journal

Evaluation of the <i>in vitro</i> Toxicity of Novel Oxime Acetylcholinesterase Reactivators.

International journal of toxicology·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Jun 28, 2025

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Published on: November 10, 2017

Laneth Acetates.

Priya Cherian¹, Wilma F Bergfeld², Donald V Belsito²

¹Cosmetic Ingredient Review Senior Scientific Analyst/Writer.

International Journal of Toxicology

|April 23, 2024

Summary

This summary is machine-generated.

The Expert Panel for Cosmetic Ingredient Safety confirmed Laneth-9 Acetate and Laneth-10 Acetate are safe for topical use. This conclusion is based on recent studies and current product concentrations, ensuring consumer safety in cosmetic applications.

Keywords:

Cosmetic Ingredient Review Cosmetics Expert Panel for Cosmetic Ingredient Safety Laneth-10 Laneth-9 Safety

More Related Videos

Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes

Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes

Published on: July 28, 2018

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Published on: October 27, 2018

Related Experiment Videos

Last Updated: Jun 28, 2025

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Published on: November 10, 2017

Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes

Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes

Published on: July 28, 2018

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Published on: October 27, 2018

Area of Science:

Cosmetic Science
Dermatology
Toxicology

Background:

The Expert Panel for Cosmetic Ingredient Safety previously assessed Laneth-9 Acetate and Laneth-10 Acetate in 1982 and 2002.
Updated scientific literature and product usage information have become available since the last review.

Purpose of the Study:

To re-evaluate the safety of Laneth-9 Acetate and Laneth-10 Acetate.
To consider newly available studies and current cosmetic product formulations.

Main Methods:

Comprehensive review of newly available scientific studies.
Analysis of updated information on cosmetic product types and ingredient concentrations.
Expert panel assessment based on the gathered evidence.

Main Results:

The review encompassed studies published since the original 1982 assessment and the 2002 re-review.
Consideration of current practices in cosmetic product formulation and ingredient usage levels.

Conclusions:

Laneth-9 Acetate and Laneth-10 Acetate are confirmed safe for topical application in humans.
Safety is assured under the present practices of use and concentration as detailed in the report.