posted on 2021-01-15, 16:33authored byJie Tang, Hailun He, Ruoyu Wan, Qi Yang, Heng Luo, Li Li, Lidan Xiong
Most of the foundation
liquids in the market need makeup removers
for cleaning, while the excessive use of makeup removers might lead
to skin barrier damage, which would further lead to many kinds of
dermatosis, such as skin sensitivity, facial telangiectasia, rosacea,
acne, as well as various cosmetic contact dermatitis. Inspired by
the protective effect of fiber-rich diet on the intestinal mucosal
mechanical barrier, a novel hemp/cellulose nanocrystals (CNCs)-based
foundation liquid featuring easy-wiping property has been constructed,
which will effectively solve the post-makeup skin cleaning problems.
In this experiment, the formula of the foundation liquid can be obtained
through hemp/CNCs instead of mineral oil and titanium oxide, which
are considered to have undesirable local tolerance, sensitizing potential,
and are environmental pollutants, to create a moisture barrier. Industrial
hemp is a hot issue in cosmetic research, and a great quantity of
discarded industrial hemp stalk is available to be used to produce
hemp/CNCs through grinding and acidification. The graft technique
is adapted to obtain hemp/CNCs-g-polylactic acid
(PLA). By replacing the hydroxyl group on the side of hemp/CNCs, hemp/CNCs-g-PLA reduces the intermolecular hydrogen bonding, resulting
in a higher dispersion in the oil phase. The hemp/CNCs-g-PLA has excellent performance in terms of biological compatibility,
water resistance, and non-penetration into the skin. With basic features
of a foundation liquid to alleviate discoloration, age spots, and
skin roughness, the foundation liquid based on hemp/CNCs-g-PLA provides a novel characteristic of easy-wiping, which helps
to avoid the damage to the skin barrier caused by excessive cleansing.