Supramolecular gels based on hierarchically self-assembly of small organic molecules through non-covalent interactions attract more and more attention because of the potential applications. Expected design of gelators that could directly self-assembly into fiber network instead of serendipity is challenging for both molecular recognition and supramolecular self-assembly. Pentacyclic triterpenoids with unique chiral skeleton structures are very important active biomolecules as natural products. They have much medicinal value because of their biological activities such as liver-protecting,anti-hyperlipidemia, anti-tumor, anti-virus and anti-inflammatory. Due to the characteristics of rigid chiral skeleton and multiple reaction sites, the aggregation and self-assembly properties of pentacyclic triterpenoids have attracted more and more attention. In this review, the aggregation property of pentacyclic triterpenoids without any modification in different solvents and supramolecular gels formed by functional molecules based on derivatives of triterpenoids are described in detail. In addition, the potential applications of the gels based on pentacyclic triterpenoids are also represented. Imitating and modifying these natural products used as building blocks in self-assembling architectures can not only minimize the tedious synthetic work of gelators and introduce ready units for supramolecular gels, but also help to elaborate the interactions between biomolecules and make use of natural products to create new materials.

Contents
1 Introduction
2 Supramolecular gels based on pentacyclic triterpenoids without modification
2.1 Supramolecular gels based on lupane-triterpenoid
2.2 Supramolecular gels based on oleanane-triterpenoid
3 Supramolecular gels based on pentacyclic triterpenoid derivatives
3.1 Gelators of pentacyclic triterpenoid derivatives start from carboxyl
3.2 Gelators of pentacyclic triterpenoid derivatives start from hydroxyl
4 Conclusion and outlook