From Structure to Application: An Overview of PAMAM Dendrimers and Aladdin’s Product Portfolio
From Structure to Application: An Overview of PAMAM Dendrimers and Aladdin’s Product Portfolio
Overview of PAMAM Dendrimers
Poly(amidoamine) (PAMAM) dendrimers are a class of highly branched macromolecules featuring well-defined generations and precisely engineered three-dimensional architectures. Their molecular size, internal structural units, and terminal functional groups can all be finely tuned. Owing to these unique structural and physicochemical characteristics, PAMAM dendrimers have been widely employed in drug/gene delivery and sustained-release formulations, in surface and interfacial engineering, and in the adsorption and removal of environmental pollutants, making them a major research focus across multiple interdisciplinary fields.
PAMAM dendrimers generally exhibit excellent water solubility and good processability. Under appropriate conditions, they show favorable biocompatibility and readily form films or coatings, thereby meeting the needs of application-oriented research in a variety of domains.
Typical application areas include:
(1) Pharmaceutical and biomedical applications:
As carriers for drugs, genes, and vaccines to enhance solubility, stability, and targeted delivery efficiency;
(2) Host–guest and supramolecular chemistry:
As multifunctional host scaffolds for constructing host–guest complexes and diverse supramolecular assemblies;
(3) Catalysis:
By introducing metal centers or organocatalytic sites onto the dendritic backbone, they enable highly efficient multi-site or single-site catalytic systems;
(4) Materials self-assembly:
Participating in the construction of liquid crystalline phases, nanofilms, and functional coatings to realize controllable self-assembled structures.
Product Advantages
(a) Greener profile:
When used at appropriate dosages and with suitable surface modifications, PAMAM dendrimers typically exhibit good biocompatibility and offer greater potential for greener applications compared with certain traditional small-molecule organic reagents;
(b) High solubility:
Their dendritic, quasi-spherical architecture and abundant polar functional groups endow them with excellent solubility in a wide range of polar solvents, facilitating formulation and processing;
(c) Ease of film formation:
The highly branched structure disrupts regular intermolecular packing and reduces crystallinity, promoting the formation of uniform, dense films or coatings.
Exemplary PAMAM Structures and Generations (G0/G1/G2 Comparison)
To facilitate understanding of the generational architecture of PAMAM dendrimers, the following table compares three representative generations—G0, G1, and G2—with an ethylenediamine (EDA) core in terms of structural features and selection guidance:
Item | G0 (CAS 155773-72-1) | G1 (CAS 142986-44-5) | G2 (CAS 93376-66-0) |
Core | Ethylenediamine (EDA) | Ethylenediamine (EDA) | Ethylenediamine (EDA) |
Number of internal layers | 1 layer of PAMAM segments | 2 layers of PAMAM segments | 3 layers of PAMAM segments |
Typical schematic | EDA core → four arms of –CONH–(CH₂)₂–NH₂ | Each terminal of G0 branches into two → 8 terminal arms in total | Each terminal arm of G1 branches into two → 16 terminal arms in total |
Terminal groups | 4 × –NH₂ | 8 × –NH₂ | 16 × –NH₂ |
Theoretical Mw* | ~517 | ~1,430 | ~3,256 |
Approximate diameter* | ~1.5 nm | ~2.2 nm | ~2.9 nm |
Property trend | Lowest volume/charge, fastest diffusion, smallest internal cavity | Moderate volume and surface charge | Larger volume and higher surface charge; suitable for more/stronger coordination |
Selection guideline | Small molecular weight and fast diffusion; suitable as a model compound, coordination motif, or small-size modification unit (e.g., short “arms” for gold nanoparticle modification or surface functionalization) | Eight primary amines on the surface provide sufficient but not excessive site density; commonly used as a low-generation model for gene/drug delivery vectors and as a crosslinking/grafting scaffold | Increased size and number of surface amines; suitable as a multi-site modification platform (e.g., multi-ligand covalent conjugation, multi-metal coordination, multi-drug loading) |
*Theoretical molecular weights and particle sizes are representative values from the literature and typical product data sheets. Actual values may vary slightly depending on supplier and measurement conditions and are provided for structural understanding and selection reference only.
Aladdin PAMAM Product Line: Classification and Reference Tables
Based on different core structures (ethylenediamine, 1,4-diaminobutane, and cystamine) and a broad range of generations (full generations and half-generations), Aladdin has established a comprehensive PAMAM dendrimer product portfolio. The following sections classify these products by structural type and summarize representative items together with selection guidance.
I. Ethylenediamine Core · Full-Generation PAMAM (Amine-Terminated Main Series)
Aladdin Cat. No. | Product Name | Structural Generation (Gx.x) | Brief Structural Description | CAS No. | Specification / Purity |
PAMAM dendrimer, ethylenediamine core, generation 0.0 solution | G0.0 | EDA core; 4 × –NH₂ termini; low-generation amine-terminated PAMAM | 155773-72-1 | 20 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 1.0 solution | G1.0 | EDA core; 8 × –NH₂ termini | 142986-44-5 | 20 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 2.0 solution | G2.0 | EDA core; 16 × –NH₂ termini | 93376-66-0 | 20 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 3.0 solution | G3.0 | EDA core; 32 × –NH₂ termini | 153891-46-4 | 20 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 4.0 solution | G4.0 | EDA core; 64 × –NH₂ termini | 163442-67-9 | 10 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 5.0 solution | G5.0 | EDA core; high-generation amine-terminated PAMAM | 163442-68-0 | 5 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 6.0 solution | G6.0 | EDA core; higher-generation amine-terminated PAMAM | 163442-69-1 | 5 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 7.0 solution | G7.0 | EDA core; high density of surface functional sites | 163442-70-4 | 5 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 8.0 solution | G8.0 | EDA core; approaching quasi-spherical nanoscale particles | 163442-71-5 | 5 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 9.0 solution | G9.0 | EDA core; multi-site modification platform | 163442-72-6 | 5 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 10.0 solution | G10.0 | EDA core; ultra-high-generation amine-terminated PAMAM | 163442-73-7 | 5 wt.% in methanol |
Key features of this series:
(1) Core backbone of the product line
Covers generations G0–G10. The dendritic architecture is highly branched, and the number of surface amine groups increases exponentially with generation, making this series well suited for systematic structure–property relationship studies.
(2) Typical application directions
Low generations (G0–G2):
Model compounds and small-size surface modifiers/coordination motifs;
Intermediate generations (G3–G5):
Commonly used as drug/gene delivery vectors, self-assembled films, and crosslinking backbones;
High generations (G6–G10):
Multi-site modification platforms for multi-metal or multi-ligand loading and other high-capacity functionalization strategies.
(3) Significance of concentration specifications
20 wt.%: Suitable for applications requiring concentrated stock solutions with dilution immediately before use;
10 wt.% / 5 wt.%: Lower viscosity and easier pipetting, ideal for small-scale systems and high-generation products where handling convenience is critical.
II. Ethylenediamine Core · Half-Generation PAMAM (Carboxylate/Ester-Terminated Series)
Aladdin Cat. No. | Product Name | Structural Generation (Gx.x) | Brief Structural Description | CAS No. | Specification / Concentration |
PAMAM dendrimer, ethylenediamine core, generation 0 | Structurally close to G0.5 | Low-generation PAMAM with carboxylate/carboxylic acid termini; commonly used as a precursor for G0.5 | 67874-43-5 | — | |
PAMAM dendrimer, ethylenediamine core, 0.5 solution | G0.5 | EDA core, carboxyl/ester-terminated | — | 20 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 1.5 solution | G1.5 | EDA core, carboxyl/ester-terminated | 202009-64-1 | 20 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 2.5 solution | G2.5 | EDA core, carboxyl/ester-terminated | 202009-65-2 | 10 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 3.5 generation solution | G3.5 | EDA core, carboxyl/ester-terminated | 192948-77-9 | 10 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 4.5 solution | G4.5 | EDA core, carboxyl/ester-terminated | 202009-66-3 | 5 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 5.5 solution | G5.5 | EDA core, carboxyl/ester-terminated | 202009-67-4 | 5 wt.% in methanol | |
PAMAM dendrimer, ethylenediamine core, 6.5 solution | G6.5 | EDA core, carboxyl/ester-terminated | – | 5 wt.% in methanol |
Key features of this series:
(1) Terminal-group differences
Compared with full-generation (amine-terminated) PAMAM dendrimers, these half-generation materials bear carboxyl/ester-type terminal groups. Their net charge shifts from positive to neutral or negative, and cytotoxicity is generally reduced.
(2) Application directions
As neutral/anionic PAMAM backbones, this series is suitable for:
(a) Secondary functionalization via EDC/NHS-mediated coupling (e.g., grafting PEG, dyes, or targeting ligands);
(b) Construction of pH- or ionic-strength-responsive systems;
(c) Use as control materials in toxicity and cellular uptake studies versus amine-terminated analogues.
(3) Significance of specifications
These products are likewise supplied as 5–20 wt.% solutions in methanol, enabling accurate volumetric dosing and convenient scale-up.
III. 1,4-Diaminobutane Core PAMAM (DAB Core Control Series)
Aladdin Cat. No. | Product Name | Structural Generation (Gx.x) | Brief Structural Description | CAS No. | Specification / Concentration |
PAMAM dendrimer, 1,4-diaminobutane core, 1.0 solution | G1.0 | DAB core; low-generation amine-terminated PAMAM, used as a control vs. EDA-G1 | — | 20 wt.% in methanol | |
PAMAM dendrimer, 1,4-diaminobutane core, 6.0 solution | G6.0 | DAB core; high-generation amine-terminated PAMAM, used as a control vs. EDA-G6 | — | 10 wt.% in methanol |
Key features of this series:
(1) Structural variation
With the PAMAM dendritic scaffold maintained, only the length of the core carbon chain is altered. This makes the DAB-core series an ideal structural control for studying the influence of core structure on material properties.
(2) Application directions
(a) Used in parallel with ethylenediamine-core G1/G6 PAMAM to compare particle size, self-assembly behavior, loading efficiency, and cell compatibility;
(b) Suitable for designing “core-structure-variation” experimental groups in publications and projects, thereby improving the completeness and rigor of structure–property studies.
(3) Significance of specifications
Two representative generations are provided—a medium-low generation (G1) and a high generation (G6)—at 10–20 wt.% concentrations, balancing storage convenience and ease of handling.
IV. Cystamine Core PAMAM (Cystamine Core · Redox-Responsive Series)
Aladdin Cat. No. | Product Name | Structural Generation (Gx.x) | Brief Structural Description | CAS No. | Specification / Concentration |
PAMAM dendrimer, cystamine core, generation 2.0 solution | G2.0 | Cystamine core (–S–S–); low-generation amine-terminated PAMAM, degradable precursor for release-type carriers | — | 20 wt.% in methanol | |
PAMAM dendrimer, cystamine core, generation 5.0 solution | G5.0 | Cystamine core (–S–S–); medium–high-generation amine-terminated PAMAM, suitable for redox-responsive carriers | — | 10 wt.% in methanol |
Key features of this series:
(1) Degradability and redox responsiveness
In the presence of high intracellular concentrations of glutathione and other reducing agents, the disulfide bond in the cystamine core can be cleaved, causing the dendrimer to disassemble at the core. This makes the series well suited for constructing redox-responsive drug and gene delivery systems.
(2) Application directions
(a) Drug release triggered by the tumor microenvironment or other intracellular reducing environments;
(b) Design of nanocarriers that can degrade after fulfilling their function, thereby reducing long-term in vivo accumulation.
(3) Significance of specifications
Generations G2 and G5 are selected as representative low- and medium–high-generation materials, respectively, covering both model studies and carrier applications. Concentrations of 20 wt.% and 10 wt.% are provided to facilitate convenient dilution according to experimental needs.
Summary of Selection Guidelines
(1) For fundamental research and literature benchmarking →Prioritize ethylenediamine-core, full-generation PAMAM G0–G5;
(2) When modulation of surface charge or secondary functionalization is required →Select half-generation, carboxyl/ester-terminated PAMAM;
(3) For structural control experiments →Choose 1,4-diaminobutane-core PAMAM;
(4) For redox-responsive or degradable carrier design →Use cystamine-core PAMAM, particularly G2 and G5.
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