Key Findings
DESU® Microcrystalline cellulose XD-602 showed the highest water absorption rate of 410%, followed by DESU® Microcrystalline cellulose XD-601 at 340% and DESU® Microcrystalline cellulose XD-901 at 330%. Their fibrous or internally porous structures provide more capillary pathways for rapid water uptake.
High-density DESU® Microcrystalline cellulose PH-301 and DESU® Microcrystalline cellulose PH-302 showed lower water absorption rates of 210% and 220%, respectively, consistent with their lower porosity and higher-density particle structures.
All tested DESU® MCC grades reached water absorption equilibrium in approximately 2 minutes. These differences provide a practical basis for selecting microcrystalline cellulose for wet granulation, direct compression and other oral solid dosage processes.
Introduction
Pharmaceutical microcrystalline cellulose (MCC) is widely used as a filler and binder in oral solid dosage forms. Its compressibility, stability, porosity and water absorption behavior make it suitable for wet granulation, direct compression and tablet manufacturing.
Different MCC grades vary in particle morphology, particle size distribution, porosity and bulk density. These structural differences can significantly influence water uptake, powder processing and formulation performance.
This study evaluates the water absorption performance of different DESU® pharmaceutical microcrystalline cellulose grades, including conventional PH-series grades, high-density MCC grades and special-purpose XD grades.
Water absorption rate and particle microstructure were compared to provide practical guidance for selecting microcrystalline cellulose for wet granulation, MCC for direct compression tablets and other pharmaceutical formulation processes.
Experimental Methods
How Was MCC Water Absorption Measured?
The water absorption test followed the method described in Study on Water Penetration in Rapidly Disintegrating Formulations. The apparatus consisted of a sintered glass funnel connected to a graduated pipette. The system was filled with deionized water, and qualitative filter paper was placed above the funnel.
For each test, 200 mg of DESU® MCC powder was gently placed on the filter paper while maintaining the powder in a loose state. The decrease in water volume in the graduated pipette was recorded as the sample water absorption.
Each MCC grade was tested in triplicate, and the average result was used.
Water Absorption Rate (%) = Water Absorption Volume (mL) / Sample Weight (g) × 100%
Figure 1. Water absorption measurement experimental setup.
Results and Discussion
How Does Water Absorption Differ Among DESU® MCC Grades?
All tested DESU® MCC grades absorbed water rapidly after contact with water and reached water absorption equilibrium in approximately 2 minutes.
However, the total water absorption capacity varied substantially among the different MCC grades, reflecting differences in particle morphology, porosity and density.
Figure 2. Water absorption rate of different DESU® microcrystalline cellulose grades.
How Does Particle Structure Affect MCC Water Absorption?
DESU® Microcrystalline cellulose PH-101 has a predominantly rod-like morphology composed mainly of primary particles. Its relatively high specific surface area and porosity resulted in a water absorption rate of 310%.
DESU® Microcrystalline cellulose PH-102 contains both primary particles and aggregates. Its larger and more complex particle structure maintains substantial porosity and provides multiple pathways for water penetration, resulting in a water absorption rate of 280%.
DESU® Microcrystalline cellulose PH-105 showed a water absorption rate of approximately 210%.
Why Do High-Density MCC Grades Absorb Less Water?
DESU® Microcrystalline cellulose PH-200 has an approximately spherical particle structure with relatively compact particle packing. The lower interparticle pore volume reduces capillary penetration of water, resulting in a lower water absorption rate of approximately 190%.
At the same time, this particle structure contributes to favorable powder flow, making DESU® MCC PH-200 suitable for direct compression processes requiring improved flowability and die filling.
The high-density grades DESU® MCC PH-301 and DESU® MCC PH-302 have reduced particle porosity and showed water absorption rates of approximately 210% and 220%, respectively.
Why Do DESU® XD Grades Show Higher Water Absorption?
DESU® MCC XD-601 and DESU® MCC XD-602 are special-purpose MCC grades characterized by fibrous particle structures and good formability.
DESU® MCC XD-602 has a higher aspect ratio and a more developed fibrous network than DESU® MCC XD-601. This structure provides more interconnected capillary channels and produced the highest measured water absorption rate, approximately 410%.
DESU® MCC XD-601 showed a water absorption rate of approximately 340%.
DESU® MCC XD-901 has an approximately spherical particle morphology with numerous internal pores. This structure combines relatively good flowability with a high water absorption rate of approximately 330%.
What Do These Results Mean for MCC Grade Selection?
The results show that MCC water absorption performance is strongly influenced by particle morphology, porosity, density and internal capillary structure.
- DESU® MCC XD-601 and XD-602: high water uptake associated with their fibrous structures and developed capillary networks.
- DESU® MCC XD-901: combines internal porosity, high water absorption and favorable flow properties.
- DESU® MCC PH-101 and PH-102: maintain relatively high water absorption because of their porous particle structures.
- DESU® MCC PH-200: lower water absorption combined with improved flowability for direct compression applications.
- DESU® MCC PH-301 and PH-302: high-density structures provide lower porosity and lower water uptake while supporting efficient powder filling.
These findings provide experimental support for selecting MCC excipients according to the specific requirements of wet granulation, direct compression, powder flow and tablet formulation development.
DESU® MCC — Functional Microcrystalline Cellulose for Formulation Performance.