The rate of absorption of pla depends on which factors
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Explanation:
PLA/PLGA are widely use because of their FDA approval.
Ratio of PLA vs PLGA is mainly consider to control de rate of polymer erosion .
It is faster with PLGA and with low molecular weight.
Viscosity has more to do with the process of NP fabrication and the size targetted for NPs.
The targetting itself is not related to PLA/PLGA nature of NPs.
The mix of other polymers such as PEG is generally chosen to get a better biocompatibility. To sumarize :
1) rate of delivery you want , has to be define before to chose the molecular weight and the ratio of PLA/PLGA,
2) the process of fabrication
3) if you want to target specific tissues you would had another ingredient.
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