The authors wish to make a change to their published paper [1]. Figure 6 should be replaced with that shown below. The authors apologize for any inconvenience caused.
Figure 6.
Structure of guar gum succinate.
The change does not affect the scientific results. The manuscript will be updated and the original will remain online on the article webpage http://www.mdpi.com/2073-4360/9/4/137.
Reference
- 1.Rizwan M., Yahya R., Hassan A., Yar M., Azzahari A.D., Selvanathan V., Sonsudin F., Abouloula C.N. pH sensitive hydrogels in drug delivery: Brief history, properties, swelling, and release mechanism, material selection and applications. Polymers. 2017;9:137. doi: 10.3390/polym9040137. [DOI] [PMC free article] [PubMed] [Google Scholar]