Preparation, characterisation and release of carvacrol encapsulated in gellan hydrogel and chitosan nanoparticles for antibacterial application
Studies of plant materials as natural compound such as carvacrol (Carv) for antibacterial agents have gained much attention in the scientific research. It has been proven to be the potential agent in the treatment of infections and is safe for human and animal consumption. However, this free stan...
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my-upm-ir.677192019-03-21T06:19:02Z Preparation, characterisation and release of carvacrol encapsulated in gellan hydrogel and chitosan nanoparticles for antibacterial application 2017-11 Hasnu, Norafida Studies of plant materials as natural compound such as carvacrol (Carv) for antibacterial agents have gained much attention in the scientific research. It has been proven to be the potential agent in the treatment of infections and is safe for human and animal consumption. However, this free standing bioactive compound is unstable in the harsh environment conditions which easily evaporates and prone to degradation due to volatilisation and chemical reaction. In this study, the encapsulation technology helps to provide protection in order to enhance the effectiveness and the release manner thereby improving cost effectiveness of the product. Thus, Carv was encapsulated in two types of host materials which are gellan gum hydrogel thin film (GG-Carv TF) and chitosan nanoparticles (CNP-Carv). Besides that, the release properties are studied for further antibacterial application against Gram-negative bacteria, E. coli. Based on the result, GG-Carv TF showed combination of both functional groups from GG and Carv in FTIR spectra. The CHN analysis further confirmed the encapsulation as evidence of the changes in the element percentage. The swelling and degradation percentage increased with time and the decreasing patterns can be observed as the concentration of Carv increased in the range of 680.94-424.20 % and 26.83-2.67 %, respectively. Highest accumulated release of Carv from GG-Carv TF was recorded with 97.6 %. From the kinetic fitting model, pseudo-second order was observed to fit the GG-Carv TF release profile with r2 > 0.9. GG-Carv TF exhibited the significant antibacterial activity against E. coli with clear inhibition zone of 20 mm while the detection of the bacterial growth by optical density also displayed the continued decrease in sustained and controlled manner. Meanwhile, the encapsulation with the other host, CNP-Carv, the results showed the increment in the size distribution average to 139 nm prior to the blank size of CNP with only 56 nm. This result was complementary with the size of nanoparticles on surface morphology observed using FESEM. The FTIR spectrum also revealed the combination of both functional groups from the CNP and Carv, proving that Carv was successfully encapsulated. Highest accumulated release of Carv from GG-Carv TF was recorded with 28.0 %. From the kinetic fitting model, pseudo-second order was observed to fit the GG-Carv TF release profile with r2 > 0.9. CNP-Carv exhibited significant antibacterial activity against E. coli with the notable inhibition zone of 20 mm and the detection of bacterial growth by optical density also showed a continued decline of bacterial growth. Hence, the gellan gum hydrogel and chitosan nanoparticles are proven to be effective carrier of carvacrol for further antibacterial application. Carvacrol Anti-infective agents 2017-11 Thesis http://psasir.upm.edu.my/id/eprint/67719/ http://psasir.upm.edu.my/id/eprint/67719/1/FS%202018%2015%20IR.pdf text en public masters Universiti Putra Malaysia Carvacrol Anti-infective agents |
| institution |
Universiti Putra Malaysia |
| collection |
PSAS Institutional Repository |
| language |
English |
| topic |
Carvacrol Anti-infective agents |
| spellingShingle |
Carvacrol Anti-infective agents Hasnu, Norafida Preparation, characterisation and release of carvacrol encapsulated in gellan hydrogel and chitosan nanoparticles for antibacterial application |
| description |
Studies of plant materials as natural compound such as carvacrol (Carv) for
antibacterial agents have gained much attention in the scientific research. It has been
proven to be the potential agent in the treatment of infections and is safe for human
and animal consumption. However, this free standing bioactive compound is
unstable in the harsh environment conditions which easily evaporates and prone to
degradation due to volatilisation and chemical reaction. In this study, the
encapsulation technology helps to provide protection in order to enhance the
effectiveness and the release manner thereby improving cost effectiveness of the
product. Thus, Carv was encapsulated in two types of host materials which are gellan
gum hydrogel thin film (GG-Carv TF) and chitosan nanoparticles (CNP-Carv).
Besides that, the release properties are studied for further antibacterial application
against Gram-negative bacteria, E. coli. Based on the result, GG-Carv TF showed
combination of both functional groups from GG and Carv in FTIR spectra. The CHN
analysis further confirmed the encapsulation as evidence of the changes in the
element percentage. The swelling and degradation percentage increased with time
and the decreasing patterns can be observed as the concentration of Carv increased in
the range of 680.94-424.20 % and 26.83-2.67 %, respectively. Highest accumulated
release of Carv from GG-Carv TF was recorded with 97.6 %. From the kinetic fitting
model, pseudo-second order was observed to fit the GG-Carv TF release profile with
r2 > 0.9. GG-Carv TF exhibited the significant antibacterial activity against E. coli
with clear inhibition zone of 20 mm while the detection of the bacterial growth by
optical density also displayed the continued decrease in sustained and controlled
manner. Meanwhile, the encapsulation with the other host, CNP-Carv, the results
showed the increment in the size distribution average to 139 nm prior to the blank size of CNP with only 56 nm. This result was complementary with the size of
nanoparticles on surface morphology observed using FESEM. The FTIR spectrum
also revealed the combination of both functional groups from the CNP and Carv,
proving that Carv was successfully encapsulated. Highest accumulated release of
Carv from GG-Carv TF was recorded with 28.0 %. From the kinetic fitting model,
pseudo-second order was observed to fit the GG-Carv TF release profile with
r2 > 0.9. CNP-Carv exhibited significant antibacterial activity against E. coli with
the notable inhibition zone of 20 mm and the detection of bacterial growth by optical
density also showed a continued decline of bacterial growth. Hence, the gellan gum
hydrogel and chitosan nanoparticles are proven to be effective carrier of carvacrol for
further antibacterial application. |
| format |
Thesis |
| qualification_level |
Master's degree |
| author |
Hasnu, Norafida |
| author_facet |
Hasnu, Norafida |
| author_sort |
Hasnu, Norafida |
| title |
Preparation, characterisation and release of carvacrol encapsulated in gellan hydrogel and chitosan nanoparticles for antibacterial application |
| title_short |
Preparation, characterisation and release of carvacrol encapsulated in gellan hydrogel and chitosan nanoparticles for antibacterial application |
| title_full |
Preparation, characterisation and release of carvacrol encapsulated in gellan hydrogel and chitosan nanoparticles for antibacterial application |
| title_fullStr |
Preparation, characterisation and release of carvacrol encapsulated in gellan hydrogel and chitosan nanoparticles for antibacterial application |
| title_full_unstemmed |
Preparation, characterisation and release of carvacrol encapsulated in gellan hydrogel and chitosan nanoparticles for antibacterial application |
| title_sort |
preparation, characterisation and release of carvacrol encapsulated in gellan hydrogel and chitosan nanoparticles for antibacterial application |
| granting_institution |
Universiti Putra Malaysia |
| publishDate |
2017 |
| url |
http://psasir.upm.edu.my/id/eprint/67719/1/FS%202018%2015%20IR.pdf |
| _version_ |
1747812508469559296 |