A comparative study on surface/interface mechanism and antibacterial properties of different hybrid materials prepared with essential oils active ingredients and palygorskite

The present study investigated the structure, morphology, thermal behavior, and bacterial growth analysis of novel three-component hybrid materials synthesized by the sol-gel method. The inorganic silica matrix was weakly bonded to the network of two organic components: a well-known polymer such as polyethylene glycol (PEG, average molar mass of about 4000 g/mol), and an antioxidant constituted by chlorogenic acid (CGA). In particular, a first series was made by a 50 wt% PEG-based (CGA-free) silica hybrid along with two 50 wt% PEG-based hybrids containing 10 and 20 wt% of CGA (denoted as SP50, SP50C10 and SP50C20, respectively). A second series contained a fixed amount of CGA (20 wt%) in silica-based hybrids: one was the PEG-free material (SC20) and the other two contained 12 and 50 wt% of PEG, respectively (SP12C20 and SP50C20, respectively), being the latter already included in the first series. The X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images of freshly prepared materials confirmed that all the materials were amorphous and homogeneous regardless of the content of PEG or CGA. The thermogravimetric (TG) analysis revealed a higher water content was adsorbed into the two component hybrids (SP50 and SC20) because of the availability of a larger number of H-bonds to be formed with water with respect to those of silica/PEG/CGA (SPC), where silica matrix was involved in these bonds with both organic components. Conversely, the PEG-rich materials (SP50C10 and SP50C20, both with 50 wt% of the polymer) retained a lower content of water. Decomposition of PEG and CGA occurred in almost the same temperature interval regardless of the content of each organic component. The antibacterial properties of the SiO2/PEG/CGA hybrid materials were studied in pellets using either Escherichia coli and Enterococcus faecalis, respectively. Excellent antibacterial activity was found against both bacteria regardless of the amount of polymer in the hybrids.

Download Full-text

A comparative study of the antibacterial properties of milk from different domestic animals

International Journal of Dairy Technology ◽

10.1111/1471-0307.12757 ◽

2021 ◽

Author(s):

Alireza Ebrahimi ◽

Mir‐Hassan Moosavy ◽

Seyed Amin Khatibi ◽

Zahra Barabadi ◽

Abolfazl Hajibemani

Keyword(s):

Comparative Study ◽

Antibacterial Properties ◽

Domestic Animals

Download Full-text

Antibacterial properties and chemical characterization of the essential oils from summer savory extracted by microwave-assisted hydrodistillation

Brazilian Journal of Microbiology ◽

10.1590/s1517-83822011000400031 ◽

2011 ◽

Vol 42 (4) ◽

pp. 1453-1462 ◽

Cited By ~ 13

Author(s):

Shila Rezvanpanah ◽

Karamatollah Rezaei ◽

Mohammad-Taghi Golmakani ◽

Seyyed Hadi Razavi

Keyword(s):

Essential Oils ◽

Antibacterial Properties ◽

Chemical Characterization ◽

Microwave Assisted

Download Full-text

Comparative study on the essential oils of Myosotis arvensis and Myosotis palustris herbs (Boraginaceae)

Acta Physiologiae Plantarum ◽

10.1007/s11738-014-1562-4 ◽

2014 ◽

Vol 36 (8) ◽

pp. 2283-2286 ◽

Cited By ~ 2

Author(s):

Paulina Znajdek-Awiżeń ◽

Wiesława Bylka ◽

Dorota Gawenda-Kempczyńska ◽

Iwona Paszek

Keyword(s):

Comparative Study ◽

Essential Oils ◽

Myosotis Arvensis

Download Full-text

THE EFFECT OF ESSENTIAL OILS ON MICROORGANISMS CAUSING CARIES AND PERIODONTITIS

Актуальні проблеми сучасної медицини Вісник Української медичної стоматологічної академії ◽

10.31718/2077-1096.20.2.253 ◽

2020 ◽

Vol 20 (2) ◽

pp. 253-259

Author(s):

N.M. Devyatkina ◽

N.O. Bobrova ◽

E.M. Vazhnichaya

Keyword(s):

Essential Oils ◽

Dental Treatment ◽

Therapeutic Potential ◽

Oral Care ◽

Antibacterial Properties ◽

Herbal Medicines ◽

Oral Streptococci ◽

Tea Tree

The oral cavity contains a large number of bacteria, some of which are involved in the development of caries and periodontitis (S. mutans, S. sobrinus, Lactobacilli spp, P. intermedia, P. gingivalis, and T. forythus). The disadvantages of existing antiseptics used in dentistry necessitate the study of antibacterial properties of herbal medicines, and, in particular, of essential oils. The aim of this review is to provide the analysis of literature sources from PubMed and Google Scholar databases related to the effects of essential oils of cloves, mint, thyme, eucalyptus, tea tree and their components on cariogenic and periodontopathic microflora. It was found out that the most in vitro studies evaluated the effects of essential oils or isolated compounds (eugenol, menthol, thymol, carvacrol, eucalyptol, and terpinene-4-ol) on S. mutans, which is considered to be the most cariogenic of oral streptococci, and the researchers limited to defining the susceptibility of the microorganism and effects on biofilm formation. Only in a few studies, the effects of essential oils on the virulence factors of oral pathogens, in particular glycosyl transferase, are represented. Clinical trials of essential oils, their components and combinations confirm the therapeutic potential of these agents in vivo, but raise the question of their effectiveness, taking into account the short-term action, which does not exceed the potency of chlorhexidine. Essential oils of cloves, mint, thyme, eucalyptus, tea tree and their components should be used for treating caries and periodontitis. They are also promising when used as agents of the oral care products, preservatives of the dental medicinal forms, and as remedies for halitosis. With a rational prescription, essential oils can be useful in improving the quality of dental treatment and preventive procedures.

Download Full-text