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Article

Essential and Recovery Oils from Matricaria chamomilla Flowers as Environmentally Friendly Fungicides Against Four Fungi Isolated from Cultural Heritage Objects

by
Mervat EL-Hefny
1,*,
Wael A.A. Abo Elgat
2,
Asma A. Al-Huqail
3,* and
Hayssam M. Ali
3
1
Department of Floriculture, Ornamental Horticulture and Garden Design, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria 21545, Egypt
2
Restoration department, High Institute of Tourism, Hotel Management and Restoration, Abukir, Alexandria 21526, Egypt
3
Chair of Climate Change, Environmental Development and Vegetation Cover, Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
*
Authors to whom correspondence should be addressed.
Processes 2019, 7(11), 809; https://doi.org/10.3390/pr7110809
Submission received: 2 October 2019 / Revised: 25 October 2019 / Accepted: 29 October 2019 / Published: 4 November 2019
(This article belongs to the Special Issue Green Separation and Extraction Processes)
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Abstract

:
Recovery oils, obtained from the hydro-distillation of the fresh flowers of Matricaria chamomilla, as well as essential oils, were studied for their environmental purposes in cultural heritage. These oils were assayed for their antifungal activity against the growth of four molds isolated from archaeological manuscripts (Aspergillus niger), museum gypsum board Antique (A. flavus), museum archaeological tissue (A. terreus), and museum organic materials (Fusarium culmorum) of cultural heritage objects. Oils were applied to inhibit the growth of fungi at amounts of 25, 50, 75 and, 100 µL/mL, and compared with negative controls (0 µL/mL) or positive controls (Sertaconazol 3g/L). Using GC/MS analysis, the main chemical compounds identified in the essential oil were (Z)-β-farnesene (27%), D-limonene (15.25%), and α-bisabolol oxide A (14.9%), while the compounds identified in the recovery oil were α-bisabolol oxide A (18.6%), d-limonene (8.82%), and α-bisabolol oxide B (7.13%). A low amount of chamazulene was observed in both essential and recovery oils, with amounts of 0.73% and 3.50%, respectively. Recovery oil, at a concentration of 75 and 100 µL/mL, showed fungal mycelial inhibition (FMI) percentage for the growth of A. niger, with values of 78% and 85%, respectively. At a concentration of 100 µL/mL, both oils showed 100% FMI of A. terreus. Oils showed weak activity against the growth of A. flavus. Essential oils at 100 µL/mL had good activity against the growth of F. culmorum, with FMI of 86.6%. The results suggest the potential use of essential and recovery oils from M. chamomilla fresh flowers as environmentally friendly bio-fungicides.

1. Introduction

In domestic environmental conditions, fungi are known as a major biodeteriogens of cultural heritage. Fungi are able to colonize and degrade materials (wood, paper, textiles, leather, plastic, stones, metal, and clay) that have been used for the construction of cultural heritage sites, such as monuments and artifacts, causing stains in their surfaces or changing their morphological characterizations [1,2,3,4,5,6,7,8,9,10]. Therefore, the chemical treatment applications used in cultural heritage conservation must be non-toxic and non-destructive [2,11].
Natural extracts and essential oils (EOs) from aromatic and medicinal plants have been reported to have potential antifungal activities against the growth of certain mold species, such as Aspergillus, Fusarium, Alternaria, Rhizoctonia, and Chaetomium, [12,13,14,15,16,17,18,19]. Morus alba heartwood and Maclura pomifera bark methanoilc extracts had a significant effect on the linear growth of T. harzianum [5]. Wood specimens, treated with Pinus rigida heartwood extract or essential oil inhibited growth of Alt. alternata, F. subglutinans, C. globosum, A. niger, and T. viride [9,10]. Melia azedarach wood, treated with 3% methanolic extract of M. paradisiaca peel, showed strong antifungal activity against F. culmorum and R. solani [12]. EO, extracted from different parts of Citrus aurantium with d-limonene being the principal compound, showed good antibacterial activity [13]. Leucaena leucocephala wood, treated with acetone extract from either the inner or outer bark of Acer saccharum var. saccharum in combination with citric acid showed antifungal activity against T. viride, F. subglutinans, and A. niger [14]. Amongst the n-hexane oily extracts, M. chamomilla flowers extract treated wood samples observed the lowest activity against the growth of F. culmorum, P. chrysogenum and R. solani [15].
Chemical compounds, related to EOs and phenolic and flavonoid, prevent fungal growth through the inhibition of mycelia, conidial production, and sporulation of fungi [16]. EOs from different plants have been reported to inhibit the fungal pathogens of F. moniliforme, F. oxysporum, Rhizoctonia solani, A. solani, and Aspergillus sp. [17,18,19].
Chamomile (Matricaria recutita L., syn: M. chamomilla or M. suaveolens), is one of the most important medicinal herbs native to southern and Eastern Europe, growing in Russia, Germany, France, Hungary, and Brazil. It can also be found in North Africa [20,21]. Chamomile has been used in herbal remedies for thousands of years, having been known in ancient Egypt, Greece, and Rome [22]. Flowers have a blue EO content, ranging from 0.2% to 1.9%, which has been used in various applications [23,24]. Extracts and EOs of M. chamomilla exhibit a wide range of biological activities, such as antimicrobial, antioxidant and anti-inflammatory properties [25,26].
Chamazulene, a sesquiterpene compound responsible for the blue EO of chamomile, is used in the pharmaceutical and cosmetic industries [27]. The amount of chamazulene in various chamomiles depends on the origin and age of the material and was found to decrease during flowers’ storage [28]. Different studies showed the presence of the following compounds in the flower or root EO chamazulene: α-bisabolol, (E)-β-farnesene, germacrene d, spathulenol, (E)-nerolidol, farnesene, geraniol, β-elemene, linalool, nerol, τ-cadinol, τ-muurolol, β-caryophyllene, cis-caryophyllene, and caryophyllene oxide [15,29,30,31].
The main compounds identified in the EOs of flowers from M. chamomilla were chamazulene, trans-trans-farnesol, isopropyl hexadecanoate, and E-β-farnesol. These have been observed to have potential antifungal activity [32]. Bisabolol oxide A, (Z)-β-farnesene, 4-isopropenyl-1-methyl-cyclohexene, and chamazulene were reported as the main compounds in an n-hexane extract of air-dried flowers of M. recutita [15], demonstrating good antifungal activity. The identified compound of α-bisabolol, from the EO of M. chamomilla flowers, has shown good antimicrobial properties [33,34], whereas α-bisabolol and chamazulene are considered antiseptic [35].
The present study aimed to evaluate the effects of essential and recovery oils from M. chamomilla (fresh flowers) on the growth of four fungi, isolated from cultural heritage.

2. Materials and Methods

2.1. Extraction of Essential and Recovery Oils

Flowers of Matricaria chamomilla were collected during March 2019, from Alexandria, Egypt. About 100 g of fresh flowers were put in a 2 L flask containing 1500 mL distilled water, then their essential oil was extracted by hydrodistillation in a Clevenger apparatus for 2 h [13]. The distillate was mixed with n-hexane, to extract the recovery oil dissolved in water (hydrosol) using a funnel separator. The percentages of the oils were 1.5% and 1.9%, from EO and recovery oils, respectively.

2.2. Tested Fungal Isolates

All fungi used in this study were isolated from different organic and inorganic substrata of cultural heritage objects in Egypt (Table 1). For DNA extraction, each isolate was grown in potato dextrose broth for three to four days. The mycelia of each isolate were harvested and processed for genomic DNA extraction, using a protocol published by Saitoh [36]. Analyses of DNA sequences of partial ITS gene were performed according to our previous published article [37].

2.3. GC–MS Analysis of Essential Oil and the n-Hexane Recovered Oil

The essential oil and n-hexane recovered oil from flowers of Matricaria chamomilla were analyzed for their chemical constitutes, using Focus GC-DSQ Mass Spectrometer (Thermo Scientific, Austin, TX, USA) with a direct capillary column TG–5MS (30 m × 0.25 mm × 0.25 µm film thickness) apparatus, at Atomic and Molecular Physics Unit, Experimental Nuclear Physics Department, Nuclear Research Centre, Egyptian Atomic Energy Authority, Inshas, Cairo, Egypt. The column oven temperature programs were initially held at 45 °C, and then increased by 5 °C/min to 200 °C hold for 5 min, and then increased to 300 °C, with 30 increments of 5 °C/min [15].
The compounds were identified through a comparison of their retention times and mass spectra with those of the WILEY 09 and NIST 11 mass spectral database. Further confirmation of chemical compounds was reported by measuring the Standard Index and Reverse Standard Index with Xcalibur 3.0 data system of GC/MS, where the value ≥ 650 is acceptable to confirm the compounds [14,15,38].

2.4. Antifungal Activity of Essential and Recovery Oils

The antifungal activity of oils were measured against the growth of A. niger, A. terreus, A. flavus, and F. culmorum. Oils of M. chamomilla were dissolved in a mixture of dimethyl sulfoxide (DMSO) 10%, and Tween 40 and distilled water (1:0.5:1) were added to a warm potato dextrose agar (PDA) medium (40 °C to 45 °C), at a concentration of 25 µL/mL, 50 µL/mL, 75 µL/mL, and 100 µL/mL, before immediately being poured into 9 cm Petri dishes. Using a sterile pipette, each Petri dish was given exactly 20 mm of a treated PDA medium. Sertaconazol 3 g/L (standard antibiotic) was used as a positive control. The negative control treatment contained DMSO 10%, Tween 40, and distilled water (1:0.5:1). The mixture of dilution was used as a negative control. Each treatment was tested in triplicate. A mycelial disc, with a 9 mm diameter of the pathogenic fungi from a seven-day-old colony, was transferred to the center of the treated PDA dishes and controls.
14 days from the incubation period, at 26 ± 1 °C, the inhibition percentage of mycelial growth was calculated using the following equation [39]:
Mycelial growth inhibition (%) = [(Ac − At)/Ac] × 100
where Ac and At represent the average diameters of the fungal colony of control and treatment, respectively.

2.5. Statistical Analysis

Results of the inhibition percentage of the diameter growth for each fungus were statistically analyzed based on two factors (oil type and oil amount) using analysis of variance, SAS system [40]. The differences between the mean of each treatment were recorded using LSD0.05.

3. Results

3.1. Visual Observation of Fungal Inhibition

Figure 1, Figure 2, Figure 3 and Figure 4 show the visual observation of the inhibition in growth of Aspergillus flavus, A. niger, A. terreus, and Fusarium culmorum by the application of four amounts of both oils. It can be seen that upon increasing oil amount, the inhibition of fungal mycilial growth increased. No inhibition of fungal growth was shown in the plates with negative control treatment (without oils). Plates inoculated with each fungus and treated with the positive control showed good inhibition of the fungal mycilial growth.

3.2. In vitro Antifungal Activity of Essential and Recovery Oils

Table 2 presents the antifungal activity of essential and recovery oils from the fresh flowers of M. chamomilla. Recovery oils, at amounts of 75 and 100 µL/mL, showed a fungal mycelial inhibition (FMI) percentage for the growth of A. niger, with values of 78% and 85%, respectively. The same amount of essential oil showed FMI values of 73% and 84%, respectively. However, these values are lower that the FMI reported by the positive control (87%).
Both oils, applied at 100 µL/mL, showed 100% FMI of A. terreus, higher than the value observed in the positive control (89.66%). Essential and recovery oils at 75 µL/mL showed FMI of 65.66% and 58.33%, respectively. Other concentrations showed limited impact on the growth of A. terreus. Oils showed limited impact on the growth of A. flavus, where all the studied concentrations from both oils presented a much lower FMI than the positive control (88.66%). Essential and recovery oils at 100 µL/mL showed FMI values of 52.33% and 47.33%, respectively, against A. flavus. Essential oil at 100 µL/mL had good activity against the growth of F. culmorum, with an FMI of 86.66%, and, at 75, µL/mL with a value of 65.33%, compared to 91% of positive control (Sertaconazol 3 g/L).

3.3. Chemical Composition of the Essential and Recovery Oils

Table 3 presents the chemical composition of the essential oil from M. chamomilla (fresh flowers) as analyzed by GC/MS apparatus. The main compounds in the essential oil were (Z)-β-farnesene (27.00%), d-limonene (15.25%), α-bisabolol oxide A (14.90%), palmitic acid (6.44%), (E)-germacrene d (3.71%), γ-terpinene (3.54%), and citronellal (3.02%), while low amounts of chamazulene were observed (0.73%).
Table 4 presents the chemical compounds identified in the recovery oil from the hydrodistillation of M. chamomilla fresh flowers. The main compounds were α-bisabolol oxide A (18.60%), d-limonene (8.82%), α-bisabolol oxide B (7.13%), dodecane (5.92%), α-farnesene (5.16%), undecane (5.03%), oleic acid (4.51%), citronellal (4.24%), bisabolone oxide (3.81%), α-terpineol (3.73%), and chamazulene (3.50%).

4. Discussion

In the present study, essential and recovery oils from M. chamomilla fresh flowers were reported to have potential antifungal activity against the growth of fungi associated with the biodeterioration of cultural heritage (Aspergillus niger, A. terreus, A. flavus, and Fusarium culmorum).
These activities could be significantly related to the main identified compounds in both oils, such as (Z)-β-farnesene, d-limonene, α-bisabolol oxide A, α-bisabolol oxide B, and even chamazulene, which was present in low amounts.
The main identified compounds in the essential oil of M. chamomilla fresh flowers were (Z)-β-farnesene, d-limonene, α-bisabolol oxide A, and palmitic acid, with quantities of 27%, 15.25%, 14.9%, and 6.4%, respectively. In the recovery oil, the main compounds were α-bisabolol oxide A, d-limonene, and α-bisabolol oxide B, with amounts of 18.60%, 8.82%, and 7.13%, respectively. The identified main compound (α-bisabolol oxide A) is much higher than the isolated compound from the Iranian Camomille, which reached 2.19% [26] and was recognized by the α-bisabolol (56.86%) and trans, trans-Farnesol (15.64%) as a chemotype. Another study [41] showed that α-bisabolol oxide (38%), camphene (9.11%), sabinene (4.87%), limonene (6%), 1,8-cineole (7.12%), camphor (6.54%), and α-pinene (6%) were the main compounds of the essential oil, from aerial parts of the M. recutita. Chamazulene was identified in low amounts (0.73%, and 3.50%, in essential and recovery oils, respectively). This agrees with Tolouee et al. [26] who found that chamazulene was identified in the essential oil from flowers of M. chamomilla with amounts of 2.18%, while it reached 61.3% in the essential oil of M. chamomilla flower [32].
Our results agreed with the study of Satyal [42] who found that (E)-β-farnesene, α-bisabolol oxide A, (E,E)-α-farnesene, and α-bisabolol oxide B, and α-bisabolone oxide A were the main compounds of Nepalese chamomile oil, at quantities of 42.2, 22.3, 8.3, 4.5 and 4, respectively, and demonstrated good antimicrobial activity. Several studies presented the main compounds of the essential oil from M. chamomilla flowers as (E)-β-farnesene, chamazulene, α-bisabolol, α-bisabolol oxides A, and α-bisabolol oxides B, in the ranges of 4.9–8.1%, 2.3–10.9%, 4.8–11.3%, 25.5–28.7%, and 12.2–30.9%, respectively [29,43,44,45]. The bioactive compounds showed strong antifungal activity against both phyto and medical pathogenic fungi [26,46,47]. The flower’s essential oil showed potential antifungal activity against A. flavus, A. fumigatus, A. niger, F. oxysporum and Trichoderma harzianum [32]. EO, with its high content of α-bisabolol oxide A (48.22%), α-bisabolol oxide B (23.31%), and α-bisabolol (12.1%), and low chamazulene content (2.42%) demonstrated good antifungal activity against A. flavus and C. albicans [48]. An α-bisabolol-rich M. chamomilla oil showed antifungal activity against A. niger at concentrations above 125 μg/mL and the oil inhibited hyphal growth and conidial production [26]. However, some reports showed that the essential oils and extracts from M. chamomilla have moderate to weak activities against the growth of fungi [15,49,50,51].
Recent work showed that the n-hexane oily extract of air-dried flowers had the following main compounds: bisabolol oxide A, (Z)-β-farnesene, 4-isopropenyl-1-methyl-cyclohexene, chamazulene, d-limonene, (R)-(+)-citronellal, and γ-terpinene, with values of 16.60%, 16.11%, 14.18%, 11.27%, 4.82%, 3.65% and 3.07%), respectively [15]. However, when applied to wood, weak activity against the fungal infestation of Fusarium culmorum, Rhizoctonia solani, and Penicillium chrysogenum was found 15].
It was reported that the two most prominent compounds found in oils of M. chamomilla, farnesol and α-bisabolol, have potential antifungal activity [52]. β-farnesene, α-farnesene, and α-bisabolol and its oxide were reported as its main compounds [53,54]. Essential oils with these were observed to have good antifungal activity against A. niger, Aspergillus sp. and Candida albicans [55]. An oil rich in α-bisabolol oxide A, extracted from M. chamomilla flowers from Neyshabur, Iran, showed potential activity against B. cereus, S. aureus, and Proteus vulgaris [56].
There are several reports regarding the use of natural products in the field of cultural heritage conservation [2]. EOs of Pimpinella anisum and Allium sativum showed the best antifungal activity against fungal strains isolated from Cuban and Argentine Documentary Heritage, including A. niger, A. clavatus, Penicillium sp. and Fusarium sp. [57].
Finally, it could be concluded that from the above data and from the literature, the essential oil from M. chamomilla flowers has a potential antifungal activity and, notably, that the recovered oil also showed potent antifungal activity.

5. Conclusions

This study highlighted the importance of using essential and recovery oils from fresh flowers of Matricaria chamomilla. Both oils presented potential bioactive molecules in their chemical compositions, demonstrating activity against the growth of four fungi isolated from cultural heritage objects. Interestingly, our results identified novel and strong antifungal agents against four deteriorating fungi by applying the recovery oil, which could be considered as an alternative source for the production of commercial antifungal agents. Further studies are required to develop new methods to apply the oils in the field of cultural heritage preservation.

Author Contributions

M.E.-H. and W.A.A.A.E. designed and carried out the methodology, as well as conducted laboratory analyses; A.A.A.-H. and H.M.A. contributed reagents/materials/analytical tools, and all the authors shared in writing and revising the article.

Funding

This research was funded by the Deanship of Scientific Research, King Saud University, through the Vice Deanship of Scientific Research Chairs.

Acknowledgments

The authors are grateful to the Deanship of Scientific Research, King Saud University, for funding through the Vice Deanship of Scientific Research Chairs. The authors also thank the Deanship of Scientific Research and RSSU at King Saud University for their technical support.

Conflicts of Interest

The authors declare no conflict of interest.

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Processes 07 00809 g001 550
Figure 1. Visual observation of the antifungal activities of essential (EO) and recovery (RO) oils from M. chamomilla (fresh flowers) against the growth of Aspergillus flavus. (a) Negative control (0 µL/mL); (b) Positive control (Sertaconazol 3 g/L).
Figure 1. Visual observation of the antifungal activities of essential (EO) and recovery (RO) oils from M. chamomilla (fresh flowers) against the growth of Aspergillus flavus. (a) Negative control (0 µL/mL); (b) Positive control (Sertaconazol 3 g/L).
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Figure 2. Visual observation of the antifungal activities of essential (EO) and recovery (RO) oils from M. chamomilla (flowers) against the growth of Aspergillus niger. (a) Negative control (0 µL/mL); (b) Positive control (Sertaconazol 3 g/L).
Figure 2. Visual observation of the antifungal activities of essential (EO) and recovery (RO) oils from M. chamomilla (flowers) against the growth of Aspergillus niger. (a) Negative control (0 µL/mL); (b) Positive control (Sertaconazol 3 g/L).
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Figure 3. Visual observation of the antifungal activities of essential (EO) and recovery (RO) oils from M. chamomilla (flowers) against the growth of Aspergillus terreus. (a) Negative control (0 µL/mL); (b) Positive control (Sertaconazol 3 g/L).
Figure 3. Visual observation of the antifungal activities of essential (EO) and recovery (RO) oils from M. chamomilla (flowers) against the growth of Aspergillus terreus. (a) Negative control (0 µL/mL); (b) Positive control (Sertaconazol 3 g/L).
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Figure 4. Visual observation of the antifungal activities of essential (EO) and recovery (RO) oils from M. chamomilla (flowers) against the growth of Fusarium culmorum. (a) Negative control (0 µL/mL); (b) Positive control (Sertaconazol 3 g/L).
Figure 4. Visual observation of the antifungal activities of essential (EO) and recovery (RO) oils from M. chamomilla (flowers) against the growth of Fusarium culmorum. (a) Negative control (0 µL/mL); (b) Positive control (Sertaconazol 3 g/L).
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Table
Table 1. Fungal isolates chosen for the study of the antifungal activity of essential and recovery oils from Matricaria chamomilla flowers.
Table 1. Fungal isolates chosen for the study of the antifungal activity of essential and recovery oils from Matricaria chamomilla flowers.
IsolatesSubstrataStrainAccession Number
Aspergillus flavusMuseum Gypsum board AntiqueAFl375MH355958
Aspergillus nigerArchaeological ManuscriptsFC24771MH355955
Aspergillus terreusMuseum archaeological tissueY.H. Yeh V0103MH355953
Fusarium culmorumMuseum organic materialsCBS 128537MH355954
Table
Table 2. Inhibition percentage of the diameter growth of A. niger, A. terreus, A. flavus, and F. culmorum as affected by essential and recovery oils from M. chamomilla.
Table 2. Inhibition percentage of the diameter growth of A. niger, A. terreus, A. flavus, and F. culmorum as affected by essential and recovery oils from M. chamomilla.
Oil Type Inhibition Percentage of Diameter Growth
Oil Conc. µL/mLAspergillus flavusAspergillus terreusAspergillus nigerFusarium culmorum
Negative control0.000.000.000.00
Sertaconazol (3 g/L)88.66 ± 1.1589.66 ± 1.5287 ± 191 ± 1
Essential oil2510.66 ± 5.514.33 ± 1.1563.33 ± 2.5123.33 ± 2.31
5028.33 ± 4.169.66 ± 3.2168.33 ± 1.5250 ± 5
7537.66 ± 4.5158.33 ± 2.5173 ± 1.7365.33 ± 0.57
10052.33 ± 2.5110084 ± 186.66 ± 0.57
Recovery oil254.66 ± 2.517 ± 2.6451 ± 3.618 ± 3
5025 ± 222.66 ± 0.5766 ± 130.66 ± 3.51
7531.33 ± 3.7865.66 ± 1.5278 ± 1.7336 ± 2
10047.33 ± 2.5110085 ± 257.66 ± 2.51
p-value ********
Values are means ± SD, **: Highly significant at 0.01 level of probability.
Table
Table 3. Chemical composition of the essential oil from M. chamomilla (fresh flowers).
Table 3. Chemical composition of the essential oil from M. chamomilla (fresh flowers).
Compound NameRetention Time (min)Area %Molecular FormulaMolecular WeightStandard IndexReverse Standard Index
Decane3.220.20C10H22142808916
Sabinene3.440.29C10H16136810823
β-Pinene4.710.22C10H16136812852
Undecane4.770.24C11H24156861923
Myrcene5.790.37C10H16136856920
d-Limonene6.5915.25C10H16136924924
Tetradecane6.920.35C14H30198877929
γ-Terpinene7.643.54C10H16136934944
m-Cymene8.210.71C10H14134908944
Ocimene8.520.23C10H16136858865
Citronellal13.543.02C10H18O154948950
Linalool15.210.21C10H18O154899936
Isopulegol15.770.26C10H18O154898951
β-Caryophyllene16.470.87C15H24204920944
Aromadendrene17.610.22C15H24204853915
(Z)-β-farnesene18.2927.00C15H24204928929
α-Muurolene18.710.35C15H24204854886
α-Terpineol18.820.73C10H18O154853894
Chamazulene32.980.73C14H16184781815
(E)-Germacrene D19.153.71C15H24204947954
(Z,E)-α-Farnesene19.550.95C15H24204905931
Lepidozene19.681.61C15H24204898905
α-Farnesene20.085.62C15H24204949955
Δ-Cadinene20.220.66C15H24204886929
Citronellol20.371.00C10H20O156907917
Diethylene glycol24.900.39C4H10O3106818891
2,5-Octadecadiynoic acid methyl ester26.120.20C19H30O2290686692
Dimethyl anthranilate26.880.69C9H11NO2165676721
Viridiflorol27.050.20C15H26O222795894
Spathulenol27.840.39C15H24O220801852
α-Bisabolol oxide B28.050.86C15H26O2238855891
Bisabolone oxide28.850.58C15H24O2236781850
2′-Hexyl-1,1′-bicyclopropane-2-octanoic acid methyl ester29.020.18C21H38O2322695709
α-Bisabolol29.610.32C15H26O222773889
α-Cadinol29.880.26C15H26O222757823
α-Bisabolol oxide A33.4414.90C15H26O2238858870
Palmitic acid36.256.44C16H32O2256850877
Table
Table 4. Chemical composition of the recovered oil M. chamomilla (fresh flowers).
Table 4. Chemical composition of the recovered oil M. chamomilla (fresh flowers).
Compound NameRetention Time (min)Area %Molecular FormulaMolecular WeightStandard IndexReverse Standard Index
5-Ethyl-2-nonanol3.350.52C11H24O172730744
1-Isobutyl-3-methyl-cyclopentane3.460.39C10H20140710771
Undecane4.765.03C11H24156899944
1-Hexadecanol, 2-methyl-5.110.69C17H36O256759762
2-methyl undecane5.951.11C12H26170835892
Decyl Ether6.150.58C20H42O298789804
d-Limonene6.558.82C10H16136904915
Dodecane6.925.92C12H26170923929
2,6,10,14-Tetramethylheptadecane8.241.00C21H44296790843
Nonadecane8.351.54C19H40268789869
Citronellal13.564.24C10H18O154800820
Chamazulene18.263.50C15H24204912930
α-Terpineol18.853.73C10H18O154790796
α-Farnesene20.055.16C15H24204916941
2-(2-Hydroxyethoxy)ethanol24.901.60C4H10O3106849883
α-Bisabolol oxide B28.057.13C15H26O2238824870
Bisabolone oxide28.843.81C15H24O2236728809
Cyclopropanetetradecanoic acid, 2-octyl-methyl ester30.620.46C26H50O2394738750
α-Bisabolol oxide A33.0818.60C15H26O2238852870
Oleic acid33.174.51C18H34O2282744844
Heptaethylene glycol34.001.38C14H30O8326775811

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MDPI and ACS Style

EL-Hefny, M.; Abo Elgat, W.A.A.; Al-Huqail, A.A.; Ali, H.M. Essential and Recovery Oils from Matricaria chamomilla Flowers as Environmentally Friendly Fungicides Against Four Fungi Isolated from Cultural Heritage Objects. Processes 2019, 7, 809. https://doi.org/10.3390/pr7110809

AMA Style

EL-Hefny M, Abo Elgat WAA, Al-Huqail AA, Ali HM. Essential and Recovery Oils from Matricaria chamomilla Flowers as Environmentally Friendly Fungicides Against Four Fungi Isolated from Cultural Heritage Objects. Processes. 2019; 7(11):809. https://doi.org/10.3390/pr7110809

Chicago/Turabian Style

EL-Hefny, Mervat, Wael A.A. Abo Elgat, Asma A. Al-Huqail, and Hayssam M. Ali. 2019. "Essential and Recovery Oils from Matricaria chamomilla Flowers as Environmentally Friendly Fungicides Against Four Fungi Isolated from Cultural Heritage Objects" Processes 7, no. 11: 809. https://doi.org/10.3390/pr7110809

APA Style

EL-Hefny, M., Abo Elgat, W. A. A., Al-Huqail, A. A., & Ali, H. M. (2019). Essential and Recovery Oils from Matricaria chamomilla Flowers as Environmentally Friendly Fungicides Against Four Fungi Isolated from Cultural Heritage Objects. Processes, 7(11), 809. https://doi.org/10.3390/pr7110809

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