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. 2022 Nov 3;14(21):4691.
doi: 10.3390/polym14214691.

Preparation of Citral Compound and Its Bamboo Antimildew Properties

Yingying Shan  1 , Shiqin Chen  1 , Jingjing Zhang  1 , Chungui Du  1 , Chunlin Liu  1 , Fei Yang  1 , Wenxiu Yin  1 , Yuran Shao  1 , Yuting Wang  1
Affiliations

Preparation of Citral Compound and Its Bamboo Antimildew Properties

Yingying Shan et al. Polymers (Basel). .

Abstract

To reduce the amount of citral used without reducing the antimildew performance of bamboo, the citral compound preparation process, the distribution of the compound in bamboo, and its antimildew performance were investigated using the Oxford cup method, Fourier-transform infrared spectroscopy, and ultraviolet spectrophotometry. The results revealed that the combination of citral with cinnamaldehyde or thymol may lead to partial chemical reactions, which may change the chemical structure of citral and affect its bacteriostatic properties. The bacteriostatic properties of the citraldehyde thymol compound against common molds of bamboo were considerably superior to those of the citral cinnamaldehyde compound. The limonaldehyde thymol compound showed a low distribution trend outside and vice versa inside in the treated bamboo. The citral thymol compound exhibited good antimildew performance at a concentration of 200 mg/mL. The citral thymol compound could reduce the amount of citral by approximately 67 mg/mL without reducing the antimildew performance of bamboo.

Keywords: bamboo; cinnamaldehyde; citral compound; mildew resistance; mold; thymol.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Screenshots of l1, l2, and l3.
Figure 2
Figure 2
Infrared spectra of citral and citral compound solutions (C, citral solution; CC1, a compound formulated with citral and cinnamaldehyde; CT1, a compound formulated with citral and thymol).
Figure 3
Figure 3
Inhibitory effect of citral and citral compound solutions against bamboo molds (C, citral solution; CC1, a compound formulated with citral and cinnamaldehyde; CT1, a compound formulated with citral and thymol).
Figure 4
Figure 4
Effects of citral and citral compound solutions on the diameters of the inhibition zone of bamboo molds (C, citral solution; CC1, a compound formulated with citral and cinnamaldehyde; CT1, a compound formulated with citral and thymol).
Figure 5
Figure 5
Ultraviolet absorption spectra of the standard solutions (C, citral standard solution; T: Tween 80 standard solution; CT, standard solution mixed of citral and Tween 80; T1, thymol standard solution; CTT1, standard solution mixed of citral and thymol).
Figure 6
Figure 6
Ultraviolet absorption spectra of bamboo strips treated with citral and thymol compound (l1, supernatant of length 0–1 mm; l2, supernatant of length 1–2 mm; l3, supernatant of length 2–3 mm).
Figure 7
Figure 7
Antimildew photographs of untreated and treated bamboo strips on day 28.
See this image and copyright information in PMC

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