In this study, Hottuynia codata extract with ethanol and distilled water as a solvent to analyze the colorant characteristics of the extract, and dyed on cotton and silk fabrics to analyze the differences in dyeing conditions on dyeability.
In addition, ethanol extract of Hottuynia codata extract was added to PU to mix, and the shape and properties of Hottuynia codata/PU nanofibers prepared through electrospinning were analyzed to obtain the following conclusions.
1. As a result of confirming the ultraviolet and visible absorption spectra of distilled water and ethanol extract from Hottuynia codata extract, the absorption peak was observed at 250nm and 330nm in ethanol extract, but the peak at 250nm was hardly observed and weak peak at 350nm in distilled water extract. The absorption peak at 250 nm and 330 nm, which can be seen in the ethanol extract, is a characteristic of flavonoid-based pigments, and it can be seen that the higher the ethanol content, the more flavonoid-based colorant are extracted. Also, Hottuynia codata ethanol extract showed the maximum absorption wavelength near 420nm and 670nm, which confirmed the presence of chlorophyll a, but distilled water extract did not show a distinct absorption peak in the visible part, so it can be seen that the tannin-based extract was the main extract.
2. As a result of FT-IR measurement analysis of Hottuynia codata distilled water extract and ethanol extract, it was confirmed that Phenolic of tannin and quercetin glycosides were extracted from Hottuynia codata extract. In the ethanol extract, the presence of chlorophyll was confirmed, and the tannin component of the distilled water extract was confirmed to be the same hydrolysis type as tannic acid.
3. Total polyphenol content according to the extract of Hottuynia codata was 577.102±13.5791mg/g in ethanol extract and 435.995±3.7986mg/g in distilled water extract. The total flavonoid content of the extract was 551.1632±64.28mg/g for the ethanol extract. The content of distilled water extract was determined to be 266.1963±23.3465mg/g. The total polyphenol and total flavonoid contents of Hottuynia codata ethanol extract were the highest.
4. DPPH radical scavenging activity of Hottuynia codata showed antioxidant activity of 7.92%~35.32% for distilled water extract and 9.36%~42.11% for ethanol extract according to concentration. The ABTS radical scavenging activity of the ethanol extract was about 32.07~99.99% depending on the concentration, and the ABTS radical scavenging ability of the distilled water extract was about 29.22~77.53%, showing high antioxidant activity.
5. The yield of Hottuynia codata ethanol extract was 11.3%, the yield of Hottuynia codata 70% ethanol extract was 25.49%, and the yield of Hottuynia codata distilled water extract was 31%. Hottuynia codata 70% ethanol, cotton fabric dyed with ethanol extracted salt solution, silk fabrics were dyed with YG series color, and cotton fabrics and silk fabrics dyed with distilled water from Hottuynia codata were dyed with Y series color. The dyeability of the salt solution extracted with ethanol was greater than that of distilled water extract. The higher the ethanol content, the greater the dyeability, and the greater the dyeability to silk fabrics than cotton fabrics. The dyeing amount of cotton and silk fabrics dyed with a salt solution of ethanol and distilled water extract of Hottuynia codata increased as the concentration of the extract increased, and showed relatively high dyeability at a salt bath temperature of 80°C and a dyeing time of 60 minutes.
6. As a result of evaluating wash fastness, light fastness, friction fastness, and sweat fastness of cotton fabrics and silk fabrics dyed with a salt solution of ethanol and distilled water extract from Hottuynia codata, all showed high fastness except sunlight fastness.
7. The antimicrobial activity of Staphylococcus aureus against cotton and silk fabrics dyed with Hottuynia codata ethanol extract was excellent at 99.9%, The Klebsiella pneumoniae also showed an excellent antibacterial effect of 98.5% or more, and thus showed better antibacterial effect in ethanol extract than distilled water extract.
8. Cotton fabrics dyed with Hottuynia codata extract showed excellent deodorization rate immediately after 30 min, compared to untreated cotton fabrics, and silk fabrics 99% of ammonia gas after 120 min after dyeing with distilled water extract and 90 min after dyeing with ethanol extract. It was removed above to show excellent deodorizing properties.
9. PU nanofibers have 10% by weight of PU concentration, 12wt%, voltage of 15kV, and TCD of 15cm. The fibers show a mixture of beads and fibrous form, but under PU concentration of 12wt%, the concentration of Hottuynia codata extract is 0wt%, 0.5wt, beads were formed, but at 1wt%, 1.5wt%, and 2wt%, the beads disappeared and relatively uniform nanofibers with average diameters of 277.5±92.86nm, 318.5±76.31nm, and 367.5±38.97nm were available, It was possible to produce relatively uniform nanofibers and the average diameter of the nanofibers increased as the content of Hottuynia codata extract increased.
10. FT-IR, XRD, DSC, TGA analysis confirmed that Hottuynia codata ethanol extract components were successfully bound in the PU matrix. Melting point increased by quercetin, the main pigment component of Hottuynia codata ethanol extract, and thermal stability increased at high temperature.
Through the above study, it is possible to obtain various colors according to the extraction conditions of Hottuynia codata by comparing the dyeing characteristics of Hottuynia codata extracted with each extraction condition and the color change and color fastness of dyed cotton and silk fabrics. This appeared, and established basic data that could be used as natural dyes. Also, as an applied study, it was confirmed that ethanol extract of Hottuynia codata was added to PU, and that composite nanofibers could be produced through electrospinning. Since the Hottuynia codata extract salt solution has high antioxidant activity and the dyed fabric has antibacterial and deodorizing properties, it is judged that the Eoseongcho extract can be applied to various fiber materials such as sanitary napkins by applying the Hottuynia codata extract to nanofibers.
However, in this study, only the possibility of manufacturing PU nanofibers mixed with Hottuynia codata ethanol extract was confirmed. Therefore, it is considered that a follow-up study is needed to confirm the feasibility of female sanitary napkins through additional experiments such as absorbency, antibacterial, deodorizing, and wearing comfort.