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In vitro and in vivo anti-aging effects of compounds isolated from Artemisia iwayomogi

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Abstract

In Korean folk medicine, Artemisia iwayomogi has largely been employed for the improvement of diabetic complications and hepatic function as well as in the treatment of female diseases and skin whitening. Accordingly, the present study sought to assess cosmeceutical activity of Artemisia iwayomogi. Through activity-guided fractionation, scopolin (AI-1), 2,4-dihydroxy-6-methoxy-acetophenone 4-O-β-D-glucoside (AI-2), scopoletin (AI-3), kaempferol-3-O-methyl ether (AI-4) and luteolin (AI-5) were isolated from ethyl acetate and water fractions of Artemisia iwayomogi. Of them, AI-4 and AI-5 exhibited strong antioxidative and whitening effects. In addition, AI-1, AI-3, AI-4, and AI-5 demonstrated considerable anti-wrinkle performances. According to results of quantitative analysis of compounds isolated from Artemisia iwayomogi, scopolin (AI-1) is a major component of Artemisia iwayomogi. Moreover, O/W type cream made by water fraction which included scopolin showed unwrinkling effect for 8 weeks when it was applied to face in an in vivo study. Specific contributions of Artemisia iwayomogi were as follows: AI-1, 1.21 mg/g; AI-2, 0.26 mg/g; AI-3, 0.38 mg/g; AI-4, 0.01 mg/g; and AI-5, 0.04 mg/g.

Introduction

Artemisia iwayomogi, also called Haninjin or Deowijiki, is a native plant that naturally grows across Korea beginning in spring (Jung et al., 2008). Traditional Korean medicine has widely employed Artemisia iwayomogi for its anti-tumor, immune-modulating, anti-mutagenic, anti-oxidant, anti-bacterial, anti-fungal, anti-pyretic, diuretic, liver protective, choleretic and diabetic complications relieving effects among others (Seo & Yun, 2008; Lee et al., 2013; Lee et al., 2017). Globally, the Artemisia genus comprises ca. 400 different plant species. Within the framework of traditional medicine, Artemisia iwayomogi has been used as herbal medicine to treat jaundice caused by acute hepatitis elicited by humidity. It is also used to treat urination problems, itchy skin, chronic hepatitis, hepatic sclerosis and fever (Jang et al., 2012). Artemisia iwayomogi has remarkable heat-lowering and humidity-removing effects (Ahn et al., 2003). Numerous studies have demonstrated that Artemisia iwayomogi fractions and ingredients isolated from Artemisia iwayomogion have protective and anti-inflammatory functions for hepatic cells. However, research on cosmetic effects of Artemisia iwayomogi is scarce. To bridge this gap in the literature, using activity-guided fractionation, five compounds were isolated from Artemisia iwayomogi extract and their anti-oxidation, whitening and anti-aging effects were investigated in the present study. Furthermore, an O/W formulation cream that contained water fraction from Artemisia iwayomogi was used in facial skin test. Results demonstrated that Artemisia iwayomogi could be effectively used as a natural ingredient for cosmeceuticals.

Materials and methods

General experimental procedures

UV spectra were determined on an Optizen 2120 UV spectrophotometer (Korea). NMR spectra were recorded on a Varian Gemini 2000 spectrometer (USA) with 1H-NMR 600 MHz and 13C-NMR 150 MHz. FAB-MS spectra were measured on a VG 70-VSEQ spectrometer (UK). Silica gel (70-230 mesh, Merck, Germany), Sephadex LH-20 (25-100 μm, Pharmacia, Sweden) and ODS gel (400–500 mesh, Waters, USA) were used for column chromatography (CC).

Extraction and isolation

Artemisia iwayomogi (20 kg) was extracted with ethanol with a sonicator at room temperature. Ethanol extract (1.45 kg) was evaporated to dryness in vacuum. This crude extract was suspended in water and then divided into four fractions: hexane (280 g), dichloromethane (150 g), ethyl acetate (485 g) and water fraction (420 g). From ethyl acetate and water fractions which showed potent anti-oxidant activities, five compounds were obtained. The water fraction was fractionated to XAD-4 using water, 30%, 50%, and 100% methanol as eluent. Eluted product with 50% MeOH was subjected to Sephadex gel CC using 30% MeOH to yield compound 1 (4.5 g) and compound 2 (860 mg). The ethyl acetate fraction was subjected to Silica gel CC using DCM:MeOH (10:1) to yield five fractions. Fraction 2 was subjected to Silica gel CC using CHCl3:MeOH (80:1) to yield compound 3 (376 mg), compound 4 (58 mg), and compound 5 (150 mg). These compounds were confirmed based on their spectroscopic values (1H-NMR, 13C-NMR, FAB-MS, UV) that were consistent with literature values: scopolin (Bayoumi et al., 2008), 2,4-dihydroxy-6-methoxy-acetophenone-4-O-ß-D-glucopyranoside (Singh et al., 1997), scopoletin (Bayoumi et al., 2010), kaempferol-3-O-methyl ether (Urbatsch et al., 1975), and luteolin (Kim et al., 2000).

In vitro biological activities

DPPH radical scavenging activity

DPPH radical scavenging activity was measured using the method described by Hatano et al. (Hatano et al., 1989). Briefly, 180 μL of DPPH solution (0.1 mM in ethanol) and 20 μL of compound solution were vortex-mixed and incubated at 37 °C for 30 min. Absorbance at 517 nm was then measured. Ascorbic acid was used as positive control. DPPH radical scavenging activity was expressed as IC50.

Superoxide scavenging activity

Superoxide scavenging activity was determined spectrophotometrically by continuously measuring uric-acid formation at 590 nm with NBT (blue tetrazolium chloride) as substrate (Lu & Foo, 2000). Xanthine oxidase assay consisted of 395 μL reaction mixture containing 50 mM potassium phosphate buffer (pH 7.4), 0.6 mM hypoxanthine, 0.2 mM NBT, and 1 mM EDTA as substrate solution. Thereafter, 5 μL of sample solution and 100 μL of xanthine oxidase (100 mU/mL) were added to the substrate solution. The reaction mixture was incubated at 37 °C for 20 min. Trolox, a well-known xanthine oxidase inhibitor, was then used to stop the reaction. Superoxide scavenging activity was expressed as IC50.

Tyrosinase inhibition activity

Tyrosinase inhibition activity was measured using the method described by Li et al. (Li et al., 2003). Briefly, 450 μL of mixture containing 1.7 mM L-tyrosine and 10 mM sodium phosphate buffer (pH 6.8) was added to 5 μL of sample solution and 250 U/mL of tyrosinase. The reaction mixture was incubated at 37 °C for 60 min, and the absorbance was measured at 475 nm. Kojic acid was used as a positive control. Tyrosinase inhibition activity was expressed as IC50.

Elastase inhibition activity

Elastase inhibition activity was measured using the method described by Yamauch et al. (Yamauchi et al., 2000). Briefly, 500 μL of 50 mM Tris-HCl buffer (pH 8.0) was added to 100 μL of the sample solution and 500 μL of 100 mM porcine pancreas elastase. The mixture was incubated at 37 °C for 5 min. Thereafter, 1.0 mL of 0.8 mM N-Succinyl-(Ala)3-p-nitroanilide was injected into the mixture, after which the mixture was left at 37 °C for 30 min. The absorbance was measured at 405 nm. Ursolic acid was used as positive control. Elastase inhibition activity was expressed as IC50.

Collagenase inhibition activity

Collagenase inhibition activity was determined according to the method reported by Assem (Assem, 2007). Briefly, 320 μL of calcium chloride (10 mM) in 0.2 M Tris-HCl buffer (pH 7.5), 200 μL of Clostridium histolyticum collagenase (0.4 mg/mL), and 200 μL of sample solution were mixed and pre-incubated at 37 °C for 15 min. In the next step, 200 μL of N-[3-(2-Furyl) acryloyl]-Leu-Gly-Pro-Ala (1 mM) was added and the mixture was incubated at 37 °C for 20 min. Absorbance was measured at 324 nm. Disodium-EDTA was used as positive control. Collagenase inhibition activity was expressed as IC50.

In vivo anti-aging effect

Subjects and study protocol

A total of 21 women volunteers aged 30 to 50 years (average age, 39.19 ± 6.02 years) living in Seoul or Gyunggi-do, Republic of Korea, who started to develop wrinkles or already had wrinkles were recruited. They provided consent form to participate in this study. They were not allowed to use anti-wrinkling cosmetics, skin esthetics, plastic surgeries, or other prescribed clinical test cosmetics during the trial period. These volunteers had no history of skin diseases. They underwent a patch test which was performed for 8 weeks. Before the trial, a patch test was performed to the inner side of the arm of participant using water fraction cream of Artemisia iwayomogi with some ingredients known as skin irritants such propylene glycol, sodium lauryl sulfate (SLS), and liquid paraffin to determine their skin response to the product and product safety. After confirming safety, control patch was applied to the corner of the left eye while a cream that contained 1% water fraction of Artemisia iwayomogi was applied to the right corner of the right eye. Left and right side corners of their crow’s feet 2 cm away from the outer corner of eye were then observed. They used the cream after face washing as the final phase of basic make-up in the morning and evening for 8 weeks. During test time, they avoided exposure to ultraviolet radiation from the sun. If skin irritation occurred, they would stop using the cream as requested.

Preparation of cosmetics

Ingredients of O/W formulation cream are shown in Table 1. Part A and part B were dissolved in distilled water which was heated up to 80 °C, respectively. After that, part B was added into part A and the mixture was blended at 3500 rpm for 5 min using a homogenizing mixer. Then, part C was added into the mixture of A and B and cooled down to 45 °C. Part D was then mixed with A, B, and C at 2500 rpm for 2 min and cooled down to 30 °C. The test cream was then added with 1% water fraction of Artemisia iwayomogi. O/W formulation cream alone was used as control.

Table 1 Prescription of O/W-type formulation cosmetics

Measurement and analysis method of wrinkles

For quantitative evaluation of wrinkles, a Skin Visiometer SV600 (Courage & Khazaka, Germany) was used to quantify and analyze the depth of fine wrinkles. It represents the depth of wrinkles numerically using a replica of wrinkled model through a light source. The replica was made to use a silicon base (polymer) and a hardener (catalyst) at a ratio of 1:1 with pressure applied for 10–15 s to prevent air bubbles. Thus, a portion of the prepared mixture was hardened after stuck to the measurement site to make a replica. Transmitted light through the replica was converted into digital information with a video digitalization unit and a graphic card embedded in the PC. The transmitted light was displayed based on the gray value which was in the range of 256 gray value (0 = black, 256 = white). The depth range was 20~30 μm. Positions of wrinkles were digitized using an arbitrary parameter for the shape and depth of wrinkles (R1, R2, R3, R4, and R5). R1 is skin roughness which is the maximum and minimal grayness. R2 is maximum roughness that a wrinkle is divided into five sections and calculated R1 respectively after divided wrinkles. R2 has the highest wrinkle value. R3 is average roughness which is the maximum and minimum grayness. R4 is smoothness depth that a centerline is drawn on the side view of wrinkles. It is calculated that the area meets the centerline. R5 is the arithmetic average roughness. It pertains to the mean depth of a wrinkle.

Identification of compounds

Scopolin (AI-1)

White amorphous powder; UV–Vis λmax (log ɛ) nm: 339, 288 and 227; FAB-MS m/z: 355 [M+H]+. 1H-NMR (600 MHz, DMSO-d6): δ 7.94 (1H, d, J = 9.6 Hz, H-4), δ 7.27 (1H, s, H-5), δ 7.14 (1H, s, H-8), δ 6.31 (1H, d, J = 9.6 Hz, H-3), δ 5.07 (1H, d, J = 7.2 Hz, anomeric-H(Glu-1)), δ 3.80 (3H, s, OCH3); 13C-NMR (125 MHz, DMSO-d6) (Table 2).

Table 2 13C-NMR spectral data of AI 1~3 (DMSO-d6)

2,4-dihydroxy-6-methoxy-acetophenone-4-O-ß-D-glucopyranoside (AI-2)

Yellow amorphous crystal; UV–Vis λmax (log ɛ) nm: 283; FAB-MS m/z: 345 [M+H]+. 1H-NMR (600 MHz, DMSO-d6): δ 7.08 (1H, d, J = 1.8 Hz, H-3), δ 6.12 (1H, d, J = 1.8 Hz, H-5), δ 4.94 (1H, d, J = 7.4 Hz, anomeric-H(Glu-1)), δ 3.82 (3H, s, OH3) and δ 2.55 (3H, s, OCH3); 13C-NMR (125 MHz, DMSO-d6) (Table 2).

Scopoletin (AI-3)

Yellow amorphous crystal; UV–Vis λmax (log ɛ) nm: 344 and 228; FAB-MS m/z: 193 [M+H]+. 1H-NMR (600 MHz, methanol-d6): δ 7.87 (1H, d, J = 9.6 Hz, H-4), δ 7.18 (1H, s, H-5), δ 6.75 (1H, s, H-8), δ 6.19 (1H, d, J = 9 Hz, H-3) and δ 3.79 (3H, s, OCH3); 13C-NMR (125 MHz, methanol-d6) (Table 2).

Kaempferol-3-O-methyl ether (AI-4)

Yellow amorphous crystal; UV–Vis λmax (log ɛ) nm: 344; FAB-MS m/z: 301 [M+H]+. 1H-NMR (600 MHz, DMSO-d6): δ 12.81 (1H, s, OH), δ 8.03 (2H, d, J = 8.8 Hz, H-2′, 6′), δ 7.02 (2H, d, J = 8.8 Hz, H-3′, 5′), δ 6.50 (1H, d, J = 1.8 Hz, H-8), δ 6.26 (1H, d, J = 1.8 Hz, H-6) and δ 3.87 (3H, s, OCH3); 13C-NMR (125 MHz, DMSO-d6) (Table 3).

Table 3 13C-NMR spectral data of AI 4~5 (DMSO-d6)

Luteolin (AI-5)

Yellow amorphous crystal; UV–Vis λmax (log ɛ) nm: 349; FAB-MS m/z: 287 [M+H]+. 1H-NMR (600 MHz, DMSO-d6): δ 6.16 (1H, d, J = 2.4 Hz, H-6), δ 6.43 (1H, d, J = 1.8 Hz, H-8), δ 6.61 (1H, s, H-3), δ 6.87 (1H, d, J = 8.4 Hz, H-5′), δ 7.37 (1H, dd, J = 2.4, 8.4 Hz, H-6′) and δ 7.38 (1H, d, J = 2.4 Hz, H-2′); 13C-NMR (125 MHz, DMSO-d6) (Table 3).

Statistical analysis

Activity results are expressed as means ± standard deviation (SD). All statistical analyses were performed using Statistical Package for Social Sciences (SPSS for Windows ver. 19.0). A p value of <0.05 was considered statistically significant.

HPLC analysis

For the analysis of contents and patterns of compounds isolated from Artemisia iwayomogi, conditions for the HPLC system (Waters Associates, USA) were established. For the analysis, Artemisia iwayomogi was pulverized and filtered using a grade no. 50 filter.

Then, 1.0 g of filtered Artemisia iwayomogi was sonicated in 30 mL ethanol, extracted three times in repetition and filtered through a 0.45-μm-membrane filter. This filtered liquid was used as the test solution. In addition, 1.0 mg taken from each isolated compound of I~V was dissolved in 10 mL methanol and used as standard solution. The test and standard solution were tested and their contents were measured with HPLC analysis conditions (Tables 4 and 5).

Table 4 HPLC analysis conditions of AI 1~3
Table 5 HPLC analysis conditions of AI 4~5

Results and discussion

Antioxidant activity

Antioxidant activities of isolated compounds were measured using DPPH and superoxide scavenging activity assays with xanthine oxidase and an antioxidative activity test using ABTS. In the DPPH scavenging assay, luteolin was found to have a potent antioxidative activity in a dose-dependent manner. In the superoxide scavenging assay, luteolin and kaempferol-3-O-methyl ether showed potent antioxidative activity that was stronger than the positive control (see Table 6). As reported in a previous study (Nguyen et al., 2004), luteolin has an antioxidant activity that can cause direct inhibition of xanthin oxidase activity.

Table 6 IC50 values for activity by compounds from Artemisia iwayomogi

Whitening activity

To investigate the whitening effect by mushroom tyrosinase inhibition activity, L-tyrosine was used as a substrate. Among different compounds, scopoletin, luteolin, and kaempferol-3-O-methyl ether showed significant tyrosinase inhibition activities, with IC50 values of 7.03, 10.18 and 12.18 μM, respectively (Table 6).

Anti-wrinkle activity

In the elastase inhibitory assay, scopoletin, luteolin, and kaempferol-3-O-methyl ether showed significant elastase inhibition activities, with IC50 values of 38.20, 45.35, and 46.17 μM, respectively, all of which were stronger than the positive control (Table 6). Compounds scopolin, luteolin scopoletin, and kaempferol-3-O-methyl ether showed remarkable collagenase inhibition activities, higher than disodium-EDTA (Table 6). As reported in a previous study, scopoletin has the efficacy of promoting type I collagen synthesis in normal human fibroblast in PICP assay (Lee et al., 2006).

Analysis of wrinkles with a Skin Visiometer

Analysis results with a Skin Visiometer SV600 showed anti-wrinkle effect after using cosmetics that contained water fraction of Artemisia iwayomogi for 8 weeks to the right side of face. The control was applied to the left side of face. Wrinkle replica measurement results of R1, R2, R3, R4, and R5 were obtained using the skin visiometer. For each parameter, the lower the value, the better the wrinkle index (Table 7).

Table 7 The change of skin roughness

Quantitative analysis of isolated compounds

Analytical conditions were established using an HPLC reverse-phase column for the five components isolated from ethyl acetate and water fractions. Contents of components were as follows: scopolin, 1.14-1.28 mg/g; 2,4-dihydroxy-6-methoxy-acetophenone-4-O-β-D-glucopyranoside, 0.25-0.27 mg/g; scopoletin, 0.34-0.42 mg/g; kaempferol-3-O-methyl ether, 0.00-0.02 mg/g; and luteolin, 0.02-0.06 mg/g (Table 8). Scopolin and scopoletin were found to be major components of Artemisia iwayomogi. Thus, they can be considered to be eligible as index ingredients for herbal medicine and extracts of Artemisia iwayomogi.

Table 8 The contents (mg/g) of AI-1~5 weight by HPLC

Conclusion

In Korean traditional medicine, Artemisia iwayomogi is routinely used to improve hepatic functioning, to fight against female diseases, for skin whitening and so on. From ethanol extract of the aerial part of Artemisia iwayomogi, hexane, dichloromethane, ethyl acetate, and water fractions were obtained with solvent-fractionating method. An experiment was performed in order to measure antioxidative activities of the extract and its four fractions using both DPPH and ABTS tests. In addition, superoxide-scavenging activity was investigated using xanthine oxidase. Tyrosinase inhibition activity was assessed in order to investigate the whitening effect. Elastase and collagenase inhibition activities were also measured to evaluate anti-aging effect. Results showed that the antioxidative activities of ethyl acetate and water fraction were increased in a concentration-dependent manner. In addition, significant skin whitening and anti-wrinkle effects were observed.

Materials used in this study were isolated from ethyl acetate and water fractions according to activity-guided fractionation. Column chromatography was performed using silica gel, ODS and Sephadex LH-20 gel for both ethyl acetate and water fractions. Six components were isolated and their structures were subsequently identified using the following techniques: 1H-NMR, 13C-NMR, UV spectra, and FAB-MS. HPLC reverse-phase column technique was used in order to establish analytical conditions for the five ingredients. Following this, their contents were assessed. Content results were as follows: scopolin, 1.14–1.28 mg/g; 2,4-dihydroxy 6-methoxy-acetophenone-4-O-β-D-glucopyranoside, 0.33–0.35 mg/g; scopoletin, 2.07–2.15 mg/g; kaempferol-3-O-methyl ether, 0-0.02 mg/g; and luteolin, 0.02–0.06 mg/g (Fig. 1). Scopoletin was determined as a major ingredient of Artemisia iwayomog. Results demonstrate that the above ingredients are able to be applied as index ingredients.

Fig. 1
figure1

Structures of the compounds 1–5

An anti-wrinkle O/W type cosmetic was created using water fraction containing scopolin. This component was used due to its high activity and productivity. During the period of eight weeks, subjects applied the cosmetic to a pre-designated area around their eyes. Within this time, the anti-wrinkling effect of the cosmetic was evaluated. There was an observed change in the height of the wrinkles during the study period. This demonstrates that the water fraction of Artemisia iwayomogi has significant anti-aging effect.

Compound-I was identified as scopolin, compound-II as 2,4-dihydroxy-6-methoxy-acetophenone-4-O-β-D-glucoside, compound-III as scopoletin, compound-IV as kaempferol-3-O-methyl ether, compound-V as luteolin, and compound-VI as genkwanin. From these isolated components, scopoletin and luteolin were found to have significant antioxidative and whitening activities. In addition, scopolin, scopoletin, and luteolin were found to have remarkable anti-aging effects.

This is the first study to investigate the anti-wrinkle effect of compounds isolated from Artemisia iwayomogi using elastase and collagenase inhibitory assays. Based on results of this study, it can be concluded that Artemisia iwayomogi has the potential to be used as a key material for cosmeceuticals aimed at consumers who are looking for skin whitening and anti-aging products.

Availability of data and materials

Please contact author for data requests.

Abbreviations

13C-NMR:

Carbon nuclear magnetic resonance

1H-NMR:

Proton nuclear magnetic resonance

ABTS:

2,2′-Azino-bis (3-ethylbenzothiazoline-6-sulphonic acid)

AI:

Artemisia iwayomogi

AI-1:

Scopolin

AI-2:

2,4-Dihydroxy-6-methoxy-acetophenone-4-O-β-D-glucoside

AI-3:

Scopoletin

AI-4:

Kaempferol-3-O-methyl ether

AI-5:

Luteolin

AI-6:

Genkwanin

CC:

Column chromatography

CHCl3 :

Chloroform

DCM:

Dichloromethane

DMSO:

Dimethyl sulfoxide

DPPH:

2,2-Diphenyl-1-picrylhydrazyl

EA:

Ethyl acetate

EDTA:

Ethylenediamine-N, N, N′, N′-tetraacetic acid

FAB-MS:

Fast atom bombardment mass spectrometry

HEX:

Hexane

HPLC:

High-performance liquid chromatography

MeOH:

Methanol

NBT:

Nitroblue tetrazolium test

O/W:

Oil in water

ODS gel:

Octadecylsilyl gel

PICP:

Carboxyl-terminal propeptide of type I procollagen

R1:

Skin roughness

R2:

Maximum roughness

R3:

Average roughness

R4:

Smoothness depth

R5:

Arithmetic average roughness

SD:

Standard deviation

SLS:

Sodium lauryl sulfate

SPSS:

Statistical Package for Social Science

UV:

Ultraviolet

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Acknowledgements

This research was supported by a grant 18172MFDS206 from Ministry of Food and Drug Safety in 2018.

Funding

The funding sponsors had no role in the design of the study; collection, analyses, or interpretation of the data; writing of the manuscript; or the decision to publish the results.

Author information

K-KY extracted and isolated the compounds. L-EJ contributed to make the sample of cosmetics and attempted to the volunteer. P-CH assisted the revision of the manuscript and W-WK managed and designed the research project. All authors read and approved the final manuscript.

Correspondence to Wan Kyunn Whang or Cho Hi Park.

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Kim, K.Y., Lee, E.J., Whang, W.K. et al. In vitro and in vivo anti-aging effects of compounds isolated from Artemisia iwayomogi. J Anal Sci Technol 10, 35 (2019). https://doi.org/10.1186/s40543-019-0193-1

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Keywords

  • Artemisia iwayomogi
  • Scopolin
  • Anti-wrinkle effect
  • Cosmeceuticals