CN116531289A - Stable olive leaf extract composition - Google Patents

Stable olive leaf extract composition Download PDF

Info

Publication number
CN116531289A
CN116531289A CN202310405689.5A CN202310405689A CN116531289A CN 116531289 A CN116531289 A CN 116531289A CN 202310405689 A CN202310405689 A CN 202310405689A CN 116531289 A CN116531289 A CN 116531289A
Authority
CN
China
Prior art keywords
olive leaf
leaf extract
oxo
oleuropein
composition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310405689.5A
Other languages
Chinese (zh)
Inventor
黄虎
陶侃
黄云霞
张奕
王静一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Zhongyi Daily Chemical Co ltd
Original Assignee
Shanghai Zhongyi Daily Chemical Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Zhongyi Daily Chemical Co ltd filed Critical Shanghai Zhongyi Daily Chemical Co ltd
Priority to CN202310405689.5A priority Critical patent/CN116531289A/en
Publication of CN116531289A publication Critical patent/CN116531289A/en
Pending legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00Cosmetics or similar toiletry preparations
    • A61K8/18Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/96Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution
    • A61K8/97Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution from algae, fungi, lichens or plants; from derivatives thereof
    • A61K8/9783Angiosperms [Magnoliophyta]
    • A61K8/9789Magnoliopsida [dicotyledons]
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00Cosmetics or similar toiletry preparations
    • A61K8/18Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/49Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61QSPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00Preparations for care of the skin
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/52Stabilizers
    • A61K2800/522Antioxidants; Radical scavengers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/30Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Epidemiology (AREA)
  • Birds (AREA)
  • Mycology (AREA)
  • Microbiology (AREA)
  • Botany (AREA)
  • Biotechnology (AREA)
  • Engineering & Computer Science (AREA)
  • Dermatology (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Cosmetics (AREA)

Abstract

The invention provides a stable olive leaf extract composition. The composition is achieved by adding the amino acid derivative oxo-thiazolidinecarboxylic acid to olive leaf extract. In addition, the invention also provides application of the olive leaf extract and the oxo-thiazolidine carboxylic acid composition in cosmetics and a method for preparing the composition. Finally, the invention proves that the addition of the oxo-thiazolidinecarboxylic acid as an antioxidant can significantly improve the discoloration problem of the olive leaf extract, and the addition of the oxo-thiazolidinecarboxylic acid can slow down the degradation of the oleuropein as a main active substance in the olive leaf extract.

Description

Stable olive leaf extract composition
Technical Field
The invention relates to the field of cosmetics, and mainly relates to an olive leaf extract composition for stabilization.
Background
Olea europaea L.) is a evergreen tree of Oleaceae, native to the Mediterranean coast, a well-known woody oil tree species in the world. The olive leaf contains abundant active ingredients including oleuropein, hydroxytyrosol, flavonoids, polyphenols, etc. The research shows that the olive leaf extract has the functions of resisting oxidation, inflammation, bacteria, viruses and the like, and is widely applied to the fields of medicines and cosmetics. However, the stability of the main active substances in olive leaves, such as oleuropein, is low, and the changes of the external environment, such as illumination, temperature, pH, acid, alkali, enzyme, etc., can cause degradation, which affects the biological activity (the original flavor, etc., the biosynthesis of olive hydroxytyrosol and the research progress of its derivatives, in the chemistry and industry of forestry, volume 35, phase 2, 154-162, 2015). The specific expression is that the color of the olive leaf extract is deepened, and the content of active substances is reduced.
Patent CN102273623a, "a preparation method of olive leaf extract", improves the stability of olive leaf extract by improving the extraction process. Patent CN115245483A, an immunocyte preparation and a preparation method thereof, improves the stability of oleuropein by forming gel, and patent CN107019672A, a preparation method of olive polyphenol extract long-circulating liposome rich in hydroxytyrosol and verbascoside, improves the stability of olive polyphenol by forming liposome. Although the above method can improve the stability of active substances in olive leaf extract, the treatment is too complicated and has limited practical significance for application in cosmetic formulations. Therefore, there is a need to develop a simple method to improve the stability of olive leaf extract and expand its application range in cosmetic formulations.
Disclosure of Invention
The method for stabilizing olive leaf extract proposed in the previous research mostly forms gel or inclusion by physical method to reduce the influence of external environment on active substance to increase its stability. This method increases the processing steps of the raw materials and limits the application of olive leaf extract in cosmetics. The addition of antioxidants or light stabilizers can increase the stability of the plant extract, but the nature of the antioxidants and light stabilizers and their effect on the formulation need to be considered.
The invention introduces a combination of an amino acid derivative and an olive leaf extract, which has good water solubility and high safety, can slow down the color change of the olive leaf extract caused by environmental change, and can reduce the degradation rate of the oleuropein as a main active substance in the olive leaf extract to a certain extent.
In one aspect, the present invention provides a composition for stabilizing olive leaf extract comprising olive leaf extract and an oxo-thiazolidinecarboxylic acid. The composition is obtained by adding an oxo-thiazolidinecarboxylic acid to olive leaf extract. Oxo-thiazolidine carboxylic acid is an amino acid derivative with a chemical formula of C 4 H 5 NO 3 S has a structural formula of L-2-oxo thiazole-4 carboxylic acid, and the structural formula is shown in formula 1:
further, the olive leaf extract in the composition may be extracted by extraction, ultrasonic-assisted extraction, microwave-assisted extraction, supercritical carbon dioxide extraction, etc., and the extraction mode is not particularly limited. The extract may be a solution or a solid, and the form thereof is not particularly limited. Olive leaves for extraction have oleuropein content of more than 5%, and are stored in cool and ventilated place to avoid degradation of active substances.
Preferably, the olive leaf extract is prepared by a leaching method and a membrane separation process.
Further, the olive leaf extract comprises the following substances: oleuropein, hydroxytyrosol, acteoside, luteolin, apigenin, quercetin, rutin, kaempferol, etc. The active material generally has a phenolic hydroxyl group and a conjugated structure, and is susceptible to deterioration by environmental influences such as oxygen, radicals, and temperature. The color and efficacy changes affect the range of application in cosmetics. The addition of antioxidants can protect the active substance and increase its shelf life.
Further, the main component of the olive leaf extract is oleuropein, and the content of the oleuropein is more than 0.1%.
Preferably, the oleuropein content of the olive leaf extract is greater than 0.6%.
Further, the ratio of the oxo-thiazolidinecarboxylic acid to oleuropein in the olive leaf extract is (0.01-10): 1.
preferably, the ratio of the oxo-thiazolidinecarboxylic acid to oleuropein in the olive leaf extract is (0.1-5): 1.
further preferably, the ratio of the oxo-thiazolidinecarboxylic acid to oleuropein in the olive leaf extract is (0.5-2): 1.
in another aspect, the present invention provides a method for stabilizing olive leaf extract by adding an oxo-thiazolidinecarboxylic acid to olive leaf extract to improve stability.
Further, the ratio of the oxo-thiazolidinecarboxylic acid to oleuropein in the olive leaf extract is (0.01-10): 1.
preferably, the ratio of the oxo-thiazolidinecarboxylic acid to oleuropein in the olive leaf extract is (0.1-5): 1.
further preferably, the ratio of the oxo-thiazolidinecarboxylic acid to oleuropein in the olive leaf extract is (0.5-2): 1.
in another aspect, the present invention provides the use of an oxo-thiazolidinecarboxylic acid for the preparation of a formulation for inhibiting the degradation of oleuropein in olive leaf extracts.
In another aspect, the present invention provides the use of an oxo-thiazolidinecarboxylic acid for the preparation of a formulation for improving the oxidative discoloration problem of olive leaf extracts.
In another aspect, the present invention provides a cosmetic comprising the stable olive leaf extract composition described above.
Further, in the cosmetic, the content of the composition ranges from 0.01 to 30%.
The beneficial effects of the invention include:
1. a stable olive leaf extract composition is provided, comprising olive leaf extract and oxo-thiazolidinecarboxylic acid.
2. The addition of the oxo-thiazolidinecarboxylic acid proved to slow down the degradation of the main active substance oleuropein in the olive leaf extract.
3. The addition of the oxo-thiazolidinecarboxylic acid proved to be able to significantly improve the oxidative discoloration problem of olive leaf extracts.
4. Greatly increases the application range of the olive leaf extract in cosmetics.
Drawings
FIG. 1 Effect of different antioxidants on stability of olive leaf extract in formulations (groups 1-10)
FIG. 2 effect of 0.15% of oxo-thiazolidinecarboxylic acid on stability of olive leaf extract (groups 11-18)
FIG. 3 effect of 0.3% of oxo-thiazolidinecarboxylic acid on stability of olive leaf extract (groups 19-30)
Detailed Description
Example 1 study of the differences in the stability improvement of different antioxidants on olive leaf extracts
First, it was investigated whether the stability of olive leaf extract was improved by oxothiazolidinecarboxylic acid as compared with pentaerythritol tetrakis (di-t-butylhydroxyhydrocinnamate), glucosyl rutin, (tris (tetramethylhydroxypiperidinol) citrate, diethylhexyl butylidene malonate and the like, ten sets of examples of group numbers 1 to 10 were used to investigate the difference in the improvement of the stability of olive leaf extract by different antioxidants, and the composition ratios are shown in table 1.
Table 1: composition ratio of groups 1 to 10
Antioxidants in groups 1-10 include varying concentrations of oxo-thiazolidinecarboxylic acid, pentaerythritol tetrakis (di-t-butylhydroxyhydrocinnamate), glucosyl rutin, (tris (tetramethylhydroxypiperidinol) citrate, diethylhexyl butylidenimalonate, and combinations thereof.
The color change of examples 1-10 was observed after 10 days of storage at different temperature conditions (-18 ℃, 4 ℃, RT, 48 ℃, part of the samples were not tested at room temperature). The results show that under high temperature conditions, groups 3-10 all show a significant darkening, i.e. pentaerythritol tetrakis (di-tert-butylhydroxyhydrocinnamate), glucosyl rutin, (tri (tetramethylhydroxypiperidinol) citrate and diethylhexyl butylidenimalonate all failed to improve the stability of the olive leaf extract, groups 1 and 2 showed a lower degree of color change than the other groups under high temperature conditions, i.e. the oxothiazolidine carboxylic acid had a certain improvement in the stability of the olive leaf extract, and FIG. 1 lists the color change of groups 1-10 after 10 days of storage at different temperatures.
The conclusion is as follows:
pentaerythritol tetrakis (di-tert-butylhydroxyhydrocinnamate), glucosyl rutin, (tri (tetramethylhydroxypiperidinol) citrate and diethylhexyl butylidenimalonate failed to improve the stability of olive leaf extract.
Example 2 study of the Effect of oxo-thiazolidinecarboxylic acid on the stability of olive leaf extract
In order to further investigate the effect of the oxo-thiazolidine carboxylic acid on the stability of olive leaf extract, the effect of temperature (4 ℃ C. And 40 ℃ C. Respectively) and aqueous pH (5.5 and 6 respectively) on the colour of the solution was studied using groups 11-18, the composition ratios are shown in Table 2. Wherein the content of oleuropein in the olive leaf extract is more than 1%.
Table 2: composition ratio of groups 11 to 18
After adjusting the pH to a specified value by using a trace of arginine and citric acid, the groups 11 to 18 are placed in a refrigerator or an oven at a corresponding temperature, and the color change of the solution is observed after taking out on the 7 th day, the 14 th day and the 28 th day. In the sample without the addition of the antioxidant oxothiazolidine carboxylic acid, a prolonged color of the solution, an increase in temperature and a deepening of the rise in pH were observed. Compared with a sample without the oxo-thiazolidine carboxylic acid under the same treatment condition, the sample with the oxo-thiazolidine carboxylic acid has a light color, namely the oxo-thiazolidine carboxylic acid has a certain protection effect on the olive leaf extract, and can slow down the oxidative discoloration. FIG. 2 shows the color change of groups 11-18 after 10 days of standing at different temperatures.
The conclusion is as follows:
the more quickly the solution color deepens over time, the temperature increases and the pH rises. Compared with a sample without the oxo-thiazolidine carboxylic acid under the same treatment condition, the sample with the oxo-thiazolidine carboxylic acid has a light color, namely the oxo-thiazolidine carboxylic acid has a certain protection effect on the olive leaf extract, and can slow down the oxidative discoloration.
Example 3 investigation of the Effect of the content of oxothiazolidinecarboxylic acid on the stability of olive leaf extract
The color change of olive leaf extract at 0.3% of the oxothiazolidinecarboxylic acid content was investigated using a test method similar to the above example under different conditions of temperature (4 ℃ C., 40 ℃ C.) and pH values of aqueous solutions (5, 5.5, 6), the composition distribution ratios are shown in Table 3, and the color change results are shown in FIG. 3. Wherein the content of oleuropein in the olive leaf extract is more than 1%.
Table 3: composition ratio of group 19-30
In the sample without the addition of the antioxidant oxothiazolidine carboxylic acid, a prolonged color of the solution, an increase in temperature and a deepening of the rise in pH were observed. Compared with a sample without the oxo-thiazolidine carboxylic acid under the same treatment condition, the sample with the oxo-thiazolidine carboxylic acid has a light color, namely the oxo-thiazolidine carboxylic acid has a certain protection effect on the olive leaf extract, and can slow down the oxidative discoloration. FIG. 3 shows the color change of groups 19-30 after 10 days of standing at different temperatures.
The conclusion is as follows:
as can be seen by comparing the corresponding samples in fig. 2 and 3 (groups 14 and 26, groups 18 and 30): the oxidative discoloration of olive leaf extract can be further slowed down by increasing the concentration of the oxo-thiazolidinecarboxylic acid.
Example 4 investigation of the Effect of oxo-thiazolidinecarboxylic acid on Oleuropein degradation
The most important active ingredient in olive leaf extract is oleuropein. Oleuropein is easily degraded by the influence of environmental changes such as light, acid, alkali, enzyme and the like, and the biological activity of the oleuropein is influenced. The variation in the content of oleuropein in groups 11-18 over 14 days was tested by HPLC and the results are shown in Table 4.
Table 4: variation of Oleuropein content within 14 days in groups 11-18
Comparing the degradation rates of oleuropein in groups 11-18 under different aqueous conditions, it is known that increasing the pH and temperature of the aqueous solution increases the degradation rate of oleuropein. In groups 11-18, at day 7, the addition of an oxo-thiazolidinecarboxylic acid did not affect the degradation of oleuropein; on day 14, the addition of the oxo-thiazolidine carboxylic acid has no influence on the degradation rate of oleuropein at low temperature, and the oxo-thiazolidine carboxylic acid can reduce the degradation rate of oleuropein in aqueous solutions with pH=5.5 and pH=6 at high temperature. I.e. the degradation rate of oleuropein is mainly affected by the aqueous solution conditions, but at high temperature the oxo-thiazolidinecarboxylic acid can reduce the degradation rate of oleuropein to a certain extent.
The conclusion is as follows:
the oxo-thiazolidinecarboxylic acid can remarkably improve the discoloration problem of the olive leaf extract and slow down the degradation of the oleuropein which is a main active substance in the olive leaf extract to a certain extent. The addition of the oxo-thiazolidinecarboxylic acid can improve the stability of the olive leaf extract and increase the application range of the olive leaf extract in cosmetic formulations.
The present invention is not limited to the specific embodiments described above, and any equivalent modifications and substitutions easily come within the technical scope of the present invention as those skilled in the art can easily come within the scope of the present invention.
Description of efficacy and sources of drugs used in the examples:
the olive leaf is from Gansu Lonnan, and the olive leaf extract is solution with oleuropein content of more than 0.6% by leaching method and membrane separation process.
The oxo-thiazolidine carboxylic acid is an amino acid derivative, is mostly used as a whitening active ingredient in cosmetics, has good antioxidation effect, and is purchased from Nanjing Sibiraeae biochemical industry Co.
Pentaerythritol tetrakis (di-tert-butylhydroxyhydrocinnamate), a cinnamic acid derivative, is a good antioxidant available from basf (china) limited.
(Tri (tetramethyl hydroxypiperidinol) citrate is a derivative of tetramethyl piperidine, a light stabilizer with excellent properties, and is purchased from Basiff (China) Inc.
Glucosyl rutin is a derivative of rutin, and has very strong antioxidant effect, and is purchased from Xianting.
Diethylhexyl syringylidene malonate is a light stabilizer available from merck chemical technologies.

Claims (10)

1. A stable olive leaf extract composition, comprising an olive leaf extract and an oxo-thiazolidinecarboxylic acid.
2. The composition of claim 1, wherein the ratio of the oxothiazolidinecarboxylic acid to oleuropein in the olive leaf extract is (0.01-10): 1.
3. the composition of claim 2, wherein the oleuropein content of the olive leaf extract is greater than 0.1%.
4. A method for stabilizing olive leaf extract, characterized in that the stability is improved by adding an oxo-thiazolidinecarboxylic acid to the olive leaf extract.
5. The method of claim 4, wherein the ratio of the oxothiazolidinecarboxylic acid to oleuropein in the olive leaf extract is (0.01-10): 1.
6. the method of claim 5, wherein the oleuropein content of the olive leaf extract is greater than 0.1%.
7. Use of an oxo-thiazolidinecarboxylic acid for the preparation of a formulation for inhibiting the degradation of oleuropein in olive leaf extracts.
8. Use of an oxo-thiazolidinecarboxylic acid for the preparation of a formulation for improving the oxidative discoloration problem of olive leaf extracts.
9. A cosmetic product comprising a composition according to any one of claims 1 to 3.
10. The cosmetic product of claim 9, wherein the composition is present in an amount ranging from 0.01% to 30%.
CN202310405689.5A 2023-04-17 2023-04-17 Stable olive leaf extract composition Pending CN116531289A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310405689.5A CN116531289A (en) 2023-04-17 2023-04-17 Stable olive leaf extract composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310405689.5A CN116531289A (en) 2023-04-17 2023-04-17 Stable olive leaf extract composition

Publications (1)

Publication Number Publication Date
CN116531289A true CN116531289A (en) 2023-08-04

Family

ID=87442661

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310405689.5A Pending CN116531289A (en) 2023-04-17 2023-04-17 Stable olive leaf extract composition

Country Status (1)

Country Link
CN (1) CN116531289A (en)

Similar Documents

Publication Publication Date Title
Peixoto et al. Grape pomace as a source of phenolic compounds and diverse bioactive properties
Wissam et al. Effective extraction of polyphenols and proanthocyanidins from pomegranate’s peel
Maisarah et al. Antioxidant analysis of different parts of Carica papaya
Hanen et al. Interspecific variability of antioxidant activities and phenolic composition in Mesembryanthemum genus
Akinpelu et al. The in vitro antioxidant property of methanolic extract of Afzelia africana (Smith.)
Karima et al. Antioxidant and antimicrobial activities of Plantago major
Haghgoo et al. Antibacterial effects of different concentrations of Althaea officinalis root extract versus 0.2% chlorhexidine and penicillin on Streptococcus mutans and Lactobacillus (in vitro)
Marina et al. Quantification of total phenolic compound and in vitro antioxidant potential of fruit peel extracts.
Tan et al. Protective effects of papaya extracts on tert-butyl hydroperoxide mediated oxidative injury to human liver cells (An in-vitro study)
Wang et al. Physicochemical properties, chemical composition, and antioxidant activity of Dendropanax dentiger honey
Tuan Putra et al. Chemical characterization of ethanolic extract of Butterfly pea flower (Clitoria ternatea)
Bonacci et al. Peracetylation as a strategy to improve oleuropein stability and its affinity to fatty foods
Benslama et al. Phenolic compounds, antioxidant and antibacterial activities of Zizyphus lotus L. leaves extracts
Abdulkadir et al. In vitro antioxidant activity of the ethanolic extract from fruit, stem, and leaf of Solanum torvum
Meechai et al. Antioxidant Properties and Phytochemical Contents of Garcinia schomburgkiana Pierre.
Sani et al. Effects of standardized stem bark extract of Mangifera indica L. in wistar rats with 2, 4-dinitrophenylhydrazine-induced haemolytic anaemia
Nofouzi Study on the antioxidant activity and in vitro antifungal activity of Verbascum speciosum methanolic extract
Umamahesh et al. In vitro anti-oxidant, anti-microbial and anti-inflammatory activities of five Indian cultivars of mango (Mangifera indica L.) fruit peel extracts
CN110446486A (en) Novel antioxidant for the cosmetics containing glycerol alkyl ether and pharmaceutical composition
Ginovyan et al. Antioxidant potential of some herbs represented in Armenian flora and characterization of phytochemicals
Özkan et al. LC-MS/MS analyses of Ziziphora clinopodioides Lam. from Turkey: Antioxidant, anticholinesterase, antimicrobial and, anticancer activities
Bodoira et al. Impact of storage conditions on the composition and antioxidant activity of peanut skin phenolic‐based extract
Torshabi et al. Preparation of Citrus reticulata peel nano‐encapsulated essential oil and in vitro assessment of its biological properties
Kumari et al. Characterization of phenolic compounds in petal extracts of rose
Brahmi et al. Effect of growth stage and solvent extract on the antioxidant potential of olive leaves

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination