WO2021073132A1 - 高纯度神经酸在美白方面的应用及其制备方法 - Google Patents

高纯度神经酸在美白方面的应用及其制备方法 Download PDF

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WO2021073132A1
WO2021073132A1 PCT/CN2020/095723 CN2020095723W WO2021073132A1 WO 2021073132 A1 WO2021073132 A1 WO 2021073132A1 CN 2020095723 W CN2020095723 W CN 2020095723W WO 2021073132 A1 WO2021073132 A1 WO 2021073132A1
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nervonic acid
acid
preparation
formula
crude
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French (fr)
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谈满良
李小冬
杨英士
易武
尤雅莉
李军涛
李雪飞
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南京康齐生物科技有限公司
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00Medicinal preparations containing organic active ingredients
    • A61K31/185Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
    • A61K31/19Carboxylic acids, e.g. valproic acid
    • A61K31/20Carboxylic acids, e.g. valproic acid having a carboxyl group bound to a chain of seven or more carbon atoms, e.g. stearic, palmitic, arachidic acids
    • A61K31/201Carboxylic acids, e.g. valproic acid having a carboxyl group bound to a chain of seven or more carbon atoms, e.g. stearic, palmitic, arachidic acids having one or two double bonds, e.g. oleic, linoleic acids
    • 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
    • A61K8/33Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/36Carboxylic acids; Salts or anhydrides thereof
    • A61K8/361Carboxylic acids having more than seven carbon atoms in an unbroken chain; Salts or anhydrides thereof
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00Drugs for dermatological disorders
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61QSPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00Preparations for care of the skin
    • A61Q19/02Preparations for care of the skin for chemically bleaching or whitening the skin
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42Separation; Purification; Stabilisation; Use of additives
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42Separation; Purification; Stabilisation; Use of additives
    • C07C51/43Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42Separation; Purification; Stabilisation; Use of additives
    • C07C51/47Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption

Definitions

  • the invention relates to the fields of whitening agent products and melanin suppression products, in particular to the application of high-purity nervonic acid in whitening and a preparation method thereof.
  • Nervonic acid (NA for short) was first discovered in the nerve tissue of mammals. It is an important component of the biofilm in the nerve tissue and a symbolic component of the medulla in cerebrosides.
  • Professor Klenk first isolated unsaturated fatty acids with a melting point of 4l°C from the cerebrosides of human and cattle brains, and introduced its molecular formula as C 24 H 46 O 2 .
  • Japanese scholars extracted nervonic acid from shark oil and confirmed it as a cis structure for the first time. For this reason, it is also called shark acid. Nerve acid is recognized worldwide as a health food that can repair and dredge the damaged brain nerve pathways. For this reason, the development and utilization of nerve acid products are gradually developed.
  • domestic methods for extracting and separating nervonic acid from plants include metal salt precipitation, emulsification separation, fatty acid salt column chromatography, solvent crystallization, molecular distillation, multi-stage molecular distillation purification, and molecular distillation and urea inclusion.
  • metal salt precipitation method, emulsification separation method, solvent crystallization method to separate nervonic acid mostly use fats with high nervonic acid content as raw materials, while the content of nervonic acid in plants such as Acer truncatum and Lancai is low, so it is not suitable to directly use these methods.
  • Kind of method At present, methods with advanced technology, high extraction rate, and short time are used, such as: extraction enzyme extraction, CO2 supercritical extraction, ultrasonic-assisted extraction, and microwave-assisted extraction.
  • Common whitening ingredients include Vc, kojic acid, fruit acid, arbutin, placenta, natural plants and herbs, and endothelin antagonists.
  • the mechanism of action includes reduction of melanin; inhibition of melanin formation, promotion of epidermal melanin shedding, and inhibition of TYR , DH ICA oxidase and dopa isomerase activity and other methods inhibit melanin production, block DH I polymerization, repair damaged melanocytes, and maintain their metabolic balance; revitalize and promote cell metabolism, accelerate the decomposition of keratinocytes, etc., However, other health care aspects are not strong.
  • the plant-derived nervonic acid of the present invention overcomes many technical problems such as traditional source deficiency, complex process flow and low content, and at the same time, it takes into account the whitening of the product and increases the effect of brain health care at the same time.
  • Neural acid inhibits the formation of melanin, promotes the shedding of epidermal melanin, inhibits the production of melanin by inhibiting the activities of TYR, DH ICA oxidase and dopa isomerase, and also has the function of promoting cell metabolism and accelerating the decomposition of keratinocytes, and it is absorbed through the skin Korean dramas have the potential to repair and unblock the damaged brain nerve pathways, and have a broad market prospect.
  • the present invention discloses the application of high-purity nervonic acid in whitening and its preparation method.
  • the compound has a good inhibitory effect on the synthesis of black in the human body, and has a good penetration effect on the human epidermis.
  • This product is derived from plants and is prepared by column chromatography to crystallize monomers with a purity of greater than 95%. It has high safety and no toxic side effects. It is a natural whitening product.
  • the pharmaceutical composition comprises a pharmaceutically effective dose of nervonic acid and a pharmaceutically acceptable carrier.
  • the pharmaceutically acceptable carrier is an excipient used in the formulation of the composition.
  • the pharmaceutical composition or whitening cosmetics is used to eliminate dark spots and spots.
  • the content of the nervonic acid in the pharmaceutical composition or whitening cosmetics is 0.1%-99.9%.
  • the above-mentioned preparation method of nervonic acid includes the following steps:
  • step b) After concentrating the post-column liquid of step a), crystallize at low temperature to obtain high-purity crystals.
  • the concentration of dissolved ethanol in step a) is 60-80 v/v%
  • the amount of ethanol used is 2-8 times the amount of crude nervonic acid
  • the dissolution temperature is 60-80°C.
  • the resin in step a) is an anion exchange resin
  • the molecular structure is basic skeleton particles of styrene or acrylic acid series.
  • the concentration in step b) is 3-4 times the amount of crude proneuronic acid, the crystallization temperature is 0-4°C, and the crystallization time is 6-12 hours.
  • the compound of the present invention can be used alone as a melanin production inhibitor, or can be mixed with other compounds, and contains pharmaceutically acceptable pharmaceutical excipients or conventional pharmaceutical carriers. Conventional excipients in the art can be used to discourage
  • the active ingredient of the present invention can be used as a melanin production-inhibiting medicine or whitening cosmetics on the premise that it reacts or does not affect the curative effect of the drug of the present invention.
  • the preparation method of mixing the inhibitor with other compounds can be prepared by conventional preparation methods in the art.
  • the preparation method for mixing inhibitors and other compounds is not limited.
  • Neural acid is directly prepared into preparations, or separately or/and adjuvants are mixed to prepare preparations, and then prepared into preparations according to conventional methods in the art.
  • the dosage of the pharmaceutical composition of the present invention varies according to the subject of administration and the stage of the disease.
  • the compound of the present invention has a good inhibitory effect on the synthesis of black in the human body, and has a good penetration effect when used in the human epidermis.
  • the product is derived from plants and has a purity greater than that prepared by column chromatography crystallization. 95% monomer, high safety, no toxic side effects, at the same time, nervonic acid has obvious inhibitory effect on melanin, it is a natural whitening product.
  • the preparation of extracting high-purity nervonic acid from crude garlic fruit includes the following steps:
  • step b) After concentrating the post-column solution of step a), it is concentrated to 3 times the amount of crude pronervonic acid, the crystallization temperature is 4°C, the crystallization time is 6 hours, the low-temperature crystallization obtains high-purity crystals, and the purity of the obtained nervonic acid is 95.1 %.
  • step b) After concentrating the post-column liquid of step a), it is concentrated to 3 times the amount of crude pronervonic acid, the crystallization temperature is 2°C, the crystallization time is 9 hours, the low-temperature crystallization obtains high-purity crystals, and the purity of the obtained nervonic acid is 95.4 %.
  • the preparation of extracting high-purity nervonic acid from crude rapeseed includes the following steps:
  • step b) After concentrating the post-column liquid of step a), it is concentrated to 4 times the amount of crude pronervonic acid, the crystallization temperature is 0°C, the crystallization time is 12 hours, and the low-temperature crystallization obtains high-purity crystals, and the purity of the obtained nervonic acid is 95.3 %.
  • the cultured B16 cells were inoculated at a density of 1 ⁇ 10 4 cells/mL, and the medium was changed after 24 hours. Add medium containing samples of different mass concentrations, and inoculate three copies of each mass concentration.
  • the control group replaced the sample solution with RPMI-1640 complete medium. After incubating at 37°C and 5% CO 2 for 72 hours, the supernatant was discarded. Add 1 mL of trypsin digestion solution with a mass concentration of 2.5 g ⁇ L -1 to each well and digest for 5 min at room temperature. Add 4mL RPMI-1640 complete medium to stop the digestion, and pipette into a single cell suspension.
  • Inhibition rate [1-(absorbance of sample well/cell density of sample well)/(absorbance of control well/cell density of control well)] ⁇ 100%
  • inhibition rate [(AB)-(CD)]/(AB) ⁇ 100%; where A is the mixture of no sample and tyrosinase at 475nm Measured absorbance; B is the absorbance measured at 475nm for the mixed solution without sample and tyrosinase; C is the absorbance measured at 475nm for the mixed solution with sample and tyrosinase; D is the sample with added sample The absorbance measured at 475nm for the mixed solution without tyrosinase.
  • the concentration of the cell suspension is (7 ⁇ 8) ⁇ 10 3 cells/well. After being attached for 24 hours, add medium containing samples of different mass concentrations. Set 3 multiple holes for one mass concentration. The control group replaced the sample solution with RPMI-1640 complete medium. After incubating at 37°C and 5% CO 2 for 72 hours, the supernatant was discarded.
  • Inhibition rate (1-average absorbance of sample group/average absorbance of control group) ⁇ 100%
  • nervonic acid exhibits a strong inhibitory effect on intracellular tyrosinase activity, and it is mass concentration dependent. It can be seen that the inhibitory effect of grape seed extract on melanin synthesis is achieved by reducing the catalytic activity of tyrosinase.

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Abstract

一种神经酸在制备用于抑制黑色素生成的药物组合物或抑制黑色素生成的美白化妆品中的应用,所述神经酸的纯度达到95%以上,神经酸的结构式如式(1)所示, (I) 上式为式(1)。该化合物对人体的黑色的合成具有很好的抑制作用,而且用于人体表皮具有很好的渗透作用,其来源于植物,通过柱层析结晶的方式制备出纯度大于95%的单体,安全性高,无毒副作用,是一种天然的美白产品。

Description

高纯度神经酸在美白方面的应用及其制备方法 技术领域
本发明涉及美白剂产品、黑色素抑制产品领域,具体涉及高纯度神经酸在美白方面的应用及其制备方法。
背景技术
神经酸(Nervonic acid,简称NA)最早发现于哺乳动物的神经组织,是神经组织中生物膜的重要组成成分,是脑甙中髓质的标志性成分。1925年,Klenk教授首次从人和牛大脑的脑苷中分离出熔点为4l℃的不饱和脂肪酸,并推出其分子式为C 24H 46O 2。1926年日本学者从鲨鱼油中提取出神经酸,并首次确认为顺式结构,为此又称为鲨鱼酸。神经酸是世界公认的能修复疏通受损大脑神经通路的保健食品,为此逐步开拓神经酸的产品的开发和利用。
过去,国内从植物中提取分离神经酸的方法有金属盐沉淀法、乳化分离法、脂肪酸盐柱层析法、溶剂结晶法、分子蒸馏法及多级分子蒸馏提纯和分子蒸馏与尿素包合法相结合等。其中,金属盐沉淀法、乳化分离法、溶剂结晶法分离神经酸多以神经酸含量高的油脂为原料,而元宝枫、遏蓝菜等植物中神经酸含量较低,不适宜直接采用这几种方法。目前,采用技术先进、提取率高、时间短等优点的方法,如:提取酶法提取、CO2超临界萃取法、超声波辅助提取法、微波辅助萃取法等。
美白常见的成分包括Vc、曲酸、果酸、熊果苷、胎盘素、天然植物及草药、内皮素拮抗剂,其作用机理包括,还原黑色素;抑制黑色素形成、促进表皮黑色素脱落,通过抑制TYR、DH ICA氧化酶及多巴异构酶活性等方式抑制黑色素生成,阻断DH I聚合,修复受损黑素细胞,维持其代谢平衡;赋活并促进细胞新陈代谢,加速角质细胞分解等方面,然而其他保健方面不强。
本发明植物来源的神经酸克服了传统的来源不足,工艺流程复杂及含量低等诸多工艺问题,同时在产品功能性问题上兼顾了美白的同时增加了脑部保健的作用。神经酸通过抑制黑色素形成、促进表皮黑色素脱落,通过抑制TYR、DH ICA氧化酶及多巴异构酶活性等方式抑制黑色素生成,同时具有促进细胞新陈代谢,加速角质细胞分解的功能,而且经皮肤吸收韩剧有具有修复疏通受损大脑神经通路,市场前景广阔。
发明内容
要解决的技术问题:本发明公开了高纯度神经酸在美白方面的应用及其制备方法,该化合物对人体的黑色的合成具有很好的抑制作用,而且用于人体表皮具有很好的渗透作用, 本品来源于植物,通过柱层析结晶的方式制备出纯度大于95%的单体,安全性高,无毒副作用,是一种天然的美白产品。
技术方案:神经酸在制备用于抑制黑色素生成的药物组合物或抑制黑色素生成的美白化妆品中的应用,所述神经酸的纯度达到95%以上,神经酸的结构式如式(1)所示,
Figure PCTCN2020095723-appb-000001
上式为式(1)。
优选的,所述药物组合物包含药学上有效剂量的神经酸和药学上可接受的载体。
优选的,所述药学上可接受的载体为组合物中制剂使用的辅料。
优选的,所述药物组合物或美白化妆品用于消除面黑、面斑。
优选的,所述神经酸在药物组合物或美白化妆品中的含量为0.1%-99.9%。
上述的神经酸的制备方法,包括以下步骤:
a)将来源于蒜头果、元宝枫或油菜籽的含量在60-90%的神经酸粗品经过乙醇溶解通过树脂层析,收集柱后液;
b)将步骤a)的柱后液浓缩后,低温结晶获得高纯度晶体。
优选的,步骤a)所述的溶解乙醇的浓度为60-80v/v%,乙醇使用量为神经酸粗品的2-8倍量,溶解温度为60-80℃。
优选的,步骤a)所述的树脂为阴离子交换树脂,分子结构为苯乙烯或者丙烯酸系列的碱性骨架颗粒。
优选的,步骤b)所述的浓缩为原神经酸粗品的3-4倍量,结晶温度为0-4℃,结晶时间为6-12小时。
本发明中的化合物作为黑色素生产抑制剂可以单独使用,也可以与其它化合物混合使用,并含有药学上可接受的药用辅料或常规的药用载体,可采用本领域常规的辅料,以不和本发明活性成分发生反应或不影响本发明药物的疗效为前提,用作抑制黑色素生成的药品或美白化妆品,所述抑制剂与其它化合物混合的制备方法可采用本领域常规的制备方法进行制备。
本发明中,抑制剂与其它化合物混合的制备方法没有限制,神经酸直接做成制剂,或者分别或/和辅料混合后做成制剂,然后按照本领域常规的方法制备成剂。本发明中的药物组合物的 给药剂量根据给药对象及疾病时期不同而改变。
有益效果:本发明中的化合物对人体的黑色的合成具有很好的抑制作用,而且用于人体表皮具有很好的渗透作用,本品来源于植物,通过柱层析结晶的方式制备出纯度大于95%的单体,安全性高,无毒副作用,同时,神经酸对黑色素具有明显的抑制作用,是一种天然的美白产品。
具体实施方式
1、样品的制备
1.1从蒜头果粗品中提取高纯度神经酸的制备,包括以下步骤:
a)将来源于蒜头果的含量在60%的神经酸粗品经过80v/v%乙醇溶解通过树脂层析,乙醇使用量为神经酸粗品的8倍量,溶解温度为60℃,收集柱后液,其中树脂为含有苯乙烯或者丙烯酸系列的碱性骨架颗粒的阴离子交换树脂;
b)将步骤a)的柱后液浓缩后,浓缩为原神经酸粗品的3倍量,结晶温度为4℃,结晶时间为6小时,低温结晶获得高纯度晶体,得到神经酸的纯度为95.1%。
1.2从元宝枫粗品中提取高纯度神经酸的制备,包括以下步骤:
a)将来源于元宝枫的含量在70%的神经酸粗品经过70v/v%乙醇溶解通过树脂层析,乙醇使用量为神经酸粗品的6倍量,溶解温度为70℃,收集柱后液,其中树脂为含有苯乙烯或者丙烯酸系列的碱性骨架颗粒的阴离子交换树脂;
b)将步骤a)的柱后液浓缩后,浓缩为原神经酸粗品的3倍量,结晶温度为2℃,结晶时间为9小时,低温结晶获得高纯度晶体,得到神经酸的纯度为95.4%。
1.3从油菜籽粗品中提取高纯度神经酸的制备,包括以下步骤:
a)将来源于油菜籽的含量在90%的神经酸粗品经过60v/v%乙醇溶解通过树脂层析,乙醇使用量为神经酸粗品的2倍量,溶解温度为80℃,收集柱后液,其中树脂为含有苯乙烯或者丙烯酸系列的碱性骨架颗粒的阴离子交换树脂;
b)将步骤a)的柱后液浓缩后,浓缩为原神经酸粗品的4倍量,结晶温度为0℃,结晶时间为12小时,低温结晶获得高纯度晶体,得到神经酸的纯度为95.3%。
2.黑色素含量的测试:
2.1 B16细胞内黑色素含量的测定:
将培养的B16细胞以密度1×10 4个/mL进行接种,24h后换液。添加含有不同质量浓度样品的培养基,每一质量浓度接种三份。对照组以RPMI-1640完全培养基代替样品溶液。37℃,5%CO 2条件下孵育72h后,弃去上清液。每孔加入质量浓度2.5g·L -1胰蛋白酶消化液1mL于室温下消化5min。加入4mL RPMI-1640完全培养基中止消化,并吹打成单细胞悬液。取0.5 mL作细胞计数,其余细胞悬液于1 500r·min -1离心10min,弃上清液,加入1mL lmol·L -1的NaOH溶液,并在90℃水浴中孵育2h后,在酶标仪490nm处测其吸光度。按下列公式计算样品对黑色素合成的抑制率:
抑制率=[1-(样品孔吸光度/样品孔细胞密度)/(对照孔吸光度/对照孔细胞密度)]×100%
Figure PCTCN2020095723-appb-000002
从上表可知,采用神经酸处理细胞后,对细胞内黑色素的抑制率达到45.56%,且随着浓度的升高,抑制能力变强。
2.2体外酪氨酸酶活性测定:
取不同体积的样品(对照组以磷酸缓冲液(PBS)代替)与酪氨酸酶(100U)的混合液,37℃孵育10min,加入0.003mol·L-多巴反应液1mL,继续在37℃孵育2min,立即在475nm处测吸光度。
酪氨酸酶活性抑制率按下列公式计算:抑制率=[(A-B)-(C-D)]/(A-B)×100%;式中A为未加样品加酪氨酸酶的混合液在475nm处测得的吸光度;B为未加样品和酪氨酸酶的混合液在475nm处测得的吸光度;C为加样品和酪氨酸酶的混合液在475nm处测得的吸光度;D为加样品而未加酪氨酸酶的混合液在475nm处测得的吸光度。
Figure PCTCN2020095723-appb-000003
从上表可知,采用酪氨酸酶进行分析,对酪氨酸酶的抑制率达到53.23%,且随着用量的变多的升高,抑制能力变强。
2.3 B16细胞内酪氨酸酶活性的测定:
将培养的B16单细胞悬液将入24孔板中,细胞悬液的浓度为(7~8)×10 3个/孔,待贴壁24h后,添加含有不同质量浓度样品的培养基,每一质量浓度设3个复孔。对照组以RPMI一1640完全培养基代替样品溶液。37℃,5%CO 2条件下孵育72h后,弃去上清液。用pH=7.4的PBS洗涤2次,每孔加质量分数为1%的辛基酚聚氧乙烯醚(TritonX-100)溶液50uL,迅速置于一80℃冻存30min,随后室温融化使细胞完全破裂,37℃预温5min后加入质量分数为1%的L-DOPA溶液10uL,37℃反应2h,在酶标仪490nm处测其吸光度。按下列公式计算络氨酸 酶活性抑制率:
抑制率=(1-样品组平均吸光度/对照组平均吸光度)×100%
Figure PCTCN2020095723-appb-000004
由上表可知,神经酸表现出较强的细胞内酪氨酸酶活性抑制作用,而且呈质量浓度依赖性。由此可见,葡萄籽提取物对黑色素合成的抑制作用是通过降低酪氨酸酶的催化活性实现的。

Claims (9)

  1. 神经酸在制备用于抑制黑色素生成的药物组合物或抑制黑色素生成的美白化妆品中的应用,所述神经酸的纯度达到95%以上,神经酸的结构式如式(1)所示,
    Figure PCTCN2020095723-appb-100001
    上式为式(1)。
  2. 根据权利要求1所述的应用,其特征在于:所述药物组合物包含药学上有效剂量的神经酸和药学上可接受的载体。
  3. 根据权利要求2所述的应用,其特征在于:所述药学上可接受的载体为组合物中制剂使用的辅料。
  4. 根据权利要求1所述的应用,其特征在于:所述药物组合物或美白化妆品用于消除面黑、面斑。
  5. 根据权利要求1所述的应用,其特征在于:所述神经酸在药物组合物或美白化妆品中的含量为0.1%-99.9%。
  6. 如权利要求1中所述的神经酸的制备方法,其特征在于,包括以下步骤:
    a)将来源于蒜头果、元宝枫或油菜籽的含量在60-90%的神经酸粗品经过乙醇溶解通过树脂层析,收集柱后液;
    b)将步骤a)的柱后液浓缩后,低温结晶获得高纯度晶体。
  7. 根据权利要求4中所述的神经酸的制备方法,其特征在于:步骤a)所述的溶解乙醇的浓度为60-80v/v%,乙醇使用量为神经酸粗品的2-8倍量,溶解温度为60-80℃。
  8. 根据权利要求4中所述的神经酸的制备方法,其特征在于:步骤a)所述的树脂为阴离子交换树脂,分子结构为苯乙烯或者丙烯酸系列的碱性骨架颗粒。
  9. 根据权利要求4中所述的神经酸的制备方法,其特征在于:步骤b)所述的浓缩为原神经酸粗品的3-4倍量,结晶温度为0-4℃,结晶时间为6-12小时。
PCT/CN2020/095723 2019-10-17 2020-06-12 高纯度神经酸在美白方面的应用及其制备方法 WO2021073132A1 (zh)

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