CH494573A - Skin anti-wrinkle composition contg an elastolytic - Google Patents

Skin anti-wrinkle composition contg an elastolytic

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Publication number
CH494573A
CH494573A CH261268A CH261268A CH494573A CH 494573 A CH494573 A CH 494573A CH 261268 A CH261268 A CH 261268A CH 261268 A CH261268 A CH 261268A CH 494573 A CH494573 A CH 494573A
Authority
CH
Switzerland
Prior art keywords
skin
elastolytic
sep
compound
elastin
Prior art date
Application number
CH261268A
Other languages
French (fr)
Inventor
Thuillier Yvonne
Antoine Perrault Marcel
Original Assignee
Rolland Lab A
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 Rolland Lab A filed Critical Rolland Lab A
Publication of CH494573A publication Critical patent/CH494573A/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00Medicinal preparations characterised by special physical form
    • A61K9/0012Galenical forms characterised by the site of application
    • A61K9/0014Skin, i.e. galenical aspects of topical compositions
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/02Inorganic compounds
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/08Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
    • A61K47/10Alcohols; Phenols; Salts thereof, e.g. glycerol; Polyethylene glycols [PEG]; Poloxamers; PEG/POE alkyl ethers
    • 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
    • A61K8/64Proteins; Peptides; Derivatives or degradation products thereof
    • A61K8/66Enzymes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61QSPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00Preparations for care of the skin
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14Hydrolases (3)
    • C12N9/48Hydrolases (3) acting on peptide bonds (3.4)
    • C12N9/50Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
    • C12N9/64Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue
    • C12N9/6421Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue from mammals
    • C12N9/6424Serine endopeptidases (3.4.21)
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14Hydrolases (3)
    • C12N9/48Hydrolases (3) acting on peptide bonds (3.4)
    • C12N9/50Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
    • C12N9/64Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue
    • C12N9/6421Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue from mammals
    • C12N9/6424Serine endopeptidases (3.4.21)
    • C12N9/6435Plasmin (3.4.21.7), i.e. fibrinolysin
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12YENZYMES
    • C12Y304/00Hydrolases acting on peptide bonds, i.e. peptidases (3.4)
    • C12Y304/21Serine endopeptidases (3.4.21)
    • C12Y304/21007Plasmin (3.4.21.7), i.e. fibrinolysin
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00Medicinal preparations containing peptides
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61QSPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00Preparations for care of the skin
    • A61Q19/08Anti-ageing preparations

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Genetics & Genomics (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Medicinal Chemistry (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Biomedical Technology (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Biochemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Dermatology (AREA)
  • Molecular Biology (AREA)
  • Biotechnology (AREA)
  • Microbiology (AREA)
  • Birds (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Cosmetics (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Medicinal Preparation (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Enzymes And Modification Thereof (AREA)

Abstract

Skin anti-wrinkle compositions comprise cosmetic creams, lotions, sprays, and beauty preparations containing 0.01-1% of an elastolytic enzyme isolated from defatted pancreas powder. Depolymerisation of elastine, the complex mucoproteins of the skin, preventing the accompanying wrinkling which occurs with ageing. Useful in various types of skin beauty preparations particularly for women. Pancreas is defatted with acetone and ether and the dry powder is purified by precipitation with 48-55% (NH4)2SO4. After dialysis the product is further purified by precipitation with ethanol. Finally, after solution in M/100 pH 4.7-5.0 acetate buffer, the solution is lyophilised to give the stable enzyme.

Description

  

  
 



  Nouvelle composition cosmétique
 La présente invention concerne une nouvelle composition cosmétique renfermant un composé à activité élastolytique définie par rapport à l'élastine déjà connue auparavant, ladite composition étant destinée à l'application externe, sur la peau humaine, et ses effets étant purement esthétiques.



   La composition selon la présente invention est caractérisée en ce qu'elle contient un composé à activité élastolytique définie par rapport à l'élastine, extraite par exemple des fibres de collagène, et ayant en outre les caractéristiques suivantes: son point isoélectrique est de 9,5 + 0,5; il est peu soluble dans l'eau mais soluble dans les alcalis; il possède un spectre d'absorption en rayons ultraviolets présentant deux pics, à 2200 et à 2800 A respectivement; par migration électrophorétique, le composé présente notamment deux constituants, dont   l'un    a une mobilité plus lente que les gamma globulines et digérant l'élastine et l'autre a la mobilité des   B-1,      p-2    globulines.



   Ce composé actif peut être préparé de préférence par un procédé déjà décrit qui consiste en ce qu'on utilise une poudre de pancréas délipidée obtenue par une extraction classique du pancréas à l'acétone et à l'éther.



  On extrait ensuite le composé enzymatique à activité élastolytique brut à l'aide d'un tampon d'acétate de sodium M/100 à un pH compris entre 4,8 et 5. On précipite ensuite l'extrait ainsi obtenu à l'aide de sulfate d'ammonium utilisé à une concentration comprise entre 48 et 55   O/o.    On filtre, on remet le précipité en suspension et on déminéralise par dialyse.



   Dans ces conditions, on obtient dans ce premier stade un produit impur, insoluble dans l'eau et non homogène à l'électrophorèse. On peut le purifier au moyen de précipitations fractionnées en présence d'un alcool tel que le méthanol et de préférence l'éthanol.



   Dans la première précipitation, lors de laquelle on a utilisé par exemple un alcool à 50   solo,    on peut obtenir un précipité de protéines ne contenant pas de composé à activité élastolytique que   l'on    élimine par filtration; on procède ensuite avantageusement à une deuxième précipitation à l'aide d'alcool à une concentration voisine de   80 "1o    pour obtenir alors un précipité renfermant le composé actif purifié utilisable pour la composition de l'invention.



   En général on centrifuge à froid et on redissout le produit dans un tampon d'acétate de sodium M/100 à un pH compris entre 4,7 et 5 et on lyophilise.



   On peut avantageusement opérer en présence d'ions de calcium qui ont un effet stabilisant sur ce composé enzymatique.



   Les différents stades du procédé se font à une température basse, inférieure à 50 C et de préférence voisine de   -2O    C.



   La   peauvhumaine    normale comprend au niveau du derme un réseau de fibres élastiques assez fines et en proportion équilibrée avec les fibres collagènes. Elles assurent à la peau une certaine souplesse. Au cours du vieillissement. se produit une évolution des tissus, un certain degré d'altération physio-pathologique de ce réseau élastique. La peau prend un aspect chagriné, irrégulier, avec parfois des alternances de zones flasques et de zones   lidurées.   



     L'élastine    et son complexe mucoprotéique, contenant un mucopolysaccharide, semblent davantage polymérisés, en donnant lieu à des compartiments appauvris en eau et la formation d'agrégats riches en concentration   d'élastine.    Les liaisons hydrophobes jouent en effet un rôle important dans la stabilité et la résistance des fibres élastiques.



   Afin de retarder cette évolution normale de la peau humaine au cours du vieillissement, et notamment de combattre l'apparition indésirable de rides, en particulier chez les femmes, on a entrepris l'étude des mécanismes enzymatiques pouvant agir sur la polymérisation  des fibres élastiques et stimuler la biosynthèse tissulaire à titre esthétique.



   On a ainsi constaté que, du fait de leur nature, les fibres élastiques ne peuvent être modifiées que par des acides forts ou des bases fortes que   l'on    ne rencontre pas in vivo. On s'est par la suite orienté vers des agents d'origine naturelle ayant, par des processus catalytiques, une action sur l'élastine. On a observé que la trypsine et la chymotrypsine ne sont capables d'attaquer que quelques liaisons peptidiques situées en bout de chaîne de la molécule tropo-collagène. Seuls les composés à activité élastolytique se sont révélés actifs sur des protéines fibreuses comme le collagène et principalement l'élastine.



   On a trouvé que le composé élastolytique précité peut être utilisé sous forme de préparations cosmétiques convenables pour l'application sur la peau du corps et du visage, en particulier pour les traitements esthétiques antirides de la peau du corps et du visage.



   Des compositions selon la présente invention peuvent   etre    obtenues par mélange selon les méthodes connues en elles-mêmes, le composé à activité élastolytique précité étant utilisé en proportions comprises avantageusement entre 0,01 et   1      o/o,    par exemple 0,1   O/o    en poids de la composition finale avec des excipients et bases courants en cosmétologie. Le pH de la composition finale est de préférence neutre à légèrement alcalin; par exemple il est compris entre environ 6,8 à 8.



   En cosmétologie les compositions selon l'invention peuvent être employées sous formes d'onguents, crèmes, pommades, lotions, nébulisats, masques et laits de beauté et autres préparations appropriées pour les soins de beauté et préparations cosmétiques.



   Les compositions cosmétiques selon l'invention renferment en dehors de la substance active les bases courantes pour les préparations cosmétiques précitées. On peut ainsi utiliser des esters d'acides gras supérieurs, des polyéthylène-glycols, la lanoline, le squalane, les paraffines, des agents tensio-actifs anioniques, cationiques, amphotères ou non ioniques, par exemple pour réaliser des émulsions du type huile dans l'eau. On peut aussi réaliser des émulsions du type eau dans l'huile. La composition peut comprendre un agent propulseur pour les nébulisats, des adjuvants divers et des parfums.



   La composition peut également comprendre un stabilisant, de préférence le chlorure de calcium.



   A titre d'exemple on indique ci-après une formule de composition selon l'invention convenable en application externe.



   Exemple
 On prépare un onguent de formule suivante:
Composé à activité élastolytique 10 mg
Chorure de calcium   250 mg   
Polyéthylèneglycols de poids moléculaire
 moyen 400 et 4000, connus dans le com
 merce sous les noms de:
EMI2.1     


<tb>   <SEP> Carbowax <SEP> 400 <SEP>   <SEP> et
<tb>  <SEP> en <SEP>    Carbowax <SEP>       4000 <SEP>         <SEP>       en <SEP>    quantités <SEP> égales <SEP> 100 <SEP> mg
<tb>   a    <SEP> Carbowax <SEP> 4000 <SEP>  
<tb> 
Parfum 0,02
 Le pH est amené à neutralité ou légère alcalinité (environ 6,8 à 8).

 

   Toxicité
 La composition cosmétique de l'exemple précité, utilisée en application locale, n'a donné lieu à aucune réaction allergique ni irritante. L'étude a été effectuée à cet égard sur la souris, le rat et sur la peau humaine. 



  
 



  New cosmetic composition
 The present invention relates to a novel cosmetic composition containing a compound with elastolytic activity defined with respect to the elastin already known before, said composition being intended for external application, to human skin, and its effects being purely aesthetic.



   The composition according to the present invention is characterized in that it contains a compound with elastolytic activity defined with respect to elastin, extracted for example from collagen fibers, and further having the following characteristics: its isoelectric point is 9, 5 + 0.5; it is sparingly soluble in water but soluble in alkalis; it has an ultraviolet ray absorption spectrum with two peaks, at 2200 and 2800 A respectively; by electrophoretic migration, the compound exhibits in particular two constituents, one of which has a mobility slower than gamma globulins and digesting elastin and the other has the mobility of B-1, p-2 globulins.



   This active compound can be prepared preferably by a process already described which consists in using a powder of delipidated pancreas obtained by a conventional extraction of the pancreas with acetone and with ether.



  The crude enzymatic compound with elastolytic activity is then extracted using a buffer of M / 100 sodium acetate at a pH of between 4.8 and 5. The extract thus obtained is then precipitated using ammonium sulfate used at a concentration between 48 and 55 O / o. Filtered, the precipitate is resuspended and demineralized by dialysis.



   Under these conditions, in this first stage, an impure product is obtained, insoluble in water and inhomogeneous on electrophoresis. It can be purified by means of fractional precipitations in the presence of an alcohol such as methanol and preferably ethanol.



   In the first precipitation, in which for example a 50% alcohol was used, it is possible to obtain a protein precipitate not containing any compound with elastolytic activity which is removed by filtration; a second precipitation is then advantageously carried out using alcohol at a concentration in the region of 80 ° -10 to then obtain a precipitate containing the purified active compound which can be used for the composition of the invention.



   In general, the mixture is cold centrifuged and the product is redissolved in a buffer of M / 100 sodium acetate at a pH between 4.7 and 5 and it is lyophilized.



   It is advantageously possible to operate in the presence of calcium ions which have a stabilizing effect on this enzymatic compound.



   The various stages of the process are carried out at a low temperature, below 50 ° C. and preferably close to -2O C.



   Normal human skin comprises a network of fairly fine elastic fibers in the dermis, in a balanced proportion with the collagen fibers. They provide the skin with a certain flexibility. During aging. There is an evolution of the tissues, a certain degree of physio-pathological alteration of this elastic network. The skin takes on a chagrined, irregular appearance, sometimes with alternations of flabby areas and luscious areas.



     Elastin and its mucoprotein complex, containing a mucopolysaccharide, appear to polymerize further, giving rise to water-depleted compartments and the formation of aggregates rich in elastin concentration. Hydrophobic bonds indeed play an important role in the stability and resistance of elastic fibers.



   In order to delay this normal development of human skin during aging, and in particular to combat the undesirable appearance of wrinkles, in particular in women, the study of the enzymatic mechanisms that can act on the polymerization of elastic fibers and to stimulate tissue biosynthesis for aesthetic purposes.



   It has thus been observed that, due to their nature, the elastic fibers can only be modified by strong acids or strong bases which are not encountered in vivo. We then turned towards agents of natural origin having, by catalytic processes, an action on elastin. It has been observed that trypsin and chymotrypsin are only capable of attacking a few peptide bonds located at the end of the chain of the tropo-collagen molecule. Only compounds with elastolytic activity have been shown to be active on fibrous proteins such as collagen and mainly elastin.



   It has been found that the above-mentioned elastolytic compound can be used in the form of cosmetic preparations suitable for application to the skin of the body and of the face, in particular for aesthetic anti-wrinkle treatments of the skin of the body and of the face.



   Compositions according to the present invention can be obtained by mixing according to methods known per se, the aforementioned compound with elastolytic activity being used in proportions advantageously between 0.01 and 1 o / o, for example 0.1 O / o by weight of the final composition with excipients and bases common in cosmetology. The pH of the final composition is preferably neutral to slightly alkaline; for example it is between about 6.8 to 8.



   In cosmetology, the compositions according to the invention can be used in the form of ointments, creams, ointments, lotions, nebulisates, beauty masks and milks and other preparations suitable for beauty care and cosmetic preparations.



   The cosmetic compositions according to the invention contain, apart from the active substance, the bases common to the aforementioned cosmetic preparations. It is thus possible to use esters of higher fatty acids, polyethylene glycols, lanolin, squalane, paraffins, anionic, cationic, amphoteric or nonionic surfactants, for example to produce emulsions of the oil type in the water. It is also possible to produce emulsions of the water-in-oil type. The composition can comprise a propellant for the nebulisates, various adjuvants and perfumes.



   The composition can also include a stabilizer, preferably calcium chloride.



   By way of example, a composition formula according to the invention suitable for external application is indicated below.



   Example
 An ointment of the following formula is prepared:
Compound with elastolytic activity 10 mg
Calcium choride 250 mg
Molecular Weight Polyethylene Glycols
 average 400 and 4000, known in the com
 mercy under the names of:
EMI2.1


<tb> <SEP> Carbowax <SEP> 400 <SEP> <SEP> and
<tb> <SEP> in <SEP> Carbowax <SEP> 4000 <SEP> <SEP> in <SEP> equal quantities <SEP> <SEP> 100 <SEP> mg
<tb> a <SEP> Carbowax <SEP> 4000 <SEP>
<tb>
Perfume 0.02
 The pH is brought to neutral or slight alkalinity (approximately 6.8 to 8).

 

   Toxicity
 The cosmetic composition of the above example, used in local application, did not give rise to any allergic or irritant reaction. The study was carried out in this regard on mice, rats and on human skin.

 

Claims (1)

REVENDICATION CLAIM Composition cosmétique, caractérisée en ce qu'elle contient en mélange un composé à activité élastolytique définie par rapport à l'élastine, et ayant en outre les propriétés suivantes : son point isoélectrique est de 9,5 + 0,5; il est peu soluble dans l'eau, mais soluble dans les alcalis; il possède un spectre d'absorption des rayons ultraviolets présentant deux pics, à 2200 et à 2800 A, respectivement; par migration électrophorétique, le composé présente deux constituants, dont l'un a une mobilité plus lente que les gamma globulines et digérant l'élastine, et l'autre a la mobilité des P-l, ss-2 globulines. Cosmetic composition, characterized in that it contains as a mixture a compound with elastolytic activity defined with respect to elastin, and also having the following properties: its isoelectric point is 9.5 + 0.5; it is sparingly soluble in water, but soluble in alkalis; it has an UV absorption spectrum with two peaks, at 2200 and 2800 A, respectively; by electrophoretic migration, the compound exhibits two constituents, one of which has a slower mobility than gamma globulins and digesting elastin, and the other has the mobility of P-1, ss-2 globulins. SOUS-REVENDICATIONS 1. Composition selon la revendication, caractérisée en ce qu'elle contient entre 0,01 et i O/o en poids du composé actif par rapport à la composition finale. SUB-CLAIMS 1. Composition according to claim, characterized in that it contains between 0.01 and i O / o by weight of the active compound relative to the final composition. 2. Composition selon la revendication, caractérisée en ce que son pH se trouve dans le domaine compris entre la neutralité et une légère alcalinité, en particulier 6,8 à 8. 2. Composition according to claim, characterized in that its pH is in the range between neutrality and a slight alkalinity, in particular 6.8 to 8.
CH261268A 1967-03-07 1968-02-23 Skin anti-wrinkle composition contg an elastolytic CH494573A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR97731A FR1523250A (en) 1967-03-07 1967-03-07 Anti-wrinkle cosmetic compositions
FR97730 1967-03-07

Publications (1)

Publication Number Publication Date
CH494573A true CH494573A (en) 1970-08-15

Family

ID=26174873

Family Applications (1)

Application Number Title Priority Date Filing Date
CH261268A CH494573A (en) 1967-03-07 1968-02-23 Skin anti-wrinkle composition contg an elastolytic

Country Status (8)

Country Link
JP (1) JPS4948517B1 (en)
BE (1) BE711231A (en)
CH (1) CH494573A (en)
DE (1) DE1667890C3 (en)
FR (2) FR1523250A (en)
GB (1) GB1171078A (en)
LU (1) LU55547A1 (en)
NL (1) NL6803151A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU71110A1 (en) * 1974-10-15 1976-11-11
JPS5219720U (en) * 1975-07-31 1977-02-12
JPS5287024U (en) * 1975-12-24 1977-06-29
FR2369844A1 (en) * 1976-11-05 1978-06-02 Montenegro Marina De Skin care compsns. - contains ptyalin extracted from pig pancreas
JPS611612A (en) * 1984-06-14 1986-01-07 Eisai Co Ltd Elastase hair tonic

Also Published As

Publication number Publication date
BE711231A (en) 1968-07-01
JPS4948517B1 (en) 1974-12-21
FR1523250A (en) 1968-05-03
FR250F (en)
DE1667890A1 (en) 1972-03-09
NL6803151A (en) 1968-09-09
DE1667890C3 (en) 1973-10-11
GB1171078A (en) 1969-11-19
DE1667890B2 (en) 1973-03-08
LU55547A1 (en) 1968-05-03

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