USRE32672E - Method for simultaneously cleaning and disinfecting contact lenses using a mixture of peroxide and proteolytic enzyme - Google Patents
Method for simultaneously cleaning and disinfecting contact lenses using a mixture of peroxide and proteolytic enzyme Download PDFInfo
- Publication number
- USRE32672E USRE32672E US07/082,860 US8286087A USRE32672E US RE32672 E USRE32672 E US RE32672E US 8286087 A US8286087 A US 8286087A US RE32672 E USRE32672 E US RE32672E
- Authority
- US
- United States
- Prior art keywords
- peroxide
- enzyme
- solution
- subtilisin
- lenses
- 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.)
- Expired - Lifetime
Links
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/38—Products with no well-defined composition, e.g. natural products
- C11D3/386—Preparations containing enzymes, e.g. protease or amylase
- C11D3/38609—Protease or amylase in solid compositions only
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L12/00—Methods or apparatus for disinfecting or sterilising contact lenses; Accessories therefor
- A61L12/08—Methods or apparatus for disinfecting or sterilising contact lenses; Accessories therefor using chemical substances
- A61L12/12—Non-macromolecular oxygen-containing compounds, e.g. hydrogen peroxide or ozone
- A61L12/124—Hydrogen peroxide; Peroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/0005—Other compounding ingredients characterised by their effect
- C11D3/0078—Compositions for cleaning contact lenses, spectacles or lenses
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/39—Organic or inorganic per-compounds
- C11D3/3942—Inorganic per-compounds
Definitions
- This invention relates to a method and composition for cleaning and disinfecting contact lenses. More specifically, this invention covers the simultaneous cleaning and disinfecting of contact lenses by means of a solution containing a mixture of peroxide and peroxide-active enzymes, particularly proteolytic enymes.
- PMMA polymethylmethacrylate
- Glass and PMMA based contact lenses are also readily disinfected by detergent cleaning means. Mechanical cleaning processes readily remove adhered infectious materials. Secondly, since these types of materials are non-porous, chemical disinfectants can be included in storage and cleaning solutions without absorption of the disinfectant into the lens and leaching of this disinfectant into the eye during wear. Thus, there is minimal concern about the physical removal of infectious agents and the maintaining of sterility by chemical means during storage and in maintaining the sterility of cleaning, wetting and storing solutions.
- a lens is most comfortable on the eye when the surface is wettable by eye fluid and tear solution.
- the lens surface is naturally hydrophilic or treated to make it hydrophilic. This is achieved by means of multiple negative charges, usually carboxylate in form, and neutral groups which provide a hydrophilic environment readily wetted by the fluid layer covering the cornea.
- Such negatively charged hydrophilic surfaces are present not only on the hydrogel lenses but also on more rigid lenses such as the organosiloxane-methacrylate lenses (Polycon® and silicone elastomer based lenses. In this latter category, the silicone elastomer lenses, the hydrophobic surface is coated or otherwise treated to render the surface hydrophilic.
- Proteinaceous materials adsorbs to the hydrophilic lens surface during day-to-day wear.
- the adsorption is so strong that even with lenses such as the rigid polysiloxane/methylmethacrylate copolymers, manual detergent cleaning methods do not adequately remove this accretion.
- hydrogel lenses those materials prepared from hydroxyethylmethacrylate, hydroxyethylmethylmethacrylate, vinylpyrrolidone and glycerolmethacrylate monomers and methacrylic acid or acid esters, and which absorb a significant amount of water, i.e., 35-80 percent water, are so fragile that mechanical cleaning means is not a practical way of removing soilant, particularly the strongly absorbed proteinaceous materials.
- proteolytic enzymes which hydrolyze amide bonds to break proteins down into amino acids and very small polypeptides. These protein fragments are generally water soluble and thus are easily solubilized by the surrounding aqueous environment.
- proteases for cleaning contact lenses. See also U.S. Pat. No. 4,285,738. Enzymes with lipolytic and or mucolytic activity are also of use in discrete amounts with proteolytic enzymes for lens cleaning.
- a second problem with gas permeable contact lenses, especially the hydrogel or high-water contact lenses made from HEMA, VP and GMA monomers, are concerns with disinfecting and maintaining the sterility of the lenses and lens storage solutions.
- a number of methods have been devised for disinfecting lenses, including the use of high temperature, sterile saline solution washes and chemicals, e.g., antimicrobial drugs or oxidation processes.
- Heat has been effective to a substantial degree but has the drawbacks of making additional cleaning more difficult, i.e., denaturization of protein and the solidification of protein and other deposits on the lenses.
- Sterile saline can be used to clean and soak lenses. Such solutions are not always sterile though as certain microbes can live in a saline environment and spores are not totally inactivated by sterile saline solutions.
- drugs heavy metal-based antimicrobials such as thimerisol and trialkylammonium halides and compounds such as benzylalkonium chloride or similar compounds
- drugs heavy metal-based antimicrobials
- compounds such as benzylalkonium chloride or similar compounds
- the characteristics of such drugs which make them good microbiosides also carry the possible phenomena of eye irritability. This phenomena is particularly present with the hydrogel type lens materials since the drug accumulates in the lens and is then released onto the eye during wear.
- Such drugs may cause eye discomfort for some people, sufficient to cause them to seek alternative means for sterilizing lenses.
- contact lenses may be simultaneously cleaned and disinfected by combining in one solution a peroxide for disinfecting and a peroxide-active enzyme for cleaning, particularly a peroxide-active proteolytic enzyme.
- a peroxide for disinfecting and a peroxide-active enzyme for cleaning, particularly a peroxide-active proteolytic enzyme.
- proteinaceous material removed is potentiated several fold by the presence of peroxide and the disinfecting rate is potentiated when the peroxide-active enzyme is present.
- the total result is that in one step, contact lenses can now be cleaned and sterilized more effectively than by independent use of the two components.
- U.S. Pat. No. 3,732,170 relates to a biological cleaning composition containing an enzyme and a source of peroxide, particularly an alkali-metal monopersulfate triple salt.
- the essence of this invention is a process for cleaning "proteinic" blood stains from a material, a laundry aid. This combination is noted to be formulated preferentially with an anionic detergent.
- U.S. Pat. No. 4,155,868 recites a water soluble, effervescent denture cleanser tablet containing an enzyme and an active oxygen compound.
- the essence of this invention is the formulation of a tablet in such a manner as to prevent the premature inactivation of the enzyme by the oxidizing agent during storage.
- this invention relates to a method for the simultaneous cleaning and disinfecting of contact lenses, particularly one having a hydrophilic surface, which method comprises contacting the lenses with a solution comprises of a disinfecting amount of peroxide and an effective amount of peroxide-active proteolytic enzyme for a time sufficient to remove substantially all protein accretions and to disinfect the lenses.
- the concept of combining an enzyme and peroxide, to effect disinfecting and cleaning in one step can be applied to proteolytic, lipolytic and mucolytic enzymes, individually or in combination.
- a peroxide-active enzyme is any enzyme having measurable activity at 3% (w/v) hydrogen peroxide in aqueous solution at standard temperature and pressure as determined by such colorimetric assays as the Azocoll method, Tomarelli, R. M., et al., J. Lab. Clin. Med., 34, 428 (1949), or the dimethyl casein method for determining proteolytic activity as described by Yaun Lin, et al., J. Biol. Chem., 244: (4) 789-793. (1969).
- Enzymes may be derived from any plant or animal source, including microbial and mammalian sources. They may be neutral acidic or alkaline enzymes.
- a proteolytic enzyme will have in part or in total the capacity to hydrolyze peptide amide bonds. Such enzymes may also have some inherent lipolytic and/or amylolytic activity associated with the proteolytic activity.
- Preferred proteolytic enzymes are those which are substantially free of sulfhydryl groups or disulfide bonds, whose presence may react with the active oxygen to the detriment of both the activity of the active oxygen and which may result in the untimely inactivation of the enzyme.
- Metallo-proteases those enzymes which contain a divalent metal ion such as calcium, magnesium or zinc bound to the protein, may also be used.
- a more preferred group of proteolytic enzymes are the serine proteases, particularly those derived from Bacillus and Streptomyces bacteria and Asperigillus molds. Within this grouping, the more preferred enzymes are the Bacillus derived alkaline proteases generically called subtilisin enzymes.
- subtilisin enzymes Reference is made to Deayl, L., Moser, P. W. and Wildi, B. S., "Proteases of the Genus Bacillus. II alkaline Proteases.” Biotechnology and Bioengineering, Vol. XII, pp. 213-249 (1970) and Keay, L. and Moser, P. W., "Differentiation of Alkaline Proteases form Bacillus Species" Biochemical and Biophysical Research Comm., Vol. 34, No. 5, pp. 600-604, (1969).
- subtilisin A and subtilisin B The subtilisin enzymes are broken down into two sub-classes, subtilisin A and subtilisin B.
- subtilisin A grouping are enzymes derived from such species are B. subtilis, B. licheniformis and B. pumilis. Organisms in this sub-class produce little or no neutral protease or amylase.
- the subtilisin B sub-class is made up of enzymes from such organisms as B. subtilis, B. subtilis var. amylosacchariticus B. amyloliquefaciens and B. subtilis NRRL B3411. These organisms produce neutral proteases and amylases on a level about comparable to their alkaline protease production.
- enzymes are, for example, pancreatin, trypsin, collaginase, keratinase, carboxylase, aminopeptidase, elastase, and aspergillo-peptidase.
- a and B pronase E (from S. griseus) and dispase (from Bacillus polymyxa).
- the identification, separation and purification of enzymes is an old art. Many identification and isolation techniques exist in the general scientific literature for the isolation of enzymes, including those enzymes having proteolytic and mixed proteolytic/amylolytic or proteolytic/lipolytic activity.
- the peroxide stable enzymes contemplated by this invention can be readily obtained by known techniques from plant, animal or microbial sources.
- An effective amount of enzyme is to be used in the practice of this invention. Such amount will be that amount which effects removal in a reasonable time (for example overnight) of substantially all proteinaceous deposits from a lens due to normal wear. This standard is stated with reference to contact lens wearers with a history of normal pattern of protein accretion, not the very small group who may at one time or another have a significantly increased rate of protein deposit such that cleaning is recommended every two or three days.
- the amount of enzyme required to make an effective cleaner will depend on several factors, including the inherent activity of the enzyme, the full extent of its synergistic interaction with the peroxide among several factors stand out as pertinent considerations.
- the working solution should contain sufficient enzyme to provide between about 0.001 to 5 Anson units of activity, preferably between about 0.01 and 1 Anson units, per single lens treatment. Higher or lower amounts may be used. Enzyme concentrations lower than these stated here probably will serve to clean the lens if sufficient time is allowed but such time may be so long as to be practically not useful in a usual lens cleaning and disinfecting regimen. Solution with higher activity should effect more rapid cleaning but may involve amounts of material which are too sizeable for practical cleaning purposes.
- Enzyme activity is pH dependent so for any given enzyme, there will be a particular pH range in which that enzyme will function best. The determination of such range can readily be done by known techniques. It is preferred to manipulate the working solution to an optimum pH range for a given enzyme but such is not an absolute requirement.
- the peroxide source may be any one or more compounds which gives active oxygen in solution.
- examples of such compounds include hydrogen peroxide and its alkali metal salts, alkali metal perborate monohydrate and tetrahydrate, alkali metal persulfates, alkali metal carbonate peroxide, diperisophthalic acid, peroxydiphosphate salts and sodium aluminum aminohydroperoxide. Hydrogen peroxide and the sodium salts of perborates and persulfates are most preferred.
- a disinfecting amount of peroxide means such amount as will reduce the microbial burden by one log in three hours. More preferably, the peroxide concentration will be such that the microbial load is reduced by one log order in one hour. More preferred are those peroxide concentrations which will reduce the microbial load by one log unit in 10 minutes or less.
- a single peroxide concentration can not be made to apply to all peroxides as the percentage of active oxygen varies substantially between peroxides.
- a 0.5% weight/volume concentration will meet the first criteria of the preceding paragraph under most circumstances. It is preferred to use 1.0% to 2.0% peroxide, which concentrations reduce the disinfecting and cleaning time over that of the 0.5% peroxide solution. It is most preferred to use a 3% hydrogen peroxide solution through an amount of 10% may be used. No upper limit placed on the amount of hydrogen peroxide which can be used in this invention except as limited by the requirement that the enzyme retains proteolytic activity.
- Additional materials may be added to the formulations, for example, tonicity agents, effervescing agents, stabilizers, binders, buffering agents, enzyme co-factors, disulfide bond reducing agents such as water-soluble mercaptans and salts of sulfites, pyrosulfites and dithionites and the like, agents to inactivate residual peroxide and the like.
- Formulation of peroxide and enzyme may require stabilizing agents to prevent premature inactivation of both components.
- stabilizing agents may be necessary or appropriate to add materials to stabilize the peroxide, particularly against metal-induced catalytic degradation. It may also be appropriate to add buffering agents to these solutions to maintain pH within a particular given range. Salts or other materials such as polyalcohols or the like may be added to modify the tonic value of such solutions.
- a solution of peroxide and enzyme is prepared and the lenses contacted with this solution, preferably by being immersed in the solution.
- the lenses will be left in contact with such solution long enough so that substantially all protein is removed from the lenses surfaces and the lenses are disinfected.
- the method of sequence of combining the essential components to make up the solution which contacts the lenses will vary with the physical characteristics of the component employed; but order of addition is not critical to the practice of this invention. For example, if hydrogen peroxide is used it will not be reasonably possible to formulate a tablet or powder of all the components. Thus when hydrogen peroxide is not the peroxide source, it will be necessary to mix enzyme and other dry ingredients with aqueous peroxide. It is most convenient to formulate the enzyme and other dry components as a powder or tablet and to dissolve such material in a peroxide solution, then introduce the lenses into this solution. The lenses could already be in the peroxide solution when the enzyme is introduced but practical considerations make the first method the preferred one.
- the two essential components may be formulated as separate components in dry or aqueous form. They may be combined in a single tablet or powder or one may be in dry form while the other is manufactured as an aqueous solution.
- the final form will depend in part upon the type of peroxide source used in the formulation. It is anticipated that the powder or tablet form of this invention could also be in an effervescent form to enchance tablet breakup and to enhance the solubility rate of the ingredients. If a granular peroxide is employed, it will be possible to prepare powders and/or tablets from the several components of this invention. Where the peroxide is in solution form, it may be necessary to provide the enzyme from a second source in order to prevent long-term degradation of the enzyme.
- the practice of this invention is not to be limited temperature-wise except by those temperature extremes which would substantially inactivate the proteolytic capability of the enzymes employed. Enzymatic activity is a function of temperature, some enzymes being considerably more labile than others to temperature extremes, particularly temperature increases. Other enzymes are heat stable and remain significantly active at temperatures of 70° C. or higher. Other enzymes retain substantial amounts of activity at or just above the freezing temperature of water. While the preferred temperature range for practicing this invention is between 20° and 37° C., particularly about 22°-25° C., it may be possible to practice this invention with certain peroxide-active enzymes in the temperature range between about 5° C. to 100° C.
- One embodiment of this invention is to prepare a room temperature solution of enzyme and peroxide and to place this solution, along with the contact lens, in a contact lens heat disinfecting unit and run the unit through its the normal heat cycle. This is but one example of the heat variable aspects of this invention.
- certain components may be separately prepared in a manner to effect the timed release of that component or to prevent interaction of component 1 with component 2 during tablet and powder preparation and subsequent storage.
- certain components may be separately prepared in a manner to effect the timed release of that component or to prevent interaction of component 1 with component 2 during tablet and powder preparation and subsequent storage.
- solutions or powders may contain agents for detoxifying residual peroxide as part of the overall process of cleaning, disinfecting and ultimately the removal of residual peroxide.
- Enzymes which catalyze the conversion of peroxides to oxygen and water can be included in these formulations to remove residual peroxide in anticipation of inserting the lens back into the eye.
- catalases organic enzymes which catalyze the degradation of peroxides, can be incorporated into tablets and powders, particularly in time-release form.
- metals such as the heavy metal transition elements which catalyze the conversion of peroxide to oxygen and water, can be included in a powder or tablet formulation, again preferably in some delayed release form to provide a method for reducing to a non-toxic level any residual peroxide remaining in the solution after a given time interval.
- transition metal catalysts for decomposing peroxides in a contact lens disinfecting solution is disclosed in U.S. Pat. No. 3,912,451, which information and technology is incorporated herein by reference as if set forth in full herein.
- the subtilisin A was obtained from Nova Industries of Denmark.
- the lenses were divided into four groups of five. One group was treated 3% hydrogen peroxide. A second group was treated with the Subtilisin A containing formulation (133.4 mg. 0.4 mg subtilisin A) in 10 ml of a commercial saline product (Lensrins® made and sold by Allergan Pharmaceuticals, Inc.). A third group was treated with the Subtilisin A tablet dissolved in 10 ml of 3% hydrogen peroxide and the fourth group was treated with a 3% hydrogen peroxide (10 ml) containing one papain enzyme tablet (146.8 mg).
- the lenses were allowed to soak for 3.5 hours. Then each group of lenses was treated appropriately to remove test solution and examined under a microscope to determine the extent of protein removal. The percent surface cleaned equaled the percent of the surface not covered by a protein film at 100X. The results are presented below.
- subtilisin and 3% hydrogen peroxide cleaned between 50 and 70% of the contact lens surface area were essentially nil, subtilisin and 3% hydrogen peroxide cleaned between 50 and 70% of the contact lens surface area.
- subtilisin A alone without peroxide cleaned between 15 and 30% of the lens surface while in comparison, subtilisin A with 3% peroxide cleaned between 50 and 70% of the lens surface.
- Subtilisin A and peroxide was approximately twice as effective in its cleaning capacity in comparison with subtilisin without peroxide.
- pancreatin-containing enzyme tablet effected substantial cleaning while the peroxide alone and the enzyme alone had no detectable protein removing effect in the 8 hours of soaking time used here.
- Hydrocurve® lenses were coated with lysozyme as per Example 1.
- the subtilisin tablet formulation used here was the same as in Example 1 except that the N-acetylcysteine was removed.
- Five different levels of hydrogen peroxide were used, beginning at a concentration of 0.5% by weight/volume.
- the control was the tablet without peroxide with the tonicity value adjusted to approximately that of the 0.5% peroxide/enzyme solution with sodium chloride.
- the pH was adjusted to between about 9.0-9.03 in each solution with hydrochloric acid.
- Five lenses were treated for three hours at room temperature with 10 ml of each solution. The amount of protein (percentage) removed from the lens surface is given in Table I.
- subtilisin A (given in Example I) on the antimicrobial activity of hydrogen peroxide when dissolved in 3% hydrogen peroxide (Lensan A. Allergan Pharmaceuticals, Inc.) was tested against the panel of micro-organisms required by the U.S. FDA guidelines for testing contact lens solutions for disinfective efficacy. Standard culture methods, harvest and quantitative microbiological analysis techniques were used. The organisms used were S. marcescens. ATCC 14756 or 14041: S. aureus, ATCC 6538: P. aeruginosa, ATCC 9027 or 15442: E. coli, ATCC 8739, C. albicans, ATCC 10231 and A. niger. ATCC 16404. A 133.4 mg tablet of the subtilisin A formulation (0.04 mg) given in Example 1 was used.
- the control an enzyme tablet in saline, showed no antimicrobial activity over a 24 hour period.
- Table II lists the average kill rates for the data presented in Table I.
- micro-organisms were prepared by standard microbiological techniques. Each sample was tested in duplicate. As a first step in the assay, 10 ml of 3% hydrogen peroxide was pipetted into screw-cap test tubes. Into selected tubes was added one tablet of subtilisin A, whose composition is described in Example 1. The subtilisin-containing tubes were vortexed for approximately 2 minutes to dissolve the subtilisin tablet. Immediately the challenge organism was added to the tube. After a predetermined contact time interval, survivors were quantified in CFU/ml.
- a D-value was calculated by extrapolation from kill curves using an aerobic plate count method. This method worked essentially as follows: An aliquot of test solution was removed immediately after the predetermined contact interval, divided in half and dispersed into two test tubes containing neutralizer media. A serial ten-fold dilution of the neutralizer media was prepared in a manner to compensate for the expected level of recovery. For low level recovery, a small aliquot was transferred directly onto a neutralizer agar plate. For the other three serial dilution tubes, an equal volume of sample was placed on neutralizer agar plates. All plates were incubated at 35°-37° C. for 2-7 days, or longer if required.
- subtilisin A tablet described in Example 1 and trypsin was determined at different hydrogen peroxide concentrations using the Modified Azocoll method "Sigma Catalog”. Baker Chemical Company, 30% hydrogen peroxide was used. Appropriate dilutions were made with a 0.2M borate buffer at about pH 8.4. Azocoll substrate and trypsin were obtained from Sigma Corporation.
- Peroxide was first diluted with buffer to the appropriate concentrations.
- One enzyme tablet was dissolved in 10 ml of buffer to which had been added 50 mg of Azocoll substrate.
- One ml of this solution was then added to each of the peroxide concentrations, the enzyme/substrate buffer solution being the control.
- the reaction was run at room temperature for 2 minutes, then quenched with 2 ml of 10% trichloroacetic acid, which precipitated the enzyme. Residual color measurements were measured at 520 nm. Subtilisin results are given in Table IV, trypsin results in Table V.
- Table IV indicates that subtilisin A is active in Azocoll assay throughout a broad range of peroxide concentrations. The activity at 30% peroxide is approximately the same as at the 8% concentration. Enzyme activity for subtilisin A apears to be saturated at hydrogen peroxide concentrations between 2-6%. Table V indicates that trypsin is active in hydrogen peroxide.
- Hydrocurve II® lenses were coated with heat-denatured lysozyme as per the procedure described in Example 1.
- the following solutions based on subtilisin A (Novo Industries, Denmark) and sodium perborate were prepared to test the combined effects of perborate as a source of peroxide on the proteolytic activity of subtilisin A.
- Each treatment was done in a 10 ml volume.
Abstract
Description
______________________________________ Ingredient Percentage (w/w) ______________________________________ Papain Tablet Sodium Borate, Dihydrate 13.03% Sodium Carbonate 21.25% Polyethylene glycol 3350 2.74% Papain 6.28% Tartaric Acid 13.71% L-Cysteine HCL 6.86% EDTA 5.04% Sodium Chloride 30.64% Subtilisin A Tablet Sorbitol 29.99% N--acetylcysteine 22.49% Sodium Carbonate 38.98% Polyethylene glycol 3350 3.00% Subtilisin A 0.30% Tartaric Acid 5.24% ______________________________________
______________________________________ 3% Hydrogen Peroxide* % SURFACE LENS CLEANED ______________________________________ A1 0 A2 1 A3 0 A4 0 A5 1 ______________________________________ SUBTILISIN A/Saline SUBTILISIN A/3% H.sub.2 O.sub.2 * % SURFACE % SURFACE LENS CLEANED LENS CLEANED ______________________________________ B1 30 C1 50 B2 20 C2 60 B3 25 C3 70 B4 15 C4 60 B5 30 C5 50 ______________________________________ PAPAIN/3% H.sub.2 O.sub.2 * % SURFACE LENS CLEANED ______________________________________ E1 0 E2 0 E3 0 E4 0 E5 0 ______________________________________ *Oxysept ® 3% Hydrogen peroxide solution marketed by Allergan Pharmaceuticals Inc.
______________________________________ 3% Hydrogen Peroxide % Surface Lens Cleaned ______________________________________ A1 0 A2 0 A3 0 A4 0 A5 0 ______________________________________ Pancreatin/Peroxide Solution Pancreatin/Normal Saline % Surface % Surface Lens Cleaned Lens Cleaned ______________________________________ B1 90 C1 0 B2 85 C2 0 B3 85 C3 0 B4 90 C4 0 B5 80 C5 0 ______________________________________
TABLE I ______________________________________ Effects of Peroxide Concentration on Cleaning Efficacy Enzyme % peroxide % Lens Conc. pH Tonicity Weight/vol. Cleaning ______________________________________ A 0.04 mg/ml 9.025 318 mOsm/kg 0 9.0 (5.5) B 0.04 mg/ml 9.086 330 mOsm/kg 0.5% 44.0 (8.9) C 0.04 mg/ml 9.016 390 mOsm/kg 1.0% 78.0 (2.7) D 0.04 mg/ml 9.022 643 mOsm/kg 1.5% 87.0 (2.7) E 0.04 mg/ml 9.023 796 mOsm/kg 2.0% 94.0 (4.2) F 0.04 mg/ml 9.016 932 mOsm/kg 2.5% 97.0 (2.7) ______________________________________
TABLE I ______________________________________ COMPARISON OF EXTRAPOLATED D-VALUES* IN MINUTES Study I Study II 3% H.sub.2 O.sub.2 3% H.sub.2 O.sub.2 ORGANISMS 3% H.sub.2 O.sub.2 + SUB. A 3% H.sub.2 O.sub.2 + SUB. A ______________________________________ S. marcescens 2.5 1.7 3.5 1.3 S. aureaus 4.0 3.0 4.0 2.0 p. aeruginosa 0.3 0.5 0.3 0.1 E. coli 2.5 0.9 1.7 0.2 C. albicans 36.5 13.0 15.0 9.0 A. niger 9.5 11.6 6.0 6.0 ______________________________________ *D-valve is the time required to reduce a microbial challenge of 5 · 10.sup.6 organism per ml by 90% or 1 logarithm
TABLE II ______________________________________ AVERAGE KILL RATES (D-VALUES) IN MINUTES AT ROOM TEMPERATURE ORGANISMS 3% H.sub.2 O.sub.2 3% H.sub.2 O.sub.2 /SUB. A ______________________________________ S. marcescens 3.0 1.5 E. coli 2.1 0.6 P. aeruginosa 0.3 0.3 S. aureus 4.0 2.5 C. albicans 26.0 11.0 A. niger 8.0 9.0 ______________________________________
TABLE III ______________________________________ Extrapolated Kill Rates (D-valves) of 3% Hydrogen Peroxide (Oxysept I) With and Without Subtilisin Without With Organism and ID # Subtilisin Subtilisin ______________________________________ (1) USP XXI Panel Serratia marcescens. ATCC #14756 1.4 min. 1.0 min. Staphylococcus aureaus. ATCC #6538 3.4 min. 2.1 min. 3.2 min. 2.6 min. Pseudomonas aeruginosa. ATCC #9027 0.2 min. 0.2 min. Escherichia coli. ATCC #8739 1.0 min. 0.3 min. Candida albicans. ATCC #10231 20.0 min. 13.0 min. Aspergillus niger. ATCC #16404 10.0 min. 8.0 min. (2) "Soft Lens" Panel (FDA) Serratia marcescens. ATCC #14041 1.7 min. 1.5 min. Staphylococcus epidermidis. 0.8 min. 1.5 min. ATCC #17917 0.4 min. 1.0 min. Pseudomonas aeruginosa. ATCC #15442 0.6 min. 0.3 min. Aspergillus fumigatus. ATCC #10894 13.5 min. 2.5 min. Candida albicans. ATCC #10231 20.0 min. 13.0 min. (3) Various Isolates Klebsiella pneumoniae. ATCC #13883 1.1 min. 0.6 min. Pseudomonas cepacia. ATCC #17765 0.4 min. 0.2 min. Proteus mirabilis. CSULB/VA 1.2 min. 1.0 min. 1.3 min. 0.9 min. Proteus vulgaris. ATCC #17313 0.4 min. 0.3 min. Candida parapsilosis. PM 4064 63.0 min. 55.0 min. Penicillium sp. (Aqua Tar isolate II) 2.5 min. 2.1 min. ______________________________________
TABLE IV ______________________________________ Lensan A Oxysept I (Data From (Data From Organism Table II) Table III) AO Sept ______________________________________ Serratia marcescens 50% 29% 88% Escherichia coli 71% 70% 90% Pseudomonas aeruginosa 0 0 20% Staphylococcus aureus 38% 28% 60% Candida albicans 58% 35% 33% Aspergillus niger 0% 20% 32% ______________________________________
TABLE IV ______________________________________ Subtilisin Activity in Hydrogen Peroxide % H.sub.2 O.sub.2 OD 520 ______________________________________ 0 0.27 1 0.39 2 0.57 3 0.56 4 0.66 4.5 0.56 5 0.68 6 0.68 8 0.90 30 0.91 ______________________________________
TABLE V ______________________________________ *Trypsin Activity in Hydrogen Peroxide % H.sub.2 O.sub.2 OD 520 ______________________________________ 03 .5 30 .6 ______________________________________ *10 mg of tryspin powder were added to the H.sub.2 O.sub.2 solution.
TABLE VI ______________________________________ Comparative Cleaning of Enzyme With and Without Peroxide Average % Solution Surface Cleaned ______________________________________ A 9.0 ± 5.6 B 0 C 30.0 ± 12.2 ______________________________________
Claims (10)
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US07/082,860 USRE32672E (en) | 1985-09-09 | 1987-08-04 | Method for simultaneously cleaning and disinfecting contact lenses using a mixture of peroxide and proteolytic enzyme |
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US07/082,860 USRE32672E (en) | 1985-09-09 | 1987-08-04 | Method for simultaneously cleaning and disinfecting contact lenses using a mixture of peroxide and proteolytic enzyme |
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