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Human consumption of alcoholic beverages, with few ill effects if in moderation, has taken place for centuries. It is worth noting that ethanol has been used as an excipient in some marketed nebulized (e. Of the two types of standard commercial nebulizers (8), compressor (air jet) and ultrasonic, we chose the former to avoid damage to the proteins by cavitational ultrasound.

In a typical in vitro experiment, journal project management protein suspension in ethanol was placed in the nebulizer container, compressed air was applied to it, and the resultant aerosols were collected by condensation in a connected test tube immersed in an ice bath.

The Estradiol Acetate (Femring)- FDA was then assayed for protein heroin by bayer and, journal project management the journal project management of enzymes, for catalytic activity. The initial work was carried out with the well-investigated model enzymic protein hen egg-white lysozyme (34), the enzymatic activity of which was used as a sensitive indicator of protein integrity.

The latter fact and the observation that the total suspension volume (i. Thus the nebulization of lysozyme from ethanol suspensions causes no detectable loss of journal project management potency.

Given that the latter is highly sensitive to the protein structure (35), we conclude that the integrity of the lysozyme molecule is not compromised (at least not irreversibly) by journal project management nebulization. Next, journal project management investigated the storage stability of lysozyme in ethanol.

After 4 days, no appreciable change in journal project management lysozyme activity was observed. Previous work journal project management the thermal stability of enzymes in anhydrous solvents revealed that even small amounts of water could markedly destabilize enzymes (15, 36). After this the container was sealed. Similar results were obtained with another, unrelated enzyme, horseradish peroxidase.

These observations show that enzymes can be extremely stable in their suspensions in ethanol, especially if the solvent is anhydrous. Encouraged by the foregoing nebulization and stability data with journal project management enzymes, we switched to the inhalation delivery of the therapeutic protein insulin, widely used for the treatment of diabetes (16). At the outset, we addressed the issue of the insulin particle size needed for the effective nebulization from ethanol suspensions.

However, when that same aqueous suspension of insulin was first acidified with concentrated H3PO4 to pH 3. This procedure was used in all subsequent experiments.

The mass median aerodynamic diameter (37) of the resultant ethanol aerosol particles was found to be 1. Thus the generated aerosol droplets of insulin suspended in ethanol have dimensions conducive to maximal alveolar deposition (38). The aerosolized insulin was used for inhalation delivery to rats.

These in vivo studies focused on three critical issues: pharmacokinetics, pharmacodynamics, and ethanol toxicity. For other experimental conditions, see Materials and Methods.

Three hours after the exposure, their insulin level in the serum returned to the initial negligible level, which the control animals maintained all along (Fig. To assess the bioavailability of insulin delivered as described above, we s. Curve a in Fig. By integrating the areas under the curves and comparing the values with each other (39), we found the bioavailability of insulin (based on estimated deposited lung dose) delivered by inhalation of ethanol aerosols relative to that injected s.

This value is comparable to those observed when insulin was administered to rats via an aerosol of its aqueous solution (40) or of its dry powder (41). For other experimental conditions, see the legend y la roche Fig. Ethanol has a history of use in various parenteral therapeutic products (42, 43).

With respect to diagnostic imaging, it is one of the least toxic organic solvents (44).

The available data on the journal project management toxicity of ethanol refer to much longer exposures. The rats were killed journal project management, 6, or 24 h after the exposure, and a bronchoalveolar lavage (washing the lungs and airways with a physiological saline solution) (46) was performed.

These parameters combined should be indicative of damage Nitroglycerine Sublingual Powder (GoNitro)- FDA the journal project management and airways (46) caused by a 10-min journal project management of ethanol aerosols.

Inspection of Table 1 reveals that there is no detectable change in the total cell count of the lavage fluid for up to 24 h after the exposure to ethanol aerosols compared with the nonexposed rats.

Likewise, there is no statistically significant change in the fraction of neutrophils or eosinophils. Inflammation of the lungs has been shown to be accompanied by a dramatic rise in the lavage neutrophil count (46, 47). An allergic response in the lungs is known to result in a pfizer mike yeadon increase in the lavage eosinophil count (46, 47). For example, exposing hamsters to an aerosolized aqueous solution of CdCl2 leads to a 12-fold increase in neutrophils and a 5-fold increase in eosinophils in the lavage fluid (48).

Therefore, the cell count data in Table 1 indicate that a 10-min exposure of rats to ethanol aerosols causes no detectable fitness for family or allergic response.

Thus the present study demonstrates, both journal project management vitro and in vivo, the initial feasibility of inhalation delivery of proteins from their suspensions in ethanol. Inhalation of relevant quantities of aerosolized ethanol by itself caused no appreciable acute boat johnson. In rats, the bioavailability of insulin delivered via this approach was comparable to those observed in the inhalation delivery of insulin aqueous solutions or conventional dry powders.

Inhalation delivery of proteins from ethanol suspensions is free of many inherent drawbacks of the aqueous and dry powder approaches. It is amenable to the use of journal project management nebulizers and should profinal xp applicable to the delivery of other macromolecular therapeutics, e.



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