GB2251381A - Diagnostic compositions for assessment of pancreatic insufficiency - Google Patents
Diagnostic compositions for assessment of pancreatic insufficiency Download PDFInfo
- Publication number
- GB2251381A GB2251381A GB9126224A GB9126224A GB2251381A GB 2251381 A GB2251381 A GB 2251381A GB 9126224 A GB9126224 A GB 9126224A GB 9126224 A GB9126224 A GB 9126224A GB 2251381 A GB2251381 A GB 2251381A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fluorescein
- mannitol
- composition according
- saccharide
- 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.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 36
- 208000035467 Pancreatic insufficiency Diseases 0.000 title claims abstract description 13
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims abstract description 33
- 229930195725 Mannitol Natural products 0.000 claims abstract description 33
- 239000000594 mannitol Substances 0.000 claims abstract description 33
- 235000010355 mannitol Nutrition 0.000 claims abstract description 33
- GNBHRKFJIUUOQI-UHFFFAOYSA-N fluorescein Chemical compound O1C(=O)C2=CC=CC=C2C21C1=CC=C(O)C=C1OC1=CC(O)=CC=C21 GNBHRKFJIUUOQI-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000012071 phase Substances 0.000 claims abstract description 10
- 239000000194 fatty acid Substances 0.000 claims abstract description 9
- MYTRGBGGRICZGN-UHFFFAOYSA-N (6'-dodecanoyloxy-3-oxospiro[2-benzofuran-1,9'-xanthene]-3'-yl) dodecanoate Chemical compound O1C(=O)C2=CC=CC=C2C21C1=CC=C(OC(=O)CCCCCCCCCCC)C=C1OC1=CC(OC(=O)CCCCCCCCCCC)=CC=C21 MYTRGBGGRICZGN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229940043045 fluorescein dilaurate Drugs 0.000 claims abstract description 7
- 239000008346 aqueous phase Substances 0.000 claims abstract description 6
- 150000001720 carbohydrates Chemical class 0.000 claims description 19
- 239000000839 emulsion Substances 0.000 claims description 13
- -1 fluorescein ester Chemical class 0.000 claims description 7
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 claims description 6
- 241001558496 Talpa caeca Species 0.000 claims description 6
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 claims description 6
- 210000004347 intestinal mucosa Anatomy 0.000 claims description 5
- 210000002784 stomach Anatomy 0.000 claims description 5
- 230000009056 active transport Effects 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 claims description 4
- JCQLYHFGKNRPGE-FCVZTGTOSA-N lactulose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 JCQLYHFGKNRPGE-FCVZTGTOSA-N 0.000 claims description 4
- 229960000511 lactulose Drugs 0.000 claims description 4
- PFCRQPBOOFTZGQ-UHFFFAOYSA-N lactulose keto form Natural products OCC(=O)C(O)C(C(O)CO)OC1OC(CO)C(O)C(O)C1O PFCRQPBOOFTZGQ-UHFFFAOYSA-N 0.000 claims description 4
- SHZGCJCMOBCMKK-UHFFFAOYSA-N D-mannomethylose Natural products CC1OC(O)C(O)C(O)C1O SHZGCJCMOBCMKK-UHFFFAOYSA-N 0.000 claims description 3
- SHZGCJCMOBCMKK-JFNONXLTSA-N L-rhamnopyranose Chemical compound C[C@@H]1OC(O)[C@H](O)[C@H](O)[C@H]1O SHZGCJCMOBCMKK-JFNONXLTSA-N 0.000 claims description 3
- PNNNRSAQSRJVSB-UHFFFAOYSA-N L-rhamnose Natural products CC(O)C(O)C(O)C(O)C=O PNNNRSAQSRJVSB-UHFFFAOYSA-N 0.000 claims description 3
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 claims description 3
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims 1
- 230000004204 exocrine pancreatic function Effects 0.000 claims 1
- 210000002700 urine Anatomy 0.000 abstract description 9
- 239000003921 oil Substances 0.000 abstract description 8
- 235000019198 oils Nutrition 0.000 abstract description 8
- 238000002405 diagnostic procedure Methods 0.000 abstract description 5
- 235000019864 coconut oil Nutrition 0.000 abstract description 3
- 239000003240 coconut oil Substances 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000007764 o/w emulsion Substances 0.000 abstract description 2
- 239000003550 marker Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 201000003883 Cystic fibrosis Diseases 0.000 description 6
- 108090000790 Enzymes Proteins 0.000 description 5
- 102000004190 Enzymes Human genes 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000009472 formulation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000013589 supplement Substances 0.000 description 4
- 229930091371 Fructose Natural products 0.000 description 3
- 239000005715 Fructose Substances 0.000 description 3
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 3
- 239000002775 capsule Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000787 lecithin Substances 0.000 description 3
- 235000010445 lecithin Nutrition 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000002485 urinary effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- 244000068988 Glycine max Species 0.000 description 2
- 235000010469 Glycine max Nutrition 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 239000002552 dosage form Substances 0.000 description 2
- 230000029142 excretion Effects 0.000 description 2
- 230000037406 food intake Effects 0.000 description 2
- 239000007903 gelatin capsule Substances 0.000 description 2
- 229940067606 lecithin Drugs 0.000 description 2
- 239000004530 micro-emulsion Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 210000000496 pancreas Anatomy 0.000 description 2
- 210000001819 pancreatic juice Anatomy 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000008247 solid mixture Substances 0.000 description 2
- 229910002016 Aerosil® 200 Inorganic materials 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- 108020000290 Mannitol dehydrogenase Proteins 0.000 description 1
- 206010033645 Pancreatitis Diseases 0.000 description 1
- 102000000019 Sterol Esterase Human genes 0.000 description 1
- 108010055297 Sterol Esterase Proteins 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229940075614 colloidal silicon dioxide Drugs 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000001079 digestive effect Effects 0.000 description 1
- 210000002249 digestive system Anatomy 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 210000003020 exocrine pancreas Anatomy 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 230000002496 gastric effect Effects 0.000 description 1
- 230000000762 glandular Effects 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000000968 intestinal effect Effects 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 239000012669 liquid formulation Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 229930027945 nicotinamide-adenine dinucleotide Natural products 0.000 description 1
- BOPGDPNILDQYTO-NNYOXOHSSA-N nicotinamide-adenine dinucleotide Chemical compound C1=CCC(C(=O)N)=CN1[C@H]1[C@H](O)[C@H](O)[C@@H](COP(O)(=O)OP(O)(=O)OC[C@@H]2[C@H]([C@@H](O)[C@@H](O2)N2C3=NC=NC(N)=C3N=C2)O)O1 BOPGDPNILDQYTO-NNYOXOHSSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000000424 optical density measurement Methods 0.000 description 1
- 230000004203 pancreatic function Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 230000003019 stabilising effect Effects 0.000 description 1
- 235000021193 standardized breakfast Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000009747 swallowing Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 150000003626 triacylglycerols Chemical class 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/001—Preparation for luminescence or biological staining
- A61K49/0013—Luminescence
- A61K49/0017—Fluorescence in vivo
- A61K49/0019—Fluorescence in vivo characterised by the fluorescent group, e.g. oligomeric, polymeric or dendritic molecules
- A61K49/0021—Fluorescence in vivo characterised by the fluorescent group, e.g. oligomeric, polymeric or dendritic molecules the fluorescent group being a small organic molecule
- A61K49/0041—Xanthene dyes, used in vivo, e.g. administered to a mice, e.g. rhodamines, rose Bengal
- A61K49/0043—Fluorescein, used in vivo
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/001—Preparation for luminescence or biological staining
- A61K49/0013—Luminescence
- A61K49/0017—Fluorescence in vivo
- A61K49/005—Fluorescence in vivo characterised by the carrier molecule carrying the fluorescent agent
- A61K49/0052—Small organic molecules
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/001—Preparation for luminescence or biological staining
- A61K49/0063—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres
- A61K49/0069—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres the agent being in a particular physical galenical form
- A61K49/0076—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres the agent being in a particular physical galenical form dispersion, suspension, e.g. particles in a liquid, colloid, emulsion
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/22—Echographic preparations; Ultrasound imaging preparations ; Optoacoustic imaging preparations
- A61K49/222—Echographic preparations; Ultrasound imaging preparations ; Optoacoustic imaging preparations characterised by a special physical form, e.g. emulsions, liposomes
Abstract
An emulsified diagnostic composition for detecting pancreatic insufficiency comprises an oil phase dispersed in a continuous aqueous phase, the oil phase having dissolved therein a di-fatty acid ester of fluorescein e.g. fluorescein dilaurate is dissolved in coconut oil and converted into an oil-in-water emulsion in the presence of a mannitol to yield a composition which is administered orally. In the diagnostic test fluorescein and mannitol are excreted in the urine and the ratio of recovered fluorescein and mannitol allows for the detection of pancreatic insufficiency without the need for control experiments.
Description
DIAGNOSTIC COMPOSITIONS FOR
ASSESSMENT OF PANCREATIC INSUFFICIENCY
This invention relates to diagnostic compositions and method for detecting pancreatic insufficiency.
Identification of pancreatic insufficiency is a useful tool in diagnosis of a variety of diseases, including pancreatitis and cystic fibrosis. One test which has been widely used for routine detection of pancreatic insufficiency involves the administration of fluorescein dilaurate (herein referred to as FDL) When this compound comes into contact with pancreatic juices it is broken down by pancreas-specific cholesterol ester hydrolase into fluorescein and two molecules of lauric acid. The coloured, water-soluble fluorescein is absorbed and excreted in the urine. If the patisnt's urine is collected over a ten hour period, and the fluorescein content determined, this provides an indirect measure of glandular output of the exocrine pancreas. This procedure is described, for example in Barry et al, The
Lancet 1982, Vol. 2, pages 742 to 744.
One disadvantage which is inherent in the abovedescribed pancreolauryl test is that it requires to be carried out over a two day period, since the amount of fluorescein which is excreted must be compared with the amount excreted when an equivalent amount of nonesterified fluorescein is administered to the patient.
This control test enables the physician to compensate for any individual absorption or excretion characteristics which could interfere with the result.
Thus, while effective and suitable for routine diagnostic testing, the pancreolauryl test does have two disadvantages, namely, that it is necessary to carry out a control test and secondly the whole of the urine excreted by the patient after administration of the diagnostic composition must be carefully collected.
One aspect of the present invention is based upon the discovery that by incorporating a particular type of permeability marker in the diagnostic composition, it becomes no longer necessary to carry out a control test, since determination of the marker simultaneously with determination of the fluorescein enables the technician or physician to compensate for differences in absorption of the active materials and excretion of the fluorescein and permeability marker by individual patients.
According to one aspect of the present invention there is provided a diagnostic composition which comprises a di-fatty acid ester of fluorescein and a non-toxic water-soluble substance, such as a saccharide, which is resistant to break-down within the stomach and does not take part in any active transport system across the intestinal mucosa.
Preferably, the di-fatty acid ester is fluorescein dilaurate (hereinafter referred to as FDL), since this is readily broken down by the enzyme present in pancreatic juices produced by a healthy pancreas. Preferably the saccharide is a saccharide such as mannitol, lactulose, rhamnose, xylose or fructose of which mannitol is most preferred. Mannitol and lactulose have the particular property that they are highly resistant to break down in the stomach and absorption through the intestinal mucosa seems to be substantially passive. In other words, the transport of the saccharide through the intestinal wall does not seem to involve any reaction with any other material in the digestive system.
Preferably, the saccharide, e.g. the mannitol, is present in the diagnostic composition in a molar excess compared with the FDL. Preferably, the molar ratio of
FDL to mannitol is from 1;5 to 1:100, more preferably 1;10 to 1:60, e.g. 1:50.
Although various dosage forms of the diagnostic test kits may be used, e.g. encapsulated compositions or tabletted solid compositions, such dosage forms are usually unsuitable for children (including neonates) or indeed for adult patients who have swallowing difficulties. However, because the fluorescein fatty acid ester is water-insoluble, addition of the marker compound to a liquid feed, such as milk, or a watery drink is not possible.
According to a further aspect of the present invention, there is provided an emulsified diagnostic composition for detecting pancreatic insufficiency which comprises an oil phase dispersed in a continuous aqueous phase, the oil phase having dissolved therein a di-fatty acid ester of fluorescein.
In a preferred form of the invention as applied to liquid formulations, there is provided an emulsified diagnostic composition for detecting pancreatic insufficiency which comprises an oil phase dispersed in an aqueous phase, the oil phase having a di-fatty acid ester of fluorescein dissolved therein and the composition including a saccharide which is resistant to breakdown within the stomach and which does not take part in any active transport system across the intestinal mucosa.
Emulsions prepared in accordance with the invention may be readily added to an infant's drink and an accurate pancreatic insufficiency assessment carried out. In the case of emulsions which additionally contain a saccharide or other metabolic resistant second marker, no control test need, of course, be carried out.
The emulsions are prepared by dissolving the fluorescein di-fatty acid ester (preferably the dilaurate) in a suitable oil phase. Triglycerides have been found suitable, especially those of medium chain length. One specific example is a fractionated coconut oil obtainable under the trade name 'Miglyol 812t from dynamic Nobel.
These dissolve the fluorescein ester without presenting absorption problems to patients suffering from cystic fibrosis.
Having dissolved the fluorescein di-ester in the triglyceride, an oil-in-water emulsion is formed by dispersing the triglyceride as fine droplets in the aqueous phase. Where a saccharide is present, this may be pre-dissolved in the water. An emulsion is preferably formed by use of ultrasonic energy, although other dispersing methods may be used to obtain emulsion homogenisation. Ultrasonic dispersion has the advantage that an extremely fine dispersion of oil droplets is formed in the aqueous phase. This 'micro-emulsion' system enhances the physical stability of the emulsion, important in paediatric formulations, where the choice of acceptable emulsifiers is limited. Moreover, microemulsions require little effort to form an homogenous mixture when added to an infant drink. Suitable stabilising surfactants include lecithin, e.g. soya bean lecithins which are obtainable from Lipoid K.G. and Lucas
Meyer under the trade names 'Lipoid 505' and 'Topcithinl, respectively.
The emulsions are prepared in dosage unit forms so that a single dosage unit can be added to a standard infant feed, e.g. a 150 ml feed. The fluorescein difatty acid ester may be present in an amount of from about
O.1 to 0.5 m.moles, preferably about 0.125 m.moles.
In the case of the emulsions containing a saccharide as the second marker compound, the saccharide is, of course, present to provide a means of measuring gastrointestinal permeability. The saccharide should be nonmetabolisable and the preferred saccharide is mannitol.
Alternatives include lactulose, xylose and rhamnose. The saccharide should be present in molar excess compared with the fluorescein ester. Typically, the saccharide is present in the emulsion in concentrations of from 1 to 10 m.moles, e.g. about 6.25 m.moles. The resulting emulsions are filled into boro-silicate vials in the desired unit doses, sealed and autoclaved to sterilise them.
The following specific formulations of emulsion formulations will illustrate the invention. In all cases, the FDL was pre-dissolved in the Miglyol 812, the remaining components were added and emulsified using an ultrasonic disperser.
ExamPle I
Single Marker Svstem
ComPonent mqfdose % w/w
Fluorescein Dilaurate 87.00 0.87
Miglyol 812 1250.00 12.50 (coconut oil triglyceride)
Lipid S05 250.00 2.50 (soya bean lecithin)
Water (mains, boiled) 8413.00 84.13
======== ======
10000.00 100.00
Example 2
Dual Marker Svstem
ComPonent m/dose % wiw Fluorescein Dilaurate 87.00 0.87
Mannitol B.P. 1138.00 11.38
Miglyol 812 1250.00 12.50
Lipoid S05 250.00 2.50
Water (mains, boiled) 7275.00 72.65
======== ======
10000.00 100.00
As stated above, the diagnostic composition may be administered as an encapsulated solid composition or a tabletted composition which may be administered in one or more tablets or capsules.Typically, a dosage unit of the
FDL is from 0.2 to 0.8 mmols and the mannitol from about 20 to 30 mmols with FDL and mannitol being typically in the moler ratio of 1:50. The FDL and Mannitol may be intimately mixed to form a homogeneous powder and filled into hard gelatin capsules. Suitable flow and compaction aids, commonly known to those familiar to capsule technology, may be added to assist production.
An example of an encapsulated formulation is as follows:
ComPonent m/dose % w/w
Fluorescein Dilaurate 87.00 7.03
Mannitol 1138.00 91.97 Aerosil 200 12.25 1.00 (colloidal silicon dioxide)
1237.25 100.00
The powder mix may be filled into two/three size 00 hard gelatin capsules.
The formulation illustrated above is intended for infants and is one-quarter of the standard adult does. A standard adult dose would therefore be 0.5m Moles (348.5 mg) of FDL and 25m Moles (4552.0 mg) of Mannitol contained in the appropriate number of capsules.
It has been found that after administration of the diagnostic composition Q steady state is reached after about 4 to 6 hours from administration, at which time a sample may be taken and analysed for fluorescein and mannitol contents. The ratio of fluorescein to mannitol in the sample gives a clear discrimination between normal pancreatic activity and pancreatic insufficiency.
Fluorescein may be conveniently analysed quantitatively in a sample using a spectrophotometer. The evaluation can be carried out directly by measuring the absorption of a sample of urine containing the excreted fluorescein and mannitol. In the case of mannitol determination, this is conveniently carried out by the method described in the paper by Lunn et al, published in
Clinica Chimica Acta, 1989, CCA04504. In this method, mannitol is treated with mannitol dehydrogenase which is extracted from a culture of a bacterium NCIB NCTC 6992, obtainable from NCIB Torry Research Station, Aberdeen
Scotland. This particular enzyme converts mannitol into fructose and NADH which can be determined by optical density measurements at 340 nm.The relationship between the original mannitol concentration and the optical density of a sample treated with the bacterium is almost exactly linear, so that the optical density can be calibrated in mmols of mannitol. Thus, samples of the excreted urine after administration of the diagnostic composition can be determined for fluorescein and mannitol concentrations by a simple spectrophotometric analysis before and after addition of the enzyme which converts the mannitol into fructose.
In order to demonstrate the operation of the diagnostic method, the following study was carried out of 6 healthy adults (four male and two female) aged 29 to 40 years which constituted group 1. Six patients diagnosed as having cystic fibrosis (five male and one female aged 7 to 21 years) were tested both before having been supplied with pancreatic enzyme supplement (group 2) and after having been supplied with such a supplement (group 3).
After an overnight fast, each of the patients ingested an encapsulated composition comprising 0.5 mmols of FDL and 25 mmols of mannitol at time zero followed by a standardised breakfast consisting of 50 gms of bread spread with 20 gms of butter and 1 cup of liquid.
Urine was collected for ten hours in 2 hourly aliquots and urinary fluorescein was measured photometrically and mannitol was measured enzymatically and photometrically as described above. There was no significant difference in mean (standard deviation) ten hour urine volume which were 1475 (278 mmls) group 1, 1008 (398 mmls) group 2 and 849 (536 mmls) for group 3. There was also no significant difference in percentage mannitol recovery 35.0 (11.1*) group 1, 40.1 (18.1%) group and 28.6 (7.05) group 3.However, there was a pronounced difference in percent fluorescein recoveries between the three groups, i.e. 18.7 (3.8%) group 1, 1.2 (0.5 8) group 2 and 0.8 (0.3*) group 3, resulting in a significant difference in ten hourly fluorescein to mannitol ratios 57.3 (18.2). 3.4 (1.4), 3.1 t respectively.
These results are shown schematically in the attached bar charts. When the results were analysed in two hour urine aliquots it was seen that there was a delay in urinary recovery of fluorescein versus mannitol which is due to the pancreatic digestive phase in both controls and cystic fibrosis groups. Differences in urinary fluorescein to mannitol ratios between controls and cystic fibrosis patients (both those with and without pancreatic supplements) achieved biological and statistical significance from 2 to 8 hours post ingestion of the diagnostic composition. These results show that the addition of mannitol to FDL permits clear distinction between subjects with normal pancreatic function and those with cystic fibrosis whether receiving pancreatic enzyme supplements or not. Thus, by using the new diagnostic test it is possible to detect pancreatic insufficiency by taking samples between 2 and 8 hours after ingestion of the composition without the need to run a further control.
Claims (10)
1. An emulsified diagnostic composition for detecting pancreatic insufficiency which comprises an oil phase dispersed in a continuous aqueous phase, the oil phase having dissolved therein a di-fatty acid ester of fluorescein.
2. A composition according to claim 1 which also contains a saccharide which is resistant to breakdown in the stomach and does not take part in any active transport system across the intestinal mucosa.
3. A composition according to claim 2 in which the fluorescein ester and the saccharide are present in a molar proportion of about 1:5 to about 1:100, preferably from about 1:10 to about 1:60.
4. A composition according to any one of the preceding claims which is in the form of a concentrate intended for addition to a liquid feed and wherein the fluorescein ester in present in the emulsion in a concentration of from about 0:1 to 0.5 m.moles.
5. A composition according to any one of the preceding claims in which the saccharide is present in a concentration of from about 1 to 10 m.moles.
6. A composition according to any one of the preceding claims in which the fluorescein ester is fluorescein dilaurate.
7. A composition according to any one of claims 2 to 6 in which the saccharide is mannitol, lactulose, xylose or rhamnose
8. A composition according to any one of the preceding claims in which the fluorescein is dissolved in a triglyceride.
9. A composition according to claim 8 in which the triglyceride is a medium chain length triglyceride.
10. Use of a composition comprising an emulsion, containing a di-fatty acid ester of fluorescein and a saccharide which is resistant to breakdown within the stomach and does not take part in any active transport system across the intestinal mucosa, in the assessment of exocrine pancreatic function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9126224A GB2251381B (en) | 1990-07-19 | 1991-12-10 | Emulsified fluorescein diester diagnostic compositions |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB909015851A GB9015851D0 (en) | 1990-07-19 | 1990-07-19 | Diagnostic composition for assessment of pancreatic insufficiency |
| GB919114042A GB9114042D0 (en) | 1991-06-27 | 1991-06-27 | Paediatric diagnostic composition |
| GB9115524A GB2246707B (en) | 1990-07-19 | 1991-07-18 | Diagnostic compositions containing fluorescein ester for assessment of pancreatic insufficiency |
| GB9126224A GB2251381B (en) | 1990-07-19 | 1991-12-10 | Emulsified fluorescein diester diagnostic compositions |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9126224D0 GB9126224D0 (en) | 1992-02-12 |
| GB2251381A true GB2251381A (en) | 1992-07-08 |
| GB2251381B GB2251381B (en) | 1995-01-25 |
Family
ID=27265185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9126224A Expired - Fee Related GB2251381B (en) | 1990-07-19 | 1991-12-10 | Emulsified fluorescein diester diagnostic compositions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2251381B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0989137A2 (en) * | 1998-09-25 | 2000-03-29 | Tokyo Gas Co., Ltd. | Diagnostic agents for pancreatic exocrine function |
| EP1316320A1 (en) * | 2000-09-07 | 2003-06-04 | Tokyo Gas Company Limited | Preparations for diagnosing extrapancreatic secretory function |
| US6905668B1 (en) | 1998-09-25 | 2005-06-14 | Tokyo Gas Company Limited | Diagnostic agents for pancreatic exocrine function |
| WO2010018460A1 (en) * | 2008-08-14 | 2010-02-18 | Commissariat A L'energie Atomique | Fluorescent emulsion |
| US9180210B2 (en) | 2008-08-14 | 2015-11-10 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Nanocrystal nano-emulsion |
| US9289517B2 (en) | 2008-08-14 | 2016-03-22 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Fluorescent emulsion of indocyanine green |
| US10092506B2 (en) | 2008-08-14 | 2018-10-09 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Encapsulation of lipophilic or amphiphilic therapeutic agents in nano-emulsion |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3806592A (en) * | 1970-12-18 | 1974-04-23 | Rohm & Haas | Method for evaluating bile sufficiency |
-
1991
- 1991-12-10 GB GB9126224A patent/GB2251381B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3806592A (en) * | 1970-12-18 | 1974-04-23 | Rohm & Haas | Method for evaluating bile sufficiency |
Non-Patent Citations (1)
| Title |
|---|
| Martindale,The Extra Pharmacopoeia 29th.Edn.page 940 "Preparations"see"Pancreolauryl Test" * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0989137A2 (en) * | 1998-09-25 | 2000-03-29 | Tokyo Gas Co., Ltd. | Diagnostic agents for pancreatic exocrine function |
| EP0989137A3 (en) * | 1998-09-25 | 2000-10-11 | Tokyo Gas Co., Ltd. | Diagnostic agents for pancreatic exocrine function |
| US6254851B1 (en) | 1998-09-25 | 2001-07-03 | Tokyo Gas Company Limited | Diagnostic agents for pancreatic exocrine function |
| US7569208B2 (en) | 1998-09-25 | 2009-08-04 | Tokyo Gas Company Limited | Diagnostic agents for pancreatic exocrine function |
| EP1386934A1 (en) | 1998-09-25 | 2004-02-04 | Tokyo Gas Company Limited | Diagnostic agents for pancreatic exocrine function |
| US6905668B1 (en) | 1998-09-25 | 2005-06-14 | Tokyo Gas Company Limited | Diagnostic agents for pancreatic exocrine function |
| EP1316320A4 (en) * | 2000-09-07 | 2005-12-07 | Tokyo Gas Co Ltd | Preparations for diagnosing extrapancreatic secretory function |
| US7125683B2 (en) | 2000-09-07 | 2006-10-24 | Tokyo Gas Company Limited | Preparations for diagnosis extrapancreatic secretory function |
| EP1316320A1 (en) * | 2000-09-07 | 2003-06-04 | Tokyo Gas Company Limited | Preparations for diagnosing extrapancreatic secretory function |
| WO2010018460A1 (en) * | 2008-08-14 | 2010-02-18 | Commissariat A L'energie Atomique | Fluorescent emulsion |
| FR2935001A1 (en) * | 2008-08-14 | 2010-02-19 | Commissariat Energie Atomique | FLUORESCENT EMULSION |
| US9180210B2 (en) | 2008-08-14 | 2015-11-10 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Nanocrystal nano-emulsion |
| US9289517B2 (en) | 2008-08-14 | 2016-03-22 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Fluorescent emulsion of indocyanine green |
| US10092506B2 (en) | 2008-08-14 | 2018-10-09 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Encapsulation of lipophilic or amphiphilic therapeutic agents in nano-emulsion |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2251381B (en) | 1995-01-25 |
| GB9126224D0 (en) | 1992-02-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20050718 |