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Lycopene Preparation
» Lycopene Preparation is a combination of Lycopene with one or more inert substances and suitable antioxidants. It may be in a solid or oily liquid form. It contains not less than 95.0 percent and not more than 120.0 percent of the labeled amount of lycopene (C40H56), calculated on the anhydrous basis.
Packaging and storage— Preserve in tight, light-resistant containers under inert gas. Store the oil preparations in a cool place and the solid preparations at controlled room temperature.
Labeling— Label it to state the name and content of added antioxidants and inert substances. Label it to indicate whether the article is prepared with lycopene from natural sources or with synthetic lycopene. If prepared with lycopene from natural sources, label it to indicate the natural source, including its Latin binomial.
Identification, Ultraviolet-Visible Absorption 197U
FOR OILY PREPARATIONS—
Spectral range: 300 to 700 nm.
Solution— Prepare as directed below for the Test solution in Content of lycopene (test for oily preparations).
Ratio: A476 / A508 between 1.10 and 1.14 in cyclohexane.
FOR SOLID PREPARATIONS—
Spectral range: 300 to 700 nm.
Solution— Prepare as directed below for the Test solution in Content of lycopene (test for solid preparations).
Ratio: A472 / A504 between 1.09 and 1.13 in isopropyl alcohol.
Water, Method I 921: not more than 8.0%.
Organic volatile impurities, Method IV 467: meets the requirements.
Solvent— Use dimethylformamide.
Content of all-E-lycopene, 5Z-lycopene, and related compounds—
Mobile phase, Standard solution, and Chromatographic system— Proceed as directed for Content of all-E-lycopene, 5Z-lycopene, and related compounds under Lycopene.
Test solution for oil preparations —Transfer a quantity of oil Preparation, equivalent to about 15 mg of lycopene, to a 25-mL volumetric flask, and dissolve in tetrahydrofuran containing 50 mg of butylated hydroxytoluene per L. Dilute with the same solvent to volume. Pipet 2 mL into a 50-mL volumetric flask, and add 8 mL of tetrahydrofuran. Dilute with tert-butyl methyl ether to volume. Use this solution for injection.
Test solution for solid preparations —Transfer a quantity of solid Preparation, equivalent to 5 mg of lycopene, into a 250-mL volumetric flask, and add about 60 units of bacterial alkaline protease preparation or another suitable enzyme and about 25 mg of butylated hydroxytoluene. Add 2.5 mL of water, place in an ultrasonic bath at 50 for 10 minutes, and shake occasionally until the material is finely divided with no lumps. Add 5 mL of tetrahydrofuran and 40 mL of dehydrated alcohol, and place again for about 1 minute in the ultrasonic bath. Cool to room temperature, and dilute with tert-butyl methyl ether to volume. Shake vigorously. Allow the precipitate to settle, and filter the supernatant.
Procedure— Proceed as directed for Content of all-E-lycopene, 5Z-lycopene, and related compounds under Lycopene. Calculate the percentage of related compounds in the portion of Lycopene Preparation taken by the formula:
rs / rT ,
in which rs is the sum of the responses of all peaks except the peak for all-E-lycopene and the peak for 5Z-lycopene, and rT is the total detected area in the chromatogram: not more than 14.0% of other related compounds calculated as lycopene is found. Calculate the percentage of the 5Z-lycopene isomer in the portion of Lycopene Preparation taken by the formula:
r5Z / rT ,
in which r5Z is the peak response for the 5Z-lycopene isomer, and the other terms are as described above: not more than 23.0%  of the 5Z-lycopene isomer is found. Calculate the percentage of all-E-lycopene in the portion of Lycopene Preparation taken by the formula:
rE / rT ,
in which rE is the peak response of the all-E-lycopene isomer, and the other terms are as described above: not less than 65.0% of all-E-lycopene is found.
Content of lycopene—
TEST FOR OILY PREPARATIONS—
Test stock solution— Transfer an accurately weighed quantity of Lycopene Preparation containing about 25 mg of lycopene to a 100-mL volumetric flask, and add about 25 mg of butylated hydroxytoluene and about 60 mL of methylene chloride. Sonicate to dissolve, and dilute with methylene chloride to volume.
Test solution —Transfer 2.0 mL of the Test stock solution to a 200-mL volumetric flask, and dilute with cyclohexane to volume.
Procedure— Determine the absorbance of the Test solution at the wavelength of maximum absorbance at about 476 nm, using cyclohexane as the blank. Calculate the percentage of lycopene in the portion of Lycopene Preparation taken by the formula:
1000A/331W,
in which A is the absorbance of the Test solution; W is the weight, in g, of the portion of Lycopene Preparation taken to prepare the Test stock solution; and 331 is the absorptivity of the pure lycopene in cyclohexane.
TEST FOR SOLID PREPARATIONS—
Test stock solution— Transfer an accurately weighed quantity of Lycopene Preparation containing about 5 mg of lycopene into a 200-mL volumetric flask. Add about 60 units of bacterial alkaline protease preparation or another suitable enzyme and about 25 mg of butylated hydroxytoluene. Add 2.5 mL of diluted ammonium hydroxide (2 in 100). Incubate in a water bath (about 40) until the matrix has dissolved (about 1 to 2 minutes), while rotating the flask to avoid having material stick to the glass surface. Add 5 mL of tetrahydrofuran, and shake until no colored precipitate remains. Add another portion of 2 mL of tetrahydrofuran. Add 40 mL of dehydrated alcohol, and shake until the mixture is homogeneous. Add 100 mL of diethyl ether, and shake vigorously. Dilute with diethyl ether to volume, shake vigorously, and allow to stand until the solid has settled.
Test solution— Transfer 2.0 mL of the supernatant from the Test stock solution to a 25-mL volumetric flask, and dilute with isopropyl alcohol to volume.
Procedure— Determine the absorbance of the Test solution at the wavelength of maximum absorbance at about 472 nm, using isopropyl alcohol as the blank. Calculate the percentage of lycopene in the portion of Lycopene Preparation taken by the formula:
250A/320W,
in which A is the absorbance of the Test solution; W is the weight, in g, of the portion of Lycopene Preparation taken to prepare the Test stock solution; and 320 is the absorptivity of the pure lycopene in isopropyl alcohol.
Residual solvents 467: meets the requirements.
(Official January 1, 2007)
Auxiliary Information— Staff Liaison : Maged H. Sharaf, Ph.D., Senior Scientist
Expert Committee : (DSB05) Dietary Supplements - Botanicals
USP29–NF24 Page 2356
Pharmacopeial Forum : Volume No. 30(6) Page 2075
Phone Number : 1-301-816-8318