The present invention relates to a method for separating off a substance from a solution, in which electromagnetic radiation is radiated into the solution, an intensity of the electromagnetic radiation which has been scattered by crystals located in the solution is detected, the detected intensity is compared with a desired intensity (I.sub.S) and the temperature of the solution is regulated depending on the difference between the detected intensity and the desired intensity (I.sub.S) in such a way that the amount of this difference is reduced. If the amount of the difference between the detected intensity and the desired intensity (I.sub.S) is less than a limiting value, a crystallization method is started in which crystals of the substance are obtained which are then separated off.

The present invention relates to a method for separating off a substance from a solution, in which electromagnetic radiation is radiated into the solution, an intensity of the electromagnetic radiation which has been scattered by crystals located in the solution is detected, the detected intensity is compared with a desired intensity (I.sub.S) and the temperature of the solution is regulated depending on the difference between the detected intensity and the desired intensity (I.sub.S) in such a way that the amount of this difference is reduced. If the amount of the difference between the detected intensity and the desired intensity (I.sub.S) is less than a limiting value, a crystallization method is started in which crystals of the substance are obtained which are then separated off.

In one embodiment, a light emitting device includes a lighting element located in a housing, wherein the housing is formed from a plastic composition including, for example, a polycarbonate formed from reacting, in the presence of a transesterification catalyst, a diaryl carbonate ester and a bisphenol A, wherein the bisphenol A has a sulfur concentration of 1 ppm to 15 ppm, based upon a weight of the bisphenol A; and a conversion material wherein the conversion material includes an inorganic material that converts radiation of a certain wavelength and re-emits of a different wavelength; wherein after the conversion material has been exposed to an excitation source, the conversion material has a luminescence lifetime of less than 10.sup.−4 seconds when the excitation source is removed.

In one embodiment, a light emitting device includes a lighting element located in a housing, wherein the housing is formed from a plastic composition including, for example, a polycarbonate formed from reacting, in the presence of a transesterification catalyst, a diaryl carbonate ester and a bisphenol A, wherein the bisphenol A has a sulfur concentration of 1 ppm to 15 ppm, based upon a weight of the bisphenol A; and a conversion material wherein the conversion material includes an inorganic material that converts radiation of a certain wavelength and re-emits of a different wavelength; wherein after the conversion material has been exposed to an excitation source, the conversion material has a luminescence lifetime of less than 10.sup.−4 seconds when the excitation source is removed.

In one embodiment, a light emitting device includes a lighting element located in a housing, wherein the housing is formed from a plastic composition including, for example, a polycarbonate formed from reacting, in the presence of a transesterification catalyst, a diaryl carbonate ester and a bisphenol A, wherein the bisphenol A has a sulfur concentration of 1 ppm to 15 ppm, based upon a weight of the bisphenol A; and a conversion material wherein the conversion material includes an inorganic material that converts radiation of a certain wavelength and re-emits of a different wavelength; wherein after the conversion material has been exposed to an excitation source, the conversion material has a luminescence lifetime of less than 10.sup.−4 seconds when the excitation source is removed.

It is to provide a more stable crystal polymorph of a clathrate compound consisting of 1,1,2,2-tetrakis(4-hydroxyphenyl)ethane and 2-phenyl-4-methyl-5-hydroxymethylimidazole (molar ratio 1:2). A novel crystal polymorph of a clathrate compound, consisting of 1,1,2,2-tetrakis(4-hydroxyphenyl)ethane and 2-phenyl-4-methyl-5-hydroxymethylimidazole (molar ratio 1:2) and has diffraction peaks at diffraction angles (2θ) of 11.20°, 13.36°, 14.36°, 18.16°, 19.20°, 19.68°, 20.84°, 21.48°, 22.56°, 23.76° and 24.08° in a powder X-ray diffraction pattern as measured using a CuKα ray, can be obtained by, for example, further recrystallizing a crystal obtained by a conventionally known method or the like.

It is to provide a more stable crystal polymorph of a clathrate compound consisting of 1,1,2,2-tetrakis(4-hydroxyphenyl)ethane and 2-phenyl-4-methyl-5-hydroxymethylimidazole (molar ratio 1:2). A novel crystal polymorph of a clathrate compound, consisting of 1,1,2,2-tetrakis(4-hydroxyphenyl)ethane and 2-phenyl-4-methyl-5-hydroxymethylimidazole (molar ratio 1:2) and has diffraction peaks at diffraction angles (2θ) of 11.20°, 13.36°, 14.36°, 18.16°, 19.20°, 19.68°, 20.84°, 21.48°, 22.56°, 23.76° and 24.08° in a powder X-ray diffraction pattern as measured using a CuKα ray, can be obtained by, for example, further recrystallizing a crystal obtained by a conventionally known method or the like.

The present specification discloses methods of purifying one or more cannabinoids from a plant material, purified cannabinoids and pharmaceutical compositions comprising one or more cannabinoids produced by the disclosed method, methods and uses for treating a disease or condition employing such purified cannabinoids and pharmaceutical compositions.

The present specification discloses methods of purifying one or more cannabinoids from a plant material, purified cannabinoids and pharmaceutical compositions comprising one or more cannabinoids produced by the disclosed method, methods and uses for treating a disease or condition employing such purified cannabinoids and pharmaceutical compositions.

The present invention relates to solid compositions comprising cocrystals of cannabinoids, processes for their preparation, and their use as in therapy or in cosmetics or for the purification of cannabinoids. It also relates to cocrystals of cannabinoids.