Method for qualitative detection of added blood plasma in foodstuffs in meat and meat products, wherein during sample preparation, the foodstuffs are separated into precipitate phases and fluid phases, wherein at least some of the fluid phase is investigated qualitatively and quantitatively for amino acids, wherein the ascertained sample contents of these fluid phase amino acids are compared with such sample contents which come from the corresponding foodstuffs not treated with blood plasma, wherein in the investigation for added blood plasma in the fluid phase, the amino acids ornithine and cysteine are taken into account, - characterised in that the method is a chromatographic method using several eluents and a separating programme, wherein the eluents are the following with respectively the following relevant composition: - A: Lithium acetate dihydrate 6.65 g, ethanol 10 ml, trifluoroacetic acid solution 50% 8 ml. caprylic acid 0.1 ml, ultrapure water 470 ml. - B: Lithium hydroxide monohydrate 2.5 g, boric acid 0.5 g, ethanol 5 ml, caprylic acid 0.1 ml, trifluoroacetic acid solution 50% 4.7 ml, ultrapure water 480 ml. - C: Lithium hydroxide monohydrate 2.1 g, boric acid 1.5 g, formic acid 1.5 ml, acetic acid 100% 1.5 ml, caprylic acid 0.1 ml, trifluoroacetic acid solution 50% 0.8 ml, ultrapure water 495 ml. - D: Di-lithium tetraborate 2.0 g, boric acid 2.5 g, ethylenediaminetetraacetic acid di-lithium salt hydrate 0.13 g, lithium hydroxide monohydrate 3.18 g, caprylic acid 0.1 ml, trifluoroacetic acid 50% 3 ml, ultrapure water 483 ml. - E: Di-lithium tetraborate 1.0 g, boric acid 1.5 g, lithium hydroxide monohydrate 5.25 g, caprylic acid 0.1 ml, trifluoroacetic acid 50% 3.5 ml, ultrapure water 490 ml. - characterised in that the method is a chromatographic method using several eluents and a separating programme, wherein the eluents are the following with respectively the following relevant composition: - A: Lithium acetate dihydrate 6.65 g, ethanol 10 ml, trifluoroacetic acid solution 50% 8 ml. caprylic acid 0.1 ml, ultrapure water 470 ml. - B: Lithium hydroxide monohydrate 2.5 g, boric acid 0.5 g, ethanol 5 ml, caprylic acid 0.1 ml, trifluoroacetic acid solution 50% 4.7 ml, ultrapure water 480 ml. - C: Lithium hydroxide monohydrate 2.1 g, boric acid 1.5 g, formic acid 1.5 ml, acetic acid 100% 1.5 ml, caprylic acid 0.1 ml, trifluoroacetic acid solution 50% 0.8 ml, ultrapure water 495 ml. - D: Di-lithium tetraborate 2.0 g, boric acid 2.5 g, ethylenediaminetetraacetic acid di-lithium salt hydrate 0.13 g, lithium hydroxide monohydrate 3.18 g, caprylic acid 0.1 ml, trifluoroacetic acid 50% 3 ml, ultrapure water 483 ml. - E: Di-lithium tetraborate 1.0 g, boric acid 1.5 g, lithium hydroxide monohydrate 5.25 g, caprylic acid 0.1 ml, trifluoroacetic acid 50% 3.5 ml, ultrapure water 490 ml. - A: Lithium acetate dihydrate 6.65 g, ethanol 10 ml, trifluoroacetic acid solution 50% 8 ml. caprylic acid 0.1 ml, ultrapure water 470 ml. - B: Lithium hydroxide monohydrate 2.5 g, boric acid 0.5 g, ethanol 5 ml, caprylic acid 0.1 ml, trifluoroacetic acid solution 50% 4.7 ml, ultrapure water 480 ml. - C: Lithium hydroxide monohydrate 2.1 g, boric acid 1.5 g, formic acid 1.5 ml, acetic acid 100% 1.5 ml, caprylic acid 0.1 ml, trifluoroacetic acid solution 50% 0.8 ml, ultrapure water 495 ml. - D: Di-lithium tetraborate 2.0 g, boric acid 2.5 g, ethylenediaminetetraacetic acid di-lithium salt hydrate 0.13 g, lithium hydroxide monohydrate 3.18 g, caprylic acid 0.1 ml, trifluoroacetic acid 50% 3 ml, ultrapure water 483 ml. - E: Di-lithium tetraborate 1.0 g, boric acid 1.5 g, lithium hydroxide monohydrate 5.25 g, caprylic acid 0.1 ml, trifluoroacetic acid 50% 3.5 ml, ultrapure water 490 ml.