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Determination of propionic acid in bakery products by liquid chromatography
Benkovská, Dagmar ; Vítová, Eva (referee) ; Kučera, Pavel (advisor)
This thesis deals with the development of high performance liquid chromatography method (HPLC) for the determination of propionic acid in bakery products. This work is resulting from the requirements and conditions of Czech Agriculture and Food Inspection Authority (CAFIA) laboratory in Brno. The theoretical part of the thesis describes properties, production, metabolism, toxicity and preservative effect of propionic acid. Furthermore it is treating about HPLC, validation of some analytical method and methods of propionic acid determination. Experimental part is focused on the propionic acid determination in the major part of available products with this preservative on the Czech market. Propionic acid was extracted from the sample with water, filtered and the filtrate was analyzed directly by HPLC. Separation was performed on a XBridge C18 column (3 x 150 mm, 3,5 µm) with a mobile phase of phosphate buffer (pH adjusted to 2,8) and UV detection at 210 nm. Used method of propionic acid isolation was compared with repeated extraction method, extraction in the mobile phase solution and steam destilation both in commercial samples and in laboratory baked breads with known addition of propionic acid. HPLC with water extraction technique was evaluated as a suitable method for propionic acid determination in bakery products.
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Determination of propionic acid in bakery products by liquid chromatography
Benkovská, Dagmar ; Vítová, Eva (referee) ; Kučera, Pavel (advisor)
This thesis deals with the development of high performance liquid chromatography method (HPLC) for the determination of propionic acid in bakery products. This work is resulting from the requirements and conditions of Czech Agriculture and Food Inspection Authority (CAFIA) laboratory in Brno. The theoretical part of the thesis describes properties, production, metabolism, toxicity and preservative effect of propionic acid. Furthermore it is treating about HPLC, validation of some analytical method and methods of propionic acid determination. Experimental part is focused on the propionic acid determination in the major part of available products with this preservative on the Czech market. Propionic acid was extracted from the sample with water, filtered and the filtrate was analyzed directly by HPLC. Separation was performed on a XBridge C18 column (3 x 150 mm, 3,5 µm) with a mobile phase of phosphate buffer (pH adjusted to 2,8) and UV detection at 210 nm. Used method of propionic acid isolation was compared with repeated extraction method, extraction in the mobile phase solution and steam destilation both in commercial samples and in laboratory baked breads with known addition of propionic acid. HPLC with water extraction technique was evaluated as a suitable method for propionic acid determination in bakery products.
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