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Stephanie Krüger
University of Giessen
9Publications
5H-index
79Citations
Publications 9
Newest
#1Stephanie Krüger (University of Giessen)H-Index: 5
#2A. Bergin (University of Giessen)H-Index: 1
Last.Gertrud E. Morlock (University of Giessen)H-Index: 28
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Abstract Decision makers responsible for quality management along the food chain need to reflect on their analytical tools that should ensure quality of food and especially superfood. The “4ables” in target analysis (stable, extractable, separable, detectable) focusing on marker compounds do not cover all relevant information about the sample. On the example of ginger, a streamlined quantitative bioprofiling was developed for effect-directed analysis of 17 commercially available ginger and ginge...
#1Stephanie Krüger (University of Giessen)H-Index: 5
#2Gertrud E. Morlock (University of Giessen)H-Index: 28
Abstract Colored wheat varieties and crosses were analyzed to figure out their anthocyanin profiles, and thus, their potential as health-related food. After method development, the obtained 94 anthocyanin fingerprints allowed the clear differentiation of the blue aleurone and purple pericarp genotypes as well as their breeding lines. The method was trimmed so that the complete analysis of the whole grain flour including sample preparation of up to 20 samples on one plate took less than 3 h (
#1Stephanie Krüger (University of Giessen)H-Index: 5
#2Luisa Winheim (University of Giessen)H-Index: 1
Last.Gertrud E. Morlock (University of Giessen)H-Index: 28
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Abstract A sensitive quantitative screening of coumarin in 43 commercially available cinnamons and cinnamon-containing foods was developed via HPTLC. Complex samples like cinnamon, tea, breakfast cereals, milk rice, jam, cinnamon stars and buns were extracted with methanol only. Separation was performed on silica gel with a mixture of n- hexane, ethyl acetate and ammonia. The specific detection via derivatization with an ethanolic potassium hydroxide solution resulted in fluorescent coumarin zon...
#1Stephanie Krüger (University of Giessen)H-Index: 5
#2L. Hüsken (University of Giessen)H-Index: 1
Last.Gertrud E. Morlock (University of Giessen)H-Index: 28
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Abstract Quantitative effect-directed profiles of 77 industrially and freshly extracted botanicals like herbs, spices, vegetables and fruits, widely used as food ingredients, dietary supplements or traditional medicine, gave relevant information on their quality. It allows the assessment of food, dietary supplements and phytomedicines with regard to potential health-promoting activities. In contrary to sum parameter assays and targeted analysis, chromatography combined with effect-directed analy...
#1Martin Doert (Technical University of Berlin)H-Index: 1
#2Stephanie Krüger (University of Giessen)H-Index: 5
Last.Lothar W. Kroh (Technical University of Berlin)H-Index: 34
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Ternary mixtures of lecithins, vitamin C and vitamin E are powerful antioxidants for the stabilization of polyunsaturated (n-3 fatty acid) oils. In this study, the chemistry of the antioxidant synergistic effect was investigated in ethyl linoleate (EL) containing α-tocopherol (α-Toc) or in linoleate rich vegetable oils at 110 °C using mixtures of phosphatidylethanolamine (PE) and either l-ascorbic acid (AA) or l-dehydroascorbic acid (DHA). The highest stabilization effects in EL were similar in ...
#1Stephanie Krüger (University of Giessen)H-Index: 5
#2M. Mirgos (University of Giessen)H-Index: 1
Last.Gertrud E. Morlock (University of Giessen)H-Index: 28
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Abstract A healthy diet is an important factor in a healthy lifestyle that is becoming increasingly important in today's society. The fruits of European elder ( Sambucus nigra L.) are a rich source of bioactive compounds like anthocyanins. In this study, dried and fresh fruits of four cultivated and six wild growing plants were investigated for their anthocyanin pattern and content as well as their bioactive compounds. After separation on HPTLC plates silica gel 60 F 254 with a mixture of ethyl ...
The scarce availability of nongenetically modified soybeans on the world market represents a growing problem for food manufacturers. Hence, in this study the effects of substituting soybean with sunflower lecithin were investigated with regard to chocolate production. The glycerophospholipid pattern of the different lecithin samples was investigated by high-performance thin-layer chromatography fluorescence detection (HPTLC-FLD) and by HPTLC-positive ion electrospray ionization mass spectrometry...
#1Stephanie Krüger (University of Giessen)H-Index: 5
#2Gertrud E. Morlock (University of Giessen)H-Index: 28
Abstract This chapter introduces the role of high-performance thin-layer chromatography (HPTLC) in the field of food analysis. HPTLC is well suited to food analysis as shown by many interesting examples analyzed with validated and standardized methods leading to results comparable to those obtained by other chromatographic techniques. Advances in automation and hyphenation made this inexpensive technique attractive for many issues in food analysis. For screening of food for bioactive compounds, ...
#1Stephanie Krüger (University of Hohenheim)H-Index: 5
#2Olessia Urmann (University of Giessen)H-Index: 1
Last.Gertrud E. Morlock (University of Hohenheim)H-Index: 28
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Abstract An efficient HPTLC method was developed, which required minimal sample preparation for quantitation of the main anthocyanes in pomace, animal feed as well as various foods. The best separation of 11 anthocyanes was achieved on HPTLC plates silica gel 60 F 254 with a mixture of ethyl acetate–2-butanone–formic acid–water for anthocyanins and ethyl acetate–toluene–formic acid–water for anthocyanidins. Due to the high flexibility of the HPTLC method, both anthocyane groups could be develope...
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