[{"user_id":"83781","year":"2026","status":"public","keyword":["Biodiesel aging","Epoxide-dependent oligomerization","Acetic acid","Identification of aging products","Kinetics of aging products"],"abstract":[{"text":"The aging of biodiesel proceeds via multiple pathways, with oligomerization playing a central role. In this study, we investigated an epoxide-dependent oligomerization pathway, which had previously only been postulated. Using methyl oleate (C18:1) as a model monounsaturated fatty acid and acetic acid as a representative, reactive nucleophile and known biodiesel aging product with a suitable boiling point, oligomeric products were identified by size-exclusion chromatography (SEC) coupled with electrospray ionization quadrupole time-of-flight mass spectrometry (ESI-QTOF-MS). The concentration of 20 wt% was chosen to ensure a measurable kinetic effect while maintaining stable reaction conditions. Furthermore, the role of methyl oleate during biodiesel aging was addressed. Time-resolved analysis confirmed the proposed sequential order of reactions. It was pointed out that elimination reactions may occur. The data support the formation of epoxides, despite the isobaric overlap with ketones, and show that hydroxyl intermediates undergo esterification and etherification. Moreover, experiments with pure C18:1 demonstrated that acetic acid–derived oligomers are generated. Under Rancimat conditions, addition of 20 wt% acetic acid resulted in an approximately 1.1 – 2.6 increase in product yield. Kinetic analysis revealed structure-dependent formation and decay behavior of the aging products, with slightly faster epoxidation and shifted product distributions toward higher oligomeric species in the presence of acetic acid. Reactive intermediates were consumed more rapidly than oligomeric species and all decay processes followed apparent second-order kinetics. These findings provide direct experimental evidence for the involvement of epoxide-dependent pathways in biodiesel aging.","lang":"eng"}],"type":"scientific_journal_article","publisher":"Elsevier","doi":"10.1016/j.fuel.2026.139339","date_updated":"2026-04-08T12:55:00Z","quality_controlled":"1","publication":"Fuel : the science and technology of fuel and energy ","_id":"13671","article_number":"139339","intvolume":"       424","author":[{"last_name":"Türck","full_name":"Türck, Julian","first_name":"Julian"},{"full_name":"Funke, Carsten","id":"74167","last_name":"Funke","first_name":"Carsten"},{"full_name":"Schmitt, Fabian","last_name":"Schmitt","first_name":"Fabian"},{"orcid":"0000-0001-6401-8873","full_name":"Schneider, Jan","id":"13209","last_name":"Schneider","first_name":"Jan"},{"first_name":"Hans-Jürgen","last_name":"Danneel","id":"12231","full_name":"Danneel, Hans-Jürgen"},{"first_name":"Ralf","full_name":"Türck, Ralf","last_name":"Türck"},{"full_name":"Ruck, Wolfgang","last_name":"Ruck","first_name":"Wolfgang"},{"first_name":"Jürgen","full_name":"Krahl, Jürgen","last_name":"Krahl","id":"68870"}],"publication_identifier":{"issn":["0016-2361"],"eissn":["1873-7153"]},"citation":{"short":"J. Türck, C. Funke, F. Schmitt, J. Schneider, H.-J. Danneel, R. Türck, W. Ruck, J. Krahl, Fuel : The Science and Technology of Fuel and Energy  424 (2026).","mla":"Türck, Julian, et al. “Kinetic Study and Confirmation of Epoxide-Dependent Oligomerization of Methyl Oleate.” <i>Fuel : The Science and Technology of Fuel and Energy </i>, vol. 424, 139339, 2026, <a href=\"https://doi.org/10.1016/j.fuel.2026.139339\">https://doi.org/10.1016/j.fuel.2026.139339</a>.","apa":"Türck, J., Funke, C., Schmitt, F., Schneider, J., Danneel, H.-J., Türck, R., Ruck, W., &#38; Krahl, J. (2026). Kinetic study and confirmation of epoxide-dependent oligomerization of methyl oleate. <i>Fuel : The Science and Technology of Fuel and Energy </i>, <i>424</i>, Article 139339. <a href=\"https://doi.org/10.1016/j.fuel.2026.139339\">https://doi.org/10.1016/j.fuel.2026.139339</a>","ufg":"<b>Türck, Julian u. a.</b>: Kinetic study and confirmation of epoxide-dependent oligomerization of methyl oleate, in: <i>Fuel : the science and technology of fuel and energy </i> 424 (2026).","chicago-de":"Türck, Julian, Carsten Funke, Fabian Schmitt, Jan Schneider, Hans-Jürgen Danneel, Ralf Türck, Wolfgang Ruck und Jürgen Krahl. 2026. Kinetic study and confirmation of epoxide-dependent oligomerization of methyl oleate. <i>Fuel : the science and technology of fuel and energy </i> 424. doi:<a href=\"https://doi.org/10.1016/j.fuel.2026.139339\">10.1016/j.fuel.2026.139339</a>, .","havard":"J. Türck, C. Funke, F. Schmitt, J. Schneider, H.-J. Danneel, R. Türck, W. Ruck, J. Krahl, Kinetic study and confirmation of epoxide-dependent oligomerization of methyl oleate, Fuel : The Science and Technology of Fuel and Energy . 424 (2026).","bjps":"<b>Türck J <i>et al.</i></b> (2026) Kinetic Study and Confirmation of Epoxide-Dependent Oligomerization of Methyl Oleate. <i>Fuel : the science and technology of fuel and energy </i> <b>424</b>.","din1505-2-1":"<span style=\"font-variant:small-caps;\">Türck, Julian</span> ; <span style=\"font-variant:small-caps;\">Funke, Carsten</span> ; <span style=\"font-variant:small-caps;\">Schmitt, Fabian</span> ; <span style=\"font-variant:small-caps;\">Schneider, Jan</span> ; <span style=\"font-variant:small-caps;\">Danneel, Hans-Jürgen</span> ; <span style=\"font-variant:small-caps;\">Türck, Ralf</span> ; <span style=\"font-variant:small-caps;\">Ruck, Wolfgang</span> ; <span style=\"font-variant:small-caps;\">Krahl, Jürgen</span>: Kinetic study and confirmation of epoxide-dependent oligomerization of methyl oleate. In: <i>Fuel : the science and technology of fuel and energy </i> Bd. 424. Amsterdam [u.a.], Elsevier (2026)","chicago":"Türck, Julian, Carsten Funke, Fabian Schmitt, Jan Schneider, Hans-Jürgen Danneel, Ralf Türck, Wolfgang Ruck, and Jürgen Krahl. “Kinetic Study and Confirmation of Epoxide-Dependent Oligomerization of Methyl Oleate.” <i>Fuel : The Science and Technology of Fuel and Energy </i> 424 (2026). <a href=\"https://doi.org/10.1016/j.fuel.2026.139339\">https://doi.org/10.1016/j.fuel.2026.139339</a>.","ieee":"J. Türck <i>et al.</i>, “Kinetic study and confirmation of epoxide-dependent oligomerization of methyl oleate,” <i>Fuel : the science and technology of fuel and energy </i>, vol. 424, Art. no. 139339, 2026, doi: <a href=\"https://doi.org/10.1016/j.fuel.2026.139339\">10.1016/j.fuel.2026.139339</a>.","van":"Türck J, Funke C, Schmitt F, Schneider J, Danneel HJ, Türck R, et al. Kinetic study and confirmation of epoxide-dependent oligomerization of methyl oleate. Fuel : the science and technology of fuel and energy . 2026;424.","ama":"Türck J, Funke C, Schmitt F, et al. Kinetic study and confirmation of epoxide-dependent oligomerization of methyl oleate. <i>Fuel : the science and technology of fuel and energy </i>. 2026;424. doi:<a href=\"https://doi.org/10.1016/j.fuel.2026.139339\">10.1016/j.fuel.2026.139339</a>"},"place":"Amsterdam [u.a.]","publication_status":"published","volume":424,"language":[{"iso":"eng"}],"date_created":"2026-04-07T12:49:23Z","title":"Kinetic study and confirmation of epoxide-dependent oligomerization of methyl oleate"},{"citation":{"bjps":"<b>Lichtinger A <i>et al.</i></b> (2024) Thermo-Oxidative Aging of Linear and Branched Alcohols as Stability Criterion for Their Use as e-Fuels. <i>  Sustainable energy &#38; fuels : interdisciplinary research for the development of sustainable energy technologies </i> <b>8</b>, 3329–3340.","din1505-2-1":"<span style=\"font-variant:small-caps;\">Lichtinger, Anne</span> ; <span style=\"font-variant:small-caps;\">Poller, Maximilian J.</span> ; <span style=\"font-variant:small-caps;\">Schröder, Olaf</span> ; <span style=\"font-variant:small-caps;\">Türck, Julian</span> ; <span style=\"font-variant:small-caps;\">Garbe, Thomas</span> ; <span style=\"font-variant:small-caps;\">Krahl, Jürgen</span> ; <span style=\"font-variant:small-caps;\">Jakob, Markus</span> ; <span style=\"font-variant:small-caps;\">Albert, Jakob</span>: Thermo-oxidative aging of linear and branched alcohols as stability criterion for their use as e-fuels. In: <i>  Sustainable energy &#38; fuels : interdisciplinary research for the development of sustainable energy technologies </i> Bd. 8. Cambridge , Royal Society of Chemistry (RSC) (2024), Nr. 15, S. 3329–3340","chicago":"Lichtinger, Anne, Maximilian J. Poller, Olaf Schröder, Julian Türck, Thomas Garbe, Jürgen Krahl, Markus Jakob, and Jakob Albert. “Thermo-Oxidative Aging of Linear and Branched Alcohols as Stability Criterion for Their Use as e-Fuels.” <i>  Sustainable Energy &#38; Fuels : Interdisciplinary Research for the Development of Sustainable Energy Technologies </i> 8, no. 15 (2024): 3329–40. <a href=\"https://doi.org/10.1039/d4se00400k\">https://doi.org/10.1039/d4se00400k</a>.","ieee":"A. Lichtinger <i>et al.</i>, “Thermo-oxidative aging of linear and branched alcohols as stability criterion for their use as e-fuels,” <i>  Sustainable energy &#38; fuels : interdisciplinary research for the development of sustainable energy technologies </i>, vol. 8, no. 15, pp. 3329–3340, 2024, doi: <a href=\"https://doi.org/10.1039/d4se00400k\">10.1039/d4se00400k</a>.","van":"Lichtinger A, Poller MJ, Schröder O, Türck J, Garbe T, Krahl J, et al. Thermo-oxidative aging of linear and branched alcohols as stability criterion for their use as e-fuels.   Sustainable energy &#38; fuels : interdisciplinary research for the development of sustainable energy technologies . 2024;8(15):3329–40.","ama":"Lichtinger A, Poller MJ, Schröder O, et al. Thermo-oxidative aging of linear and branched alcohols as stability criterion for their use as e-fuels. <i>  Sustainable energy &#38; fuels : interdisciplinary research for the development of sustainable energy technologies </i>. 2024;8(15):3329-3340. doi:<a href=\"https://doi.org/10.1039/d4se00400k\">10.1039/d4se00400k</a>","short":"A. Lichtinger, M.J. Poller, O. Schröder, J. Türck, T. Garbe, J. Krahl, M. Jakob, J. Albert,   Sustainable Energy &#38; Fuels : Interdisciplinary Research for the Development of Sustainable Energy Technologies  8 (2024) 3329–3340.","apa":"Lichtinger, A., Poller, M. J., Schröder, O., Türck, J., Garbe, T., Krahl, J., Jakob, M., &#38; Albert, J. (2024). Thermo-oxidative aging of linear and branched alcohols as stability criterion for their use as e-fuels. <i>  Sustainable Energy &#38; Fuels : Interdisciplinary Research for the Development of Sustainable Energy Technologies </i>, <i>8</i>(15), 3329–3340. <a href=\"https://doi.org/10.1039/d4se00400k\">https://doi.org/10.1039/d4se00400k</a>","mla":"Lichtinger, Anne, et al. “Thermo-Oxidative Aging of Linear and Branched Alcohols as Stability Criterion for Their Use as e-Fuels.” <i>  Sustainable Energy &#38; Fuels : Interdisciplinary Research for the Development of Sustainable Energy Technologies </i>, vol. 8, no. 15, 2024, pp. 3329–40, <a href=\"https://doi.org/10.1039/d4se00400k\">https://doi.org/10.1039/d4se00400k</a>.","ufg":"<b>Lichtinger, Anne u. a.</b>: Thermo-oxidative aging of linear and branched alcohols as stability criterion for their use as e-fuels, in: <i>  Sustainable energy &#38; fuels : interdisciplinary research for the development of sustainable energy technologies </i> 8 (2024), H. 15,  S. 3329–3340.","chicago-de":"Lichtinger, Anne, Maximilian J. Poller, Olaf Schröder, Julian Türck, Thomas Garbe, Jürgen Krahl, Markus Jakob und Jakob Albert. 2024. Thermo-oxidative aging of linear and branched alcohols as stability criterion for their use as e-fuels. <i>  Sustainable energy &#38; fuels : interdisciplinary research for the development of sustainable energy technologies </i> 8, Nr. 15: 3329–3340. doi:<a href=\"https://doi.org/10.1039/d4se00400k\">10.1039/d4se00400k</a>, .","havard":"A. Lichtinger, M.J. Poller, O. Schröder, J. Türck, T. Garbe, J. Krahl, M. Jakob, J. Albert, Thermo-oxidative aging of linear and branched alcohols as stability criterion for their use as e-fuels,   Sustainable Energy &#38; Fuels : Interdisciplinary Research for the Development of Sustainable Energy Technologies . 8 (2024) 3329–3340."},"place":"Cambridge ","publication_status":"published","volume":8,"language":[{"iso":"eng"}],"date_created":"2025-04-23T12:27:18Z","author":[{"first_name":"Anne","full_name":"Lichtinger, Anne","last_name":"Lichtinger"},{"first_name":"Maximilian J.","full_name":"Poller, Maximilian J.","last_name":"Poller"},{"first_name":"Olaf","last_name":"Schröder","full_name":"Schröder, Olaf"},{"first_name":"Julian","full_name":"Türck, Julian","last_name":"Türck"},{"first_name":"Thomas","full_name":"Garbe, Thomas","last_name":"Garbe"},{"first_name":"Jürgen","last_name":"Krahl","id":"68870","full_name":"Krahl, Jürgen"},{"first_name":"Markus","last_name":"Jakob","full_name":"Jakob, Markus"},{"last_name":"Albert","full_name":"Albert, Jakob","first_name":"Jakob"}],"intvolume":"         8","isi":"1","publication_identifier":{"issn":["2398-4902"]},"title":"Thermo-oxidative aging of linear and branched alcohols as stability criterion for their use as e-fuels","publication":"  Sustainable energy & fuels : interdisciplinary research for the development of sustainable energy technologies ","_id":"12846","publisher":"Royal Society of Chemistry (RSC)","type":"scientific_journal_article","doi":"10.1039/d4se00400k","date_updated":"2025-06-25T13:00:39Z","external_id":{"isi":["001253422700001"]},"issue":"15","status":"public","user_id":"83781","year":"2024","department":[{"_id":"DEP1408"}],"abstract":[{"text":"The decarbonization of the energy supply is one of the biggest and most important challenges of the 21st century. This paper contributes to the solution of the energy crisis by investigating the stability of alcohols as e-fuels. The focus is on the investigation of the aging mechanism of the linear alcohols 1-hexanol and 1-octanol compared to the iso-alcohol 2-hexanol. It is analysed in detail how the time-dependent aging varies depending on the chain length and the position of the hydroxy-group, both in the liquid and in the gas phase. It is shown that a variety of aging products such as aldehydes, acids, short-chain alcohols and esters are formed during the aging of the n-alcohols by oxidation, decarboxylation, oxidative C-C bond cleavage and esterification. In contrast, the decomposition of the iso-alcohol is significantly lower. The results show that the total acid number is significantly higher for aged n-alcohols than for the aged iso-alcohos, while the kinematic viscosity decreases for all alcohols during aging. Carbon mass balancing shows that after accelerated aging for 120 hours, around 80% of the iso-alcohol is still present, compared to only around 57-63% for the n-alcohols. In addition, significantly fewer acids are formed with the iso-alcohol. In this study, iso-alcohols have a higher stability against thermo-oxidative aging compared to n-alcohols, showing their potential as e-fuels. Furthermore, the chain length of the alcohols has also an influence on aging, as more different aging products can be formed with increasing chain length.\r\n\r\nThis paper contributes to the solution of the energy crisis by investigating the stability of alcohols as e-fuels. The focus is on the investigation of the aging mechanism of 1-hexanol and 1-octanol compared to the 2-hexanol.","lang":"eng"}],"page":"3329-3340","keyword":["OXIDATION","1-OCTANOL","PERFORMANCE","CATALYSTS","KINETICS","ACID"]},{"publication":"Chemie Ingenieur Technik","_id":"11385","citation":{"chicago":"Kosse, Pascal, Tanja Hernández Rodriguez, Björn Frahm, Manfred Lübken, and Marc Wichern. “Validation and Uncertainty Assessment of a Software‐Integrated Workflow for PH Calculations.” <i>Chemie Ingenieur Technik</i> 95, no. 12 (2023): 1960–69. <a href=\"https://doi.org/10.1002/cite.202300082\">https://doi.org/10.1002/cite.202300082</a>.","bjps":"<b>Kosse P <i>et al.</i></b> (2023) Validation and Uncertainty Assessment of a Software‐Integrated Workflow for PH Calculations. <i>Chemie Ingenieur Technik</i> <b>95</b>, 1960–1969.","din1505-2-1":"<span style=\"font-variant:small-caps;\">Kosse, Pascal</span> ; <span style=\"font-variant:small-caps;\">Hernández Rodriguez, Tanja</span> ; <span style=\"font-variant:small-caps;\">Frahm, Björn</span> ; <span style=\"font-variant:small-caps;\">Lübken, Manfred</span> ; <span style=\"font-variant:small-caps;\">Wichern, Marc</span>: Validation and Uncertainty Assessment of a Software‐Integrated Workflow for pH Calculations. In: <i>Chemie Ingenieur Technik</i> Bd. 95. Weinheim, Wiley (2023), Nr. 12, S. 1960–1969","ama":"Kosse P, Hernández Rodriguez T, Frahm B, Lübken M, Wichern M. Validation and Uncertainty Assessment of a Software‐Integrated Workflow for pH Calculations. <i>Chemie Ingenieur Technik</i>. 2023;95(12):1960-1969. doi:<a href=\"https://doi.org/10.1002/cite.202300082\">10.1002/cite.202300082</a>","van":"Kosse P, Hernández Rodriguez T, Frahm B, Lübken M, Wichern M. Validation and Uncertainty Assessment of a Software‐Integrated Workflow for pH Calculations. Chemie Ingenieur Technik. 2023;95(12):1960–9.","ieee":"P. Kosse, T. Hernández Rodriguez, B. Frahm, M. Lübken, and M. Wichern, “Validation and Uncertainty Assessment of a Software‐Integrated Workflow for pH Calculations,” <i>Chemie Ingenieur Technik</i>, vol. 95, no. 12, pp. 1960–1969, 2023, doi: <a href=\"https://doi.org/10.1002/cite.202300082\">10.1002/cite.202300082</a>.","ufg":"<b>Kosse, Pascal u. a.</b>: Validation and Uncertainty Assessment of a Software‐Integrated Workflow for pH Calculations, in: <i>Chemie Ingenieur Technik</i> 95 (2023), H. 12,  S. 1960–1969.","chicago-de":"Kosse, Pascal, Tanja Hernández Rodriguez, Björn Frahm, Manfred Lübken und Marc Wichern. 2023. Validation and Uncertainty Assessment of a Software‐Integrated Workflow for pH Calculations. <i>Chemie Ingenieur Technik</i> 95, Nr. 12: 1960–1969. doi:<a href=\"https://doi.org/10.1002/cite.202300082\">10.1002/cite.202300082</a>, .","short":"P. Kosse, T. Hernández Rodriguez, B. Frahm, M. Lübken, M. Wichern, Chemie Ingenieur Technik 95 (2023) 1960–1969.","apa":"Kosse, P., Hernández Rodriguez, T., Frahm, B., Lübken, M., &#38; Wichern, M. (2023). Validation and Uncertainty Assessment of a Software‐Integrated Workflow for pH Calculations. <i>Chemie Ingenieur Technik</i>, <i>95</i>(12), 1960–1969. <a href=\"https://doi.org/10.1002/cite.202300082\">https://doi.org/10.1002/cite.202300082</a>","mla":"Kosse, Pascal, et al. “Validation and Uncertainty Assessment of a Software‐Integrated Workflow for PH Calculations.” <i>Chemie Ingenieur Technik</i>, vol. 95, no. 12, 2023, pp. 1960–69, <a href=\"https://doi.org/10.1002/cite.202300082\">https://doi.org/10.1002/cite.202300082</a>.","havard":"P. Kosse, T. Hernández Rodriguez, B. Frahm, M. Lübken, M. Wichern, Validation and Uncertainty Assessment of a Software‐Integrated Workflow for pH Calculations, Chemie Ingenieur Technik. 95 (2023) 1960–1969."},"place":"Weinheim","volume":95,"publication_status":"published","date_created":"2024-04-26T06:52:48Z","language":[{"iso":"eng"}],"intvolume":"        95","author":[{"last_name":"Kosse","full_name":"Kosse, Pascal","first_name":"Pascal"},{"first_name":"Tanja","id":"52466","last_name":"Hernández Rodriguez","full_name":"Hernández Rodriguez, Tanja"},{"id":"45666","last_name":"Frahm","full_name":"Frahm, Björn","first_name":"Björn"},{"first_name":"Manfred","full_name":"Lübken, Manfred","last_name":"Lübken"},{"full_name":"Wichern, Marc","last_name":"Wichern","first_name":"Marc"}],"isi":"1","publication_identifier":{"eissn":["1522-2640"],"issn":["0009-286X"]},"title":"Validation and Uncertainty Assessment of a Software‐Integrated Workflow for pH Calculations","status":"public","year":"2023","user_id":"83781","department":[{"_id":"DEP4000"}],"abstract":[{"lang":"eng","text":"Accurate pH calculations are essential for scientists across different disciplines to design optimal reactor solutions, but they can be arduous to calculate for complex acid-base solutions. Visual Water is a powerful software tool that provides accurate pH calculations with automated mathematical uncertainty analysis. Its workflow is presented and validated using acids and bases, showing a deviation of < 0.2 pH units between measured and calculated pH values. This highlights the software's reliability, which can help to simplify the work of non-experts in water chemistry."}],"page":"1960-1969","keyword":["Acid-base equilibria","Carboxylic acids","Dissociation constants","pH calculation software","Uncertainty assessment"],"publisher":"Wiley","type":"scientific_journal_article","date_updated":"2025-06-26T07:50:29Z","doi":"10.1002/cite.202300082","external_id":{"isi":["001073579300001"]},"quality_controlled":"1","issue":"12"},{"oa":"1","_id":"7090","publication":"Brewing science","main_file_link":[{"url":"https://www.researchgate.net/publication/360806853_Approach_to_an_inline_monitoring_of_the_heat_impact_in_a_high_temperature_short_time_treatment_HTST_of_juice_with_the_help_of_a_chemical_marker","open_access":"1"}],"title":"Approach to an inline monitoring of the heat impact in a high temperature short time treatment (HTST) of juice with the help of a chemical marker","intvolume":"        75","author":[{"first_name":"Imke","id":"58425","last_name":"Weishaupt","full_name":"Weishaupt, Imke"},{"first_name":"Peter","full_name":"Neubauer, Peter","last_name":"Neubauer"},{"first_name":"Jan","last_name":"Schneider","id":"13209","full_name":"Schneider, Jan","orcid":"0000-0001-6401-8873"}],"isi":"1","publication_identifier":{"eissn":["1613-2041"],"issn":["1866-5195 "]},"citation":{"ufg":"<b>Weishaupt, Imke/Neubauer, Peter/Schneider, Jan</b>: Approach to an inline monitoring of the heat impact in a high temperature short time treatment (HTST) of juice with the help of a chemical marker, in: <i>Brewing science</i> 75 (2022), H. 1/2,  S. 1–8.","chicago-de":"Weishaupt, Imke, Peter Neubauer und Jan Schneider. 2022. Approach to an inline monitoring of the heat impact in a high temperature short time treatment (HTST) of juice with the help of a chemical marker. <i>Brewing science</i> 75, Nr. 1/2: 1–8. doi:<a href=\"https://doi.org/10.23763/BrSc21-20weishaupt\">10.23763/BrSc21-20weishaupt</a>, .","short":"I. Weishaupt, P. Neubauer, J. Schneider, Brewing Science 75 (2022) 1–8.","mla":"Weishaupt, Imke, et al. “Approach to an Inline Monitoring of the Heat Impact in a High Temperature Short Time Treatment (HTST) of Juice with the Help of a Chemical Marker.” <i>Brewing Science</i>, vol. 75, no. 1/2, 2022, pp. 1–8, <a href=\"https://doi.org/10.23763/BrSc21-20weishaupt\">https://doi.org/10.23763/BrSc21-20weishaupt</a>.","apa":"Weishaupt, I., Neubauer, P., &#38; Schneider, J. (2022). Approach to an inline monitoring of the heat impact in a high temperature short time treatment (HTST) of juice with the help of a chemical marker. <i>Brewing Science</i>, <i>75</i>(1/2), 1–8. <a href=\"https://doi.org/10.23763/BrSc21-20weishaupt\">https://doi.org/10.23763/BrSc21-20weishaupt</a>","havard":"I. Weishaupt, P. Neubauer, J. Schneider, Approach to an inline monitoring of the heat impact in a high temperature short time treatment (HTST) of juice with the help of a chemical marker, Brewing Science. 75 (2022) 1–8.","chicago":"Weishaupt, Imke, Peter Neubauer, and Jan Schneider. “Approach to an Inline Monitoring of the Heat Impact in a High Temperature Short Time Treatment (HTST) of Juice with the Help of a Chemical Marker.” <i>Brewing Science</i> 75, no. 1/2 (2022): 1–8. <a href=\"https://doi.org/10.23763/BrSc21-20weishaupt\">https://doi.org/10.23763/BrSc21-20weishaupt</a>.","bjps":"<b>Weishaupt I, Neubauer P and Schneider J</b> (2022) Approach to an Inline Monitoring of the Heat Impact in a High Temperature Short Time Treatment (HTST) of Juice with the Help of a Chemical Marker. <i>Brewing science</i> <b>75</b>, 1–8.","din1505-2-1":"<span style=\"font-variant:small-caps;\">Weishaupt, Imke</span> ; <span style=\"font-variant:small-caps;\">Neubauer, Peter</span> ; <span style=\"font-variant:small-caps;\">Schneider, Jan</span>: Approach to an inline monitoring of the heat impact in a high temperature short time treatment (HTST) of juice with the help of a chemical marker. In: <i>Brewing science</i> Bd. 75, Carl (2022), Nr. 1/2, S. 1–8","ama":"Weishaupt I, Neubauer P, Schneider J. Approach to an inline monitoring of the heat impact in a high temperature short time treatment (HTST) of juice with the help of a chemical marker. <i>Brewing science</i>. 2022;75(1/2):1-8. doi:<a href=\"https://doi.org/10.23763/BrSc21-20weishaupt\">10.23763/BrSc21-20weishaupt</a>","van":"Weishaupt I, Neubauer P, Schneider J. Approach to an inline monitoring of the heat impact in a high temperature short time treatment (HTST) of juice with the help of a chemical marker. Brewing science. 2022;75(1/2):1–8.","ieee":"I. Weishaupt, P. Neubauer, and J. Schneider, “Approach to an inline monitoring of the heat impact in a high temperature short time treatment (HTST) of juice with the help of a chemical marker,” <i>Brewing science</i>, vol. 75, no. 1/2, pp. 1–8, 2022, doi: <a href=\"https://doi.org/10.23763/BrSc21-20weishaupt\">10.23763/BrSc21-20weishaupt</a>."},"publication_status":"published","volume":75,"date_created":"2022-02-28T10:50:48Z","language":[{"iso":"eng"}],"keyword":["near infrared spectroscopy","apple juice","pasteurisation","acid hydrolytic sucrose degradation","inline measure-ment of heat input","pasteurisation units"],"abstract":[{"lang":"eng","text":"The conventional method for the determination of the lethal heat load during pasteurisation (expressed in so-called pasteurisation units (PU)) by measuring temperature and flow rate provides known inaccuracies and requires safety margins in terms of a planned over-pasteurisation to the detriment of the product quality. Based on the hypothesis that chemical conversions correlate with applied heat input, despite the differences in reaction kinetics between chemical conversion and microbiological inactivation, inline near infrared spectroscopy (NIRS) was investigated to identify and quantify applied PU. Acid hydrolytic sucrose degradation was confirmed a favourable marker reaction. In a first step by still using offline analytics (HPLC) and a calculation the feasibility and plausibility in principle could be proved. Compared with conventional PU deviation of only 0.3% were found when using the chemical marker reaction. However, the inline application using NIRS showed too high variations. The too low accuracy of the NIRS model for the sucrose measurement was identified of being the cause for failing the overall goal. Improvements in the inline determination seem to be promising."}],"page":"1-8","year":"2022","user_id":"83778","department":[{"_id":"DEP4018"},{"_id":"DEP1308"},{"_id":"DEP4028"}],"status":"public","issue":"1/2","date_updated":"2026-03-12T11:52:14Z","doi":"10.23763/BrSc21-20weishaupt","external_id":{"isi":["000858906600001"]},"type":"journal_article","publisher":"Carl"},{"status":"public","publication":"Instrumentation Science & Technology","year":2011,"user_id":"15514","department":[{"_id":"DEP4023"},{"_id":"DEP4009"}],"abstract":[{"text":"\r\nThe pentacyclic triterpenes oleanolic acid (OA) and ursolic acid (UA) in Salvia triloba are attractive ingredients for cosmetic and pharmaceutical formulations. These triterpenoids are constitution isomers and differ only in the position of one methyl group in their chemical structures. Therefore it is difficult to achieve a baseline separation by standard RP-HPLC systems. Another challenge is that the complex plant contains a large variety of similar compounds. To achieve precise results for the target molecules, these compounds should be removed prior to analysis. Due to the large application of these two triterpenes, a fast quantification method is favored. If the triterpenes are extracted with aqueous two-phase systems, the target substances are enriched in a surfactant-rich phase. For this application, it is desirable to develop a method that is capable of quantifying both triterpenes directly by RP-HPLC without additional purification steps.\r\n\r\nThe optimal chromatographic conditions for pure substances as well as for crude surfactant-containing extracts were accomplished on a Nucleodur C18 ISIS column by isocratic elution with methanol/water/acetic acid/triethanolamine (90:10:0.04:0.02 v/v) as the mobile phase and a column temperature of 10°C. The flow rate was 0.6 mL/min, and the detection wavelength was 210 nm. With these parameters, a baseline separation was achieved and the calibration curve showed a very good linearity (R2 > 0.999 for OA and UA) within the test range. The method is simple, rapid, and reliable for the quantification of crude extracts from plant material.\r\n","lang":"eng"}],"page":"407-418","_id":"5406","keyword":["oleanolic acid","Salvia triloba","surfactants","triterpenes","ursolic acid"],"citation":{"havard":"P. Schneider, S.S. Hosseiny, F. Bischoff, U. Müller, H.J. Bart, K. Schlitter, V. Jordan, SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM, Instrumentation Science &#38; Technology. (2011) 407–418.","short":"P. Schneider, S.S. Hosseiny, F. Bischoff, U. Müller, H.J. Bart, K. Schlitter, V. Jordan, Instrumentation Science &#38; Technology (2011) 407–418.","apa":"Schneider, P., Hosseiny, S. S., Bischoff, F., Müller, U., Bart, H. J., Schlitter, K., &#38; Jordan, V. (2011). SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM. <i>Instrumentation Science &#38; Technology</i>, 407–418. <a href=\"https://doi.org/10.1080/10739149.2011.602167\">https://doi.org/10.1080/10739149.2011.602167</a>","mla":"Schneider, Pia, et al. “SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM.” <i>Instrumentation Science &#38; Technology</i>, 2011, pp. 407–18, doi:<a href=\"https://doi.org/10.1080/10739149.2011.602167\">10.1080/10739149.2011.602167</a>.","ufg":"<b>Schneider, Pia et. al. (2011)</b>: SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM, in: <i>Instrumentation Science &#38; Technology</i>, S. 407–418.","chicago-de":"Schneider, Pia, S. S. Hosseiny, F. Bischoff, Ulrich Müller, H. J. Bart, K. Schlitter und V. Jordan. 2011. SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM. <i>Instrumentation Science &#38; Technology</i>: 407–418. doi:<a href=\"https://doi.org/10.1080/10739149.2011.602167,\">10.1080/10739149.2011.602167,</a> .","ieee":"P. Schneider <i>et al.</i>, “SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM,” <i>Instrumentation Science &#38; Technology</i>, pp. 407–418, 2011.","ama":"Schneider P, Hosseiny SS, Bischoff F, et al. SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM. <i>Instrumentation Science &#38; Technology</i>. 2011:407-418. doi:<a href=\"https://doi.org/10.1080/10739149.2011.602167\">10.1080/10739149.2011.602167</a>","van":"Schneider P, Hosseiny SS, Bischoff F, Müller U, Bart HJ, Schlitter K, et al. SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM. Instrumentation Science &#38; Technology. 2011;407–18.","bjps":"<b>Schneider P <i>et al.</i></b> (2011) SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM. <i>Instrumentation Science &#38; Technology</i> 407–418.","din1505-2-1":"<span style=\"font-variant:small-caps;\">Schneider, Pia</span> ; <span style=\"font-variant:small-caps;\">Hosseiny, S. S.</span> ; <span style=\"font-variant:small-caps;\">Bischoff, F.</span> ; <span style=\"font-variant:small-caps;\">Müller, Ulrich</span> ; <span style=\"font-variant:small-caps;\">Bart, H. J.</span> ; <span style=\"font-variant:small-caps;\">Schlitter, K.</span> ; <span style=\"font-variant:small-caps;\">Jordan, V.</span>: SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM. In: <i>Instrumentation Science &#38; Technology</i> (2011), S. 407–418","chicago":"Schneider, Pia, S. S. Hosseiny, F. Bischoff, Ulrich Müller, H. J. Bart, K. Schlitter, and V. Jordan. “SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM.” <i>Instrumentation Science &#38; Technology</i>, 2011, 407–18. <a href=\"https://doi.org/10.1080/10739149.2011.602167\">https://doi.org/10.1080/10739149.2011.602167</a>."},"publication_status":"published","language":[{"iso":"eng"}],"date_created":"2021-04-07T12:32:48Z","type":"journal_article","author":[{"last_name":"Schneider","id":"75629","full_name":"Schneider, Pia","first_name":"Pia"},{"first_name":"S. S.","last_name":"Hosseiny","full_name":"Hosseiny, S. S."},{"first_name":"F.","full_name":"Bischoff, F.","last_name":"Bischoff"},{"first_name":"Ulrich","full_name":"Müller, Ulrich","id":"12119","last_name":"Müller"},{"first_name":"H. J.","full_name":"Bart, H. J.","last_name":"Bart"},{"last_name":"Schlitter","full_name":"Schlitter, K.","first_name":"K."},{"full_name":"Jordan, V.","last_name":"Jordan","first_name":"V."}],"publication_identifier":{"eissn":["1525-6030"],"issn":["1073-9149"]},"date_updated":"2023-03-15T13:49:59Z","doi":"10.1080/10739149.2011.602167","title":"SURFACTANT MEDIATED EXTRACTION OF TRITERPENES AND THEIR DIRECT HPLC ANALYSIS FROM THE MICELLAR SYSTEM"}]