<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">zldm</journal-id><journal-title-group><journal-title xml:lang="ru">Заводская лаборатория. Диагностика материалов</journal-title><trans-title-group xml:lang="en"><trans-title>Industrial laboratory. Diagnostics of materials</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1028-6861</issn><issn pub-type="epub">2588-0187</issn><publisher><publisher-name>ООО «Издательство «ТЕСТ-ЗЛ»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26896/1028-6861-2020-86-2-15-22</article-id><article-id custom-type="elpub" pub-id-type="custom">zldm-1154</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>АНАЛИЗ ВЕЩЕСТВА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SUBSTANCES ANALYSIS</subject></subj-group></article-categories><title-group><article-title>Методические особенности спектрофотометрического определения белков в биологических жидкостях по реакции с бромпирогаллоловым красным</article-title><trans-title-group xml:lang="en"><trans-title>Methodological features of the spectrophotometric determination of proteins in biological fluids using reactions with brompyrogallol red</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Починок</surname><given-names>Т. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Pochinok</surname><given-names>T. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Татьяна Борисовна Починок</p><p>350040, Краснодар, ул. Ставропольская, д. 149</p></bio><bio xml:lang="en"><p>Taniana B. Pochinok</p><p>149, Stavropol’skaya st., Krasnodar, 350040</p></bio><email xlink:type="simple">pochinokt@chem.kubsu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Анисимович</surname><given-names>П. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Anisimovich</surname><given-names>P. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Полина Владимировна Анисимович</p><p>350040, Краснодар, ул. Ставропольская, д. 149</p></bio><bio xml:lang="en"><p>Polina V. Anisimovich</p><p>149, Stavropol’skaya st., Krasnodar, 350040</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Темердашев</surname><given-names>З. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Temerdashev</surname><given-names>Z. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Зауаль Ахлоович Темердашев</p><p>350040, Краснодар, ул. Ставропольская, д. 149</p></bio><bio xml:lang="en"><p>Zaual A. Temerdashev</p><p>149, Stavropol’skaya st., Krasnodar, 350040</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Кубанский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kuban State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>27</day><month>02</month><year>2020</year></pub-date><volume>86</volume><issue>2</issue><fpage>15</fpage><lpage>22</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Починок Т.Б., Анисимович П.В., Темердашев З.А., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Починок Т.Б., Анисимович П.В., Темердашев З.А.</copyright-holder><copyright-holder xml:lang="en">Pochinok T.B., Anisimovich P.V., Temerdashev Z.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.zldm.ru/jour/article/view/1154">https://www.zldm.ru/jour/article/view/1154</self-uri><abstract><p>При проведении диагностических исследований результаты определения общего белка в биологических жидкостях зависят от аминокислотного состава присутствующих в них белков. В работе обсуждены некоторые аспекты спектрофотометрического определения белков в биологических жидкостях, в частности, особенности методики, основанной на реакции белков с бромпирогаллоловым красным (БПГК), важнейшим преимуществом которого является высокая и одинаковая чувствительность красителя к белкам альбуминовой и глобулиновой фракций. Это позволяет минимизировать погрешности, возникающие за счет несовпадения белкового состава анализируемых проб и используемых градуировочных растворов. Цель работы — исследование влияния условий и сроков хранения раствора БПГК на его аналитические свойства при спектрофотометрическом определении белков в биологических жидкостях. Стабильность оптических и аналитических свойств растворов реагента изучена с использованием критериев Фишера и Стьюдента при различных температурах хранения растворов, содержащих в качестве стабилизатора этанол или бензоат натрия. Проверку правильности определения общего белка по предложенной методике проводили методом «введено – найдено», вводя добавки стандартных растворов, приготовленных из калибраторов «Общий белок» или «Альбумин». Разработанная методика спектрофотометрического определения белков в моче по реакции с бромпирогаллоловым красным апробирована при анализе реальных объектов, метрологически аттестована и внесена в Федеральный реестр аттестованных методик выполнения измерений. Проведенные аналитические и метрологические исследования показали, что методика определения белков с использованием реагента на основе БПГК позволяет определять белки альбуминовой и глобулиновой фракций в биологических жидкостях человека с высокой и одинаковой чувствительностью. Для увеличения сроков хранения раствора реагента и сохранения его аналитических свойств рекомендуется использовать этанол в качестве стабилизатора.</p></abstract><trans-abstract xml:lang="en"><p>Determination of proteins in biological fluids is rather important for diagnostics in current clinical practice. The results of total protein determination depend on the amino-acid composition of the proteins present in the biological fluid. We discuss some aspects of the spectrophotometric determination of proteins in biological fluids, in particular, the methodological features of the technique based on the reaction of proteins with brompyrogallol red (BPGR). The most important advantage of BPGR in the determination of proteins in biological fluids is rather high and equal sensitivity of the dye to the proteins of albumin and globulin fractions, thus minimizing the errors attributed to the mismatch of the protein composition of the analyzed samples and calibration solutions used. The goal of the work is to study the impact of conditions and shelf life of the BPGR solution on the analytical properties of the solution in the spectrophotometric determination of proteins in biological fluids. Stability of the optical and analytical properties of BPGR solutions are studied using Fisher and Student criteria under conditions of different storage temperatures and nature of the stabilizer (ethanol or sodium benzoate) in the reagent solutions. Verification of the correctness of the total protein determination by the proposed method was carried out in spike tests. The introduced additives of standard solutions are prepared from the «Total protein» or «Albumin» calibrators. The developed method of the spectrophotometric determination of the mass concentration of proteins in the urine by the reaction with bromopyrogallol red was tested on real objects, metrologically certified and listed in the Federal register of certified measurement techniques. Analytical and metrological studies have shown that the developed method of protein determination with a reagent based on BPGR provides equal and high sensitivity of determination of albumin and globulin protein fractions in human biological fluids. To increase the shelf life of the reagent solution and preserve the analytical properties of the solution, we recommend to use ethanol as a stabilizer.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>общий белок</kwd><kwd>альбумин</kwd><kwd>глобулины</kwd><kwd>спектрофотометрический метод</kwd><kwd>бромпирогаллоловый красный</kwd><kwd>биологические жидкости</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Schleicher E., Wieland O. H. Evaluation of the Bradford method for protein determination in body fluids / J. Clin. Chem. Clin. Biochem. 1978. Vol. 16. N 9. P. 533 – 534.</mixed-citation><mixed-citation xml:lang="en">Schleicher E., Wieland O. H. Evaluation of the Bradford method for protein determination in body fluids / J. Clin. Chem. Clin. Biochem. 1978. Vol. 16. N 9. P. 533 – 534.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Marshall T., Williams K. M. Total protein determination in urine: elimination of a differential response between the coomassie blue and pyrogallol red protein dye-binding assays / Clin. Chem. 2000. Vol. 46. N 3. P. 392 – 398.</mixed-citation><mixed-citation xml:lang="en">Marshall T., Williams K. M. Total protein determination in urine: elimination of a differential response between the coomassie blue and pyrogallol red protein dye-binding assays / Clin. Chem. 2000. Vol. 46. N 3. P. 392 – 398.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Samudra P. B., Swagata P., Shakuntala G., et al. Interference of sugars in the Coomassie Blue G dye binding assay of proteins / Anal. Biochem. 2009. Vol. 386. N 1. P. 113 – 115. DOI: 10.1016/j.ab.2008.12.006.</mixed-citation><mixed-citation xml:lang="en">Samudra P. B., Swagata P., Shakuntala G., et al. Interference of sugars in the Coomassie Blue G dye binding assay of proteins / Anal. Biochem. 2009. Vol. 386. N 1. P. 113 – 115. DOI: 10.1016/j.ab.2008.12.006.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Trivedi V. D. On the role of lysine residues in the bromophenol blue — Albumin interaction / Ital. J. Biochem. 1997. Vol. 46. N 2. P. 67 – 73.</mixed-citation><mixed-citation xml:lang="en">Trivedi V. D. On the role of lysine residues in the bromophenol blue — Albumin interaction / Ital. J. Biochem. 1997. Vol. 46. N 2. P. 67 – 73.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Vatassery G. T., Krezowski A. M., Sheridan M. A. Comparison of manual methods of determination of albumin in human cerebrospinal fluid by the bromcresol green and immuno-precipitation methods / Clin. Biochem. 1980. Vol. 13. N 2. P. 78 – 80. DOI: 10.1016/S0009-9120(80)91233-3.</mixed-citation><mixed-citation xml:lang="en">Vatassery G. T., Krezowski A. M., Sheridan M. A. Comparison of manual methods of determination of albumin in human cerebrospinal fluid by the bromcresol green and immuno-precipitation methods / Clin. Biochem. 1980. Vol. 13. N 2. P. 78 – 80. DOI: 10.1016/S0009-9120(80)91233-3.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Yalamati P., Bhongir A. V., Karra M., Beedu S. R. Comparative Analysis of Urinary Total Proteins by Bicinchoninic Acid and Pyrogallol Red Molybdate Methods / J. Clin. Diagn. Res. 2015. Vol. 9. N 8. P. 1 – 4. DOI: 10.7860/JCDR/2015/13543.6313.</mixed-citation><mixed-citation xml:lang="en">Yalamati P., Bhongir A. V., Karra M., Beedu S. R. Comparative Analysis of Urinary Total Proteins by Bicinchoninic Acid and Pyrogallol Red Molybdate Methods / J. Clin. Diagn. Res. 2015. Vol. 9. N 8. P. 1 – 4. DOI: 10.7860/JCDR/2015/13543.6313.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Ларичева Е. С., Андреев Ю. Н., Козлов А. В. Способен ли метод определения белка в моче пирогаллоловым красным претендовать на роль основного / Лабораторная диагностика. 2009. № 1. С. 24 – 32.</mixed-citation><mixed-citation xml:lang="en">Laricheva E., Andreev J., Kozlov A. If a method of determining protein in the urine pyrogallol red to claim the role of principal / Klin. Lab. Diagn. 2009. N 1. P. 24 – 32 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Williams K. M., Marshall T. Protein concentration of cerebrospinal fluid by precipitation with Pyrogallol Red prior to sodium dodecyl sulphate-polyacrylamide gel electrophoresis / J. Biochem. Biophys. Methods. 2001. Vol. 47. N 3. P. 197 – 207. DOI: 10.1016/S0165-022X(00)00135-4.</mixed-citation><mixed-citation xml:lang="en">Williams K. M., Marshall T. Protein concentration of cerebrospinal fluid by precipitation with Pyrogallol Red prior to sodium dodecyl sulphate-polyacrylamide gel electrophoresis / J. Biochem. Biophys. Methods. 2001. Vol. 47. N 3. P. 197 – 207. DOI: 10.1016/S0165-022X(00)00135-4.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Lynch K. M., Sellers T. S., Gossett K. A. Evaluation of an automted pyrogallol red-molybdate method for the measurement of urinary protein in rats / Eur. J. Clin. Chem. Clin Biochem. 1996. Vol. 34. N 7. P. 569 – 571.</mixed-citation><mixed-citation xml:lang="en">Lynch K. M., Sellers T. S., Gossett K. A. Evaluation of an automted pyrogallol red-molybdate method for the measurement of urinary protein in rats / Eur. J. Clin. Chem. Clin Biochem. 1996. Vol. 34. N 7. P. 569 – 571.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Пупкова В. И., Прасолова Л. М. Метод с пирогаллоловым красным — альтернатива традиционным методам определения белка в моче / Клин. лаб. диагностика. 2007. № 6. С. 17 – 21.</mixed-citation><mixed-citation xml:lang="en">Pupkova V. I., Prasolova L. M. The method with pyrogallol red — an alternative to the traditional methods of determining protein in the urine / Klin. Lab. Diagn. 2007. N 6. P. 17 – 21 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Marshall T., Williams K. M. Interference in the Coomassie Brilliant Blue and Pyrogallol Red protein dye-binding assays is increased by the addition of sodium dodecyl sulfate to the dye reagents / Anal Biochem. 2004. Vol. 331. N 2. P. 255 – 259. DOI: 10.1016/j.ab.2004.04.029.</mixed-citation><mixed-citation xml:lang="en">Marshall T., Williams K. M. Interference in the Coomassie Brilliant Blue and Pyrogallol Red protein dye-binding assays is increased by the addition of sodium dodecyl sulfate to the dye reagents / Anal Biochem. 2004. Vol. 331. N 2. P. 255 – 259. DOI: 10.1016/j.ab.2004.04.029.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Da Silva A. S., Falkenberg M. Analytical interference of quinolone antibiotics and quinine derived drugs on urinary protein determined by reagent strips and the pyrogallol red-molybdate protein assay / Clin. Biochem. 2011. Vol. 44. N 12. P. 1000 – 1004. DOI: 10.1016/j.clinbiochem.2011.05.018.</mixed-citation><mixed-citation xml:lang="en">Da Silva A. S., Falkenberg M. Analytical interference of quinolone antibiotics and quinine derived drugs on urinary protein determined by reagent strips and the pyrogallol red-molybdate protein assay / Clin. Biochem. 2011. Vol. 44. N 12. P. 1000 – 1004. DOI: 10.1016/j.clinbiochem.2011.05.018.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Yanga Jui-Yi., Chiena Tzu-I., Lua Jin-Ying, Kaoa Jau-Tsuen. Heparin interference in the cerebrospinal fluid protein assay measured with a pyrogallol red-molybdate complex / Clin. Chim. Acta. 2009. Vol. 408. N 1 – 2. P. 75 – 78. DOI: 10.1016/j.cca.2009.07.011.</mixed-citation><mixed-citation xml:lang="en">Yanga Jui-Yi., Chiena Tzu-I., Lua Jin-Ying, Kaoa Jau-Tsuen. Heparin interference in the cerebrospinal fluid protein assay measured with a pyrogallol red-molybdate complex / Clin. Chim. Acta. 2009. Vol. 408. N 1 – 2. P. 75 – 78. DOI: 10.1016/j.cca.2009.07.011.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Fujita Y., Mori I., Kitano S. Color reaction between Pyrogallol Red — molybdenium(VI) complex and protein / J. Bunseki Kagaku. 1983. Vol. 32. P. 379 – 386. DOI: 10.2116/bunsekikagaku.32.12_E379.</mixed-citation><mixed-citation xml:lang="en">Fujita Y., Mori I., Kitano S. Color reaction between Pyrogallol Red — molybdenium(VI) complex and protein / J. Bunseki Kagaku. 1983. Vol. 32. P. 379 – 386. DOI: 10.2116/bunsekikagaku.32.12_E379.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Orsonneau J. L., Douet P., Massoubre C., et al. An improved pyrogallol red-molybdate method for the determining total urinary protein / Clin. Chem. 1989. Vol. 35. P. 2233 – 2235.</mixed-citation><mixed-citation xml:lang="en">Orsonneau J. L., Douet P., Massoubre C., et al. An improved pyrogallol red-molybdate method for the determining total urinary protein / Clin. Chem. 1989. Vol. 35. P. 2233 – 2235.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Watanabe N., Kamel S., Ohkubo A., et al. Urinary protein as measured with a pyrogallol-red-molybdate complex manually and in a Hitachi 726 automated analyzer / Clin. Chem. 1986. Vol. 32. P. 1551 – 1154. DOI: 10.1371/journal.pone.0100768.</mixed-citation><mixed-citation xml:lang="en">Watanabe N., Kamel S., Ohkubo A., et al. Urinary protein as measured with a pyrogallol-red-molybdate complex manually and in a Hitachi 726 automated analyzer / Clin. Chem. 1986. Vol. 32. P. 1551 – 1154. DOI: 10.1371/journal.pone.0100768.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Lefevre G., Bloch S., Le Bricon T., Billier S., et al. Influence of protein composition on total urinary protein determined by pyrocatechol-violet (UPRO Vitros) and pyrogallol red dye binding methods / J. Clin. Lab. Anal. 2001. Vol. 15. N 1. P. 40 – 42. DOI: 10.1002/1098-2825(2001)15:1&lt;40::AID-JCLA8&gt;3.0.CO;2-0.</mixed-citation><mixed-citation xml:lang="en">Lefevre G., Bloch S., Le Bricon T., Billier S., et al. Influence of protein composition on total urinary protein determined by pyrocatechol-violet (UPRO Vitros) and pyrogallol red dye binding methods / J. Clin. Lab. Anal. 2001. Vol. 15. N 1. P. 40 – 42. DOI: 10.1002/1098-2825(2001)15:1&lt;40::AID-JCLA8&gt;3.0.CO;2-0.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Marshall T., Williams K. M. Protein determination in cerebrospinal fluid by protein dye-binding assay / Brit. J. Biomed. Sci. 2000. Vol. 57. N 4. P. 281 – 286.</mixed-citation><mixed-citation xml:lang="en">Marshall T., Williams K. M. Protein determination in cerebrospinal fluid by protein dye-binding assay / Brit. J. Biomed. Sci. 2000. Vol. 57. N 4. P. 281 – 286.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Artiss J. D., Thibert R. J., Zak B. Spectrophotometric study of total protein-albumin methods applied to cerebrospinal fluid / 1981. Clin. Biochem. Vol. 14. N 1. P. 32 – 38. DOI: 10.1016/0009-9120(81)90165-X.</mixed-citation><mixed-citation xml:lang="en">Artiss J. D., Thibert R. J., Zak B. Spectrophotometric study of total protein-albumin methods applied to cerebrospinal fluid / 1981. Clin. Biochem. Vol. 14. N 1. P. 32 – 38. DOI: 10.1016/0009-9120(81)90165-X.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Миллер В. Г., Брунс Д. Е., Хортин Г. Л. и др. Современное состояние вопросов измерения и представления результатов выделения альбумина с мочой / Клин. лаб. диагностика. 2012. № 3. С. 43 – 53. DOI: 10.1373/clinchem.2008.106567.</mixed-citation><mixed-citation xml:lang="en">Miller V. G., Bruns D. E., Hortin G. L., et al. Current issues in measurement and reporting of urinary albumin excretion / Klin. Lab. Diagn. 2012. N 3. P. 43 – 53. DOI: 10.1373/clinchem.2008.106567 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Dube J., Girouard J., Leclerc P., Douville P. Problems with the estimation of urine protein by automated assays / Clin. Biochem. 2005. Vol. 38. P. 479 – 485. DOI: 10.1016/j.clinbiochem.2004.12.010.</mixed-citation><mixed-citation xml:lang="en">Dube J., Girouard J., Leclerc P., Douville P. Problems with the estimation of urine protein by automated assays / Clin. Biochem. 2005. Vol. 38. P. 479 – 485. DOI: 10.1016/j.clinbiochem.2004.12.010.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Negin S., Wayne F. P., Mark J. L., Shepro D. Pyrogallol Red — molybdate: A reversible, metal chelate stain for detection of proteins immobilized on membrane supports / Electrophoresis. 1996. Vol. 17. P. 678 – 693. DOI: 10.1002/elps.1150170411.</mixed-citation><mixed-citation xml:lang="en">Negin S., Wayne F. P., Mark J. L., Shepro D. Pyrogallol Red — molybdate: A reversible, metal chelate stain for detection of proteins immobilized on membrane supports / Electrophoresis. 1996. Vol. 17. P. 678 – 693. DOI: 10.1002/elps.1150170411.</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Анисимович П. В., Починок Т. Б., Токарева Е. В. Спектрофотометрическое определение белков в биологических жидкостях / Журн. аналит. химии. 2017. Т. 72. № 12. С. 1069 – 1077. DOI: 10.7868/S0044450217120039.</mixed-citation><mixed-citation xml:lang="en">Anisimovich P. V., Pochinok T. B., Tokareva E. V. Spectrophotometric determination of proteins in biological fluids / J. Anal. Chem. 2017. Vol. 72. N 12. P. 1212 – 11218. DOI: 10.1134/S1061934817120024.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
