estimation of phosphorus by molybdate method
Planta. Naves LDP, Rodrigues PB, Bertechini AG, Corra AD, De Oliveira DH, De Oliveira EC, Duarte WF, Cunha MRRD. The phosphorus cycle is a simple method to comprehend the role phosphorus plays in the environment. Food Eng Prog. Draw a neatly labeled diagram of chloroplast found in leaf, and its role in photosynthesis? Consequently, the amounts (e.g., volume, weight) of samples required for NMR-based analyses are larger than those required when using other analytical methods. We also use third-party cookies that help us analyze and understand how you use this website. The cookie is used to store the user consent for the cookies in the category "Performance". Wieczorek, D., yszka-Haberecht, B., Kafka, A. et al. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. The Burbano group [74] proposed a methodology for purification of legume extracts using a strong anion exchange column to separate InsP3 to InsP6 from lower inositol phosphates (InsP1 and InsP2) and analysis by ion-pair chromatography on a C18 reversed-phase column. HPLC analysis can easily be set up for automation with commercially available equipment for a large number of samples. In: Arlington V, editor. sion of organic into inorganic phosphorus prior to the de- velopment of a colored complex (1 -5). vol. However, the nature of the NMR measurements required for these research tasks, particularly regarding the hardware requirements, the detection scheme, and the sensitivity of the analysis, is extremely variable [77]. Your US state privacy rights, Why is the anterior pituitary considered to be a true endocrine gland, whereas the posterior pituitary is not? investigated the P species in plants from a natural vegetation system dominated by brackens and bluebells [93]. Set IV 4 ml of KH2PO4 soln. ; by (2), 1.626 and 1.631 per cent. water. NMR offers an array of detection strategies that can be tailored to the type of plant sample and the metabolic problem that is being addressed. In recent decades, 31P NMR spectroscopy has been widely used to simultaneously identify and quantify all phosphorus-containing compounds. Phytochemistry. Give an example. Similar benefits, regarding sensitivity of determinations, are obtained when XRF, SIMS or nanoSIMSmore expensive techniques of imaging the presence of phosphorus in biological matrices have been used. Current scientific reports indicate that inorganic polyphosphates (polyP) may also exist in plants [53]. water. Phospho-molybdate reacts with amino-naphthol-sulphonic acid and produces a molybdenum complex which forms a blue- coloured solution. The ICP-OES method is relatively simple, time-consuming and has good linearity. Front Microbiol. Phosphorus-31 Nuclear Magnetic Resonance Spectral Assignments of Phosphorus Compounds in Soil NaOHEDTA Extracts. Micro Colorimetric Studies: Ii. Estimation of Phosphorus: Molybdic Acid The complexity of chemical composition of plant tissues treated as the analytical matrices is thought to be the main cause why there is no one answer, how appropriate phosphorus compounds may be determined qualitatively and quantitatively. PubMed Since it has some drawbacks, such as being the least sensitive of the detectors, it can detect only the changes in the refractive index and must be used only in isocratic systems. Appl Environ Microbiol. Necessary cookies are absolutely essential for the website to function properly. 2013;138:23441. Correspondence to 2020;102:50716. DISCUSSION The method described in this paper for the determination of phos- phate is simple, uses wavelengths available on low-priced spectrophotom- eters, and reagents that are all . To request permission to reproduce material from this article, please go to the White PJ, Veneklaas EJ. 1975;47:18019. The best answers are voted up and rise to the top. Geoderma. Determination of phosphorus compounds in plant tissues: from colourimetry to advanced instrumental analytical chemistry, https://doi.org/10.1186/s13007-022-00854-6, http://creativecommons.org/licenses/by/4.0/, http://creativecommons.org/publicdomain/zero/1.0/. Stover FS, Brill RV. The molybdenum blue method can be automated by flow injection analysis [43] and has a broad calibration range of linearity at high and very low concentrations (0.0041.2mg Pi L1). The authors concluded that exhaustive analysis of phosphorus metabolites in seeds requires a minimum of four extracts, which means an aqueous, acidic, nucleotide, and phospholipid extraction procedure. Plant Physiol. 2004;17:22733. of phosphorus) + 3 ml of dist. Simultaneous determination of nitrate, chloride, sulfate, and phosphate in plant materials by ion chromatography. The same author proposed a high-performance anion-exchange chromatographic method (HPAEC), in which an average relative response factor of penta- to hexasphosphates was determined by further research on InsP6 hydrolysis, and accurate analysis of InsP6 purity was also carried out. 2010;65:31620. Under a sufficient P supply, 8595% of the cellular P is found in the vacuole, and only 515% constitutes the cytoplasmic pool [7]. 2.2Ammonium molybdate and antimony potassium tartrate react in an acid medium with dilute solutions of phosphorus to form an antimony-phospho-molybdate complex. Therefore, the development of methods that somehow balance the examination of various P compounds and their quantification during the same run, simplify the sample pretreatment and guarantee the robustness of the determination process, is still highly desirable. PDF Method 365.3: Phosphorous, All Forms (Colorimetric, Ascorbic Acid, Two Direct analysis of plant materials and comparison of extraction processes using ICP-AES. One of the most sensitive methods for the determination of phosphate is the colourimetric method with malachite green, also called the micromethod, because it allows the determination of even nanomolar concentrations of phosphorus in samples. 1. Low concentrations of phosphosugars and other phosphorus metabolites were found in all aqueous and acidic extractions. They found that the metabolism of phosphorus was temperature-dependent and under the influence of illumination and hormones. The next step was performed by Cai and coworkers, who combined 31P liquid and solid-state NMR spectroscopic methodology with a new extraction scheme and data analysis method to perform a quantitative investigation of phosphorous circulation in germinating sesame seeds in the dark and under illumination with and without the addition of a growth hormone [95]. Dorota Wieczorek. Content Guidelines 2. 2. Other monoester and diester P forms were also present in most NaOH-EDTA plant extracts. of soln.) 2019;9:7. The resulting determinations of phosphorus were as follows: By method (1), 1.622 and 1.625 per cent. 2019;11:9. 2010;96:716. Burbano C, Muzquiz M, Osagie A, Ayet G, Cuadrado C. Determination of phytate and lower inositol phosphates in Spanish legumes by HPLC methodology. 2001;52:499526. water. 2). The level of TP in plants has been reported in many studies, and it varies within the range of mg/g of dry plant tissue. Cade-Menun BJ. However, when the form of phosphorus or knowledge about the dynamics of the transformation of this element in the body of living beings is the point, nuclear magnetic spectroscopy, especially the variants of the 31P NMR technique, is much more suitable, even though the limit of detection (LOD) of this method is far higher than that obtained in other methods. 2. (c) Preparation of standard phosphate solution: 11 gm. Official Methods of Analysis. https://doi.org/10.1186/s13007-022-00854-6, DOI: https://doi.org/10.1186/s13007-022-00854-6. Van Veldhoven PP, Mannaerts GP. Summary This method estimates the relative bioavailability of inorganic ortho-phosphate (PO4-P) in soils with neutral to alkaline pH. The fraction of inorganic phosphorus (inorganic P, Pi) occurs in plants as approximately half of the total phosphorus (TP) and mainly as orthophosphates, which can be present as H3PO4, H2PO4, HPO42 and PO43, with respective pKa values of 2.12, 7.21, and 12.67. 2017;50:9991012. Plant J. of soln.). ETV-ICP-AES is a fast, inexpensive, and reliable instrumental technique, and accurate quantification can be accomplished easily by using standard aqueous solutions. KH 2 PO 4 solution (10 gm. Pfeffer PE, Tu SI, Gerasimowicz WV, Cavanaugh JR. Association of Official Analytical Chemists, 2000. p. 5758. Orthophosphate monoesters were the second major P group detected by 31P NMR in all samples, with phytate detected only in palm male inflorescences. Since phosphorus has limited methods to enter vapor form, the cycle predominately moves through organisms and ground/water phases. The estimation of InsP3-InsP5 can be conducted by using the InsP6 standard in combination with the correction factors or relative response factors of InsP3-InsP5 to InsP6. The main pools for esterified P are nucleic acids (DNA and RNA), phosphoproteins, phospholipids, sugar phosphates, and energy-rich phosphate compounds (e.g., adenosine triphosphate) [8]. instead 5 ml dist. Usually, aqueous and acidic solvents are used to extract inorganic phosphate, sugar phosphates, and phytate, whereas treatments with organic solvents are used to extract phospholipids and nucleotides. of phosphate in the unknown sample can be estimated. ICP techniques are based on the excitation of atoms and ions with plasma torch and analysis of the emitted wavelength of electromagnetic radiation, characteristic of a particular element ICP-AES (also called ICP-OES). Carvalho Vieira and Nogueira proposed a simple, rapid, and automated flow injection enzyme-spectrophotometric procedure to determine phytate in plants. Your privacy choices/Manage cookies we use in the preference centre. Noack SR, McLaughlin MJ, Smernik RJ, McBeath TM, Armstrong RD. Noack SR, McLaughlin MJ, Smernik RJ, McBeath TM, Armstrong RD. Method 300.1 Determination of inorganic anions in drinking water by ion chromatography, 1997. NMR Spectroscopy for Metabolomics Research. 2009;24:134354. However, because of limitations of AAS concerning accuracy and sensitivity, single-element analysis and narrow-range calibration and emission techniques (ICPs) are more frequently chosen by scientists to determine phosphorus in plant tissues [22]. Inorganic and organic forms of phosphorus present in plants forming the total phosphorous pool together with an indication of the methods allowing for determination of particular forms of P in plant material. Chen and Li reported the procedure that involved HPIC with the acidic system and post-column UV detection, in which all 35 possible InsP2-InsP6 isomers (excluding enantiomers) were separated into 27 peaks and the elution order of all InsP2-InsP6 isomers was definitively established [72]. The molybdenum blue reaction for the determination of orthophosphate HNO3 and then adding ammonium molybdate. What exactly is the role of antimony in estimation of - ResearchGate All authors read and approved the final manuscript. What is the easiest way to analyse the phosphorus in - ResearchGate Qualitative and Quantitative Estimation of Phosphate Solubilizing The proposed changes include extending the extraction time to 16h, lowering the centrifugation temperature to 10C and adding a matrix cleaning step to improve phytate recovery. Additionally, some plant components, such as nucleotides, can also give elevated values of InsP6 [64]. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Ebuele VO, Santoro A, Thoss V. Characterization of Plant Seeds by Phosphorus-31 Nuclear Magnetic Resonance Spectroscopy. Soil Sci Soc Am J. J Food Compos Anal. 1. Johri AK, Oelmuller R, Dua M, Yadav V, Kumar M, Tuteja N, Varma A, Bonfante P, Persson BL, Stroud RM. several locations by spectrophotometry with a molybdate complex that turns dark blue in the presence of phosphorus. TP can be determined by various spectrophotometric (molybdenum blue colourimetric method, malachite green assay) or spectrometric methods (FAAS, ETAAS, ICP-OES, ICP-AES or ICP-MS) [18] (Table 1). Planta. 2000;868:20916. of phosphorus per ml. Results by the automated method compare favorably (r = 0.96) with those obtained by Drewes . Kim HK, Choi YH, Verpoorte R. NMR-based metabolomic analysis of plants. Depending on the type of cations, the peak areas of phosphate may fluctuate. is also calculated. The other species detected in all bluebell plant parts and bracken stipes and blades were phospholipid degradation products (- and -glyp) and AMP. 1980;28:13135. 2. J Am Oil Chemists Soc. London: Collier Macmillan Publishers; 1993. Phytate phosphorus (PPhy) can be determined by the colourimetric method with the pink coloured Wade reagent (0.03% FeCl3 solution containing 0.3% sulfosalicylic acid solution, 3/1 (v/v)) in an acid medium with the formation of a complex that can be spectrophotometrically measured at 500nm. 1986;51:54750. Moreover, the latter authors demonstrated that corn root tips could be studied by 31P NMR for extended periods under both neutral and acidic conditions with little change in intracellular pH and distribution of observable phosphate-containing compounds. Eeckhout W, De Paepe M. Total phosphorus, phytate-phosphorus and phytase activity in plant feedstuffs. Phosphodiester bonds connecting repeating nucleosides form an important part of the structural skeleton of ribonucleic and deoxyribonucleic acids. Jinbong Hwang HWJ, Namgung B, Oh M, Kim S, Seo D, Kim SN, Choi Y, Nam JS, Yang MO. 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Planta. Naves LDP, Rodrigues PB, Bertechini AG, Corra AD, De Oliveira DH, De Oliveira EC, Duarte WF, Cunha MRRD. The phosphorus cycle is a simple method to comprehend the role phosphorus plays in the environment. Food Eng Prog. Draw a neatly labeled diagram of chloroplast found in leaf, and its role in photosynthesis? Consequently, the amounts (e.g., volume, weight) of samples required for NMR-based analyses are larger than those required when using other analytical methods. We also use third-party cookies that help us analyze and understand how you use this website. The cookie is used to store the user consent for the cookies in the category "Performance". Wieczorek, D., yszka-Haberecht, B., Kafka, A. et al. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. The Burbano group [74] proposed a methodology for purification of legume extracts using a strong anion exchange column to separate InsP3 to InsP6 from lower inositol phosphates (InsP1 and InsP2) and analysis by ion-pair chromatography on a C18 reversed-phase column. HPLC analysis can easily be set up for automation with commercially available equipment for a large number of samples. In: Arlington V, editor. sion of organic into inorganic phosphorus prior to the de- velopment of a colored complex (1 -5). vol. However, the nature of the NMR measurements required for these research tasks, particularly regarding the hardware requirements, the detection scheme, and the sensitivity of the analysis, is extremely variable [77]. Your US state privacy rights, Why is the anterior pituitary considered to be a true endocrine gland, whereas the posterior pituitary is not? investigated the P species in plants from a natural vegetation system dominated by brackens and bluebells [93]. Set IV 4 ml of KH2PO4 soln. ; by (2), 1.626 and 1.631 per cent. water. NMR offers an array of detection strategies that can be tailored to the type of plant sample and the metabolic problem that is being addressed. In recent decades, 31P NMR spectroscopy has been widely used to simultaneously identify and quantify all phosphorus-containing compounds. Phytochemistry. Give an example. Similar benefits, regarding sensitivity of determinations, are obtained when XRF, SIMS or nanoSIMSmore expensive techniques of imaging the presence of phosphorus in biological matrices have been used. Current scientific reports indicate that inorganic polyphosphates (polyP) may also exist in plants [53]. water. Phospho-molybdate reacts with amino-naphthol-sulphonic acid and produces a molybdenum complex which forms a blue- coloured solution. The ICP-OES method is relatively simple, time-consuming and has good linearity. Front Microbiol. Phosphorus-31 Nuclear Magnetic Resonance Spectral Assignments of Phosphorus Compounds in Soil NaOHEDTA Extracts. Micro Colorimetric Studies: Ii. Estimation of Phosphorus: Molybdic Acid The complexity of chemical composition of plant tissues treated as the analytical matrices is thought to be the main cause why there is no one answer, how appropriate phosphorus compounds may be determined qualitatively and quantitatively. PubMed Since it has some drawbacks, such as being the least sensitive of the detectors, it can detect only the changes in the refractive index and must be used only in isocratic systems. Appl Environ Microbiol. Necessary cookies are absolutely essential for the website to function properly. 2013;138:23441. Correspondence to 2020;102:50716. DISCUSSION The method described in this paper for the determination of phos- phate is simple, uses wavelengths available on low-priced spectrophotom- eters, and reagents that are all . To request permission to reproduce material from this article, please go to the White PJ, Veneklaas EJ. 1975;47:18019. The best answers are voted up and rise to the top. Geoderma. Determination of phosphorus compounds in plant tissues: from colourimetry to advanced instrumental analytical chemistry, https://doi.org/10.1186/s13007-022-00854-6, http://creativecommons.org/licenses/by/4.0/, http://creativecommons.org/publicdomain/zero/1.0/. Stover FS, Brill RV. The molybdenum blue method can be automated by flow injection analysis [43] and has a broad calibration range of linearity at high and very low concentrations (0.0041.2mg Pi L1). The authors concluded that exhaustive analysis of phosphorus metabolites in seeds requires a minimum of four extracts, which means an aqueous, acidic, nucleotide, and phospholipid extraction procedure. Plant Physiol. 2004;17:22733. of phosphorus) + 3 ml of dist. Simultaneous determination of nitrate, chloride, sulfate, and phosphate in plant materials by ion chromatography. The same author proposed a high-performance anion-exchange chromatographic method (HPAEC), in which an average relative response factor of penta- to hexasphosphates was determined by further research on InsP6 hydrolysis, and accurate analysis of InsP6 purity was also carried out. 2010;65:31620. Under a sufficient P supply, 8595% of the cellular P is found in the vacuole, and only 515% constitutes the cytoplasmic pool [7]. 2.2Ammonium molybdate and antimony potassium tartrate react in an acid medium with dilute solutions of phosphorus to form an antimony-phospho-molybdate complex. Therefore, the development of methods that somehow balance the examination of various P compounds and their quantification during the same run, simplify the sample pretreatment and guarantee the robustness of the determination process, is still highly desirable. PDF Method 365.3: Phosphorous, All Forms (Colorimetric, Ascorbic Acid, Two Direct analysis of plant materials and comparison of extraction processes using ICP-AES. One of the most sensitive methods for the determination of phosphate is the colourimetric method with malachite green, also called the micromethod, because it allows the determination of even nanomolar concentrations of phosphorus in samples. 1. Low concentrations of phosphosugars and other phosphorus metabolites were found in all aqueous and acidic extractions. They found that the metabolism of phosphorus was temperature-dependent and under the influence of illumination and hormones. The next step was performed by Cai and coworkers, who combined 31P liquid and solid-state NMR spectroscopic methodology with a new extraction scheme and data analysis method to perform a quantitative investigation of phosphorous circulation in germinating sesame seeds in the dark and under illumination with and without the addition of a growth hormone [95]. Dorota Wieczorek. Content Guidelines 2. 2. Other monoester and diester P forms were also present in most NaOH-EDTA plant extracts. of soln.) 2019;9:7. The resulting determinations of phosphorus were as follows: By method (1), 1.622 and 1.625 per cent. 2019;11:9. 2010;96:716. Burbano C, Muzquiz M, Osagie A, Ayet G, Cuadrado C. Determination of phytate and lower inositol phosphates in Spanish legumes by HPLC methodology. 2001;52:499526. water. 2). The level of TP in plants has been reported in many studies, and it varies within the range of mg/g of dry plant tissue. Cade-Menun BJ. However, when the form of phosphorus or knowledge about the dynamics of the transformation of this element in the body of living beings is the point, nuclear magnetic spectroscopy, especially the variants of the 31P NMR technique, is much more suitable, even though the limit of detection (LOD) of this method is far higher than that obtained in other methods. 2. (c) Preparation of standard phosphate solution: 11 gm. Official Methods of Analysis. https://doi.org/10.1186/s13007-022-00854-6, DOI: https://doi.org/10.1186/s13007-022-00854-6. Van Veldhoven PP, Mannaerts GP. Summary This method estimates the relative bioavailability of inorganic ortho-phosphate (PO4-P) in soils with neutral to alkaline pH. The fraction of inorganic phosphorus (inorganic P, Pi) occurs in plants as approximately half of the total phosphorus (TP) and mainly as orthophosphates, which can be present as H3PO4, H2PO4, HPO42 and PO43, with respective pKa values of 2.12, 7.21, and 12.67. 2017;50:9991012. Plant J. of soln.). ETV-ICP-AES is a fast, inexpensive, and reliable instrumental technique, and accurate quantification can be accomplished easily by using standard aqueous solutions. KH 2 PO 4 solution (10 gm. Pfeffer PE, Tu SI, Gerasimowicz WV, Cavanaugh JR. Association of Official Analytical Chemists, 2000. p. 5758. Orthophosphate monoesters were the second major P group detected by 31P NMR in all samples, with phytate detected only in palm male inflorescences. Since phosphorus has limited methods to enter vapor form, the cycle predominately moves through organisms and ground/water phases. The estimation of InsP3-InsP5 can be conducted by using the InsP6 standard in combination with the correction factors or relative response factors of InsP3-InsP5 to InsP6. The main pools for esterified P are nucleic acids (DNA and RNA), phosphoproteins, phospholipids, sugar phosphates, and energy-rich phosphate compounds (e.g., adenosine triphosphate) [8]. instead 5 ml dist. Usually, aqueous and acidic solvents are used to extract inorganic phosphate, sugar phosphates, and phytate, whereas treatments with organic solvents are used to extract phospholipids and nucleotides. of phosphate in the unknown sample can be estimated. ICP techniques are based on the excitation of atoms and ions with plasma torch and analysis of the emitted wavelength of electromagnetic radiation, characteristic of a particular element ICP-AES (also called ICP-OES). Carvalho Vieira and Nogueira proposed a simple, rapid, and automated flow injection enzyme-spectrophotometric procedure to determine phytate in plants. Your privacy choices/Manage cookies we use in the preference centre. Noack SR, McLaughlin MJ, Smernik RJ, McBeath TM, Armstrong RD. Noack SR, McLaughlin MJ, Smernik RJ, McBeath TM, Armstrong RD. Method 300.1 Determination of inorganic anions in drinking water by ion chromatography, 1997. NMR Spectroscopy for Metabolomics Research. 2009;24:134354. However, because of limitations of AAS concerning accuracy and sensitivity, single-element analysis and narrow-range calibration and emission techniques (ICPs) are more frequently chosen by scientists to determine phosphorus in plant tissues [22]. Inorganic and organic forms of phosphorus present in plants forming the total phosphorous pool together with an indication of the methods allowing for determination of particular forms of P in plant material. Chen and Li reported the procedure that involved HPIC with the acidic system and post-column UV detection, in which all 35 possible InsP2-InsP6 isomers (excluding enantiomers) were separated into 27 peaks and the elution order of all InsP2-InsP6 isomers was definitively established [72]. The molybdenum blue reaction for the determination of orthophosphate HNO3 and then adding ammonium molybdate. What exactly is the role of antimony in estimation of - ResearchGate All authors read and approved the final manuscript. What is the easiest way to analyse the phosphorus in - ResearchGate Qualitative and Quantitative Estimation of Phosphate Solubilizing The proposed changes include extending the extraction time to 16h, lowering the centrifugation temperature to 10C and adding a matrix cleaning step to improve phytate recovery. Additionally, some plant components, such as nucleotides, can also give elevated values of InsP6 [64]. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Ebuele VO, Santoro A, Thoss V. Characterization of Plant Seeds by Phosphorus-31 Nuclear Magnetic Resonance Spectroscopy. Soil Sci Soc Am J. J Food Compos Anal. 1. Johri AK, Oelmuller R, Dua M, Yadav V, Kumar M, Tuteja N, Varma A, Bonfante P, Persson BL, Stroud RM. several locations by spectrophotometry with a molybdate complex that turns dark blue in the presence of phosphorus. TP can be determined by various spectrophotometric (molybdenum blue colourimetric method, malachite green assay) or spectrometric methods (FAAS, ETAAS, ICP-OES, ICP-AES or ICP-MS) [18] (Table 1). Planta. 2000;868:20916. of phosphorus per ml. Results by the automated method compare favorably (r = 0.96) with those obtained by Drewes . Kim HK, Choi YH, Verpoorte R. NMR-based metabolomic analysis of plants. Depending on the type of cations, the peak areas of phosphate may fluctuate. is also calculated. The other species detected in all bluebell plant parts and bracken stipes and blades were phospholipid degradation products (- and -glyp) and AMP. 1980;28:13135. 2. J Am Oil Chemists Soc. London: Collier Macmillan Publishers; 1993. Phytate phosphorus (PPhy) can be determined by the colourimetric method with the pink coloured Wade reagent (0.03% FeCl3 solution containing 0.3% sulfosalicylic acid solution, 3/1 (v/v)) in an acid medium with the formation of a complex that can be spectrophotometrically measured at 500nm. 1986;51:54750. Moreover, the latter authors demonstrated that corn root tips could be studied by 31P NMR for extended periods under both neutral and acidic conditions with little change in intracellular pH and distribution of observable phosphate-containing compounds. Eeckhout W, De Paepe M. Total phosphorus, phytate-phosphorus and phytase activity in plant feedstuffs. Phosphodiester bonds connecting repeating nucleosides form an important part of the structural skeleton of ribonucleic and deoxyribonucleic acids. Jinbong Hwang HWJ, Namgung B, Oh M, Kim S, Seo D, Kim SN, Choi Y, Nam JS, Yang MO.

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estimation of phosphorus by molybdate method