Spectrophotometric Determination

Emodin, A Naturally Occuring Anthraquinone: Its Isolation and Spectrophotometric Determination in Rumex Cyprius Plant

Thu, 2015-05-14 12:05 — Mohammed A. A. Hannoun

Journal Title, Volume, Page:

Spectroscopy Letters, Volume 29, Issue 8 December 1996 , pages 1539 - 1543

Year of Publication:

1996

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019608007144#.VVSEQZP-n_I

Authors:

Mohammed A. Al-Nuri

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Nidal A. Za'tar

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Maher A. Abu-Eid

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammad A. Hannoun

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Waheed J. Al-Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Ahmad I. Hussein

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammad S. Ali-Shtayeh

Department of Biology and Biotechnology, Faculty of Science, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A new method for isolation and specrophotometric determination of emodin is presented. Emodin was isolated by thin layer chromatography (tlc) and column chromatography (cc) techniques, as an orange long crystalline substance. Emodin exhibits two absorption maxima, at 420 and 520 nm. Stability of the color and the effect of pH were studied. Beer's law is obeyed in the range 2-30 ppm.The method is applied to the determination of emodin in roots, stems, and leaves of Rumex cyprius plant.

Plumbagin, a Naturally Occurring Naphthoquinone: Its Isolation, Spectrophotometric Determination in Roots, Stems, and Leaves in Plumbago Europaea L.

Thu, 2015-05-14 11:35 — Mohammed A. A. Hannoun

Journal Title, Volume, Page:

Spectroscopy Letters, Volume 27, Issue 4 May 1994 , pages 409 - 416

Year of Publication:

1994

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019408007247?journalCode=lstl20

Authors:

Mohammed A. Al-Nuri

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammed A. Hannoun

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Nidal A. Zatar

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Maher A. Abu-Eid

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Waheed J. Al-Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Ahmad I. Hussein

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammed S. Ali-Shtayeh

Department of Biology and Biotechnology, Faculty of Science, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A new method for isolation and spectrophotometric determination of plumbagin is presented. Plumbagin was isolated by thin layer chromatography (TLC) and column chromatography (CC) techniques, as an orange tinged yellow long crystalline substances. Plumbagin exhibits two absrop-tion maxima at 410 and 510 nm. Stability of the color, pKa value, and the effect of pH were studied. Beer's law is obeyed over the range 0.9-45 ppm. The method is applied to the determination of plumbagin in roots, stems, and leaves of Plumbago europaea L. plant.

Spectrophotometric Determination of Trace Amounts of Mercury with 3-(2-Thiazolylazo)-2, 6-Diaminopyridine and Gelatine

Tue, 2015-05-12 12:56 — Mohammed A. A. Hannoun

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 19, Issue 8, 1986

Year of Publication:

1986

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387018608069298

Authors:

Bassem F. Shraydeh

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Ali Z. Abu Zuhri

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammad A. Hannoun

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A sensitive method for the determination of trace amounts of mercury by complexation with 3-(2-Thiazolylazo)-2, 6-diaminopyridine (2, 6-TADAP) is described. Hg(II) forms a 1:2 complex with the reagent. Beer's law is obeyed over the range 5-40 μg in the total volume of 10 ml. The molar absorptivity was found to be 1.4 times104 L mol-1 cm-1. This method is simple, rapid and involves no extraction steps whereby the use of gelatine as a solubilizing agent is described.

Simultaneous Spectrophotometric Determination of Iron(II) and Iron(III) in Mixtures Using Di-2-pyridyl Ketone Benzoylhydrazone

Mon, 2014-04-14 13:33 — Ahmad A. Abu-Obaid

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 22, Issue 9

Year of Publication:

1989

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387018908054017#.UzAdBPmSwgY

Authors:

Ahmad A. Abu-Obaid

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Foad M. Mahmoud

Mohammad A. Al-Nuri

Ali Z. Abu- Zuhri

Nidal A. Zatar

Preferred Abstract (Original):

A method for simultaneous spectrophotometric determination of total iron, iron(II) and iron(III) in mixtures containing other metal ions has been described. The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution. Iron(II) complex with DPKBH exhibits two absorption maxima at 360 and 650 nm. meanwhile iron(II1) complex with DPKBH exhibits only one maximum at 360nm. Iron(II) and iron(III) complexes with DPKBH have similar behaviour at 360nm. Iron forms 1:2 complexes with the reagent. Beer's laws are obeyed over the ranges 0.1–2 μgml-1 and 0.4–5 μgrn1-l for iron(II) complexes at 360 and 650nm respectively. Iron(III) showed results similar to those obtained for iron(II) at 360nm. The effect of pH, effect of excess reagent. the stability of complexes. and the tolerance limit of many metal ions have been reported. The method is applied to the determination of total iron, iron(I1). and iron(II1) in synthetic solutions.

Emodin, A Naturally Occuring Anthraquinone: Its Isolation and Spectrophotometric Determination in Rumex Cyprius Plant

Wed, 2014-04-02 09:51 — Dr. Waheed J. Jondi

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 29, Issue 8

Year of Publication:

1996

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019608007144

Authors:

Waheed J. Al-Jondi

Chemistry Department, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Mohammed A. Al-Nuri

Chemistry Department, An-Najah National University, Nablus, Palestine

Nidal A. Za'tar

Chemistry Department, An-Najah National University, Nablus, Palestine

Maher A. Abu-Eid

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammad A. Hannoun

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammad S. Ali-Shtayeh

Biology Department, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A new method for isolation and specrophotometric determination of emodin is presented. Emodin was isolated by thin layer chromatography (tlc) and column chromatography (cc) techniques, as an orange long crystalline substance. Emodin exhibits two absorption maxima, at 420 and 520 nm. Stability of the color and the effect of pH were studied. Beer's law is obeyed in the range 2–30 ppm.The method is applied to the determination of emodin in roots, stems, and leaves of Rumex cyprius plant.

Plumbagin, a Naturally Occurring Naphthoquinone: Its Isolation, Spectrophotometric Determination in Roots, Stems, and Leaves in Plumbago Europaea L.

Tue, 2014-04-01 12:35 — Dr. Waheed J. Jondi

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 27, Issue 4, pages 409-416

Year of Publication:

1994

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019408007247#preview

Authors:

Waheed J. Al-Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Mohammed A. Al-Nuri

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammed A. Hannoun

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Nidal A. Zatar

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Maher A. Abu-Eid

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Ahmad I. Hussein

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammed S. Ali-Shtayeh

Department of Biology and Biotechnology, Faculty of Science, An-Najah National University, Nablus. Palestine

Preferred Abstract (Original):

A new method for isolation and spectrophotometric determination of plumbagin is presented. Plumbagin was isolated by thin layer chromatography (TLC) and column chromatography (CC) techniques, as an orange tinged yellow long crystalline substances. Plumbagin exhibits two absrop-tion maxima at 410 and 510 nm. Stability of the color, pK_a value, and the effect of pH were studied. Beer's law is obeyed over the range 0.9-45 ppm. The method is applied to the determination of plumbagin in roots, stems, and leaves of Plumbago europaea L. plant.

Simultaneous Spectrophotometric Determination of Iron(II) and Iron(III) in Mixtures Using Di-2-pyridyl Ketone Benzoylhydrazone

Tue, 2014-04-01 10:21 — Mohammed Abdullah Al-Nuri

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 22, Issue 9

Year of Publication:

1989

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387018908054017#.UzlVFPmSwgY

Authors:

Mohammad A. Al-Nuri

Chemistry Department, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Nidal A. Zatar

Chemistry Department, An-Najah National University, Nablus, Palestine

Foad M. Mahmoud

Chemistry Department, An-Najah National University, Nablus, Palestine

Ahmad A. Abu-Obaid

Chemistry Department, An-Najah National University, Nablus, Palestine

Ali Z. Abu- Zuhri

Chemistry Department, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A method for simultaneous spectrophotometric determination of total iron, iron(II) and iron(III) in mixtures containing other metal ions has been described. The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution. Iron(II) complex with DPKBH exhibits two absorption maxima at 360 and 650 nm. meanwhile iron(II1) complex with DPKBH exhibits only one maximum at 360nm. Iron(II) and iron(III) complexes with DPKBH have similar behaviour at 360nm. Iron forms 1:2 complexes with the reagent. Beer's laws are obeyed over the ranges 0.1–2 μgml-1 and 0.4–5 μgrn1-l for iron(II) complexes at 360 and 650nm respectively. Iron(III) showed results similar to those obtained for iron(II) at 360nm. The effect of pH, effect of excess reagent. the stability of complexes. and the tolerance limit of many metal ions have been reported. The method is applied to the determination of total iron, iron(I1). and iron(II1) in synthetic solutions.

Plumbagin a Naturally Occurring Naphthoquinone: Its Isolation, Spectrophotometric ‎Determination in Roots, Stems, and Leaves in Plumbago Europea L

Tue, 2014-04-01 08:45 — Mohammed Abdullah Al-Nuri

Journal Title, Volume, Page:

Spectroscopy Letters, Volume 27, Issue 4, pages 409 - 416

Year of Publication:

1994

Link:

http://blogs.najah.edu/staff/nidalzatar/article/Plumbagin-a-Naturally-Occurring-...

Authors:

Mohammed A. Al-Nuri

Chemistry Department, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Maher A. Abu-Eid

Chemistry Department, An-Najah National University, Nablus, Palestine

Nidal A. Zatar

Chemistry Department, An-Najah National University, Nablus, Palestine

Waheed J. Al-Jondi

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammed A. Hannoun

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammed S. Ali-Shtayeh

Biology Department, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A new method for isolation and spectrophotometric determination of plumbagin is presented. Plumbagin was isolated by thin layer chromatography (TLC) and column chromatography (CC) techniques, as an orange tinged yellow long crystalline substances. Plumbagin exhibits two absrop-tion maxima at 410 and 510 nm. Stability of the color, pKa value, and the effect of pH were studied. Beer's law is obeyed over the range 0.9-45 ppm. The method is applied to the determination of plumbagin in roots, stems, and leaves of Plumbago europaea L. plant.

Emodin, A Naturally Occuring Anthraquinone: Its Isolation and Spectrophotometric Determination in Rumex Cyprius Plant

Tue, 2014-04-01 08:04 — Mohammed Abdullah Al-Nuri

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 29, Issue 8

Year of Publication:

1996

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019608007144

Authors:

Mohammed A. Al-Nuri

Chemistry Department, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Nidal A. Za'tar

Chemistry Department, An-Najah National University, Nablus, Palestine

Maher A. Abu-Eid

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammad A. Hannoun

Chemistry Department, An-Najah National University, Nablus, Palestine

Waheed J. Al-Jondi

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammad S. Ali-Shtayeh

Biology Department, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A new method for isolation and specrophotometric determination of emodin is presented. Emodin was isolated by thin layer chromatography (tlc) and column chromatography (cc) techniques, as an orange long crystalline substance. Emodin exhibits two absorption maxima, at 420 and 520 nm. Stability of the color and the effect of pH were studied. Beer's law is obeyed in the range 2–30 ppm.The method is applied to the determination of emodin in roots, stems, and leaves of Rumex cyprius plant.

Simultaneous Spectrophotometric Determination of Iron(II) and Iron(III) in Mixtures Using Di-2-pyridyl Ketone Benzoylhydrazone

Mon, 2014-03-31 13:28 — Nidal Zatar

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 22, Issue 9

Year of Publication:

1989

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387018908054017#.UzlVFPmSwgY

Authors:

Nidal A. Zatar

Chemistry Department, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Foad M. Mahmoud

Chemistry Department, An-Najah National University, Nablus, Palestine

Ahmad A. Abu-Obaid

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammad A. Al-Nuri

Chemistry Department, An-Najah National University, Nablus, Palestine

Ali Z. Abu- Zuhri

Chemistry Department, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A method for simultaneous spectrophotometric determination of total iron, iron(II) and iron(III) in mixtures containing other metal ions has been described. The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution. Iron(II) complex with DPKBH exhibits two absorption maxima at 360 and 650 nm. meanwhile iron(II1) complex with DPKBH exhibits only one maximum at 360nm. Iron(II) and iron(III) complexes with DPKBH have similar behaviour at 360nm. Iron forms 1:2 complexes with the reagent. Beer's laws are obeyed over the ranges 0.1–2 μgml-1 and 0.4–5 μgrn1-l for iron(II) complexes at 360 and 650nm respectively. Iron(III) showed results similar to those obtained for iron(II) at 360nm. The effect of pH, effect of excess reagent. the stability of complexes. and the tolerance limit of many metal ions have been reported. The method is applied to the determination of total iron, iron(I1). and iron(II1) in synthetic solutions.