Browsing by Author "Islam, M. Saidul"

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ANTIFUNGAL ACTIVITY OF MIXED LIGAND TRANSITION METAL COMPLEXES OF SOME DIBASIC ACID AND HETEROCYCLIC BASES
(Daffodil International University, 2009-01-01) Hossain, Md. Belayet; Islam, M. Saidul; Hassan, Md. Nazmul; Yousuf, M.A.; Salam, M. Abdus
Mixed ligand transition metal complexes of Cu (II), Co (III), Rh (III) and Pt (IV) ions with dibasic acids viz., diphenic acid and adipic acid as primary ligands and amine bases as secondary ligands have been synthesized. Their conventional physical and chemical analyses have been done. The antifungal activities have been evaluated by Disc Diffusion method employed for antifungal assays against two pathogenic fungi. All the complexes show moderate antifungal activity. The highest inhibition of growth occurred on complex [Cu (DA)(8-HQ)] against the fungi Botryodiplodia theobromae and the lowest on complex [Rh (DA)(8-HQ)(H2 O)2] against the fungi Colletotrichum gloesparioides penz.
Determination of the Bio-Chemical Parameters and the Amount of Trace and Toxic Metals in Baby Foods, Jams, Jellies and Juices Available in Bangladesh
(University of Rajshahi, 4055) Ahmmed, Lokonuzzaman; Islam, Md. Nazrul; Islam, M. Saidul
The thesis entitled ‘Determination of the Bio-chemical Parameters and the Amount of Trace and Toxic Metals in Baby Foods, Jams, Jellies and Juices Available in Bangladesh’ deals with the estimation of bio-chemical parameters, trace and toxic metals in baby foods and some fruit products, e.g. jams, jellies and juices in the view of nutrition, dietary supplements, necessity of essential metals and the harmful effect of toxic metals for infants as well as adults. The results obtained during the course of PhD program have been compiled into five chapters as described below. Chapter One presents the importance of bio-chemical parameters, trace and essential metals and their biological activity in human life. Milk proteins represent one of the greatest contributions of milk to human nutrition. Research indicates that children may develop food allergies if solids are introduced too early. Formula and breast milk provide the perfect balance of nutrients that they need. The knowledge of nutrition in different types of fruit products especially jams, jellies and juices are very significant due to their good food values since these are made from fruit, water and sugar. Jams, jellies and juices provide more essential nutrients in significant amounts as well as some minerals. Our study was to find out some important bio-chemical parameters of baby foods, such as percentages of protein, reducing sugar, non-reducing sugar, total sugar, ash and moisture by using different biochemical methods. The amounts of some trace and toxic metals were also determined by using atomic absorption spectrophotometer (AAS). Chapter Two covers the experimental part which includes the listing of chemicals, physicochemical methods for the determination of biochemical parameters, and the estimation of trace and toxic metals by AAS. The preparation of calibration curves for metal estimation is also described in this chapter. Chapter Three describes the estimation of bio-chemical parameters, trace and toxic metals in baby powder milk and baby cereals. Protein, lactose, acidity, trace and toxic metals were measured in baby foods for comparison to the standard values or the values given in the packet/container. Fourteen samples of baby (0−6 months and 6−24 months) powder milk and ten brands of baby (6−24 months) cereal were analyzed and the result have been discussed in this chapter. Protein found in baby (0−6 months) powder milk of seven brands was in the range of 15.54−18.50%. The amount of lactose and acidity was found to be 51.02 to 62.49% and 0.66 to 1.28% respectively. The content of protein in baby (6−24 months) powder milk was observed between 17.27 and 22.98%. The content of lactose and acidity were in the range of 50.87−58.69 and 1.07−1.20% respectively. The trace (Co and Zn) and toxic (Pb, Cd, Cr, As and Ni) metals in baby (0−6 months) powder milk of different brands were estimated and the values were as follows: Co, 0.02 to 0.04 mg/kg; Zn, 16.95 to 52.86 mg/kg; Pb, 0.12 to 0.42 mg/kg; Cd, 0.01 to 0.02 mg/kg; Cr, 0.03 to 0.16 mg/kg and As, 0.26 to 0.61 mg/kg. Ni in baby (0−6 months) powder milk was found below the detectable limit. The trace and toxic metals in the baby (6−24 months) powder milk was found to be in the range of 0.38−0.47 mg/kg, 5.40−42.00 mg/kg, 0.01−0.04 mg/kg, 3.58−4.67 mg/kg, 0.12−0.24 mg/kg and 0.65−9.20 mg/kg for Co, Zn, Cd, Cr, As and Ni respectively. The metal contents in the baby cereals were observed as follows: Co, 1.2−8.2 mg/kg; Zn, 28.2−659.0 mg/kg; Pb, 0.3−20.4 mg/kg; Cd, 0.04−0.59 mg/kg; Cr, 0.15−0.93 mg/kg; As, 0.58−1.68 mg/kg and Ni, 0.2−32.7 mg/ kg. The bio-chemical parameters of baby powder milks were found to be consistent with their expected values. The concentration of trace metals (Co and Zn) and toxic metals (Pb, Cd, Cr, As and Ni) in baby powder milks were either significantly lower than their tolerance limits, or below their detection limits. These milks can, therefore, be considered as fairly safe for infant health. But the higher concentration of toxic metals in some baby cereal shows alarming signal to their consumer and demands proper investigation of baby cereals after the import. However, the present investigation shows that the baby powder milk which are coming to the markets from abroad contain very negligible amount of harmful metals. Chapter Four deals with the estimation of bio-chemical parameters, trace, toxic and essential metals in jams, jellies and juices available in the market of Bangladesh. The contents of protein, moisture, total solid, reducing sugar and ash were measured in jams, jellies and juices for comparison to the standard values or values given in the packet/container. Total twenty seven samples of jams (nine), jellies (eight) and juices (ten) were analyzed and discussed here……
Studies on the Transition Metal Complexes of Acids and Imides with Amine Bases
(University of Rajshahi, 2010) Rahman, Md. Mahabubar; Islam, M. Saidul
This thesis is presented on the interaction of metal ions with stoichiometric amounts of organic ligands containing O and N donors of which metal complexes have been widely used in biological and catalytical point of view. The thesis is divided into ten chapters. 1. First one is an introductory chapter. The chapter is designed to provide sufficient background and usefulness of the present study. 2. The second chapter describes the experimental techniques which include the physical measurement and analytical techniques. 3. Third chapter has been devoted to the preparation and characterization of mixed ligands complexes of Zr (VI) ions with oxalic acid and hetero cyclic amines. The general formula of the complexes are as follows; [Zr (IV) (oxa)2 L2]. Where oxa = oxalic acid L = Q, 2-Apy, 8-HQ, a-Pie, 2,2'-Bipy. The complexes were prepared in the solid form and characterized by elemental analysis, conductivity, magnetic measurements, infrared, and electronic spectroscopic studies. The infrared spectra of the complexes confirmed the co-ordination of metal ion with ligands. The presence of water molecule inside the coordination sphere was also confirmed by infrared spectra. Electronic spectra and magnetic measurement confirmed that the Zr (IV) complexes were of octahedral structure……………………..
Studies on the Transition Metal Complexes of Schiff Bases with Heterocyclic Amines
(University of Rajshahi, 2014) Banu, Laila Arjuman; Islam, M. Saidul; Miah, M. Abdul Jalil
With an aim to prepare some model complexes, six ligands were prepared. They are arranged in three series depending on nature of the ligands and their donating capability. A variety of aldehydes and a verity of primary amines were used to prepare different Schiff base ligands. The thesis also extended to synthesis and characterization of some transition metal complexes containing Schiff base as primary ligands and hetero-cyclic amines as secondary ligands. The complexes were isolated in solid form and characterized on the basis or elemental analysis, conductivity, magnetic measurements, UV, IR and NMR spectral analysis and crystallographic analysis also. The Schiff base complexes were screened for biological activities such as antibacterial, anti fungal, cytotoxicity and antioxidant properties. For description, we have divided the whole thesis into three sections viz. section A, B, & C. SECTION-A This section contains two chapters (chapter I-Il) ClfAPTER-1 This is an introductory chapter. This chapter is designed to provide sufficient background and usefulness of the present study. CHAPTER-II This chapter describes the experimental techniques, which include the chemicals, physical measurements, and analytical techniques. SECTTON-B This chapter contains four chapters (chapter III-VJ) Dharmaraj an et. al. 109 have reported the synthesis and evaluation of various diclofenac acid hydra zones and amides for invitro and in vivo antimicrobial activities against Micro Bacterium tuberculosis. Schiff base Tetrazamacrocyclic ligand and its complexes of the types, [MLX2] and [CuL]X2 [M= Co (II), Ni (II), Zn (II); X= er, N03-/ synthesized and characterized by elemental analyses, mass, H-N MR, IR, U V-Viss, magnetic susceptibility and molar conductance data. The complexes shown antimicrobial activity against various pathogens. 110-111 Lei et. al. 112-113 have reported the synthesis of a series of Schiff bases (Fig. 4) by reacting 5-Chlorosalicyldehyde and primary amines. The compounds were assayed for antibacterial and anti fungal activities. It is also reported that salicylaldehyde derivatives, with one or more halo-atoms in the aromatic ring, showed variety of biological activities.
The Formation Constant of Dimer of Acetic Acid in Different Solvents.
(University of Rajshahi, 1980) Islam, M. Saidul; Rahim, Mr. Zillur
Much of science of chemistry le concerned wt th making and breaking of chemical bonds. Pauling1 bu defined chemical bond as follows: "There is a chGlllical bond between two atoms or groups ot atom in case that the forces acting between the• aa such as to lead to the formation of aggregate with sufficient atability to make it convenient for the chemist to consider it aa an independent molecular The uord •stability• means the •strength of cheaical bond• which is given by bond energies expressed in Kcal/110le. At room temperature• the average translational energy in the direction ot one coordinate la i RT or .3 Kcal/mole .