scholarly journals Microscopical Characterization and Physicochemical Standardization of Leaves, Stems and Roots of Spondias mombin L. (Anacardiaceae)

2021 ◽  
Vol 17 (1) ◽  
pp. 15-25
Author(s):  
A.A. Adeniran ◽  
E.C. Ntamanwuna ◽  
V.O. Bassey
Keyword(s):  
Physicochemical Parameters ◽  
Physical Method ◽  
Glandular Trichome ◽  
Stem Bark ◽  
Correct Identification ◽  
Tissue Preparation ◽  
Abaxial Epidermis ◽  
Thin Sections ◽  
Spondias Mombin ◽  
Epidermal Tissue

Background: Spondias mombin L. belongs to the family Anacardiaceae. Despite its wide ethnomedicinal applications in the management of diverse diseases, there is a paucity of documented reports on its standardization.Objectives: The present study evaluated microscopical characters and some physicochemical properties of different parts of the plant for its identification and standardization.Material and Methods: Epidermal tissue preparation of the leaf of Spondias mombin (SM) was obtained using physical method while thin sections (10-12 μm) of the stem bark and root were obtained using a rotary microtome. Physicochemical parameters were determined for the powdered samples of SM using standard methods.Results: Diagnostic characters from the epidermal tissue of the leaf revealed anomocytic, paracytic stomatal type, non-glandular trichome, smooth to slightly wavy anticlinal walls while sections of the stem bark and root were characterized with abundant sclereids and calcium oxalate crystals. The stomatal number and stomatal index of the abaxial epidermis were 23.70±0.86 and 24.62±0.78 %, respectively. Ethanol had the highest extractive value (17.84±0.50) % in the leaf whereas it was lowest in petroleum ether (1.92±0.08) %. The leaf had the lowest ash value (7.13±0.76) %.Conclusion: The microscopical characterization and some of the physicochemical parameters reported herein could be useful in the compilation of monograph for the correct identification of Spondias mombin, thus contributing to the knowledge of its collection and preservation.

Yolk transport in the ovarian follicle of the hen (Gallus domesticus): lipoprotein-like particles at the periphery of the oocyte in the rapid growth phase

1979 ◽  
Vol 39 (1) ◽  
pp. 257-272 ◽  
Author(s):  
M.M. Perry ◽  
A.B. Gilbert
Keyword(s):  
Basal Lamina ◽  
Granulosa Cells ◽  
Plasma Membranes ◽  
Ovarian Follicle ◽  
Cell Loss ◽  
Coated Vesicles ◽  
Morphological Alteration ◽  
Tissue Preparation ◽  
Very Low Density Lipoproteins ◽  
Thin Sections

Thin sections of the oocyte periphery and surrounding granulosa layer from 1–5 day preovulatory follicles were examined by transmission electron microscopy. With the use of certain procedures in tissue preparation, notably the tannic acid method, numerous particles in the range of 15–40 nm with a mean diameter of 27 nm were observed in both extra- and intracellularly. The particles were abundant in the granulosa basal lamina, in the spaces between the granulosa cells and in the perivitelline space. They appeared to adhere to the oolemma as a continuous double layer which was also observed to line the coated vesicles, 200–350 nm in diameter, invaginating from the oolemma. The layer of particles was not found on the plasma membranes of the granulosa cells, nor were particles present within the cells. In the peripheral cytoplasm of the oocyte the yolk spheres, ranging upwards from 250 nm diameter, were membrane-bound and contained tightly packed particles similar to those on the oolemma. Bodies displaying features intermediate between coated vesicles and yolk spheres suggested that, on entry into the cell, loss of the cytoplasmic coat and obliteration of the vesicular lumen gave rise to nascent yolk spheres which then fused together to form the larger spheres. The extracellular layer, coated vesicles and smaller yolk spheres were absent in oocytes fixed after a 10-min delay. The evidence indicated that 27-nm particles were transferred from the basal lamina to the oocyte surface via the intergranulosa cell channels, incorporated into the cell by adsorptive endocytosis and then transferred to the yolk spheres with little morphological alteration. The identity of the particles with very low density lipoproteins, the major components of the yolk solids, was discussed.

scholarly journals Immunoelectron microscopic localization of sarcoplasmic reticulum proteins in cryofixed, freeze-dried, and low temperature-embedded tissue.

1987 ◽  
Vol 35 (7) ◽  
pp. 723-732 ◽  
Author(s):  
A O Jorgensen ◽  
L J McGuffee
Keyword(s):  
Sarcoplasmic Reticulum ◽  
Freeze Drying ◽  
Tissue Preparation ◽  
Variable Degree ◽  
Chemical Fixation ◽  
Thin Sections ◽  
Microscopic Localization ◽  
Freeze Dried ◽  
Quick Freezing ◽  
Lowicryl K4m

Immunoelectron microscopic labeling of calsequestrin on ultra-thin sections of rat ventricular muscle prepared by quick-freezing, freeze-drying, and direct embedding in Lowicryl K4M was compared to that observed on ultra-thin sections prepared by chemical fixation, dehydration in ethanol, and embedding in Lowicryl K4M. Brightfield electron microscopic imaging of cryofixed, freeze-dried, osmicated, and Spurr-embedded rat ventricular tissue showed that the sarcoplasmic reticulum was very well preserved by cryofixation and freeze-drying. Therefore, the four structurally distinct regions of the sarcoplasmic reticulum (i.e., the network SR, the junctional SR, the corbular SR, and the cisternal SR) were easily identified even when myofibrils were less than optimally preserved. As previously shown by immunoelectron microscopic labeling of ultra-thin frozen sections of chemically fixed tissue, calsequestrin was confined to the lumen of the junctional SR and of a specialized non-junctional (corbular) SR, and was absent from the lumen of network SR in cryofixed, freeze-dried, Lowicryl-embedded myocardial tissue. In addition, a considerable amount of calsequestrin was also present in the lumen of a different specialized region of the non-junctional SR, called the cisternal sarcoplasmic reticulum. By contrast, relocation of calsequestrin to the lumen of the network SR was observed to a variable degree in chemically fixed, ethanol-dehydrated, and Lowicryl-embedded tissue. We conclude that tissue preparation by cryofixation, freeze-drying, and direct embedding in Lowicryl K4M for immunoelectron microscopic localization of diffusible proteins, such as calsequestrin, is far superior to that obtained by chemical fixation, ethanol dehydration, and embedding in Lowicryl K4M.

scholarly journals Pharmacognostic standardization of Aralia cachemirica: a comparative study

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Neelofar Majid ◽  
Saduf Nissar ◽  
Weekar Younus Raja ◽  
Irshad A. Nawchoo ◽  
Zulfikar Ali Bhat
Keyword(s):  
Quality Control ◽  
Medicinal Plant ◽  
Physicochemical Parameters ◽  
Fluorescence Analysis ◽  
Correct Identification ◽  
Kashmir Himalaya ◽  
Future Studies ◽  
Diagnostic Characteristics ◽  
Important Medicinal Plant ◽  
Different Parts

Abstract Background Aralia cachemirica Decne. is an endemic and an important medicinal plant species of Kashmir Himalaya. Despite having immense medicinal importance, little information is available on the standardization parameters of the species. For this reason, present work was carried out for providing comprehensive report on the quality control and standardization parameters of A. cachemirica. In this connection, different parts (leaves, stem, and root) of the plant were examined. Methods like microscopy and macroscopy, physicochemical parameters, extractive values, and fluorescence analysis were used to establish pharmacognostical standards. Results The macroscopic, microscopy, and physicochemical parameters of different parts of A. cachemirica revealed various diagnostic characteristics in the species. Conclusion This is the first study providing complete pharmacognostic profile of A. cachemirica and hence will be useful for correct identification and authentication of the species for future studies.

scholarly journals Standardisation of Holarrhena floribunda (G. Don) Durand & Schinz: pharmacognostic evaluation and HPLC profiling of some of its steroidal alkaloids as chemical markers

2020 ◽  
Vol 11 (SPL4) ◽  
pp. 2710-2725
Author(s):  
Amponsah Kingsley I ◽  
Ampofo Kwesi E ◽  
Oppong Bekoe S ◽  
Harley Kingsley B ◽  
Armah Ackah F ◽  
...  
Keyword(s):  
Quality Evaluation ◽  
Stem Bark ◽  
Hplc Method ◽  
World Health ◽  
Correct Identification ◽  
Chemical Markers ◽  
Abaxial Surface ◽  
Steroidal Alkaloids ◽  
Anomocytic Stomata ◽  
Health Organization

The World Health Organization has encouraged the development of medicinal plant monographs in various countries. The present study therefore aimed at developing pharmacognostic standards for the quality evaluation of Holarrhena floribunda (G. Don) Durand & Schinz, used as anti-infective in folklore medicine. The macromorphological and micromorphological features, physicochemical, phytochemical and thin layer chromatograms of the leaves and stem bark were evaluated using standard methods. An HPLC method was also developed and validated to profile some steroidal alkaloids of the stem bark. The plant has simple, glaborous leaves, broadly lanceolate to ovate in shape and opposite in arrangement. The leaves were hypostomatic with paracytic and anomocytic stomata on the abaxial surface. The flat stem bark is light brown on the inner surface. Three alkaloids were profiled as chemical markers for the quality control of the stem bark of H. floribunda, to aid its correct identification for research and industry.

Standardization and Phytochemical screening of Carica papaya seeds

2021 ◽  
pp. 4540-4546
Author(s):  
Varsha Singh ◽  
Aleza Rizvi ◽  
Udaivir Singh Sara
Keyword(s):  
Physicochemical Parameters ◽  
Plant Secondary Metabolites ◽  
Chemical Properties ◽  
Fluorescence Analysis ◽  
Water Soluble ◽  
Correct Identification ◽  
Phytochemical Screening ◽  
Physico Chemical ◽  
Hexane Extracts ◽  
Phytochemical Studies

The present work focus to evaluate the physicochemical and preliminary phytochemical studies on the seeds of family Caricaceae. The plants resources which are used in pharmaceutical formulation standardization was carried out on the basis of organoleptic properties, physical characteristics, and physico-chemical properties. Different Physicochemical parameters ash values, extractive values, loss on drying, foreign matter, fluorescence analysis, and pH were evaluated. Macroscopical characteristics and Physicochemical parameters like total ash, acid insoluble ash and water soluble ash were found to be 83.7%, 71.7% and 61.5% w/w respectively. Hexane, ethyl acetate, ethanol and water soluble extractive values (hot)were 7.6%, 11.6%, 27.4%, 37.5%w/w respectively. The pH of 1% and 10% aqueous solution was found to be 3.57 and 3.78 respectively. Preliminary phytochemical screening showed the presence of Tannins, Proteins and amino acids, Glycosides, Phenolic compounds, Carbohydrates, Saponins, Alkaloids and Flavonoids. Thin layer chromatographic studies also had been done on ethanolic and hexane extracts. HPTLC fingerprinting is a valuable method for the quantitative determination of phytochemicals present in plant extract. These studies aim to investigating referential information for correct identification and standardization of this plant secondary metabolites.

scholarly journals Formation of multilamellar vesicles by addition of tannic acid to phosphatidylcholine-containing small unilamellar vesicles.

1989 ◽  
Vol 37 (11) ◽  
pp. 1635-1643 ◽  
Author(s):  
A H Schrijvers ◽  
P M Frederik ◽  
M C Stuart ◽  
K N Burger ◽  
V V Heijnen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Tannic Acid ◽  
Freeze Fracture ◽  
Tissue Preparation ◽  
Unilamellar Vesicles ◽  
Thin Sections ◽  
Multilamellar Vesicles ◽  
Morphological Studies ◽  
Rat Hearts ◽  
Small Unilamellar Vesicles

Tannic acid induces aggregation and formation of multilamellar vesicles when added to preparations of small unilamellar vesicles, specifically those containing phosphatidylcholine. Aggregation and clustering of vesicles was demonstrated by cryo-electron microscopy of thin films and by freeze-fracture technique. Turbidity measurements revealed an approximately one-to-one molar ratio between tannic acid and phosphatidylcholine necessary for a fast and massive aggregation of the small unilamellar vesicles. When tannic acid-induced aggregates were dehydrated and embedded for conventional thin-section electron microscopy, multilamellar vesicles were retrieved in thin sections. It is concluded from morphological studies, as well as previous tracer studies, that tannic acid, at least to a great extent, prevents the extraction of phosphatidylcholine. Multilamellar vesicles were also observed in tannic acid-treated vesicles prepared from total lipid extracts from either rabbit or rat hearts. Substantially more multilamellar vesicles were retrieved in the rabbit vesicle preparation. This difference can probably be explained by the difference in the proportion of the plasmalogen phosphatidylcholine, and possibly the content of sphingomyelin, in lipid extracts of rabbit and rat hearts. It is concluded that the dual effect (reduced extraction and aggregation) of tannic acid on phosphatidylcholines should be taken into consideration when tannic acid is used in tissue preparation.

scholarly journals A new technique for removal of amorphous phase tissue water without ice crystal damage: a preparative method for ultrastructural analysis and immunoelectron microscopy.

1986 ◽  
Vol 34 (9) ◽  
pp. 1123-1135 ◽  
Author(s):  
J G Linner ◽  
S A Livesey ◽  
D S Harrison ◽  
A L Steiner
Keyword(s):  
Amorphous Phase ◽  
High Vacuum ◽  
Ultrastructural Localization ◽  
Equilibrium Temperature ◽  
Ultra High Vacuum ◽  
Immunocytochemical Staining ◽  
Tissue Preparation ◽  
Tissue Water ◽  
Thin Sections ◽  
Copper Specimen

An apparatus has been produced that can remove amorphous phase tissue water via molecular distillation without devitrification or rehydration. This method represents a fundamental advance in tissue preparation, making possible for the first time ultrastructural localization of soluble molecular entities without the problems of alteration, re-distribution, and loss which have plagued conventional techniques. Fresh slices of rat brain, liver, or kidney, and monkey retinal tissue were cryofixed by bounce-free, metal mirror cooling on copper bars immersed in liquid nitrogen (LN2). Tissue transferred under LN2 was then placed in a precooled copper specimen block, which was subsequently lowered into a LN2-cooled stainless steel chamber. After rough pumping at 1 X 10(-3) mbar with a mechanical pump to remove LN2, the chamber was evacuated with a cryopump or turbomolecular pump to achieve a hydrocarbon-free, ultra-high vacuum of 1 X 10(-8) mbar. Equilibrium temperature in the chamber before the drying cycle was -192 degrees C. The copper specimen block was equipped with a thermocouple and a programmable feedback-controlled heating circuit. Tissue was dried by increasing the specimen block temperature 1 degree C/hr during the critical drying phase while monitoring the rate of water removal with a partial pressure analyzer. Results obtained indicate that drying is complete below the devitrification temperature of amorphous phase tissue water. Dried tissue was fixed with osmium tetroxide vapor, vacuum-embedded in a low-viscosity epoxy resin, sectioned, stained, and viewed with the electron microscope. Processed tissue exhibits excellent morphological preservation without the use of pre-fixation or cryoprotective agents. Thin sections of this tissue are excellent for immunocytochemical staining and electron microprobe analysis.

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