{"title":"Anatomical characterization and physicochemical standardization of Gongronema latifolium Benth. (Apocynaceae)","authors":"A. Adeniran, E. Adeyanju, Nneka Kingslena Okeke","doi":"10.4314/jpb.v19i1.3","DOIUrl":"https://doi.org/10.4314/jpb.v19i1.3","url":null,"abstract":"Gongronema latifolium Benth belongs to the family Apocynaceae. Generally, the leaves and stems of G. latifolium are used as medicine and spices for sauces, soups and salads in Southern Nigeria. In view of its medicinal uses, the present study aimed at documenting anatomical characters and physicochemical properties for its standardization. The leaf epidermis, transverse section of the midrib, petiole and stem were prepared using standard procedures. Physicochemical properties of the powdered plant were conducted following standard methods. The leaf epidermal layer revealed anomocytic stomata, calcium oxalate crystals (rosette), uniseriate multicellular trichome (non-glandular). The midrib has an abundantly non glandular trichome with numerous rosette crystals. The percentage extractive values for ethanol, distilled water and petroleum ether in the leaf powder were 16.71±0.53, 13.24±0.71 and 2.08±0.13%, respectively, while that of stem were 12.51±0.15, 10.90±0.53 and 1.10±0.21, respectively. The moisture content and total ash values for the leaf powder were 11.45±0.53 and 9.70±0.17%, respectively while for the stem were 11.07±0.38 and 7.50±0.05, respectively. In the light of frequent consumption and use of G. latifolium as medicine, some of the pharmacognostic standards provided herein may be useful for its proper identification and subsequent compilation in a monograph.","PeriodicalId":194477,"journal":{"name":"Journal of Pharmacy & Bioresources","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128774263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Ibekwe, Ayooluwakitan M. Mamora, Mary C. Okoye, T. Adelakun, O. Adigwe
{"title":"Physicochemical properties of teas sold in Abuja, Nigeria, and evaluation of their caffeine content using HPLC","authors":"N. Ibekwe, Ayooluwakitan M. Mamora, Mary C. Okoye, T. Adelakun, O. Adigwe","doi":"10.4314/jpb.v19i1.5","DOIUrl":"https://doi.org/10.4314/jpb.v19i1.5","url":null,"abstract":"Tea is commonly consumed in Nigeria. Caffeine, a major constituent in tea, has some beneficial pharmacological properties, but can negatively affect human health if consumed excessively. The objective of the study was to evaluate some physicochemical properties and caffeine content of teas marketed in FCT, Abuja, Nigeria. Ten commercial brands of teas (8 black teas and 2 green teas) were assessed for weight variation, moisture content and pH tests using standard methods. Extraction of caffeine was carried out and the identity determined by thin layer chromatography and melting points, respectively. High performance liquid chromatography (HPLC) method for analysis of caffeine was developed, validated, and applied to determine caffeine content in the tea brands. Results of the weight, moisture content and pH tests of the samples ranged from 2.07–2.33 g, 5.65–11.0 % and 4.9–5.5, respectively. Caffeine was isolated from all the samples and showed same Rf value (0.46) with that of the reference standard. Melting points ranged from 236.0–238.5 °C. Caffeine content ranged from 12.25–21.76 mg/g for black teas and 13.35–15.05 mg/g for green teas. The study provides information on the stability, acidity and caffeine content in some commercially available tea brands.","PeriodicalId":194477,"journal":{"name":"Journal of Pharmacy & Bioresources","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130829455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Balogun, O. S. Ojerinde, E. Afolabi, T. Alemika
{"title":"Isolation and characterization of β-sitosterol, oleanolic, 19- dehyroursolic and yarumic acids, from Plectranthus esculentus leaves and tubers","authors":"O. Balogun, O. S. Ojerinde, E. Afolabi, T. Alemika","doi":"10.4314/jpb.v19i1.6","DOIUrl":"https://doi.org/10.4314/jpb.v19i1.6","url":null,"abstract":"Plectranthus esculentus N.E.Br. (family Lamiaceae) also known as Livingstone potato (vat or rizga in Nigeria), is a dicotyledonous perennial shrub growing up to 2 m tall. While it is cultivated mainly for its edible tubers, the plant is potentially valuable as phytomedicine. Three varieties (vat-long’at, vat-riyom and vat-bebot) are well known among the Berom of Plateau State, Nigeria. The vat-bebot variety (which showed good promise in bioactivity studies) was used in this study. The leaves and tubers were extracted successively with hexane, ethyl acetate, methanol and water. Fractionation of the active ethyl acetate extracts was carried out using open column and preparative High Performance Liquid Chromatography (prep HPLC). This led to the isolation of β-sitosterol and oleanolic acid from the leaves; while 19-dehydroursolic acid and yarumic acid, as well as β-sitosterol were isolated from the tubers. Nuclear Magnetic Resonance (NMR) and Electron Impact Mass Spectroscopy (EIMS) were used to characterize isolated compounds. Comparing acquired spectral data of isolated compounds with those from literature helped to confirm the identity of the compounds. The isolation and characterisation of these compounds, from Plecthranthus esculentus, have not been hitherto reported in literature.","PeriodicalId":194477,"journal":{"name":"Journal of Pharmacy & Bioresources","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114322208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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