@article {412, title = {Quantification of Quercetin Obtained from Allium cepa Lam. Leaves and its Effects on Streptozotocin-induced Diabetic Neuropathy}, journal = {Pharmacognosy Research}, volume = {9}, year = {2017}, month = {July 2017}, pages = {287-293}, type = {Original Article}, chapter = {287}, abstract = {

Objective: Antioxidant potential has protective effects in diabetic neuropathy (DN); hence, the present study was designed with an objective to quantify quercetin from shade-dried leaves of Allium cepa Lam. and to study its effects on streptozotocin (STZ)-induced chronic DN. Materials and Methods: The shade-dried leaves of A. cepa Lam. were extracted with methanol and then fractionated using ethyl acetate (ACEA). The quantification of quercetin in ACEA was evaluated by high-performance thin layer chromatography (HPTLC). The STZ (40 mg/kg) was administered to Sprague-Dawley rats (180{\textendash}250 g) maintained at normal housing conditions. The STZ was administered once a day for 3 consecutive days. The elevation in blood glucose was monitored for 3 weeks periodically using flavin adenine dinucleotide-glucose dehydrogenase method by Contour TS glucometer. Rats showing blood glucose above 250 mg/dl were selected for the study. Animals were divided into eight groups. ACEA (25, 50, and 100 mg/kg), quercetin (40 mg/kg), metformin (120 mg/kg), and gabapentin (100 mg/kg) were given orally once a day for 2 weeks. The blood glucose level was again measured at the end of treatment to assess DN. Thermal hyperalgesia, cold allodynia, motor incoordination, and neurotoxicity were studied initially and at the end of 2-week treatment. Biochemical parameters were also evaluated after 2-week drug treatment. Results: The quercetin present in ACEA was 4.82\% by HPTLC. All the ACEA treatment reduces blood glucose level at the end of the 2-week study and shows a significant neuroprotective effect in STZ-induced DN in the above experimental models. Conclusion: The quercetin present in ACEA proved protective effect in STZ-induced DN.

}, keywords = {Allium cepa, Diabetic neuropathy, High-performance thin layer chromatography, Streptozotocin}, doi = {10.4103/pr.pr_147_16}, author = {Khan Dureshahwar and Mohammed Mubashir and Hemant Devidas Une} } @article {385, title = {Quantification of Quercetin and Rutin from Benincasa hispida Seeds and Carissa Congesta Roots by High-performance Thin Layer Chromatography and High-performance Liquid Chromatography}, journal = {Pharmacognosy Research}, volume = {8}, year = {2016}, month = {December 2015}, pages = {37-42}, type = {Original Article}, chapter = {37}, abstract = {

Objective: In Indian Ayurvedic system, Benincasa hispida (BH) and Carissa congesta (CC) are well-known plants used for major and minor ailments. BH has been regarded as Kushmanda, whereas CC has been used in immune-related disorders of the human system. Quercetin and rutin identified from the vast plethora of plant extracts have proved to possess ethnopharmacological relevance. Materials and Methods: In present studies, we have determined quercetin and rutin in terms of percentage in BH seeds and CC roots by high-performance thin layer chromatography (HPTLC) and high-performance liquid chromatography (HPLC). After extraction and phytochemical screening, the extracts were subjected to quantification for the presence of quercetin and rutin by HPTLC and HPLC. Results: HPTLC showed quercetin as 44.60, 27.13\% and rutin as 32.00, 36.31\% w/w, whereas HPLC revealed quercetin as 34.00, 35.00\% and rutin as 21.99, 45.03\% w/v in BH and CC extracts, respectively. Conclusion: The BH and CC extracts have elucidated peaks that were corresponding with standard peaks on undertaking chromatographic studies.

}, keywords = {Benincasa hispida, Carissa congesta, High-performance liquid chromatography, high-performance thin layer chromatography, Quercetin, Rutin}, doi = {10.4103/0974-8490.171098}, author = {Gaurav Mahesh Doshi and Hemant Devidas Une} } @article {778, title = {Solicitation of HPLC and HPTLC Techniques for Determination of Rutin from Polyalthia longifolia Thwaites}, journal = {Pharmacognosy Research}, volume = {6}, year = {2014}, month = {May,2014}, pages = {234-239}, type = {Original Article}, chapter = {234}, abstract = {

Background: Polyalthia longifolia Thwaites is an important traditional plant in India. Rutin, an active constituent has been reported to possess good amount of pharmacological as well as therapeutic potential. Objective: The aim of the present study was to find out by analytical techniques how much percentage of rutin is present in the plant leaves{\textquoteright} ethanolic extract by analytical techniques. Materials and Methods: Shade dried leaves of Polyalthia longifolia were subjected to cold ethanolic extraction followed by monitoring the isolated rutin high-pressure liquid chromatography (HPLC) and high performance thin layer chromatography (HPTLC) after carrying out preliminary phytochemical screening. Results: Extraction yield was found to be 13.94\% w/w. Phytochemical screening of the extract showed the presence of flavonoids, steroids, diterpenoids, alkaloids, saponins, tannins and phenolic compounds and mucilage. From the Rf value, the ethanolic extract was found to be having constituent identical to rutin. By HPTLC and HPLC the amount of rutin was found to be 11.60\% w/w and 4.03\% w/v, respectively. Conclusion: The active constituent isolated was found to be equal to rutin.

}, keywords = {High performance thin layer chromatography, High-pressure liquid chromatography, Polyalthia longifolia, Rutin, Thin layer chromatography}, doi = {10.4103/0974-8490.132601}, author = {Gaurav Mahesh Doshi and Sandeep Prabhakar Zine and Pratip Kashinath Chaskar and Hemant Devidas Une} }