ISHAN KHAN - Academia.edu (original) (raw)

Papers by ISHAN KHAN

Journal of Pharmacognosy and Phytochemistry, 2017

Coriander and mustard floral honey samples collected form Rajasthan State of India were analyses ... more Coriander and mustard floral honey samples collected form Rajasthan State of India were analyses for 27 organochlorine and organophosphorus pesticides residues. An analytical procedure based on QuEChERS extraction with acetonitrile followed by gas chromatography-mass spectrometry was used and samples were analysed on GC MS/MS Triple quadrupole System (Shimadzu TQ 8037). The calibration curves constructed were linear over the range from 0.005-0.025 μg ml-1. The correlation coefficient was ≥ 0.995 for all pesticides standard. The mean recoveries for extractions were 65115% for lower concentration range (0.005 mg kg-1) and 70-120% for the higher concentration range (0.10 mg kg-1) for pesticides analysed. Three different pesticide, Dimethoate, Methyl parathion (organophosphate pesticides) and alphaEndosulfan (organochlorine pesticides) were detected more than 0.001 mg kg-1 in coriander floral honey samples while in mustard floral honey samples Methyl parathion Famphur (organophosphate p...

The aroma of cumin (Cuminum cyminum L.) is due to the presence of aromatic volatile compounds. Th... more The aroma of cumin (Cuminum cyminum L.) is due to the presence of aromatic volatile compounds. The flavor of cumin is judged by its volatile oil content. Effect of irrigation based on IW/CPE ratio and drip fertigation on Essential oil chemical constituents and medicinal compounds of Cumin (Cuminum cyminum) were analyzed at Agricultural Research Station, Mandor, Jodhpur. The total phenolic content was ranged from 444.97 mg to 531.90 mg GAE 100 g-1 seed while total flavonoid content was ranged from 112.22 mg to 203.12 mg QE 100 g-1 seed. Highest total phenolic and flavonoid content was observed in drip fertigation at 0.8 IW/CPE ratio with 100% RDF. 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging antioxidant activity expressed as IC50 values ranged from 0.38-0.47 mg ml-1. Lower IC50 value was observed in treatment with drip fertigation as compare to surface irrigation. Study results reveal that drip fertigation enhances the amount of secondary metabolites and antioxidant activ...

Honey has a long history of human consumption, and is used in various foods and beverages as a sw... more Honey has a long history of human consumption, and is used in various foods and beverages as a sweetener and flavoring. It also has a role in reli gion and symbolism. Flavors of honey vary based on the nectar source, and various types and grades of hone y are available. It is also used in various medicin al traditions to treat ailments. The health effects of honey have long been noted by humans. The nutritio nal and medicinal qualities of honey have been document ed in Vedic, Greek, Roman, Christian, Islamic and other texts. Physicians of ancient times, such as A ristotle (384‐322 BC), Aristoxenus (320 BC) Hippocrates, Porphyry, Cornelius Celsus (early firs t century AD) and Dioscorides (c. 50 AD), and Arab physicians have referred to the healing qualities o f honey. Honey contains powerful antioxidants with antiseptic and antibacterial properties.

High frequency organogenesis was achieved in anise (Pimpinella anisum L.) using hypocotyl explant... more High frequency organogenesis was achieved in anise (Pimpinella anisum L.) using hypocotyl explants from in vitro germinated seedlings. Both cytokinins, benzylaminopurine and kinetin induced shoot regeneration but the effect of benzylaminopurine was more pronounced. High frequency shoot regeneration (45 shoots explant-1) was obtained on benzylaminopurine 1 mg l-1. Both cytokinins were also tested in combination with auxins (naphthaleneacetic acid/indoleacetic acid). Interaction of benzylaminopurine/kinetin with naphthaleneacetic acid/indoleacetic acid increased the length of regenerated shoots. Different kinds of callus morphology was observed but it had no relationship with regeneration potential. The regenerated plants were normal and healthy.

International journal of innovative research and development, 2016

Electric Discharge Drilling (EDD) is effectively used in modern manufacturing industries it is a ... more Electric Discharge Drilling (EDD) is effectively used in modern manufacturing industries it is a thermo-electric non-traditional machining process. It has the potential to machine electrically non-conductive high-strength, high-temperature-resistant (HSHTR) ceramics. This paper investigates the influence of four different input parameters such as Pulse on time, Pulse off time, Distilled water pressure and Discharge current of electric discharge drilling performance of hole circularity, hole taper and hole dilation using Taguchi methodology. Titanium and its alloys have high demand in different industries due to their superior properties. Brass electrode was selected based on their electrical and thermal property. Experiments were carried out as per Taguchi’s L36 orthogonal array. Analysis of variance indicates that the pulse on time is more significant factor for hole circularity, distilled water pressure is more significant for hole taper and Pulse off time is more significant fact...

Since their discovery, immense attention has been given to carbon nanotubes (CNTs), due to their ... more Since their discovery, immense attention has been given to carbon nanotubes (CNTs), due to their exceptional thermal, electronic and mechanical properties and, therefore, the wide range of applications in which they are, or can be potentially, employed. Hence, it is important that all the properties of carbon nanotubes are studied extensively. This thesis studies the vibrational frequencies of double-walled and triple-walled CNTs, with and without an elastic medium surrounding them, by using Finite Element Method (FEM) and Dynamic Stiffness Matrix (DSM) formulations, considering them as Euler-Bernoulli beams coupled with van der Waals interaction forces. For FEM modelling, the linear eigenvalue problem is obtained using Galerkin weighted residual approach. The natural frequencies and mode shapes are derived from eigenvalues and eigenvectors, respectively. For DSM formulation of double-walled CNTs, a nonlinear eigenvalue problem is obtained by enforcing displacement and load end cond...

International Biomechanics

Research Journal of Humanities and Social Sciences

Indonesian Journal of Chemistry

The physicochemical, total phenolics, flavonoids, and antioxidant activity were evaluated for bio... more The physicochemical, total phenolics, flavonoids, and antioxidant activity were evaluated for biochemical characterization of coriander and mustard floral honey. The total phenolics, flavonoids and antioxidant activity were analyzed using UV-VIS spectrophotometer. Fourier transform infrared spectroscopy (FT-IR) was used to evaluate the chemical characteristic of coriander and mustard floral honey. The total phenolics content was ranged from 294 to 462 mg gallic acid equivalent kg-1 of honey. The total flavonoid content was ranged from 43 to 53 mg quercetin equivalent kg-1 of honey. Antioxidant activity results were expressed as inhibitory concentration (IC50) value ranged from 4.58 to 5.54 mg mL-1. FT-IR spectra showed the presence of alcohols, carboxylic acids, esters, ethers, phenols, and amines in both floral honey samples. This study discovered that coriander floral honey is more affluent than mustard floral honey in nutritional as well as medicinal aspects. At a glance the proc...

The aroma of cumin (Cuminum cyminum L) is due to the presence of aromatic volatile compounds. The... more The aroma of cumin (Cuminum cyminum L) is due to the presence of aromatic volatile compounds. The flavor of cumin is judged by its volatile oil content. Cumin seeds of variety RZ-209 and GC- 4 collected from western Rajasthan were used for screening of essential oil chemical constituents. The volatile oil content of RZ-209 and GC-4 was 4.0 % and 4.33 % respectively. Cuminaldehyde was found as major constituents in cumin essential oil. The GC-MS scan result reveals that RZ-209 variety contains slightly more cuminaldehyde (40.31 %) than GC-4 variety (38.50 %). Other phyto-chemical constituents were terpenic compounds and organic acids. The total phenolics content ranged from 101-109 mg GAE g-1 seed while total flavonoid content were 65-67 mg QE g-1 seed. 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging antioxidant activity expressed as IC50 value was ranged from 14-16 mg/ml.

In cumin (Cuminum cyminum L.) the aroma is due to the presence of aromatic volatile compounds. Th... more In cumin (Cuminum cyminum L.) the aroma is due to the presence of aromatic volatile compounds. The flavor of cumin is judged by its volatile oil content. Cumin seeds of four varieties RZ-19, RZ-223, RZ-341 and RZ-345 collected from western Rajasthan were used for screening of essential oil chemical constituents. Essential oil was isolated by clevenger apparatus. The essential oil content in RZ-19, RZ-223, RZ-341 and RZ-345 was found 1.66%, 2.33%, 3.66% and 3% respectively. Cuminaldehyde was identified as major constituents in cumin essential oil. The GC-MS scan result reveals that RZ-223 variety contains highest Cuminaldehyde (40.88%) followed by RZ-345 (40.69%), Rz-19 (32.59%) and RZ-341 (31.65%). Other phyto-chemical constituents were terpenic compounds, alcohol and aldehydes.

Pearl millet (Pennisetum glaucum) is an important food staples in semi-arid tropics of Asia and A... more Pearl millet (Pennisetum glaucum) is an important food staples in semi-arid tropics of Asia and Africa. Millet is cereal grains that have prospective to be used as substitute to wheat flour for celiac patients. It is considered as the good source of many important and essential fatty acids. The present study was an effort to explore biochemical composition of five millet varieties with special reference to their volatile profiling. Pearl millet seeds of HHB-67, RHB-177, RHB-173, GHB-558 and GHB-538 were used for identification of volatile compounds in methanolic extract. The GC-MS scan analysis results reveal that linoleic acid was found as major constituents prominently in methanol extract of pearl millet seed. Out of five genotypes RHB-173 contains highest linoleic acid content in methanol extract.

International Journal of Pharma and Bio Sciences, 2047

Honey has been used by humanity for millions of years for nutrition and theraputive purposes. Hon... more Honey has been used by humanity for millions of years for nutrition and theraputive purposes. Honey is a very complex natural product, its chemical properties and composition depends not only on the nectar source, but also on other factors such as bee species, geographic area and mode of storage. Honey contains different biological properties, which includes antioxidant characteristic, phenolics. It is a solution of sugars containing secondary metabolites. Flavour and fragrance of honey varies based on the nectar source. The volatile and semi-volatile organic compounds also differ based on nectar collected by honeybees.. Gas Chromatography-Mass Spectroscopy (GC-MS) analysis of unifloral honey samples from mustard collected by Apis melifera was carried out on a Shimadzu GCMS-QP2010 Ultra system. The identification of the chemical compounds was confirmed based on the peak area, retention time and molecular formula from National Institute for Standards and Technology (NIST) mass spectral library, ver. NIST 11. Twenty four4 volatile bioactive compounds were detected. Sugar monosaccharide L-Glyceraldehyde (28.46%) was found in major quantity while other bioactive compounds were detected in trace amounts. Sugar and hydrocarbons constituted 60% of the total composition of mustard honey. Other classes of chemical compounds detected included acids, aldehydes, alcohols, ketones and furans. The terpenes and other phyto-chemical constituents which were present in mustard seed oil were not seen in mustard floral honey. The volatile profile of mustard floral honey was differed from other floral honey which could be used for characterization of mustard honey.

Perusal of the Finite Element Method, 2016

2014 International Conference on Medical Imaging, m-Health and Emerging Communication Systems (MedCom), 2014

Canadian Journal of Plant Science, 2013

Xin, H., Wu, B., Zhang, H., Wang, C., Li, J., Yang, B. and Li, S. 2013. Characterization of volat... more Xin, H., Wu, B., Zhang, H., Wang, C., Li, J., Yang, B. and Li, S. 2013. Characterization of volatile compounds in flowers from four groups of sweet osmanthus ( Osmanthus fragrans ) cultivars. Can. J. Plant Sci. 93: 923–931. Headspace-solid-phase microextraction (HS-SPME) and gas chromatography-mass spectroscopy (GC-MS) were used to characterize the volatiles in flowers of four cultivar groups of sweet osmanthus (Osmanthus fragrans Lour.), including Thunbergii, Latifolius, Aurantiacus and Semperflorens Groups. A total of 72 volatiles were identified. Volatile compounds and their relative contents varied among the four groups or cultivars within each group. Briefly, β-ionone, cis-linalool oxide (furan), trans-linalool oxide (furan) and linalool were the most common volatiles in tested cultivars, while (E)-2-hexenal, (Z)-3-hexen-1-ol and hexanal were abundant in several cultivars. Principal component analysis showed that the Aurantiacus Group was rich in cis- and trans-linalool oxide (...

Mustard (Brassica spp.), family cruciferae are the major oilseed crop grow throughout India for e... more Mustard (Brassica spp.), family cruciferae are the major oilseed crop grow throughout India for edible oil. It is an open pollinated crop and honeybees are effective pollinators for open pollinated crops because of a lot of nectar and pollens are available on the flowers of mustard. The studies were conducted during rabi 2013-14 and 2014-15 at ARS, Kota to enhance the yield of mustard through honey bee pollinator. Mustard variety “Bio-902” was grown following all recommended agronomic practices without spraying through the crop season. The colonies of honeybee (Apis mellifera) were placed in cage measuring 10X10 sq. meters before the initiation of flowering. The present study contained three pollination treatments viz., Plants caged Pollinator Exclusion (PE), Plants caged with bee hive (BP) and Plants kept open to all pollinators (OP). The comparative data pertaining to modes of pollination in mustard crop revealed that highest values of mean no. of siliqua/plant (186.44), no. of se...