Rakibul Islam - Academia.edu (original) (raw)

Papers by Rakibul Islam

Sir, As you requested to submit a term paper on Bangladesh Labor Act, 2006 perspective to increas... more Sir, As you requested to submit a term paper on Bangladesh Labor Act, 2006 perspective to increase student's awareness about effects of Trade union & industrial relations. This term paper presents the fact more critically which you authorized us. For this we collected information from Bangladesh Labor Law. The report reveals in Trade union & industrial relations with detail. In light of these findings, the report focuses on the effects of Trade unions of workers and employers, Registration, application for registration, requirements for application, and registration of trade union in civil aviation establishments, cancellation of registration, enforceability of agreement: collective bargaining agent, participation committee etc. Thanks for giving the opportunity to prepare the Trade union & industrial relations. We enjoyed and experienced after making turn paper over this interesting informative topic.

Optical pulling with tractor beams is so far highly dependent on (i) the property of embedding ba... more Optical pulling with tractor beams is so far highly dependent on (i) the property of embedding background or the particle itslef , (ii) the number of the particles and/or (iii) the manual ramping of beam phase. A necessary theoretical solution of these problems is proposed here. This article demonstrates a novel active tractor beam for multiple fully immersed objects with its additional abilities of yielding a controlled rotation and a desired 3D trapping. Continuous and stable long distance levitation, controlled rotation and 3D trapping are demonstrated with a single optical set-up by using two coaxial, or even non-coaxial, superimposed non-diffracting higher order Bessel beams of reverse helical nature and different frequencies. The superimposed beam has periodic intensity variations both along and around the beam-axis because of the difference in longitudinal wave-vectors and beam orders, respectively. The difference in frequencies of two laser beams makes the intensity pattern move along and around the beam-axis in a continuous way without manual ramping of phase, which allows for either linear motion (forward or backward) or angular movement (clockwise or anticlockwise) of fully immersed multiple particles. As a major contribution, the condition for increasing the target binding regions is also proposed to manipulate multiple immersed objects of different sizes and shapes.

Women & health, Jan 16, 2016

Despite startling developments in maternal health care services, use of these services has been d... more Despite startling developments in maternal health care services, use of these services has been disproportionately distributed among different minority groups in Bangladesh. This study aimed to explore the factors associated with the use of these services among the Mru indigenous women in Bangladesh. A total of 374 currently married Mru women were interviewed using convenience sampling from three administrative sub-districts of the Bandarban district from June to August of 2009. Associations were assessed using Chi-square tests, and a binary logistic regression model was employed to explore factors associated with the use of maternal health care services. Among the women surveyed, 30% had ever visited maternal health care services in the Mru community, a very low proportion compared with mainstream society. Multivariable logistic regression analyses revealed that place of residence, religion, school attendance, place of service provided, distance to the service center, and exposure ...

2015 IEEE International Conference on Telecommunications and Photonics (ICTP), 2015

2015 International Conference on Electrical & Electronic Engineering (ICEEE), 2015

Electromagnetic (EM) fields at a point in space generated by electric/magnetic dipole embedded in... more Electromagnetic (EM) fields at a point in space generated by electric/magnetic dipole embedded in a general anisotropic stratified media can be analytically solved [1] by decomposing the fields into transverse electric (TE) and transverse magnetic(TM) modes. The electromagnetic field strengths are dependent on the nature (electric or magnetic) of dipoles, their placement in the stratified media, and relative location of dipoles. A three-layer stratified media has been employed in this paper to model the present environment consisting of atmosphere, sea-water, and sea floor. A concise description of the mathematical model describing the EM fields along with solution technique is presented in this paper. Parametric computational investigations are also presented to delineate effects of i) multi-layer geometry, ii) the electric and magnetic properties of the media, iii) the nature and orientations of EM sources, and iv) multiplicity of isolated sources, on EM fields at a specified observation point. An interesting result of this paper is the observation that contributions from horizontal electric dipoles have comparable electric and magnetic field strengths at an observation point in the atmosphere

Menopause (New York, N.Y.), Jan 24, 2016

The aim of the study was to document the prevalence of menopausal symptoms and the extent to whic... more The aim of the study was to document the prevalence of menopausal symptoms and the extent to which women are bothered by vasomotor symptoms (VMS) and joint pain in Bangladesh. A total of 1,590 women, aged 30 to 59 years, participated in a cross-sectional, questionnaire-based study between September 2013 and March 2014. The main outcome measures were moderate to severely bothersome VMS and joint pain, measured by the Menopause-Specific Quality of Life questionnaire. Of participants, 59.4% were premenopausal, 8.4% perimenopausal, and 32.3% postmenopausal. Approximately all women reached menopause by the age of 50 years. The prevalence of moderate to severely bothersome VMS was 4.1% in premenopausal, 33.3% in perimenopausal, and 28.2% in postmenopausal women. Factors associated with moderate to severely bothersome VMS were being perimenopausal (odds ratio [OR] 46.34, 95% CI 13.29-161.56; P < 0.001) or postmenopausal (OR 19.15, 95% CI 5.63-65.11; P < 0.001) and obesity (OR 2.20, 9...

The oncologist, Jan 20, 2015

Cervical cancer (CCa) is the second most common cancer among women in Bangladesh. The uptake of C... more Cervical cancer (CCa) is the second most common cancer among women in Bangladesh. The uptake of CCa screening was less than 10% in areas where screening has been offered, so we investigated the awareness of CCa and CCa screening, and factors associated with women's preparedness to be screened. A nationally representative, cross-sectional survey of women aged 30-59 years was conducted in 7 districts of the 7 divisions in Bangladesh, using a multistage cluster sampling technique. Factors associated with the awareness of CCa and screening uptake were investigated separately, using multivariable logistic regression. On systematic questioning, 81.3% and 48.6% of the 1,590 participants, whose mean age was 42.3 (±8.0) years, had ever heard of CCa and CCa screening, respectively. Having heard of CCa was associated with living in a rural area (adjusted odds ratio [OR]: 0.42; 95% confidence interval [CI]: 0.26-0.67), being 40-49 years old (OR: 1.59; 95% CI: 1.15-2.0), having no education ...

Maturitas, 2015

To investigate the awareness of breast cancer (BCa) and BCa screening amongst women at midlife in... more To investigate the awareness of breast cancer (BCa) and BCa screening amongst women at midlife in Bangladesh. A nationally representative cross-sectional survey of women aged 30-59 years was conducted in 7 districts of the 7 divisions in Bangladesh, using a multistage cluster sampling technique. The factors associated with the awareness of BCa and breast assessment of asymptomatic women were investigated separately, using multivariable logistic regression. Of the 1590 participants, mean age 42.3 (±8.0) years, 81.9% had ever heard of BCa and 64.2% of any methods of BCa screening, respectively. Awareness of BCa was associated with being aged 40-49 years (adjusted OR 2.04, 95% CI 1.46-2.84), aged 49-59 years (1.96, 1.32-2.91), being overweight (1.46, 1.07-2.01) and obesity (1.62, 1.01-2.62), while inversely associated with rural dwelling (0.37, 0.22-0.61), primary education (0.44, 0.27-0.70), having no education (0.23, 0.14-0.36) and parity (0.62, 0.44-0.87). Of the 750 women who were aware of clinical breast examination (CBE) or mammography, reasons provided for not undergoing screening included that they had no symptoms (92%) and that they did not know screening was needed (40%). 8% of women reported CBE. Women with no education were less likely to have undergone CBE (0.38, 0.141.04; p=0.059). Lack of understanding of the assessment of asymptomatic women is the key obstacle to BCa screening uptake in Bangladesh. Health education programs, especially BCa awareness programs, have the potential to increase BCa awareness and down-staging of the disease.

Rural and remote health

Health 11: 1672. (Online) 2011 Available: http://www.rrh.org.au A B S T R A C T Introduction: Ant... more Health 11: 1672. (Online) 2011 Available: http://www.rrh.org.au A B S T R A C T Introduction: Antenatal and postnatal care services are significant interventions to improve maternal health and prevent maternal and infant deaths. However, these services are poorly developed in Bangladesh, particularly among Indigenous women. This study examined factors associated with antenatal and postnatal care visits among the Mru, the most underprivileged Indigenous people in Bangladesh. Methods: This cross-sectional study used both quantitative and qualitative methods. In total, 374 currently married Mru women with at least one child aged 5 years or younger were selected from 3 upazilas (sub-districts) of Bandarban District, Bangladesh for survey. In addition, in-depth interviews were performed with 26 Mru leaders, Mru women, traditional midwives, village 'doctors', school teachers, health and non-government organization workers. Associations between antenatal and postnatal care visits and the women's backgrounds characteristics were assessed by bivariate and multivariate analyses. Results: The traditional Mru prenatal and postnatal practices potentially inhibited women from seeking care. Both antenatal (11.2%) and postnatal (6.4%) care visits among the Mru women were lower than the national level. Most visits were to traditional midwives in their rural villages, rather than to health complexes or hospitals. The main reasons for lack of antenatal and postnatal care were travelling distance to care and transportation problems. Multivariate analysis revealed factors associated with antenatal © MR Islam, JO Odland, 2011. A licence to publish this material has been given to James Cook University, http://www.rrh.org.au 2

Optical pulling with tractor beams is so far highly dependent on (i) the property of embedding ba... more Optical pulling with tractor beams is so far highly dependent on (i) the property of embedding background or the particle itself , (ii) the number of the particles and/or (iii) the manual ramping of beam phase. A necessary theoretical solution of these problems is proposed here. This article demonstrates a novel active tractor beam for multiple fully immersed objects with its additional abilities of yielding a controlled rotation and a desired 3D trapping. Continuous and stable long distance levitation, controlled rotation and 3D trapping are demonstrated with a single optical set-up by using two coaxial, or even non-coaxial, superimposed non-diffracting higher order Bessel beams of reverse helical nature and different frequencies. The superimposed beam has periodic intensity variations both along and around the beam-axis because of the difference in longitudinal wave-vectors and beam orders, respectively. The difference in frequencies of two laser beams makes the intensity pattern ...

The study focuses on examining the stochastic process of return distribution in the Chittagong st... more The study focuses on examining the stochastic process of return distribution in the Chittagong stock exchange (CSE) to deliver persistency of weak form of efficiency and time varying risk -return association for an emerging country like Bangladesh. This study used daily series of market index (CASPI) data over the period from January 1st 2004 to September 30th 2014.The OLS, GARCH (1, 1) regression and GARCH (1, 1) with dummy variable models are employed to identify the existence of the day-of-the-week effect on stock market returns and volatility. The empirical findings attained from the models verified that the day-of-the-week effects on stock returns and volatility are persistent in the stock market. Specifically, a negative effect is observed for Sunday while a positive effect occurs on Thursday. Moreover, the highest volatility occurs on Sunday and lowest volatility found in Thursday. All statistically significant results confirm the absence of weak form of efficiency in Chittag...

Objectives: This article was aimed to examine the Contraceptive Prevalence Rate (CPR) and factors... more Objectives: This article was aimed to examine the Contraceptive Prevalence Rate (CPR) and factors that influence the current use of contraception among Mru women. Methods: The Mru is the most underprivileged indigenous community in Bangladesh since they are beyond geographical, linguistic, cultural and economic reach. In this study, 374 currently married Mru women were interviewed, selected purposively from three upazilas (administrative sub-districts) of Bandarban district, a part of the Chittagong Division and Chittagong Hill Tracts (CHT), where most of the Mru people live. Association between current use of contraceptives and the explanatory variables were first assessed in bivariate analysis using Chi-square test. A binary logistic regression model was also employed to explore the determinants of current use of contraceptives among the Mru community. Results: The CPR was much lower (25.1%) among the Mru people than the national level (55.8%). Among different modern and tradition...

Applied Physics Letters, 2015

ABSTRACT

European Journal of Medicinal Plants, 2015

IOSR Journal of Pharmacy and Biological Sciences, 2013

This study was designed to screen out free radical scavenging potentiality of 84 medicinal plants... more This study was designed to screen out free radical scavenging potentiality of 84 medicinal plants. Stock solution of different plant extracts and standard were diluted to achieve suitable concentrations. A control was also prepared without plant extract solution. Then 0.004% DPPH solution was added. The mixtures were incubated in the room temperature for 30 minutes. Then the absorbance was measured at 517 nm against solvent in UV-spectrophotometer and then IC50 was calculated. In this experiment two standard were usedascorbic acid and BHT. Both showed a significant IC50 value of 15.5µg/mL, and 46.54µg/mL respectively. Among 84 medicinal plants Syzygim cumini, Casuarina littorea, Borassus flabellifer, Enhydra fluctuans, and Minusops elengi exhibited highest radical scavenging potential with an IC50 value of 12.816µg/mL, 14.467µg/mL, 15.755µg/mL, 15.653µg/mL, and 20.380µg/mL respectively. All these value are very close to the IC50 value of ascorbic acid and better than IC50 value of BHT (Butylated Hydroxy Toluene). Syzygim cumini is the most powerful scavenger among all tested medicinal plants and also most strong scavenger than ascorbic acid and BHT. Scavenging activity was found to increase in dose dependent manner. Another 30 medicinal plants exhibited good scavenging property and 14 medicinal plants showed moderate scavenging activity. The rest presented lower scavenging activity. This present study indicates that plants having good scavenging property may have various health beneficial effects and these plants can be considered as valuable source of bioactive components with high antioxidant properties.

Sir, As you requested to submit a term paper on Bangladesh Labor Act, 2006 perspective to increas... more Sir, As you requested to submit a term paper on Bangladesh Labor Act, 2006 perspective to increase student's awareness about effects of Trade union & industrial relations. This term paper presents the fact more critically which you authorized us. For this we collected information from Bangladesh Labor Law. The report reveals in Trade union & industrial relations with detail. In light of these findings, the report focuses on the effects of Trade unions of workers and employers, Registration, application for registration, requirements for application, and registration of trade union in civil aviation establishments, cancellation of registration, enforceability of agreement: collective bargaining agent, participation committee etc. Thanks for giving the opportunity to prepare the Trade union & industrial relations. We enjoyed and experienced after making turn paper over this interesting informative topic.

Optical pulling with tractor beams is so far highly dependent on (i) the property of embedding ba... more Optical pulling with tractor beams is so far highly dependent on (i) the property of embedding background or the particle itslef , (ii) the number of the particles and/or (iii) the manual ramping of beam phase. A necessary theoretical solution of these problems is proposed here. This article demonstrates a novel active tractor beam for multiple fully immersed objects with its additional abilities of yielding a controlled rotation and a desired 3D trapping. Continuous and stable long distance levitation, controlled rotation and 3D trapping are demonstrated with a single optical set-up by using two coaxial, or even non-coaxial, superimposed non-diffracting higher order Bessel beams of reverse helical nature and different frequencies. The superimposed beam has periodic intensity variations both along and around the beam-axis because of the difference in longitudinal wave-vectors and beam orders, respectively. The difference in frequencies of two laser beams makes the intensity pattern move along and around the beam-axis in a continuous way without manual ramping of phase, which allows for either linear motion (forward or backward) or angular movement (clockwise or anticlockwise) of fully immersed multiple particles. As a major contribution, the condition for increasing the target binding regions is also proposed to manipulate multiple immersed objects of different sizes and shapes.

Women & health, Jan 16, 2016

Despite startling developments in maternal health care services, use of these services has been d... more Despite startling developments in maternal health care services, use of these services has been disproportionately distributed among different minority groups in Bangladesh. This study aimed to explore the factors associated with the use of these services among the Mru indigenous women in Bangladesh. A total of 374 currently married Mru women were interviewed using convenience sampling from three administrative sub-districts of the Bandarban district from June to August of 2009. Associations were assessed using Chi-square tests, and a binary logistic regression model was employed to explore factors associated with the use of maternal health care services. Among the women surveyed, 30% had ever visited maternal health care services in the Mru community, a very low proportion compared with mainstream society. Multivariable logistic regression analyses revealed that place of residence, religion, school attendance, place of service provided, distance to the service center, and exposure ...

2015 IEEE International Conference on Telecommunications and Photonics (ICTP), 2015

2015 International Conference on Electrical & Electronic Engineering (ICEEE), 2015

Electromagnetic (EM) fields at a point in space generated by electric/magnetic dipole embedded in... more Electromagnetic (EM) fields at a point in space generated by electric/magnetic dipole embedded in a general anisotropic stratified media can be analytically solved [1] by decomposing the fields into transverse electric (TE) and transverse magnetic(TM) modes. The electromagnetic field strengths are dependent on the nature (electric or magnetic) of dipoles, their placement in the stratified media, and relative location of dipoles. A three-layer stratified media has been employed in this paper to model the present environment consisting of atmosphere, sea-water, and sea floor. A concise description of the mathematical model describing the EM fields along with solution technique is presented in this paper. Parametric computational investigations are also presented to delineate effects of i) multi-layer geometry, ii) the electric and magnetic properties of the media, iii) the nature and orientations of EM sources, and iv) multiplicity of isolated sources, on EM fields at a specified observation point. An interesting result of this paper is the observation that contributions from horizontal electric dipoles have comparable electric and magnetic field strengths at an observation point in the atmosphere

Menopause (New York, N.Y.), Jan 24, 2016

The aim of the study was to document the prevalence of menopausal symptoms and the extent to whic... more The aim of the study was to document the prevalence of menopausal symptoms and the extent to which women are bothered by vasomotor symptoms (VMS) and joint pain in Bangladesh. A total of 1,590 women, aged 30 to 59 years, participated in a cross-sectional, questionnaire-based study between September 2013 and March 2014. The main outcome measures were moderate to severely bothersome VMS and joint pain, measured by the Menopause-Specific Quality of Life questionnaire. Of participants, 59.4% were premenopausal, 8.4% perimenopausal, and 32.3% postmenopausal. Approximately all women reached menopause by the age of 50 years. The prevalence of moderate to severely bothersome VMS was 4.1% in premenopausal, 33.3% in perimenopausal, and 28.2% in postmenopausal women. Factors associated with moderate to severely bothersome VMS were being perimenopausal (odds ratio [OR] 46.34, 95% CI 13.29-161.56; P < 0.001) or postmenopausal (OR 19.15, 95% CI 5.63-65.11; P < 0.001) and obesity (OR 2.20, 9...

The oncologist, Jan 20, 2015

Cervical cancer (CCa) is the second most common cancer among women in Bangladesh. The uptake of C... more Cervical cancer (CCa) is the second most common cancer among women in Bangladesh. The uptake of CCa screening was less than 10% in areas where screening has been offered, so we investigated the awareness of CCa and CCa screening, and factors associated with women's preparedness to be screened. A nationally representative, cross-sectional survey of women aged 30-59 years was conducted in 7 districts of the 7 divisions in Bangladesh, using a multistage cluster sampling technique. Factors associated with the awareness of CCa and screening uptake were investigated separately, using multivariable logistic regression. On systematic questioning, 81.3% and 48.6% of the 1,590 participants, whose mean age was 42.3 (±8.0) years, had ever heard of CCa and CCa screening, respectively. Having heard of CCa was associated with living in a rural area (adjusted odds ratio [OR]: 0.42; 95% confidence interval [CI]: 0.26-0.67), being 40-49 years old (OR: 1.59; 95% CI: 1.15-2.0), having no education ...

Maturitas, 2015

To investigate the awareness of breast cancer (BCa) and BCa screening amongst women at midlife in... more To investigate the awareness of breast cancer (BCa) and BCa screening amongst women at midlife in Bangladesh. A nationally representative cross-sectional survey of women aged 30-59 years was conducted in 7 districts of the 7 divisions in Bangladesh, using a multistage cluster sampling technique. The factors associated with the awareness of BCa and breast assessment of asymptomatic women were investigated separately, using multivariable logistic regression. Of the 1590 participants, mean age 42.3 (±8.0) years, 81.9% had ever heard of BCa and 64.2% of any methods of BCa screening, respectively. Awareness of BCa was associated with being aged 40-49 years (adjusted OR 2.04, 95% CI 1.46-2.84), aged 49-59 years (1.96, 1.32-2.91), being overweight (1.46, 1.07-2.01) and obesity (1.62, 1.01-2.62), while inversely associated with rural dwelling (0.37, 0.22-0.61), primary education (0.44, 0.27-0.70), having no education (0.23, 0.14-0.36) and parity (0.62, 0.44-0.87). Of the 750 women who were aware of clinical breast examination (CBE) or mammography, reasons provided for not undergoing screening included that they had no symptoms (92%) and that they did not know screening was needed (40%). 8% of women reported CBE. Women with no education were less likely to have undergone CBE (0.38, 0.141.04; p=0.059). Lack of understanding of the assessment of asymptomatic women is the key obstacle to BCa screening uptake in Bangladesh. Health education programs, especially BCa awareness programs, have the potential to increase BCa awareness and down-staging of the disease.

Rural and remote health

Health 11: 1672. (Online) 2011 Available: http://www.rrh.org.au A B S T R A C T Introduction: Ant... more Health 11: 1672. (Online) 2011 Available: http://www.rrh.org.au A B S T R A C T Introduction: Antenatal and postnatal care services are significant interventions to improve maternal health and prevent maternal and infant deaths. However, these services are poorly developed in Bangladesh, particularly among Indigenous women. This study examined factors associated with antenatal and postnatal care visits among the Mru, the most underprivileged Indigenous people in Bangladesh. Methods: This cross-sectional study used both quantitative and qualitative methods. In total, 374 currently married Mru women with at least one child aged 5 years or younger were selected from 3 upazilas (sub-districts) of Bandarban District, Bangladesh for survey. In addition, in-depth interviews were performed with 26 Mru leaders, Mru women, traditional midwives, village 'doctors', school teachers, health and non-government organization workers. Associations between antenatal and postnatal care visits and the women's backgrounds characteristics were assessed by bivariate and multivariate analyses. Results: The traditional Mru prenatal and postnatal practices potentially inhibited women from seeking care. Both antenatal (11.2%) and postnatal (6.4%) care visits among the Mru women were lower than the national level. Most visits were to traditional midwives in their rural villages, rather than to health complexes or hospitals. The main reasons for lack of antenatal and postnatal care were travelling distance to care and transportation problems. Multivariate analysis revealed factors associated with antenatal © MR Islam, JO Odland, 2011. A licence to publish this material has been given to James Cook University, http://www.rrh.org.au 2

Optical pulling with tractor beams is so far highly dependent on (i) the property of embedding ba... more Optical pulling with tractor beams is so far highly dependent on (i) the property of embedding background or the particle itself , (ii) the number of the particles and/or (iii) the manual ramping of beam phase. A necessary theoretical solution of these problems is proposed here. This article demonstrates a novel active tractor beam for multiple fully immersed objects with its additional abilities of yielding a controlled rotation and a desired 3D trapping. Continuous and stable long distance levitation, controlled rotation and 3D trapping are demonstrated with a single optical set-up by using two coaxial, or even non-coaxial, superimposed non-diffracting higher order Bessel beams of reverse helical nature and different frequencies. The superimposed beam has periodic intensity variations both along and around the beam-axis because of the difference in longitudinal wave-vectors and beam orders, respectively. The difference in frequencies of two laser beams makes the intensity pattern ...

The study focuses on examining the stochastic process of return distribution in the Chittagong st... more The study focuses on examining the stochastic process of return distribution in the Chittagong stock exchange (CSE) to deliver persistency of weak form of efficiency and time varying risk -return association for an emerging country like Bangladesh. This study used daily series of market index (CASPI) data over the period from January 1st 2004 to September 30th 2014.The OLS, GARCH (1, 1) regression and GARCH (1, 1) with dummy variable models are employed to identify the existence of the day-of-the-week effect on stock market returns and volatility. The empirical findings attained from the models verified that the day-of-the-week effects on stock returns and volatility are persistent in the stock market. Specifically, a negative effect is observed for Sunday while a positive effect occurs on Thursday. Moreover, the highest volatility occurs on Sunday and lowest volatility found in Thursday. All statistically significant results confirm the absence of weak form of efficiency in Chittag...

Objectives: This article was aimed to examine the Contraceptive Prevalence Rate (CPR) and factors... more Objectives: This article was aimed to examine the Contraceptive Prevalence Rate (CPR) and factors that influence the current use of contraception among Mru women. Methods: The Mru is the most underprivileged indigenous community in Bangladesh since they are beyond geographical, linguistic, cultural and economic reach. In this study, 374 currently married Mru women were interviewed, selected purposively from three upazilas (administrative sub-districts) of Bandarban district, a part of the Chittagong Division and Chittagong Hill Tracts (CHT), where most of the Mru people live. Association between current use of contraceptives and the explanatory variables were first assessed in bivariate analysis using Chi-square test. A binary logistic regression model was also employed to explore the determinants of current use of contraceptives among the Mru community. Results: The CPR was much lower (25.1%) among the Mru people than the national level (55.8%). Among different modern and tradition...

Applied Physics Letters, 2015

ABSTRACT

European Journal of Medicinal Plants, 2015

IOSR Journal of Pharmacy and Biological Sciences, 2013

This study was designed to screen out free radical scavenging potentiality of 84 medicinal plants... more This study was designed to screen out free radical scavenging potentiality of 84 medicinal plants. Stock solution of different plant extracts and standard were diluted to achieve suitable concentrations. A control was also prepared without plant extract solution. Then 0.004% DPPH solution was added. The mixtures were incubated in the room temperature for 30 minutes. Then the absorbance was measured at 517 nm against solvent in UV-spectrophotometer and then IC50 was calculated. In this experiment two standard were usedascorbic acid and BHT. Both showed a significant IC50 value of 15.5µg/mL, and 46.54µg/mL respectively. Among 84 medicinal plants Syzygim cumini, Casuarina littorea, Borassus flabellifer, Enhydra fluctuans, and Minusops elengi exhibited highest radical scavenging potential with an IC50 value of 12.816µg/mL, 14.467µg/mL, 15.755µg/mL, 15.653µg/mL, and 20.380µg/mL respectively. All these value are very close to the IC50 value of ascorbic acid and better than IC50 value of BHT (Butylated Hydroxy Toluene). Syzygim cumini is the most powerful scavenger among all tested medicinal plants and also most strong scavenger than ascorbic acid and BHT. Scavenging activity was found to increase in dose dependent manner. Another 30 medicinal plants exhibited good scavenging property and 14 medicinal plants showed moderate scavenging activity. The rest presented lower scavenging activity. This present study indicates that plants having good scavenging property may have various health beneficial effects and these plants can be considered as valuable source of bioactive components with high antioxidant properties.