Heavy Metals and Essential Elements in Selected Medicinal Plants Commonly Used for Medicine in Tanzania

Nkuba, Leonid L.; Mohammed, Najat K.

doi:10.9734/csji/2017/31963

Cited by 18 publications

(15 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Ni levels were in agreement with those reported in the literature [16]. Nkuba and Mohammed (2017) [15] reported the Ni levels (mg/kg dw) ranging from 0.09-4.89, 0.33-3.08 and 0.98-2.15 in M. oleifera leaves, roots and H. sabsdariffa, respectively. Dghaim et al (2015) [12] reported that the Cu concentrations in the in selected traditional herbs consumed in the United Arab Emirates (UAE), purchased from the local market in Dubai were: 1.44 -156 mg/kg dw.…”

Section: Nisupporting

confidence: 91%

“…Ting et al (2013) [22] reported a Cu range of 0.08-0.35 mg/kg (based on boiled and non-boiled decoctions) in four commonly consumed TCHMs in Malaysia namely "Eight Treasure Herbal Tea", "Herbal Tea", Xiyang shen (Radix panacis quinquefolii) and Dangshen (Radix codonopsis) ", which were bought randomly from two shops in Kuala Lumpur (but the sampling dates were not specified). Nkuba and Mohammed (2017) [15]…”

Section: Cumentioning

confidence: 99%

See 1 more Smart Citation

Heavy Metals (Cu, Fe, Ni and Zn) in Traditional Chinese Herbal Medicines Bought from Selected Shops from Peninsular Malaysia

Yap¹

2018

FSNT

View full text Add to dashboard Cite

A total of 20 Traditional Chinese Herbal Medicine (TCHM) was bought randomly from shops in three states of Peninsular Malaysia. All of these samples were analyzed for Cu, Fe, Ni and Zn concentrations. Based on samples collected from selected shops in Peninsular Malaysia, the levels of Cu, Fe, Ni and Zn in the TCHM samples were comparable to reported studies of TCHM products in the literature. The levels of essential Fe and Zn were found to be higher than the levels of the essential Ni and Cu. The present levels of the 20 TCHM products from Malaysia can serve as important baseline information for future reference in the establishment of MRLs of the four less common heavy metals in Malaysia as well as in this region. Therefore, it is difficult to conclude whether the TCHM products are safe from contamination of Cu, Fe, Ni and Zn since the MRLs for Cu, Fe, Ni and Zn have not been recommended by WHO. Future regular monitoring, quality control and adequate regulatory measures of TCHM products for heavy metals are necessary.

show abstract

Section: Nisupporting

confidence: 91%

Section: Cumentioning

confidence: 99%

Heavy Metals (Cu, Fe, Ni and Zn) in Traditional Chinese Herbal Medicines Bought from Selected Shops from Peninsular Malaysia

Yap¹

2018

FSNT

View full text Add to dashboard Cite

show abstract

“…Cd contamination of plants comes from the use of phosphate fertilizers (Eludoyin & Ogbe, 2017). Due to the high cadmium and iron content of the plant, it is necessary to be careful about its consumption (Nkuba & Mohammed, 2017).…”

Section: Discussionmentioning

confidence: 99%

Phenolic compounds, biological activities and trace elements of Capparis ovata var. canescens

Taşkın

Çam

et al. 2020

RBT

View full text Add to dashboard Cite

Introduction: Capparis species (Capparaceae), also called caper, grow naturally in various regions of the world. Caper is a plant with medicinal and aromatic properties. Flower buds, root bark, and fruits of the plant are used in folk medicine due to their analgesic, wound healing, cell regeneration, tonic, and diuretic effects. Objective: The aim of this research was to evaluate in vitro (anti-urease, antioxidant, anticholinesterase) and in vivo (anti-inflammatory) biological activities of caper (C. ovata var. canescens). In addition, we aimed to identify its major phenolic compounds using high performance liquid chromatography with a photodiode array detector (HPLC-DAD) and confirmate them using quadrupole time-of-flight liquid chromatography with tandem mass spectrometry (Q-TOF-LC/MS). Also, we quantified the concentrations of several trace and major elements in plant samples using inductively coupled plasma-mass spectrometry (ICP-MS). Methods: The antioxidant, anti-urease and anticholinesterase activities of different plant extracts were evaluated using DPPH, FRAP, ABTS/TEAC, Indophenol and Ellman tests. The identification of phenolic compounds and trace element contents was performed using HPLC and Q-TOF-LC/MS and ICP-MS. Results: Soxhlet methanol extract exhibited the strongest anti-urease, antioxidant (ABTS/TEAC) and anticholinesterase activity. Soxhlet and maceration methanol extracts demonstrated significant anti-inflammatory effect in the altered edema size after the second hour of carrageenan injection. The active phenolic compounds in Soxhlet methanol extract were identified as rutin, quercetin-hexoside-hexoside, quercetin-3-O-hexoside and kaempferol-3-O-rutinoside. In addition, the average concentrations of vanadium, chromium, manganese, cobalt, copper, nickel, arsenic, selenium, zinc and lead were within the permissible limits defined by WHO for medicinal plants. However, it was found that the concentrations of cadmium and iron were higher than the maximum permissible limits. Conclusion: Our results suggest that although caper has a strong biological activity, it should be consumed carefully due to the excess amount of cadmium and iron elements it contains.

show abstract

“…The results of these studies showed that manganese and cobalt exceeded the allowable limits [ 31 ]. Another study in Tanzania showed that the concentrations of Mg, Mn, Fe, and Ni in medicinal plants were higher than the allowed limits [ 32 ]. It is important to emphasize that even if the heavy metal contamination is within the internationally accepted limits, there is still a high chance of accumulation of these elements in the body that reach toxic levels [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Heavy Metal and Microbial Contamination in Green Tea and Herbal Tea Used for Weight Loss in the Palestinian Market

Abualhasan

Jaradat

Hawash

et al. 2020

Evidence-Based Complementary and Alternative Medicine

View full text Add to dashboard Cite

The use of green tea and herbal tea for weight loss is increasing worldwide owing to the rising rates of obesity. There are concerns about the safety and quality of these herbal products owing to their increased consumption worldwide. In this study, we evaluated randomly collected samples of green tea and herbal tea and tested them for heavy metal and microbial contamination. Eighteen samples of green tea or herbal tea of widely used brands in Palestine were tested for heavy metal and microbial contamination. The results showed that 7 of the samples had toxic heavy metals such as chromium (Cr) and lead (Pb), and their concentrations were above the allowable limits set by the World Health Organization (WHO). Moreover, 6 of the samples that were tested had microbial contamination with high total aerobic microbial count (TAMC) and total yeast and mold count (TYMC). This could be due to improper handling and storage conditions of these herbal products. This study is the first of its kind in Palestine, and its results are forewarning to all the responsible authorities, including the Ministry of Health (MoH), to take immediate corrective actions such as quality control testing, auditing, and registration of marketed tea products.

show abstract

Heavy Metals and Essential Elements in Selected Medicinal Plants Commonly Used for Medicine in Tanzania

Cited by 18 publications

References 24 publications

Heavy Metals (Cu, Fe, Ni and Zn) in Traditional Chinese Herbal Medicines Bought from Selected Shops from Peninsular Malaysia

Heavy Metals (Cu, Fe, Ni and Zn) in Traditional Chinese Herbal Medicines Bought from Selected Shops from Peninsular Malaysia

Phenolic compounds, biological activities and trace elements of Capparis ovata var. canescens

Evaluation of Heavy Metal and Microbial Contamination in Green Tea and Herbal Tea Used for Weight Loss in the Palestinian Market

Contact Info

Product

Resources

About