Magnesium Silicate

Rashid, Iyad; Daraghmed, Nidal H.; Omari, Mahmoud M. Al; Chowdhry, Babur Z.; Leharne, Stephen A.; Hodali, Hamdallah A.; Badwan, Adnan A.

doi:10.1016/b978-0-12-387667-6.00007-5

Cited by 29 publications

(16 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Commission Regulation (EU) No 231/2012, magnesium trisilicate is insoluble in water and ethanol; however the Panel considered that a similar behaviour to calcium silicate and magnesium silicate would be expected at equilibrium for magnesium trisilicate. This assumption is also supported by the literature (Rashid et al., ). According to Commission Regulation (EU) No 231/2012 and information from industry (EUROTALC, 2018; Documentation provided to EFSA n. X), talc is insoluble in water.…”

Section: Assessmentsupporting

confidence: 84%

“…General methods for the analysis of silicates were reviewed by (Rashid et al., ). These relate mainly to the analysis of aqueous samples.…”

Section: Assessmentmentioning

confidence: 99%

“…According to Rashid et al. (), it is practically insoluble in water and in ‘dilute’ mineral acids, but it dissolves practically at concentrations up to 3 M of the acid and dissociates under these conditions to magnesium cations and silicic acid. The Panel assumed that, when talc dissociates, the associated water molecules are liberated in the solution.…”

Section: Assessmentmentioning

confidence: 99%

See 2 more Smart Citations

Re‐evaluation of calcium silicate (E 552), magnesium silicate (E 553a(i)), magnesium trisilicate (E 553a(ii)) and talc (E 553b) as food additives

Younes¹,

Aggett²,

Aguilar³

et al. 2018

EFS2

View full text Add to dashboard Cite

Re-evaluation of calcium silicate (E 552), magnesium silicate (E 553a(i)), magnesium trisilicate (E 553a(ii)) and talc (E 553b) as food additives AbstractThe EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS) provides a scientific opinion re-evaluating the safety of calcium silicate (E 552), magnesium silicate (E 553a) and talc (E 553b) when used as food additives. In 1991, the Scientific Committee on Food (SCF) established a group acceptable daily intake (ADI) 'not specified' for silicon dioxide and silicates. The EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS) recently provided a scientific opinion re-evaluating the safety of silicon dioxide (E 551) when used as a food additive. The Panel noted that the absorption of silicates and talc was very low; there was no indication for genotoxicity or developmental toxicity for calcium and magnesium silicate and talc; and no confirmed cases of kidney effects have been found in the EudraVigilance database despite the wide and long-term use of high doses of magnesium trisilicate up to 4 g/person per day over decades. However, the Panel considered that accumulation of silicon from calcium silicate in the kidney and liver was reported in rats, and reliable data on subchronic and chronic toxicity, carcinogenicity and reproductive toxicity of silicates and talc were lacking. Therefore, the Panel concluded that the safety of calcium silicate (E 552), magnesium silicate (E 553a(i)), magnesium trisilicate (E 553a(ii)) and talc (E 553b) when used as food additives cannot be assessed. The Panel considered that there is no mechanistic rationale for a group ADI for silicates and silicon dioxide and the group ADI established by the SCF is obsolete. Based on the food supplement scenario considered as the most representative for risk characterisation, exposure to silicates (E 552-553) for all population groups was below the maximum daily dose of magnesium trisilicate used as an antacid (4 g/person per day). The Panel noted that there were a number of approaches, which could decrease the uncertainties in the current toxicological database. These approaches include -but are not limited to -toxicological studies as recommended for a Tier 1 approach as described in the EFSA Guidance for the submission of food additives and conducted with an adequately characterised material. Some recommendations for the revision of the EU specifications were proposed by the Panel.

show abstract

Section: Assessmentsupporting

confidence: 84%

“…General methods for the analysis of silicates were reviewed by (Rashid et al., ). These relate mainly to the analysis of aqueous samples.…”

Section: Assessmentmentioning

confidence: 99%

Section: Assessmentmentioning

confidence: 99%

See 1 more Smart Citation

Re‐evaluation of calcium silicate (E 552), magnesium silicate (E 553a(i)), magnesium trisilicate (E 553a(ii)) and talc (E 553b) as food additives

Younes¹,

Aggett²,

Aguilar³

et al. 2018

EFS2

View full text Add to dashboard Cite

show abstract

“…Characteristic peak of magnesium silicate structure (Si-O-Si symmetrical stretching vibration) was found at 1016 cm -1 30 . Moreover, the bands at 662 and 462 cm -1 were arisen from Si-O bending and Mg-O vibration, respectively 30 . The scanning electron microscopic (SEM) image of the prepared magnesium silicate hydrate is illustrated in (Fig.…”

Section: Materials Characterizationmentioning

confidence: 99%

Synthesis of Magnesium Silicate Hydrate as an Adsorbent for Different Dyes

Panith

Wattanathana

Deeloed³

et al. 2019

Orient. J. Chem

View full text Add to dashboard Cite

Magnesium silicate hydrate was synthesized for using as an adsorbent for different commercial organic dyes. X-ray diffraction (XRD) confirmed the crystalline phase of magnesium silicate hydrate. Some characteristic absorption bands of the magnesium silicate hydrate structure were observed in the Fourier transform infrared spectroscopy (FTIR) spectrum which supported the result identified from XRD data. Analysis of surface area and porosity by surface area analyzer showed that the synthesized magnesium silicate had high surface area of 634.63 m2/g and also showed the average BJH pore size of 3.72 nm. Insight into the sorption isotherm curve, the hysteresis characteristic was clearly observed suggesting a presence of mesopores within the obtained material. Dye adsorption study revealed that the synthesized adsorbent had the strongest affinity to the cationic dye (methylene blue) on account of the negative charge on the surface of the adsorbent. Hence, the adsorption of methylene blue was reached the equilibrium at the fastest time. In all, the results showed a possibility to apply this prepared magnesium silicate materials as a selective adsorbent for cationic dyes.

show abstract

“…The DTG plot displays several peaks that correlate with the endothermic and exothermic peaks of DSC, where the weight loss of the composite happens. 76 The composite undergoes about 15% weight loss in the temperature range (30-175) C. Even though the level of weight loss varies according to the constitutional components of the composites, MXPAT, MXPATPN, MXPATPNPA, MXPATPPy, MXPATPTh and uMXPAT lose (16.81, 14.71, 13.37, 13.86, 14.33, 13.65, and 13.69) % of weight, respectively, and the corresponding temperatures are (194.17, 194.81, 190.77, 194.17, 180.14, 176.52, and 185.45) C, respectively. The total reductions of weight of MXPAT, MXPATPN, MXPATPNPA, MXPATPPy, MXPATPTh, and uMXPAT are (65.69, 58.86, 56.67, 55.09, 66.11, 63.54, and 59.05) %, respectively, in the entire temperature range of (30-1000) C ( Fig.…”

Section: Raman Spectroscopic Analysis Of Compositesmentioning

confidence: 99%