Determination of Cu, Zn, Fe, Pb and Cd concentration in selected locally available herbs in fresh and in its processed form

Kalwinder Kaur Manjeet Singh, (2007) Determination of Cu, Zn, Fe, Pb and Cd concentration in selected locally available herbs in fresh and in its processed form. Universiti Malaysia Sabah. (Unpublished)


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In this study, comparison of metals concentration such as iron, copper, zinc, lead and cadmium (toxic metals) were carried out in three types of fresh herbs namely Peppermint, Cat's Whiskers and Tongkat Ali. Besides that, research was also done on processed samples of these herbs that are available in market. These samples were BOH Peppermint Tea, Dry Cat's Whiskers and Dry Tongkat Ali. The concentration of tested metals was determined by using Atomic Absorption Spectrophotometry (Flame). The fresh herb shows the highest concentration of iron, ranges 76.08 ± 0.03µg/g to 123.8 ± 0.05µg/g. Meanwhile found to be that these herbs shows the lowest concentration of cadmium, between 0.03 ± 0 . 03µg/g to 0.25 ± 0 . 05µg/g . Peppermint was detected to have highest copper, iron and zinc concentration. In overall processed samples, the highest concentration is shown for iron. The lowest concentration is detected for cadmium. However, Tongkat Ali found to have the highest concentration among samples for toxic metals such as cadmium and lead, range from 0.17 ± 0.003µg/g to 0.25 ± 0.05µg/g. For comparison of fresh and processed samples, the highest difference of metal concentration is detected for iron between fresh Peppermint and BOH Peppermint Tea, this range between 123.80 ± 0.05µg/g and 1915.0 ± 25.0µg/g . However, for toxic metal (cadmium concentration), the biggest difference is shown between fresh Peppermint and BOH Peppermint Tea, range 0.10 ± 0.05µg/g to 0.25 ± 0. 09µg/g. A comparison between fresh and processed samples showed significant differences (p<0.05) for all the metal concentration. The heavy metals concentration in fresh herbs and its processed product is still at low and safe level and meets the requirements of Malaysian Food Act 1983 and Food Regulations 1985.

Item Type: Academic Exercise
Uncontrolled Keywords: metals concentration, Peppermint, Cat's Whiskers, Tongkat Ali, Atomic Absorption Spectrophotometry
Subjects: T Technology > TX Home economics > Nutrition. Foods and food supply
Divisions: SCHOOL > School of Food Science and Nutrition
Date Deposited: 20 Feb 2014 05:31
Last Modified: 11 Oct 2017 08:28

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