Comparison of different methods for the determination of the water content and the dry mass correction factor in various plant samples

Stegen, S.; Queirolo, F.; Ostapczuk, P.; Groemping, A.; Paz, María Dolores; Restovic, M.; Carrasco, Cosme Jesús Gómez

doi:10.1007/s002160050765

Cited by 5 publications

(2 citation statements)

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“…The loss of these organic compounds during drying can result in a discrepancy in the calculated pigment concentrations based on either the FM or DM calculations and has been attributed to a dilution effect (Lefsrud et al, 2006(Lefsrud et al, , 2007. Karathanos (1999) and Stegen et al (1998) reported decreases in %DM when oven drying temperatures were greater than +65°C. Karathanos (1999) suggested that the decrease in %DM was the result of decomposition of low-molecular-weight sugars during water evaporation.…”

Section: Discussionmentioning

confidence: 99%

Dry Matter Content and Stability of Carotenoids in Kale and Spinach During Drying

Lefsrud¹,

Kopsell²,

Sams³

et al. 2008

horts

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Drying of spinach (Spinacia oleracea L.) and kale (Brassica oleracea L. var. acephala D.C.) is required to determine percentage of dry matter (%DM) and pigment concentration of fresh leaves. ‘Melody’ spinach and ‘Winterbor’ kale were greenhouse-grown in hydroponic nutrient solutions containing 13 or 105 mg·L−1 N. Using vacuum freeze dryers and convection ovens, plant tissues were dried for 120 h at five different temperature treatments: 1) freeze drying at −25 °C; 2) freeze drying at 0 °C; 3) vacuum drying at +25 °C; 4) oven drying at +50 °C; and 5) oven drying at +75 °C. Spinach leaf tissue %DM was affected, but kale %DM was unaffected by drying temperature. Spinach and kale leaf tissue %DM were both affected by N level. The high N spinach decreased from 7.3 to 6.4%DM when drying temperature increased from +25 to +75 °C. The low N spinach decreased from 12.7 to 9.6%DM as the drying temperature increased from −25 to +50 °C. Kale averaged from 14.8%DM for the high N treatment and from 21.8%DM for the low N treatment. However, drying temperature did not have a significant impact on measured %DM in kale. Lutein, β-carotene, and chlorophyll levels for both spinach and kale leaf tissue were affected by drying temperature. Measured concentrations of all pigments decreased over 70% as the drying temperature increased from −25 to 75 °C. The largest pigment fresh and dry weight concentrations for spinach and kale were measured at drying temperatures below +25 °C. The spinach and kale samples dried between −25 and +25 °C were not significantly different from each other in %DM or pigment concentration measured on a dry or fresh weight basis. Thus, drying leaf tissue for accurate pigment analysis requires temperatures below +25 °C using vacuum or freeze drying technology.

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Section: Discussionmentioning

confidence: 99%

Dry Matter Content and Stability of Carotenoids in Kale and Spinach During Drying

Lefsrud¹,

Kopsell²,

Sams³

et al. 2008

horts

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show abstract

“…Potato and broad bean skin was removed with a quartz knife, since it is sometimes consumed. Water content and the mass correction factor were determined by freeze-drying because water determination by an oven is not recommended for beans and their skin 35 . Water content values were in the 72-79 % range for potatoes, 81-86% for potato skin (pskin), 78 a 80% for broad bean, 92-90% for broad bean skin (bskin) and 75-83% for maize, depending on the sampling site.…”

Section: Sampling and Pretreatmentmentioning

confidence: 99%

Thallium Levels and Bioaccumulation in Environmental Samples of Northern Chile: Human Health Risks

Queirolo

Stegen

Contreras‐Ortega

et al. 2009

J. Chil. Chem. Soc.

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Thallium (Tl) is a highly toxic heavy metal; however there is an increasing demand for thallium in the high-technology and a lack of information in the literature. On the other hand, under natural conditions, Tl occurs in large quantities rarely and plays no role in the metabolism of plants or animal. Studies on the presence of Tl in the vicinity of a copper mining-impacted region in northern Chile were carried out. A number of different types of environmental samples such as crop plants (potato, broad bean and maize), water, algae (Myriophyllum acuaticum, Zannichellia palustris L.) and one plant species (Tessaria absinthioides) growing wildly in the same area, were examined. All of them are exposed to a natural environmental contamination and to the impact of the copper mining activity throughout the region. Thallium concentration in plants exhibits species-dependent preferences. Thus, the enrichment of Tl in the edible parts of crop species decreases in the following order: potato > broad bean > maize grain. Thallium contents, expressed as dry weight (d.w.), varied from < 0.001 to 6.8 µgg-1 in crop plants, from 0.295 to 8.3 µgg-1 in algae, and between 0.010 and 0.501 µgg-1 in plant samples (2-10 times the level normally found in plants, 0.05 µgg-1 dry wt). Dissolved Tl concentrations in rivers were found to be 6 to 120 ngL-1. In the current study, the risk for adverse health effects derived from ingestion from potatoes was assessed. It shows that there is an important risk for the infantile and adult population at present.

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Introduction to Sample Preparation for Trace Element Determination

Barnes¹,

Júnior

Krug

2014

Microwave-Assisted Sample Preparation for Trace Element Analysis

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Comparison of different methods for the determination of the water content and the dry mass correction factor in various plant samples

Cited by 5 publications

References 1 publication

Dry Matter Content and Stability of Carotenoids in Kale and Spinach During Drying

Dry Matter Content and Stability of Carotenoids in Kale and Spinach During Drying

Thallium Levels and Bioaccumulation in Environmental Samples of Northern Chile: Human Health Risks

Introduction to Sample Preparation for Trace Element Determination

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