Organic substances may be very weak against oxidative degra­dation mechanisms; therefore the stability of raw materials and natural products may be poor and challenging. To process successfully even complex product formulations, one may be concerned about the quality of incoming raw natural materials, semi-finished and finished goods, logistic conditions and the shelf life resulting from all these different factors.

Characterisation of the hydroperoxide concentration (ROOH: measurement of the hydroperoxide decay in inert gas atmosphere) of triterpenoid resins: dissolved in hydrocarbon solvent (blue curve, free of aromatics) and in oil of turpentine (green curve). Triterpenoids contain high concentrations of ROOH. Due to the dissolution of the resin in oil of turpentine, the hydroperoxides are removed. The dissolution in the inert hydrocarbon solvent doesn’t decompose the ROOH. Testing conditions: non-isothermal (dynamic) temperature profile from 35 to 130°C, heating rate = 0.58 Kmin-1, gasflow = 30 mlmin-1.
triterpene varnish
Oxidation of unstabilised natural rubber at different non-isothermal temperature profiles in air. With decreasing heating rate (dark curves), the oxidation reaction shifts toward lower temperature levels. Measurement conditions: non-isothermal (dynamic) temperature profiles from 25 to 180°C, heating rates from 0.005 to 0.072 Kmin-1, gasflow = 30 mlmin-1.
natural rubber
Study of the cleaning effects on the stability of silk textile in air: untreated blank sample (4_0), dry cleaned sample (4A), in water solution cleaned sample (4B), laser cleaned (Nd:YAG, Q-switched-Laser) samples with 4 pulses each and energy levels of 0.2 Jcm-2 (4_0.2x4) and 1.5 Jcm-2 (4_1.5x4). Testing conditions: non-isothermal (dynamic) temperature profile from 25 to 160°C, heating rate = 0.094 Kmin-1, gasflow = 30 mlmin-1.

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