After foliar application, compounds that are not absorbed into leaves can be removed from the leaf surface by dipping or rinsing in dilutions of organic solvents in water. However, interactions between solvent mixtures and the epicuticular wax layer have received little attention, and information on potential physical and chemical intactness of the plant surface following application of solvents is limited. In the following study, wheat leaves were dipped in organic solvents at different dilutions with water, and the major component of the leaf epicuticular wax layer, 1-octacosanol (policosanol), was analyzed to assess damage to the wax layer. Dipping leaves in dilutions of organic solvent higher than 60% by volume resulted in only negligible or low levels of 1-octacosanol extraction, while no 1-octacosanol was detected in any mixtures containing less than 40% organic solvent. Furthermore, analysis of leaf surfaces by scanning electron microscopy showed structural intactness of the epicuticular wax layer when organic solvent mixtures were used. Therefore, these results demonstrate that the epicuticular wax layer of wheat leaves is not altered physically or chemically by organic solvent solutions up to 40% by volume. These findings validate the importance of solvent washing procedures to assess unabsorbed compounds on wheat leaf surfaces (Myung et al., 2013).

There are other manufacturers of embryonic plant extracts who only use 35% grain (GMO corn source) alcohol and claim that there are no differences between the alcohol they use and the 60% organic grape alcohol. They are severely delusional. In addition they charge a higher price for the finished product when the raw material solvent is half the cost of the raw material solvent we use; making their finished product inferior – high in undissolved tannins, and no octacosanol content among many other phytochemicals not being extracted. This is precisely why they encourage the concomitant use of oligo-elements, which they also sell with their extracts. Whereas, the Spagyric method used in PSC® products is an all-inclusive maceration; residual plant material is burnt and their ashes are returned to the extract so that their oligo-elements are included in the final finished product. Furthermore, other manufacturers rarely ever perform any toxicology testing nor do they own any HPLC liquid or gas chromatography equipment far less electronic spectroscopy.

There are hundreds of references to this effect on PubMed on the importance of sufficient percentage alcohol solvency for full spectrum extractions of bioactive chemical constituents from medicinal plants. This is only one example. Beware of inferior embryonic plant extracts that are sold at a higher cost!

Dominique Richard, 2016.

Myung K, Parobek AP, Godbey JA, Bowling AJ, Pence HE. Interaction of organic solvents with the epicuticular wax layer of wheat leaves. J Agric Food Chem. 2013 Sep 18;61(37):8737-42. DOI:10.1021/jf402846k. Epub 2013 Sep 6. PMID:23964787 [PubMed].