Triterpene glycosides of ladyginia bucharica III. Structure of ladyginoside C
SummaryThe structure of ladyginoside C — a trioside of oleanolic acid — has been established. The carbohydrate chain is attached to the hydroxyl at C3 of the aglycone and consists of β-D-glucopyranosyl-(1→4)-α-L-arabopyranosyl-(1→4)-β-D-glucopyranuronic acid.
Thin-layer chromatography of carbohydrates.
The separation of carbohydrates on thin layers of silica gel is due first of all to the type and quantity of impregnating salt. 
 
The results of chromatography of carbohydrates on thin layers of silica gel in the presence of sodium mono- and dihydrogen phosphate are often better than those of paper chromatography (e.g. a good separation of complex mixtures, less sensitivity to inorganic impurities, and faster separation). 
 
The present method can be recommended for the study of the monosaccharide composition of oligo- and polysaccharides.
Interaction of Diclofop-Methyl and MCPA on Wild Oats (Avena fatua)
Diclofop-methyl {methyl 2-[4-(2,4-dichlorophenoxy)phenoxy] propanoate} loses part of its activity on wild oats (Avena fatua L.) when it is applied in combination with ester or amine formulations of MCPA {[4-chloro-o-tolyl)oxy] acetic acid.} Uptake of diclofop-methyl is reduced in the presence of commercial formulations of MCPA, particularly amine formulations, which are only partly compatible with the diclofop-methyl formulation. With added MCPA, regardless of formulation, hydrolysis of diclofop-methyl to the acid diclofop is slowed down, both in intact wild oat plants and in a crude leaf extract. At the same time, conversion of any acid formed to inactive conjugates is accelerated in the presence of MCPA. It is concluded that the loss of activity of diclofop-methyl by MCPA can be accounted for by the effects of MCPA on uptake and metabolic conversion of diclofop-methyl.