enzymatic debittering of fenugreek

A processing method treats fenugreek seeds with an enzyme to reduce bitterness, preparing 「低苦味フェヌグリーク(FRB)」 (in translation: "reduced-bitter fenugreek (FRB)"). The abstract of a paper published in 2012 explains this process as 「fenugreek with reduced bitterness (FRB) is prepared by treating fenugreek with beta-glucosidase(β-グルコシダーゼによる処理で低苦味フェヌグリークを調製する)」 (in translation: "fenugreek with reduced bitterness (FRB) is prepared by treating fenugreek with beta-glucosidase"). However, the full paper's Methods section identifies the enzyme actually used as a cellulase preparation (SPEZYME CP; made by Genencor), so the enzyme names in the abstract and the main text disagree. The same wording was confirmed in 2 independent retrievals, suggesting an inconsistency retained in the paper itself rather than a simple transcription error.

This enzyme treatment converts protodioscin, a saponin component thought to contribute to bitterness, into dioscin, which the authors describe as non-bitter. The paper reports conversion rates of 82% in experiment 1 and 96% in experiment 2. However, it presents no data measuring bitterness itself through human sensory evaluation, and the source of sensory data supporting the statement 「ジオシンは無苦味である」 (in translation: "dioscin is non-bitter") cannot be identified from the text. Quantitative data on chemical conversion should therefore be distinguished from a change in bitterness as actually perceived.