Fuqu

What fuqu is

Fuqu (鹸曲, literally bran qu) is a bran-based starter used in Chinese liquor production. Researchers set it apart from other jiuqu categories, including daqu and xiaoqu, whose materials and practices vary. The catalogue behind this page calls it a starter family often developed with selected moulds and additional fermentation organisms, and stresses that it is a production format and not one fixed taxon.

A starter format is not the same as a species, a selected strain or the distilled liquor made with it. A bran starter also cannot be assumed to hold the same yeast population as a sweet rice-wine ball starter, so each supplied culture needs its own specification.

Different sources, different starters

The literature describes more than one fuqu formulation. A 2013 laboratory study prepared bran starter with a pure culture of Aspergillus oryzae. A 2015 study found a different set of bacteria, mould and yeast in one sampled fuqu. A review describes fungal, yeast and bacterial fuqu variants. These are examples from particular papers, not one standard culture list.

The microbial percentages in the 2015 paper describe one product sample and the study's clone-library method. They do not identify organisms to isolate for a new starter.

How it is used

Research reports fuqu in the production of sauce-, light- and sesame-flavour Chinese liquor. In the sesame-flavour examples it is combined with daqu. It contributes to particular production systems and is not interchangeable with daqu or with the later liquor. One Chinese technical paper examines conditions for fermenting Maotai-flavour liquor with bran starter.

What the evidence does not establish

No earliest dated historical attestation or general production season was identified. The laboratory papers and reviews give no complete, validated household method, starter shelf life or universal process limit, so none is offered. Fuqu terminology and formulations outside these studies need local producer documentation.