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Soy and legumes from Vietnam

Chao (Vietnamese fermented tofu)chao

Chao is Vietnam's fermented tofu, the same family as Chinese sufu. Tofu cubes grow a coat of the mould Actinomucor elegans in a warm, humid room for a day or so, then ferment in a salt brine with other additives. Researchers at Can Tho University have worked out pure spore starters for chao.

Fully documentedSoy and legumes8.8 days – 9.5 days

Recipe

No fixed amounts recordedTraditional makers use no fixed amounts. The numbers below come from two Can Tho University studies, one on the mould starter (Thanh 2011) and one on the mould stage, using tofu with purple sweet potato added (Phuc 2025).
Tofu, cut into 2 × 2 × 2 cm cubes[phuc2025]
Actinomucor elegans sporesA pure spore suspension in the 2025 study; a pure spore powder in the 2011 starter study[thanh2011][phuc2025]
Salt brine with other additives[phuc2025]
StarterMekong Delta chao makers use traditional natural fermentation (Thanh 2011); the studies instead use pure Actinomucor elegans spores, as a spore powder made on rice bran (Thanh 2011) or a spore suspension the tofu cubes are dipped in (Phuc 2025)

Total time across the recorded steps: 8.8 days – 9.5 days

Start
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shapes, not to countMucor racemosusRhizopus microsporusMoulds30–42 °C

What changes: Pure Actinomucor mould grows on rice bran and is dried into a spore powder

Step 1 of 5
Make the mould starter (improved method)
Time
8 days
Reported
Temperature
30–42 °C
Reported
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Mucor racemosus
Rhizopus microsporus
Moulds

After 5 months at 4 °C in polypropylene bags, 88.57 % of the spores were still alive. Output: dried spore powder, kept at 4 °C.

Flavour
Not documented
Texture
Not documented
Colour
Not documented

Microbes at work in this step

A. elegans grows and sporulates on the grain

Method

Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source

At a glance

Chao is Vietnam's fermented tofu, the same family as Chinese sufu. Tofu cubes grow a coat of the mould Actinomucor elegans in a warm, humid room for a day or so, then ferment in a salt brine with other additives. Researchers at Can Tho University have worked out pure spore starters for chao. Made in 5 steps over 8.8 days – 9.5 days. The longest step, make the mould starter (improved method), takes 8 days (Nguyễn Văn Thành 2011) and runs at 30–42 °C (Nguyễn Văn Thành 2011). Actinomucor elegans and Mucor racemosus (two strains, Dong Thap) and Rhizopus microsporus var. microsporus (Soc Trang), mould strains isolated from commercial pehtze in the Mekong Delta do most of the fermenting.

Key numbers
Main step8 daysReported[thanh2011]Make the mould starter (improved method)
Temperature30–42 °CReported[thanh2011]Make the mould starter (improved method)

What makes this one different

Chao follows the same mould-then-brine method as Chinese sufu (Han 2004). The Vietnamese studies read use a pure Actinomucor elegans starter, and one of them made it from a mould isolated from Chinese white sufu (Phuc 2025).

Related ferments

Variants

  • Purple chaoTofu made with purple sweet potato, studied for its antioxidants (Phuc 2025).

Safety

Naturally fermented chao from the Mekong Delta varies in quality and has been found contaminated with Aspergillus flavus and A. parasiticus, moulds that make aflatoxin (Thanh 2011, citing Võ Thị Hạnh et al. 2001). A pure starter is meant to stop this.

Hazards the sources name: Aspergillus flavus and A. parasiticus, aflatoxin-producing moulds found in some naturally fermented chao.

History and sources

Every number is labelled with how it is known. How this atlas is made

Both Can Tho studies describe chao as a traditional Vietnamese product, the counterpart of sufu in China. A 2004 Wageningen study of mould starters called chao very similar to sufu and isolated four mould strains from commercial pehtze in An Giang, Soc Trang and Dong Thap in the Mekong Delta. They proved to be Actinomucor elegans, two Mucor racemosus and Rhizopus microsporus [han2004].

  1. [thanh2011] Nguyễn Văn Thành, Trần Nguyễn Ngọc Quỳnh 2011, Nghiên cứu sản xuất starter Actinomucor elegans có mật số và sức sống cao dùng cải tiến chất lượng chao truyền thống, Tạp chí Khoa học Trường Đại học Cần Thơ 19a:194–203paper
  2. [phuc2025] Tran Minh Phuc, Nguyen Thi Thu Huong, Do Thi Tuyet Nhung, Duong Thi Phuong Lien, Ha Thanh Toan 2025, Evaluating the effect of the Actinomucor elegans strain on the antioxidant capacity of purple sweet potato into tofu during incubation, TNU Journal of Science and Technology 230(05):338–345paper
  3. [han2004] Han B.-Z., Kuijpers A.F.A., Thanh N.V., Nout M.J.R. 2004, Mucoraceous moulds involved in the commercial fermentation of Sufu Pehtze, Antonie van Leeuwenhoek 85:253–257, doi:10.1023/B:ANTO.0000020157.72415.b9paper