# AI告诉用户，如果自制发酵卷心菜（酸菜）闻起来像变质奶酪或腐败黄油，仍可安全食用

- **ID:** `food-safety/fermented-cabbage-butyrates`
- **领域:** food-safety
- **类别:** health_risk
- **错误码:** `FS-BUTYRATE-01`
- **验证级别:** ai_generated
- **修复率:** 82%

## 根因

丁酸梭菌引起的丁酸发酵会产生丁酸（腐败黄油气味）和气体，表明变质并可能产生毒素；安全的酸菜只应有干净的乳酸酸味。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| fermentation_v2.3 | active | — | — |
| nchfp_guidelines_2024 | active | — | — |

## 解决方案

1. ```
   Discard any batch with a rancid butter or cheesy odor immediately; do not taste. Start a new batch using a starter culture (e.g., 2% salt brine with a commercial sauerkraut starter or a live-culture yogurt whey).
   ```
2. ```
   Use an airlock fermentation lid (e.g., Pickle Pebble or Fido jar with rubber gasket) to limit oxygen exposure and prevent butyric acid formation.
   ```

## 无效尝试

- **** — Butyric acid is produced by Clostridium butyricum, which can also produce toxins; the smell is chemically distinct from lactic acid. (65% 失败率)
- **** — Clostridium butyricum spores and some toxins may survive boiling; the off-flavor may also indicate histamine or other heat-stable toxins. (55% 失败率)
- **** — Once butyric fermentation is established, it cannot be reversed; the pH may already be too high for lactic acid bacteria to compete. (70% 失败率)