How to distinguish iron rod yam
Tiegun yam, as a nourishing product that has the same source of medicine and food, has been favored by consumers in recent years. However, there are many counterfeit products on the market, and how to distinguish the genuine from the fake has become a hot topic. This article combines the hot discussions on the entire Internet in the past 10 days to conduct a structured analysis of the identification methods of iron stick yam from the dimensions of appearance, taste, origin and other dimensions.
1. The core characteristics of Tiegun Yam
| Feature type | Authentic Iron Bar Yam | Ordinary yam/imitation |
|---|---|---|
| Appearance shape | Slender and uniform (diameter 1-3cm), with rust stains on the surface | Thick, short and irregular, with smooth skin and no rust spots |
| cross section | Less mucus, fine cross section and porcelain white color | There is a lot of mucus, and the cross section is rough and grainy. |
| Taste | After steaming, it becomes glutinous and sweet, and will not fall apart after being cooked for a long time. | Crisp, hard and fragrant, easy to cook |
2. Key points of origin traceability
According to the geographical indication certification data of the Ministry of Agriculture and Rural Affairs:
| Core production areas | soil properties | Proportion of output |
|---|---|---|
| Wen County, Henan | Loess soil (clay content＞30%) | 68% |
| Hebei Li County | sandy loam | 22% |
| Other areas | Ordinary loess | 10% |
3. Warning of recent market chaos
Combined with consumer complaint platform data (statistics in January 2024):
| Common methods of counterfeiting | Identification method | Complaint proportion |
|---|---|---|
| Sulfur smoked and whitened | Pungent and sour smell, discoloration after prolonged exposure | 41% |
| Common yam dyeing | Wipe off the color with wet wipes | 33% |
| Mixed sales | Single weight difference＞20% | 26% |
4. Professional identification skills
1.Bend test: The original product can be bent 90° without breaking, while the imitation product is easy to break.
2.Iodine test: The genuine product has no obvious discoloration after dropping iodine (low starch content)
3.price comparison: The market price of yam from Lotu Iron Bar is more than 35 yuan/jin, and if it is less than 25 yuan, most of them are imitations.
5. Comparison of nutritional data
| Nutritional information | Iron rod yam (per 100g) | Ordinary yam (per 100g) |
|---|---|---|
| mucin | 1.8g | 0.6g |
| starch | 15g | 22g |
| diosgenin | 38mg | 12mg |
Conclusion:When purchasing, you should look for geographical indications and check the test report. It is recommended to give priority to original ecological packaging with soil. We need to be wary of the "low-price pre-sale" trap that has appeared on e-commerce platforms recently. Due to the limited harvest period of authentic iron-bar yam (excavation after frost), there should not be a large amount of inventory in the current season.
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