Within one type of food, the higher the dry matter the higher the ash. Between foods I am not aware of any relationship. Different foods have different compositions, so a relationship is not to be expected.

Yeah! This is logical, thank you Kan. I appreciate your quick response.

Yes, I agree with Profs. Kan and Tawfiq. My understanding is that the water content (moisture) of a food sample will definitely affect the concentration of its chemical components and therefore its mineral components (Ash) in that sample. This is because the water content affects the initial weight of the sample.

Just to add.....

Regards!

The moisture content of ash is considered an important analysis in food, where the reverse ratio, the higher the humidity the less the food content of the ash and vice versa, because the estimate of the proportion of ash depends on the method of dry incineration, almost no moisture content should be drying the material first "in the furnace incineration and residual Of which is estimated based on the percentage of residual ash, ie, its mineral content

Thank you @Tawfiq, @Difo and @Fatima, I really appreciate your thinking.

Interesting C.A. (Kees) Kan remark, different foods have different compositions, this way a general relationship is not to be expected, and it can change depending on the matrix.

I concur with C.A Kan. In simple terms, the higher the moisture content, the lower the dry matter content (ash).

Thank you Elisabeth Borges Goncalves and William Ssali for your contributions. But William Ssali, I needed to know the relationship between moisture and ash content in the first place, not between moisture content and dry mater. In fact, dry matter (DM) and ash are two different things. To my knowledge DM is what remains when only water (moisture) is removed from a food (DM basically contains organic matrix and minerals), while Ash is the powdery residue left after the burning of a substance (only minerals remain). This is to say that mineral is a "subset" of the DM, so I don't think we can consider ash as the dry matter directly. I agree with Elisabeth Borges Goncalves that a conclusive relationship is not anticipated in several food types, but what about single food crop or food item!?. I need to hear from you once again.

There is no any clear relationship between moisture content and the ash content. Ash content depends on the food variety.

I agree with Gayan.