**3. Result and discussion**

## **3.1 Nutritional composition**

**Table 1** shows the nutritional composition of dark chocolate-coated Chinese chestnut. Except for the moisture content, all compositions were measured using dry materials (**Table 1**). The prepared chocolate contained no extra ingredients when compared to commercial fruit and nut dark chocolate, which is made up of preservatives and other sweeteners. The dark chocolate-coated chinese chestnut is therefore highly fascinating and appears to be beneficial for human health, as proved by its overall high nutritional quality.

By using a glancing angle X-ray diffractometer with monochromatic Cu-K as the radiation source (45 kV and 20 mA), the XRD pattern of the prepared sample was recorded (**Figure 11**). As shown in **Figure 11**, the XRD measurements were made in the range of 2θ from 5° to 90°.

The sample's obtained diffraction pattern reveals its amorphous nature. Using Debye Scherrer's formula, the sample's crystallite size (Dhkl) was estimated-.

$$\mathbf{D}\_{h\mathbf{k}1} = \frac{\mathbf{0}.\mathbf{9}\lambda}{\mathcal{B}\_{hkl}{}^{\mathrm{Ca}}\left(\theta\_{hkl}\right)}$$

Here λ represents the X-ray wavelength, θhkl indicates the Bragg diffraction angle and βhkl represents the full width at half maximum (FWHM) of the major peaks in XRD pattern in radians.

The sample's crystallite size was determined to be 76.30 nm.
