Influence of Physicochemical Characteristics on the Effective Moisture Diffusivity in Tobacco

Figures & data

TABLE 1 Varieties of tobacco used in experiment

Cured type	Varieties	Sample name	Produce origins	Leaf position
Flue-cured	Yun 85	Chuxiong-B	Yunnan Province, China	upper
		Yuxi-C	Yunnan Province, China	middle
		Yuxi-X	Yunnan Province, China	lower
	K326	Bozhou-B	Anhui Province, China	upper
		Bozhou-X	Anhui Province, China	lower
		Chenzhou-B	Hunan Province, China	upper
		Zhumadian-CX	Henan Province, China	middle-lower
		Zimbabwe-B	Zimbabwe	upper
Air-cured	Burley	JianShi-C	Hubei Province, China	middle

TABLE 2 Equilibrium moisture content in different ambient environment at 30°C^a

Cured type	Varieties	Samples	RH = 33%	RH = 43%	RH = 75%	RH = 83%
Flue-cured	Yun 85	Chuxiong-B	8.30 ± 0.10^a	11.40 ± 0.20^a	27.30 ± 0.20^a	34.7 ± 0.3^a
		Yuxi-C	7.28 ± 0.06^b	10.90 ± 0.10^b	29.40 ± 0.20^b	38.0 ± 0.5^b
		Yuxi-X	6.67 ± 0.08^c	10.00 ± 0.10^cd	27.20 ± 0.20^a	35.3 ± 0.2^c
	K326	Bozhou-B	7.10 ± 0.10^bd	10.20 ± 0.20^c	26.00 ± 0.20^c	33.4 ± 0.2^d
		Bozhou-X	6.20 ± 0.10^e	9.20 ± 0.20^e	24.50 ± 0.20^d	31.7 ± 0.3^e
		Chenzhou-B	6.60 ± 0.20^c	9.480 ± 0.08^f	24.00 ± 0.20^e	30.8 ± 0.2^f
		Zhumadian-CX	6.080 ± 0.08^e	8.40 ± 0.10^g	20.50 ± 0.20^f	26.2 ± 0.2^g
		Zimbabwe-B	7.00 ± 0.10^d	9.80 ± 0.10^df	24.04 ± 0.09^e	30.7 ± 0.2^f
Air-cured	Burley	JianShi-C	5.44 ± 0.09^f	7.61 ± 0.09^h	24.60 ± 0.10^d	33.9 ± 0.1^d

^aAll the results are in dry basis percent.

Note: Different letters in the same column indicate significantly different (p ≤ 0.05).

FIGURE 1 Moisture ratio (MR) as a function of drying time.

TABLE 3 Physicochemical characteristics and effective diffusion coefficient at different humidity of tobacco samples

		Physical characteristics		Chemical characteristics (g/100 g)						Effective diffusion coefficient × 10^14 m^2s^−1
Varieties	Samples	Specific surface area (m^2g^−1)	Specific pore volume (m^3g^−1)	Total nitrogen	Protein	Pectin	Starch	Water-soluble sugar	Total sugar	RH = 33%	RH = 43%	RH = 75%	RH = 83%
Yun 85	Chuxiong-B	0.1159	5.297	1.72 ± 0.07	4.192 ± 0.003	6.80 ± 0.20	4.30 ± 0.20	26.50 ± 0.20	39.50 ± 0.80	1.6347	2.1319	0.7950	0.7800
	Yuxi-C	0.1432	6.207	1.35 ± 0.0400	3.600 ± 0.100	10.00 ± 0.20	5.10 ± 0.20	27.70 ± 0.40	43.40 ± 0.30	1.4617	1.6175	1.3289	0.7347
	Yuxi-X	0.2170	7.541	1.44 ± 0.0200	3.000 ± 0.200	8.70 ± 0.10	4.80 ± 0.40	25.20 ± 0.10	39.10 ± 0.70	1.6408	2.1800	0.9842	0.7475
K326	Bozhou-B	0.1276	5.222	1.72 ± 0.02	3.370 ± 0.080	6.21 ± 0.09	3.70 ± 0.20	16.63 ± 0.07	31.28 ± 0.06	4.0483	5.4331	0.7569	0.6464
	Bozhou-X	0.2271	8.957	1.27 ± 0.05	3.201 ± 0.002	6.20 ± 0.20	3.60 ± 0.40	10.00 ± 0.10	22.30 ± 0.20	4.2639	6.3336	0.7572	0.6933
	Chenzhou-B	0.1259	6.927	1.85 ± 0.07	3.980 ± 0.070	10.00 ± 0.40	4.60 ± 0.10	15.00 ± 0.20	30.40 ± 0.10	2.4683	5.1114	0.9239	0.7403
	Zhumadian-CX	0.2642	9.175	1.84 ± 0.04	4.600 ± 0.100	8.80 ± 0.30	2.70 ± 0.40	4.40 ± 0.10	17.50 ± 0.40	4.2497	6.4472	0.5450	0.5153
	Zimbabwe-B	0.1398	7.849	1.61 ± 0.01	3.650 ± 0.030	6.80 ± 0.10	4.70 ± 0.02	15.00 ± 0.20	30.00 ± 1.90	3.6453	4.2200	1.3717	0.6331
Burley	JianShi-C	0.2382	13.290	3.82 ± 0.02	5.600 ± 0.200	4.80 ± 0.10	1.40 ± 0.20	0.55 ± 0.05	8.49 ± 0.07	4.7706	4.7825	0.7958	0.7150

TABLE 4 Statistical results of correlation analysis between effective diffusion coefficient and physicochemical characteristics

	Specific surface area	Specific pore volume	Total nitrogen	Protein	Pectin	Starch	Water- soluble sugar	Total sugar
Correlation coefficient	0.617	0.700**	0.335	0.267	0.733*	−0.867	−0.929*	−0.933*

* Correlation is significant at the 0.05 level.

** Correlation is significant at the 0.01 level.