不同生长期龙爪槐半乳甘露聚糖的比较研究

doi:10.3969/j.issn.0253-2417.2021.03.006

Abstract

Abstract:

The unpurified galactomannan was obtained by mechanical method. And the physical and chemical properties of galactomannan in different growth stages of Sophora japonica were studied, including the physical parameters (length, width, seed wet weight, dry weight ratio of each part), rheological properties, and contents of water-soluble and water-insoluble substances in pods. The results showed that with the continuous growth and maturity of the fruit, galactomannan accumulated in endosperm, the viscosity and water-insoluble substance of galactomannan increased gradually, while the water-soluble substance decreased gradually. With the increase of shear rate, the shear stress increased, and the apparent viscosity decreased. When the mass fraction of galactomannan gum was 0.5%, as the shear rate increased from 0 s^-1 to 85 s^-1, the viscosity of galactomannan decreased from 0.113 9 Pa·s to 0.042 Pa·s; the mass fractions of water-soluble and water-insoluble substances were 23.54% and 75.87%, respectively. With the increase of galactomannan colloid concentration, the apparent viscosity of galactomannan colloid solution increased at a certain shear rate; while with the increase of test temperature, the apparent viscosity of galactomannan colloid solution decreased gradually. In industrial production, the appropriate application conditions should be selected by comparing galactomannan with different growth periods and different physical and chemical properties.

Key words: Sophora japonica var. pendula, galactomannan, rheology, water-soluble substance, insoluble substance

CLC Number:

TQ35

Xiping FAN, Wei XU, Yingying PEI, Liwei ZHU, Jianxin JIANG. Comparative Study on Galactomannan of Sophora japonica var. pendula at Different Growth Stages[J]. Chemistry and Industry of Forest Products, 2021, 41(3): 40-46.

Figures/Tables 6

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References 28

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采摘时间/周 picking time/week	长度/cm length	宽度/cm width	含水率/% moisture content	种子湿质量/g wet weight of seed	种子内三部分质量分数¹⁾mass fraction of three parts of seed/%
采摘时间/周 picking time/week	长度/cm length	宽度/cm width	含水率/% moisture content	种子湿质量/g wet weight of seed	子叶 cotyledons	胚乳 endosperm	种皮 seed coat
15	15.3	1.10	56.37	0.5467	46.09	31.12	22.79
17	16.0	1.18	54.89	0.4704	44.70	32.76	22.54
19	15.3	1.21	48.53	0.4445	46.11	32.16	21.73
21	15.2	1.07	45.17	0.3843	46.20	32.27	21.53
23	12.3	0.92	28.69	0.2400	48.34	29.37	22.29

采摘时间/周 picking time/week	甘露聚糖/% mannan	半乳聚糖/% galactan	半乳甘露聚糖/% galactomannan	M/G值 M/G value
15	64.24±0.05	13.50±0.30	77.74±0.15	4.76
17	65.17±0.07	12.28±0.02	77.45±0.49	5.31
19	66.28±0.08	11.85±0.08	78.13±0.27	5.59
21	66.79±0.30	11.84±0.02	78.63±0.33	5.64
23	67.82±0.19	11.23±0.01	79.05±0.18	6.04

采摘时间/周 picking time/week	稠度指数(k)/(Pa·sⁿ) consistency index	流动指数(n) flow index	吻合度/% coincidence degree
15	0.171±0.002	0.87±0.01	93.4±0.10
17	0.198±0.008	0.81±0.05	95.4±0.12
19	0.467±0.005	0.76±0.06	91.7±0.09
21	0.542±0.007	0.72±0.01	92.9±0.08
23	0.584±0.006	0.71±0.01	92.5±0.21

采摘时间/周 picking time/week	水溶性物质/% water-soluble	水不溶物/% water insoluble	总质量分数/% total mass fraction
15	35.78±0.20	62.48±0.04	98.26±0.31
17	33.50±0.43	65.71±0.16	99.21±0.84
19	29.85±0.04	68.69±1.19	98.54±1.12
21	26.22±0.68	72.69±0.06	98.91±0.37
23	23.54±0.19	75.87±0.31	99.41±0.96

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Comparative Study on Galactomannan of Sophora japonica var. pendula at Different Growth Stages

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