Factors Affecting Isoflavone Content in Soybean Seeds Grown in Thailand

Table 2

Isoflavone content¹ (mg/g) in sound seeds of 14 soybean varieties planted on different dates in the same crop year at SUT Farm.

Variety	Planting date
	19 December 2009	26 December 2009	15 January 2010
Chiangmai 2	1.08±0.04	0.68±0.02^∗	0.38±0.01^∗†
Chiangmai 5	0.93±0.04	0.60±0.02^∗	0.41±0.03^∗†
Chiangmai 60	0.70±0.03	0.90±0.04^∗	0.34±0.02^∗†
Chakkrabhandhu 1	0.76±0.10	0.64±0.04	ND
KKU 35	1.65±0.09	1.22±0.02^∗	ND
Nakhon Sawan 1	1.13±0.04	1.52±0.04^∗	1.50±0.05^∗
SJ 1	1.49±0.04	1.36±0.01^∗	0.82±0.01^∗†
SJ 2	1.99±0.03	2.02±0.04	0.70±0.05^∗†
SJ 4	1.08±0.02	1.16±0.08	0.67±0.05^∗†
SJ 5	1.44±0.03	1.28±0.08^∗	0.55±0.04^∗†
Srisamrong 1	1.15±0.01	1.19±0.03^∗	0.78±0.01^∗†
Sukhothai 1	0.65±0.03	1.68±0.06^∗	0.99±0.03^∗†
Sukhothai 2	1.78±0.03	0.71±0.01^∗	0.44±0.01^∗†
Sukhothai 3	1.88±0.08	0.91±0.03^∗	1.10±0.05^∗†
Mean ± SD	1.27±0.44	1.13±0.42	0.72±0.34^∗†

Each soybean sample was extracted and assayed in triplicate (𝑛=3). Data represent mean ± standard deviation. ^∗𝑃<0.05 compared to 19 December 2009. ^†𝑃<0.05 compared to 26 December 2009. ND: not determined due to lack of soybean seed samples. ¹Isoflavone content was the summation of daidzin and genistin contents.