according to one embodiment of the present invention , the novel milk - fermented product derived from an animal milk that undergoes fermentation of kefir grains or strains isolated from kefir grains , at least including a peptide group , wherein the peptide group comprises peaks of reference number 1 to 7 shown in any one of fig1 to fig1 . furthermore , by fermentation reaction , the big molecule proteins in the animal milk can be efficiently processed into the small fragmented peptides such as the peaks of reference number 1 to 7 shown in any one of fig1 to fig1 , and the each small fragmented peptide has never been discovered from non - fermented animal milk . according to previous studies , the strains isolated from kefir grains include lactic acid bacteria and yeasts , wherein lactic acid bacteria more include lactobacillus , lactococcus , streptococcus , leuconostoc and acetobacter , and yeasts more include saccharomyces , candida , kluyveromyces , issatchenkia , pichia and torulopsis . according to other embodiments of the present invention , the novel milk - fermented product has positive effects such as improvement of osteoporosis , prevention of bone mineral density loss and enhancement of calcium absorption . therefore , the novel milk - fermented product may be applied in organisms , and also may be obtained the peptide group such as the peaks of reference number 1 to 7 shown in any one of fig1 to fig1 by purification and isolation . the peptide group may be a food ingredient , such as a fermented milk product ; the peptide group may combine with a nutrient ingredient as a nutriment , such as a nutriment with calcium ion ; the peptide group may be with at least one medically acceptable carrier and / or excipient to be fabricated to a medical compound by any traditional method for treating osteoporosis or preventing bone mineral density loss . furthermore , the medical compound may be administered in different forms depending on the demands of oral delivery , such as granules , pills , pastille , powder , and liquid . in order to clearly describe the present invention , the following non - limiting examples with figures are provided to further illustrate the present invention . use a certain volume of animal milk as a material milk that undergoes a fermentation reaction with a certain amount of kefir grains to produce a fermented milk , which is the novel milk - fermented product disclosed in the invention . in this example , plural c57bl / 6j inbred female mice , which are purchased from national taiwan university laboratory animal center , are used . the 8 - week - old mice that have undergone ovariectomy to mimic the postmenopausal mice with osteoporosis are further separated into three groups . in addition , there is another group in which the mice have undergone surgery without removing ovaries as a sham control . in this example , the first group is the sham control with normal food supply ; the second group is the osteoporosis mice with normal food supply ; the third group is the osteoporosis mice fed with the fermented milk ; and the fourth group is the osteoporosis mice that are fed with fermented milk and additional calcium . the mice in each group are sacrificed after a certain amount of weeks , and the weekly weight changes of the mice in each group are shown in fig1 . the fermented milk and the fermented milk with additional calcium have the activities of improving osteoporosis after sacrificing the mice from each group , the trabecular bones of the growth plate around the knees are examined by micro ct and electron microscope . the ┘ g - ct scanning images and ┘ g - ct scanning 3d images of the cross section of the growth plate around the knees in each mouse group are shown in fig2 and fig3 respectively , wherein the results of the first group are shown in fig2 a and fig3 a , the results of the second group are shown in fig2 b and fig3 b , the results of the third group are shown in fig2 c and fig3 c , and the results of the fourth group are shown in fig2 d and fig3 d . the ┘ g - ct scanning images and the high magnification ┘ g - ct scanning images of the vertical section of the growth plate around the knees in each mouse group are shown in fig4 and fig5 respectively , wherein the results of the first group are shown in fig4 a and fig5 a , the results of the second group are shown in fig4 b and fig5 b , the results of the third group are shown in fig4 c and fig5 c , and the results of the fourth group are shown in fig4 d and fig5 d . the electron microscope scanning images of the vertical section of the growth plate around the knees in each mouse group are shown in fig6 , wherein the result of the first group is shown in fig6 a , the result of the second group is shown in fig6 b , the result of the third group is shown in fig6 c , and the result of the fourth group is shown in fig6 d . the results of fig2 to fig6 are further analyzed and calculated , and the statistic results , including the ratio of bone volume to total tissue volume , bone mineral density ( bmd ), trabecular number ( tb . n ) and trabecular separation / spacing ( tb . sp ), are shown in fig7 to fig1 respectively . according to the comparisons between fig2 to fig6 , the second mouse group with normal food supply shows obviously loose bone structure and a lower trabecular number compared to the first mouse group . the bone structures of the third mouse group fed with fermented milk and the fourth mouse group fed with fermented milk and additional calcium show no difference compared with the first mouse group . after further analyzing fig7 to fig1 , it more obviously shows that the ratio of bone volume to total tissue volume , the bone mineral density and the trabecular number in second group are all significantly decreased , and the trabecular separation / spacing is increased . these all indicate severe bone mineral density loss , increased bone absorption and lost bone structure in the second mouse group . in comparison with the second mouse group , the ratio of bone volume to total tissue volume , the bone mineral density and the trabecular number are all significantly increased and the trabecular separation / spacing is effectively reduced in the third mouse group fed with fermented milk and the fourth mouse group fed with fermented milk and additional calcium . these results of the third and fourth mouse groups show no difference from the first mouse group . therefore , according to this example , we know that the fermented milk and the fermented milk with additional calcium indeed improve osteoporosis and increase bone mineral density . each batch of the fermented milk from example 1 is collected and further separated by hplc with sec columns under certain conditions : the determination wave length is 215 nm , elution buffer composed of 100 mm phosphoric acid aqueous , 1m sodium chloride and 1 mm edta ph6 . 5 , and the flow rate is 0 . 5 ml / min . the separation result by hplc from each batch of the fermented milk is respectively as shown in fig1 to fig1 . after comparing fig1 to fig1 , it is found that each batch of the fermented milk can be separated into a peptide group such as the peaks of reference no . 1 to no . 7 shown in fig1 to fig1 . in other words , it is indicated that the peptide group such as the peaks of reference no . 1 to no . 7 shown in any one of fig1 to fig1 is reproducible in the fermented milk . furthermore , the retention time for the peaks of reference no . 1 to no . 7 in each of fig1 to fig1 are shown as table 1 . due to the reproducibility of the peptide group such as the peaks of reference no . 1 to no . 7 shown in fig1 to fig1 in the fermented milk , here is taken fig1 for example to compare with the hplc result of the standard protein . and the result of the comparison is shown in fig2 , wherein fig2 a and fig2 b represent fig1 and fig1 respectively . it is indicated the molecular weights of the peptides such as the peaks of reference no . 1 to no . 7 shown in fig2 are all less than 2 kd . in other words , the peptide group from the fermented milk such as the peaks of reference no . 1 to no . 7 shown in fig1 to fig1 is composed of the small fragmented peptides . the small fragmented peptides of reference no . 1 to no . 7 shown in fig1 to fig1 have anti - osteoporotic activity as shown in fig2 , a certain amount of non - fermented material milk is separated by hplc under the same conditions in example 4 . due to the reproducibility of the peptide group such as the peaks of reference no . 1 to no . 7 shown in fig1 to fig1 in the fermented milk , here is taken fig1 for example to compare with the hplc result of the material milk . and the result of the comparison between fig1 and fig2 is shown in fig2 , wherein fig2 a and fig2 b represent fig1 and fig2 respectively . moreover , as shown in fig2 , the proteins separated from the non - fermented material milk , compared to the fermented milk , are all composed of big molecules , and it doesn &# 39 ; t have any small fragmented peptides such as the peaks of reference no . 1 to no . 7 shown in fig2 a . according to the results of example 4 to example 6 , the small fragmented peptides in the fermented milk such as the peaks of reference no . 1 to no . 7 shown in fig1 to fig1 do not exist in the non - fermented milk . since the fermented milk can significantly improve osteoporosis and increase bone mineral density , it should be considered that the peptide group such as the peaks of reference no . 1 to no . 7 shown in any one of fig1 to fig1 is with anti - osteoporotic activity . the fermented milk processed by spray drying comprises the peptide group in this example , after spray drying the fermented milk , a certain amount of the powdered fermented milk is separated by hplc under the same conditions in example 4 . and the hplc chromatograph is shown in fig2 . since the peptide group such as the peaks of reference no . 1 to no . 7 shown in fig1 to fig1 is presented in the each batch of the fermented milk of example 2 , here is taken fig1 for example to compare with fig2 . and the result of the comparison between fig1 and fig2 is shown in fig2 , wherein fig2 a and fig2 b represent fig2 and fig1 respectively . as shown in fig2 , the spray dried fermented milk still contains the small fragmented peptides such as the peaks of reference no . 1 to no . 7 shown in fig1 to fig1 . in another word , it is indicated that the small fragmented peptide group will not be destroyed by process of the fermented milk . taking all examples described above together , the inventors have clearly demonstrated that the novel milk - fermented product at least having a peptide group comprising peaks of reference no . 1 to no . 7 as shown any one of in fig1 to fig1 , wherein these peptide group consists of the small fragmented peptides with anti - osteoporotic activity for not only increasing the ratio of bone volume to total tissue volume , bone mineral density and trabecular number but also decreasing trabecular separation / spacing . furthermore , it still has the above effects after adding calcium to the fermented milk . the above - mentioned specification is only for details describing the examples of the invention . thus , without departing from the spirit and the scope of the present invention , any modification or change on the embodiments of the invention or any equivalent thereof by anyone skilled in the art shall fall the protected scope of the present invention .
the present invention discloses a novel milk - fermented product comprising a group of peptides . the peptides are composed from no . 1 to no . 7 of the figure that is selected from the group consisting of fig . 11 to fig . 18 . and the novel milk - fermented product is used for suppressing the reduction of bone mineral density . therefore , the novel milk - fermented product could be a component of foods , nutrient supplement or medicine for treating or preventing osteoporosis .